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WO1994025585A1 - Animaux transgeniques capables de produire des anticorps heterologues - Google Patents

Animaux transgeniques capables de produire des anticorps heterologues Download PDF

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Publication number
WO1994025585A1
WO1994025585A1 PCT/US1994/004580 US9404580W WO9425585A1 WO 1994025585 A1 WO1994025585 A1 WO 1994025585A1 US 9404580 W US9404580 W US 9404580W WO 9425585 A1 WO9425585 A1 WO 9425585A1
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WIPO (PCT)
Prior art keywords
human
heavy chain
transgene
gene
sequence
Prior art date
Application number
PCT/US1994/004580
Other languages
English (en)
Inventor
Nils Lonberg
Robert M. Kay
Original Assignee
Genpharm International, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/053,131 external-priority patent/US5661016A/en
Priority claimed from US08/096,762 external-priority patent/US5814318A/en
Application filed by Genpharm International, Inc. filed Critical Genpharm International, Inc.
Priority to JP6524481A priority Critical patent/JPH08509612A/ja
Priority to EP94916581A priority patent/EP0754225A4/fr
Priority to AU68194/94A priority patent/AU6819494A/en
Priority to CA2161351A priority patent/CA2161351C/fr
Publication of WO1994025585A1 publication Critical patent/WO1994025585A1/fr
Priority to US08/544,404 priority patent/US5770429A/en
Priority to US11/009,840 priority patent/US20060015949A1/en
Priority to US11/009,769 priority patent/US20060026703A1/en
Priority to US11/009,873 priority patent/US7501552B2/en

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    • C—CHEMISTRY; METALLURGY
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    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
    • C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
    • C12N15/85—Vectors or expression systems specially adapted for eukaryotic hosts for animal cells
    • C12N15/8509—Vectors or expression systems specially adapted for eukaryotic hosts for animal cells for producing genetically modified animals, e.g. transgenic
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K67/00—Rearing or breeding animals, not otherwise provided for; New or modified breeds of animals
    • A01K67/027—New or modified breeds of vertebrates
    • A01K67/0275—Genetically modified vertebrates, e.g. transgenic
    • A01K67/0278—Knock-in vertebrates, e.g. humanised vertebrates
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/2803—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily
    • C07K16/2812—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily against CD4
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/30—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants from tumour cells
    • C07K16/3007—Carcino-embryonic Antigens
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/42—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against immunoglobulins
    • C07K16/4283—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against immunoglobulins against an allotypic or isotypic determinant on Ig
    • C07K16/4291—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against immunoglobulins against an allotypic or isotypic determinant on Ig against IgE
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/44—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material not provided for elsewhere, e.g. haptens, metals, DNA, RNA, amino acids
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/46—Hybrid immunoglobulins
    • C07K16/461—Igs containing Ig-regions, -domains or -residues form different species
    • C07K16/462—Igs containing a variable region (Fv) from one specie and a constant region (Fc) from another
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2207/00—Modified animals
    • A01K2207/15—Humanized animals
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2217/00—Genetically modified animals
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2217/00—Genetically modified animals
    • A01K2217/05—Animals comprising random inserted nucleic acids (transgenic)
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
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    • A01K2217/00—Genetically modified animals
    • A01K2217/30—Animal model comprising expression system for selective cell killing, e.g. toxins, enzyme dependent prodrug therapy using ganciclovir
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2227/00—Animals characterised by species
    • A01K2227/10—Mammal
    • A01K2227/105—Murine
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2267/00—Animals characterised by purpose
    • A01K2267/01—Animal expressing industrially exogenous proteins
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
    • C07K2317/24—Immunoglobulins specific features characterized by taxonomic origin containing regions, domains or residues from different species, e.g. chimeric, humanized or veneered

Definitions

  • the invention relates to transgenic non-human animals capable of producing heterologous antibodies
  • transgenic animals used to produce such transgenic animals
  • transgenes capable of functionally rearranging a heterologous D gene in V-D-J recombination, immortalized B-cells capable of producing heterologous antibodies, methods and transgenes for producing heterologous antibodies of multiple isotypes, methods and transgenes for producing heterologous antibodies wherein a variable region sequence comprises somatic mutation as compared to germline rearranged variable region sequences, transgenic nonhuman animals which produce antibodies having a human primary sequence and which bind to human antigens, hybridomas made from B cells of such transgenic animals, and monclonal antibodies expressed by such hybridomas.
  • HAMA human anti-mouse antibodies
  • immunoglobulins that bind specifically with human antigens is problematic.
  • the present technology for generating monoclonal antibodies involves pre-exposing, or priming, an animal
  • idiotype and also screening for immunoglobulin class (isotype), it is possible to select hybridoma clones that secrete the desired antibody.
  • transgenic animals harboring a functional heterologous immunoglobulin transgene are a method by which antibodies reactive with self antigens may be produced.
  • antibodies reactive with self antigens may be produced.
  • transgenic animal must produce transgenic B cells that are capable of maturing through the B lymphocyte development pathway. Such maturation requires the presence of surface IgM on the transgenic B cells, however isotypes other than IgM are desired for therapeutic uses.
  • transgenes and animals harboring such transgenes that are able to undergo functional V-D-J rearrangement to generate recombinational diversity and junctional diversity.
  • transgenes and transgenic animals preferably include cis-acting sequences that are able to undergo functional V-D-J rearrangement to generate recombinational diversity and junctional diversity.
  • transgenes and transgenic animals preferably include cis-acting sequences that
  • sequences for V(D)J joining are reportedly a highly conserved, near-palindromic heptamer and a less well conserved AT-rich nanomer separated by a spacer of either 12 or 23 bp (Tonegawa (1983), Nature, 302, 575-581; Hesse, et al. (1989), Genes in Dev., 3, 1053-1061). Efficient recombination reportedly occurs only between sites containing recombination signal sequences with different length spacer regions.
  • mice [Buchini, et al. (1987), Nature, 326, 409-411 (unrearranged chicken ⁇ transgene); Goodhart, et al. (1987) , Proc. Natl. Acad. Sci. USA, 84, 4229-4233) (unrearranged rabbit ⁇ gene); and Bruggemann, et al. (1989), Proc. Natl. Acad. Sci. USA, 86, 6709-6713 (hybrid mouse-human heavy chain)].
  • the results of such experiments have been variable, in some cases, producing incomplete or minimal rearrangement of the
  • transgene a variety of biological functions of antibody molecules are exerted by the Fc portion of molecules, such as the interaction with mast cells or basophils through Fee, and binding of complement by Fc ⁇ or Fc ⁇ , it further is desirable to generate a functional diversity of antibodies of a given specificity by variation of isotype.
  • transgenic animals have been generated that incorporate transgenes encoding one or more chains of a heterologous antibody, there have been no reports of
  • heterologous transgenes that undergo successful isotype switching.
  • Transgenic animals that cannot switch isotypes are limited to producing heterologous antibodies of a single isotype, and more specifically are limited to producing an isotype that is essential for B cell maturation, such as IgM and possibly IgD, which may be of limited therapeutic utility.
  • IgM immunoglobulin
  • transgenes and transgenic animals that are capable of
  • heterologous antibodies e.g. antibodies encoded by genetic sequences of a first species that are produced in a second species. More particularly, there is a need in the art for heterologous immunoglobulin transgenes and transgenic animals that are capable of undergoing functional V-D-J gene rearrangement that incorporates all or a portion of a D gene segment which contributes to recombinational diversity. Further, there is a need in the art for transgenes and transgenic animals that can support V-D-J recombination and isotype switching so that (l) functional B cell development may occur, and (2)
  • therapeutically useful heterologous antibodies may be any therapeutically useful heterologous antibodies.
  • immunoglobulin transgene capable of functional V-D-J recombination and/or capable of isotype switching could fulfill these needs.
  • transgenic nonhuman animals which are capable of producing a heterologous antibody, such as a human antibody.
  • B-cells from such transgenic animals which are capable of expressing heterologous antibodies wherein such B-cells are immortalized to provide a source of a monoclonal antibody specific for a particular antigen.
  • a further object of the invention is to provide methods to generate an immunoglobulin variable region gene segment repertoire that is used to construct one or more transgenes of the invention.
  • Transgenic nonhuman animals are provided which are capable of producing a heterologous antibody, such as a human antibody.
  • heterologous antibodies may be of various isotypes, including: IgG1, IgG2, lgG3, IgG4, IgM, IgA1, IgA2, IgA sec , IgD, of IgE.
  • IgG1, IgG2, lgG3, IgG4, IgM, IgA1, IgA2, IgA sec , IgD, of IgE In order for such transgenic nonhuman animals to make an immune response, it is necessary for the transgenic B cells and pre-B cells to produce surface-bound immunoglobulin, particularly of the IgM (or possibly IgD) isotype, in order to effectuate B cell development and
  • a cell of the B-cell lineage will produce only a single isotype at a time, although cis or trans
  • RNA splicing such as occurs naturally with the ⁇ s (secreted ⁇ ) and ⁇ M (membrane-bound ⁇ ) forms, and the ⁇ and ⁇ immunoglobulin chains, may lead to the contemporaneous
  • isotype switching may be classical classswitching or may result from one or more non-classical isotype switching mechanisms.
  • the invention provides heterologous immunoglobulin transgenes and transgenic nonhuman animals harboring such transgenes, wherein the transgenic animal is capable of producing heterologous antibodies of multiple isotypes by undergoing isotype switching.
  • Classical isotype switching occurs by recombination events which involve at least one switch sequence region in the transgene.
  • Non-classical isotype switching may occur by, for example, homologous recombination between human ⁇ and human ⁇ sequences ( ⁇ -associated deletion).
  • Alternative non-classical switching mechanisms such as intertransgene and/or interchromosomal recombination, among others, may occur and effectuate isotype switching.
  • transgenic nonhuman animals produce a first immunoglobulin isotype that is necessary for antigen-stimulated B cell maturation and can switch to encode and produce one or more subsequent heterologous isotypes that have therapeutic and/or diagnostic utility.
  • Transgenic nonhuman animals of the invention are thus able to produce, in one embodiment, IgG, IgA, and/or IgE antibodies that are encoded by human immunoglobulin genetic sequences and which also bind specific human antigens with high affinity.
  • the invention also encompasses B-cells from such transgenic animals that are capable of expressing heterologous antibodies of various isotypes, wherein such B-cells are immortalized to provide a source of a monoclonal antibody specific for a particular antigen.
  • Hybridoma cells that are derived from such B-cells can serve as one source of such heterologous monoclonal antibodies.
  • the invention provides heterologous unrearranged and rearranged immunoglobulin heavy and light chain transgenes capable of undergoing isotype switching in vivo in the
  • isotype switching may occur spontaneously or be induced by treatment of the transgenic animal or explanted B-lineage lymphocytes with agents that promote isotype
  • T-cell-derived lymphokines e.g., IL-4 and IFN ⁇
  • the invention includes methods to induce heterologous antibody production in the aforementioned transgenic non-human animal, wherein such antibodies may be of various isotypes.
  • These methods include producing an antigen-stimulated immune response in a transgenic nonhuman animal for the generation of heterologous antibodies, particularly heterologous antibodies of a switched isotype (i.e., IgG, IgA, and IgE).
  • heterologous immunoglobulins produced in the transgenic animal and monoclonal antibody clones derived from the B-cells of said animal may be of various isotypes.
  • Switch regions may be grafted from various C H genes and ligated to other C H genes in a transgene construct; such grafted switch sequences will typically function independently of the
  • ⁇ -associated deletion sequences may be linked to various C H genes to effect non-classical switching by deletion of sequences between two ⁇ -associated deletion sequences.
  • a transgene may be constructed so that a particular C H gene is linked to a different switch sequence and thereby is switched to more frequently than occurs when the naturally associated switch region is used.
  • This invention also provides methods to determine whether isotype switching of transgene sequences has occurred in a transgenic animal containing an immunoglobulin transgene.
  • the invention provides immunoglobulin transgene constructs and methods for producing immunoglobulin transgene constructs, some of which contain a subset of germline
  • immunoglobulin loci sequences (which may include deletions).
  • the invention includes a specific method for facilitated cloning and construction of immunoglobulin transgenes,
  • restriction sites flanked by two unique NotI sites. This method exploits the complementary termini of XhoI and SalI restrictions sites and is useful for creating large constructs by ordered concatemerization of restriction fragments in a vector.
  • the transgenes of the invention include a heavy chain transgene comprising DNA encoding at least one variable gene segment, one diversity gene segment, one joining gene segment and one constant region gene segment.
  • immunoglobulin light chain transgene comprises DNA encoding at least one variable gene segment, one joining gene segment and one constant region gene segment.
  • the gene segments encoding the light and heavy chain gene segments are heterologous to the transgenic non-human animal in that they are derived from, or correspond to, DNA encoding immunoglobulin heavy and light chain gene segments from a species not consisting of the transgenic non-human animal.
  • the transgene is constructed such that the individual gene segments are unrearranged, i.e., not rearranged so as to encode a functional immunoglobulin light or heavy chain.
  • Such unrearranged transgenes permit recombination of the gene segments (functional rearrangement) and expression of the resultant rearranged immunoglobulin heavy and/or light chains within the transgenic non-human animal when said animal is exposed to antigen.
  • heterologous heavy and light immunoglobulin transgenes comprise relatively large fragments of unrearranged heterologous DNA. Such fragments typically comprise a substantial portion of the C, J (and in the case of heavy chain, D) segments from a heterologous immunoglobulin locus. In addition, such fragments also comprise a substantial portion of the variable gene segments.
  • regulatory sequences e.g. promoters, enhancers, class switch regions, recombination signals and the like, corresponding to sequences derived from the heterologous DNA.
  • regulatory sequences may be incorporated into the transgene from the same or a related species of the non-human animal used in the invention.
  • human immunoglobulin gene segments may be combined in a transgene with a rodent immunoglobulin enhancer sequence for use in a transgenic mouse.
  • a transgenic non-human animal containing germline unrearranged light and heavy immunoglobulin transgenes - that undergo VDJ joining during D-cell differentiation - is contacted with an antigen to induce production of a heterologous antibody in a secondary repertoire B-cell.
  • vectors and methods to disrupt the endogenous immunoglobulin loci in the non-human animal to be used in the invention utilize a transgene, preferably positive-negative selection vector, which is constructed such that it targets the functional disruption of a class of gene segments encoding a heavy and/or light immunoglobulin chain endogenous to the non-human animal used in the invention.
  • Such endogenous gene segments include diversity, joining and constant region gene segments.
  • positive-negative selection vector is contacted with at least one embryonic stem cell of a non-human animal after which cells are selected wherein the positive-negative selection vector has integrated into the genome of the non-human animal by way of homologous recombination.
  • the resultant transgenic non-human animal is substantially incapable of mounting an immunoglobulin-mediated immune response as a result of homologous integration of the vector into chromosomal DNA.
  • immune deficient non-human animals may thereafter be used for study of immune deficiencies or used as the recipient of heterologous immunoglobulin heavy and light chain transgenes.
  • the invention also provides vectors, methods, and compositions useful for suppressing the expression of one or more species of immunoglobulin chain(s), without disrupting an endogenous immunoglobulin locus. Such methods are useful for suppressing expression of one or more endogenous immunoglobulin chain(s), without disrupting an endogenous immunoglobulin locus. Such methods are useful for suppressing expression of one or more endogenous immunoglobulin chain(s), without disrupting an endogenous immunoglobulin locus. Such methods are useful for suppressing expression of one or more endogenous
  • immunoglobulin chains while permitting the expression of one or more transgene-encoded immunoglobulin chains.
  • suppression of immunoglobulin chain expression does not require the time-consuming breeding that is needed to
  • Ig chain suppression may be accomplished with: (1) transgenes encoding and expressing antisense RNA that specifically hybridizes to an endogenous Ig chain gene sequence, (2) antisense oligonucleotides that specifically hybridize to an endogenous Ig chain gene
  • immunoglobulins that bind specifically to an endogenous Ig chain polypeptide.
  • the invention provides transgenic non-human animals comprising: a homozygous pair of functionally disrupted endogenous heavy chain alleles, a homozygous pair of
  • immunoglobulin heavy chain transgene wherein said animal makes an antibody response following immunization with an antigen, such as a human antigen (e.g., CD4).
  • an antigen such as a human antigen (e.g., CD4).
  • the invention also provides such a transgenic non-human animal wherein said functionally disrupted endogenous heavy chain allele is a J H region homologous recombination knockout, said functionally disrupted endogenous light chain allele is a J ⁇ region
  • immunoglobulin heavy chain transgene is the HC1 or HC2 human minigene transgene
  • said heterologous light chain transgene is the KC2 or KC1e human ⁇ transgene
  • said antigen is a human antigen
  • the invention also provides various embodiments for suppressing, ablating, and/or functionally disrupting the endogenous nonhuman immunoglobulin loci.
  • the invention also provides transgenic mice expressing both human sequence heavy chains and chimeric heavy chains comprising a human sequence heavy chain variable region and a murine sequence heavy chain constant region.
  • Such chimeric heavy chains are generally produced by transswitching between a functionally rearranged human transgene and an endogenous murine heavy chain constant region (e.g., ⁇ 1, ⁇ 2a, ⁇ 2b, ⁇ 3).
  • Antibodies comprising such chimeric heavy chains typically in combination with a transgene-encoded human sequence light chain or endogenous murine light chain, are formed in response to immunization with a predetermined antigen.
  • the transgenic mice of these embodiments can comprise B cells which produce (express) a human sequence heavy chain at a first timepoint and trans-switch to produce (express) a chimeric heavy chain composed of a human variable region and a murine constant region (e.g., ⁇ 1, ⁇ 2a, ⁇ 2b, ⁇ 3) at a second (subsequent) timepoint; such human sequence and chimeric heavy chains are incorporated into functional
  • the transgenic mice of these embodiments can comprise B cells which express a human sequence heavy chain and subsequently switch (via trans-switching or cis-switching) to express a chimeric or isotype-switched heavy chain composed of a human variable region and a alternative constant region (e.g., murine ⁇ 1, ⁇ 2a, ⁇ 2b, ⁇ 3; human ⁇ , ⁇ , ⁇ ); such human sequence and chimeric or isotype-switched heavy chains are incorporated into functional antibodies with light chains (human or mouse); such antibodies are present in the serum of such transgenic mice.
  • a human sequence heavy chain and subsequently switch (via trans-switching or cis-switching) to express a chimeric or isotype-switched heavy chain composed of a human variable region and a alternative constant region (e.g., murine ⁇ 1, ⁇ 2a, ⁇ 2b, ⁇ 3; human ⁇ , ⁇ , ⁇ ); such human sequence and chimeric or isotype-
  • Fig. 1 depicts the complementarity determining regions CDR1, CDR2 and CDR3 and framework regions FR1, FR2, FR3 and FR4 in unrearranged genomic DNA and mRNA expressed from a rearranged immunoglobulin heavy chain gene
  • Fig. 2 depicts the human ⁇ chain locus.
  • Fig. 3 depicts the human ⁇ chain locus
  • Fig. 4 depicts the human heavy chain locus
  • Fig. 5 depicts a transgene construct containing a rearranged IgM gene ligated to a 25 kb fragment that contains human ⁇ 3 and ⁇ 1 constant regions followed by a 700 bp fragment containing the rat chain 3' enhancer sequence.
  • Fig. 6 is a restriction map of the human ⁇ chain locus depicting the fragments to be used to form a light chain transgene by way of in vivo homologous recombination.
  • Fig. 7 depicts the construction of pGP1.
  • Fig. 8 depicts the construction of the polylinker contained in pGP1.
  • Fig. 9 depicts the fragments used to construct a human heavy chain transgene of the invention.
  • Fig. 10 depicts the construction of pHIG1 and pCON1.
  • Fig. 11 depicts the human C ⁇ 1 fragments which are inserted into pRE3 (rat enhancer 3') to form pREG2.
  • Fig. 12 depicts the construction of pHIG3' and PCON.
  • Fig. 13 depicts the fragment containing human D region segments used in construction of the transgenes of the invention.
  • Fig. 14 depicts the construction of pHIG2 (D segment containing plasmid).
  • Fig. 15 depicts the fragments covering the human J ⁇ and human C ⁇ gene segments used in constructing a transgene of the invention.
  • Fig. 16 depicts the structure of pE ⁇ .
  • Fig. 17 depicts the construction of pKapH.
  • Figs. 18A through 18D depict the construction of a positive-negative selection vector for functionally disrupting the endogenous heavy chain immunoglobulin locus of mouse.
  • Figs. 19A through 19C depict the construction of a positive-negative selection vector for functionally disrupting the endogenous immunoglobulin light chain loci in mouse.
  • Figs. 20A through 20E depict the structure of a kappa light chain targeting vector.
  • Figs. 21A through 21F depict the structure of a mouse heavy chain targeting vector.
  • Fig. 22 depicts the map of vector pGPe.
  • Fig. 23 depicts the structure of vector pJM2.
  • Fig. 24 depicts the structure of vector pCOR1.
  • Fig. 25 depicts the transgene constructs for pIGM1, pHC1 and pHC2.
  • Fig. 26 depicts the structure of P ⁇ e2.
  • Fig. 27 depicts the structure of pVGE1.
  • Fig. 28 depicts the assay results of human Ig expression in a pHC1 transgenic mouse.
  • Fig. 29 depicts the structure of pJCK1.
  • Fig. 30 depicts the construction of a synthetic heavy chain variable region.
  • Fig. 31 is a schematic representation of the heavy chain minilocus constructs pIGM 1 , pHC1, and pHC2.
  • Fig. 32 is a schematic representation of the heavy chain minilocus construct pIGG1 and the ⁇ light chain
  • Fig. 33 depicts a scheme to reconstruct functionally rearranged light chain genes.
  • Fig. 34 depicts serum ELISA results
  • Fig. 35 depicts the results of an ELISA assay of serum from 8 transgenic mice.
  • Fig. 36 is a schematic representation of plasmid pBCE1.
  • Figs. 37A-37C depict the immune response of transgenic mice of the present invention against KLH-DNP, by measuring IgG and IgM levels specific for KLH-DNP (37A), KLH (37B) and BSA-DNP (37C).
  • Fig. 38 shows ELISA data demonstrating the presence of antibodies that bind human carcinoembryonic antigen (CEA) and comprise human ⁇ chains; each panel shows reciprocal serial dilutions from pooled serum samples obtained from mice on the indicated day following immunization.
  • CEA carcinoembryonic antigen
  • Fig. 39 shows ELISA data demonstrating the presence of antibodies that bind human carcinoembryonic antigen (CEA) and comprise human ⁇ chains; each panel shows reciprocal serial dilutions from pooled serum samples obtained from mice on the indicated day following immunization.
  • CEA carcinoembryonic antigen
  • Fig. 40 shows aligned variable region sequences of 23 randomly-chosen cDNAs generated from mRNA obtained from lymphoid tissue of HC1 transgenic mice immunized with human carcinoembryonic antigen (CEA) as compared to the germline transgene sequence (top line); on each line nucleotide changes relative to germline sequence are shown above the alteration in deduced amino acid sequence (if any); the regions
  • Non-germline encoded nucleotides are shown in capital letters.
  • Germline V H 251 and J H are shown in lower case letters.
  • Deduced amino acid changes are given beneath
  • Fig. 41 show the nucleotide sequence of a human DNA fragment, designated vk65.3, containing a V ⁇ gene segment; the deduced amino acid sequences of the V ⁇ coding regions are also shown; splicing and recombination signal sequences
  • Fig. 42 show the nucleotide sequence of a human DNA fragment, designated vk65.5, containing a V ⁇ gene segment; the deduced amino acid sequences of the V ⁇ coding regions are also shown; splicing and recombination signal sequences
  • Fig. 43 show the nucleotide sequence of a human DNA fragment, designated vk65.8, containing a V ⁇ gene segment; the deduced amino acid sequences of the V ⁇ coding regions are also shown; splicing and recombination signal sequences
  • Fig. 44 show the nucleotide sequence of a human DNA fragment, designated vk65.15, containing a V ⁇ gene segment; the deduced amino acid sequences of the V ⁇ coding regions are also shown; splicing and recombination signal sequences
  • Fig. 45 shows formation of a light chain minilocus by homologous recombination between two overlapping fragments which were co-injected.
  • Fig. 46 shows ELISA results for monoclonal antibodies reactive with CEA and non-CEA antigens showing the specificity of antigen binding.
  • Fig. 47 shows the DNA sequences of 10 cDNAs amplified by PCR to amplify transcripts having a human VDJ and a murine constant region sequence.
  • Fig. 48 shows ELISA results for various dilutions of serum obtained from mice bearing both a human heavy chain minilocus transgene and a human ⁇ minilocus transgene; the mouse was immunized with human CD4 and the data shown
  • Fig. 49 shows relative distribution of lymphocytes staining for human ⁇ or mouse ⁇ as determined by FACS for three mouse genotypes.
  • Fig. 50 shows relative distribution of lymphocytes staining for human ⁇ or mouse ⁇ as determined by FACS for three mouse genotypes.
  • Fig. 51 shows relative distribution of lymphocytes staining for mouse ⁇ as determined by FACS for three mouse genotypes.
  • Fig. 52 shows relative distribution of lymphocytes staining for mouse ⁇ or human ⁇ as determined by FACS for four mouse genotypes.
  • Fig. 53 shows the amounts of human ⁇ , human ⁇ , human ⁇ , mouse ⁇ , mouse ⁇ , mouse ⁇ , and mouse ⁇ chains in the serum of unimmunized 0011 mice.
  • Fig. 54 shows a scatter plot showing the amounts of human ⁇ , human ⁇ , human ⁇ , mouse ⁇ , mouse y, mouse ⁇ , and mouse ⁇ chains in the serum of unimmunized 0011 mice of various genotypes.
  • Fig. 55 shows the titres of antibodies comprising human ⁇ , human ⁇ , or human ⁇ chains in anti-CD4 antibodies in the serum taken at three weeks or seven weeks post-immunization following immunization of a 0011 mouse with human CD4.
  • Fig. 56 shows a schematic representation of the human heavy chain minilocus transgenes pHC1 and pHC2, and the light chain minilocus transgenes pKC1, pKC1e, and the light chain minilocus transgene created by homologous recombination between pKC2 and Co4 at the site indicated.
  • Fig. 57 shows a linkage map of the murine lambda light chain locus as taken from Storb et al. (1989) op.cit.; the stippled boxes represent a pseudogene.
  • Fig. 58 shows a schematic representation of
  • Fig. 59 schematically shows the structure of a homologous recombination targeting transgene for deleting genes, such as heavy chain constant region genes.
  • Fig. 60 shows a map of the BALB/c murine heavy chain locus as taken from Immunoglobulin Genes, Honjo, T, Alt, FW, and Rabbits TH (eds.) Academic Press, NY (1989) p. 129.
  • Structural genes are shown by closed boxes in the top line; second and third lines show restriction sites with symbols indicated.
  • Fig. 61 shows a nucleotide sequence of mouse heavy chain locus ⁇ constant region gene.
  • Fig. 62 shows the construction of a frameshift vector (plasmid B) for introducing a two bp frameshift into the murine heavy chain locus J 4 gene.
  • Fig. 63 shows isotype specific response of transgenic animals during hyperimmunization. The relative levels of reactive human ⁇ and ⁇ 1 are indicated by a
  • Fig. 64A and 64B show expression of transgene encoded ⁇ 1 isotype mediated by class switch recombination.
  • FIG. 64A shows a Southern blot of PacI/SfiI digested DNA isolated from three transgene expressing hybridomas. From left to right: clone 92-09A-5H1-5, human ⁇ 1 + / ⁇ -; clone 92-90A-4G2-2, human ⁇ 1 + / ⁇ -; clone 92-09A-4F7-A5-2, human ⁇ 1-, ⁇ + . All three hybridomas are derived from a ⁇ month old male mouse
  • Fig. 64B is a diagram of two possible deletional mechanisms by which a class switch from ⁇ to ⁇ 1 can occur.
  • the human ⁇ gene is flanked by 400 bp direct repeats ( ⁇ and ⁇ ) which can recombine to delete ⁇ . Class switching by this mechanism will always generate a 6.4 kb PacI/SfiI fragment, while class switching by recombination between the ⁇ and the ⁇ 1 switch regions will generate a PacI/Sfil fragment between 4 and ⁇ kb, with size variation between individual switch events.
  • the two ⁇ 1 expressing hybridomas examined in Fig. 64A appear to have undergone recombination between the ⁇ and ⁇ 1 switch regions.
  • Fig. 65 shows chimeric human/mouse immunoglobulin heavy chains generated by trans-switching.
  • cDNA clones of trans-switch products were generated by reverse transcription and PCR amplification of a mixture of spleen and lymph node RNA isolated from a hyperimmunized HC1 transgenic-JHD mouse (#2357; see legend to Fig. 63 for description of animal and immunization schedule).
  • the partial nucleotide sequence of 10 randomly picked clones is shown. Lower case letters indicate germline encoded, capital letters indicate nucleotides that cannot be assigned to known germline sequences; these may be somatic mutations, N nucleotides, or truncated D segments. Both face type indicates mouse ⁇ sequences.
  • Figs. 66A and 66B show that the rearranged VH251 transgene undergoes somatic mutation in a hyperimmunized.
  • sequence is shown at the top; nucleotide changes from germline are given for each clone. A period indicates identity with germline sequence, capital letters indicate no identified germline origin. The sequences are grouped according to J segment usage. The germline sequence of each of the J segments if shown. Lower case letters within CDR3 sequences indicate identity to known D segment included in the HC1 transgene. The assigned D segments are indicated at the end of each sequence. Unassigned sequences could be derived from N region addition or somatic mutation; or in some cases they are simply too short to distinguish random N nucleotides from known D segments.
  • Fig. 66A primary response 13 randomly picked VH251- ⁇ 1 cDNA clones.
  • a 4 week old female HC1 line 26-JHD mouse (#2599) was given a single injection of KLH and complete Freunds adjuvant; spleen cell RNA was isolated 5 days later.
  • the overall frequency of somatic mutations within the V segment is 0.06% (2/3,198 bp).
  • Fig. 66B secondary response 13 randomly picked VH251- ⁇ 1 cDNA clones.
  • a 2 month old female HC1 line 26-JHD mouse (#3204) was given 3 injections of HEL and Freunds adjuvant over one month (a primary injection with complete adjuvant and boosts with incomplete at one week and 3 weeks); spleen and lymph node RNA was isolated 4 months later.
  • the overall frequency of somatic mutations within the V segment is 1.6% (52/3,198 bp).
  • Figs. 67A and 67B show that extensive somatic mutation is confined to ⁇ 1 sequences: somatic mutation and class switching occur within the same population of B cells.
  • Fig. 67A IgM: 23 randomly picked VH251- ⁇ cDNA clones. Nucleotide sequence of 156 bp segment including CDRs 1 and 2 surrounding residues. The overall level of somatic mutation is 0.1% (5/3,744 bp).
  • Fig 67B IgG: 23 randomly picked VH251- ⁇ I cDNA clones. Nucleotide sequence of segment including CDRs 1 through 3 and surrounding
  • Fig. 68 indicates that VH51P1 and VH56P1 show extensive somatic mutation of in an unimmunized mouse.
  • the overall frequency of somatic mutation with the 19 VH56p1 segments is 2.2%
  • Double transgenic mice with disrupted endogenous Ig loci contain human IgM/c positive B cells. FACS of cells isolated from spleens of 4 mice with different genotypes.
  • Left column control mouse (#9944, 6 wk old female JH+/-, JC ⁇ +/- ; heterozygous wild-type mouse heavy and ⁇ -light chain loci, non-transgenic).
  • Second column human heavy chain transgenic (#9877, 6 wk old female JH-/-, JC ⁇ -/-, HC2 line 2550 +; homozygous for disrupted mouse heavy and ⁇ -light chain loci, hemizygous for HC2 transgene).
  • Third column human ⁇ -light chain transgenic (#9878, 6 wk old female JH-/-, JC ⁇ -/-, KCo4 line 4437 +; homozygous for
  • Second row spleen cells stained for expression of human ⁇ heavy chain (x-axis) and human ⁇ light chain (y-axis).
  • Third row spleen cells stained for expression of mouse ⁇ heavy chain (x-axis) and mouse ⁇ light chain (y-axis).
  • Bottom row histogram of spleen cells stained for expression of mouse B220 antigen (log fluorescence: x-axis; cell number: y-axis).
  • Fig. 70 Secreted immunoglobulin levels in the serum of double transgenic mice. Human ⁇ , ⁇ , and ⁇ , and mouse ⁇ and ⁇ from 18 individual HC2/KCo4 double transgenic mice homozygous for endogenous heavy and ⁇ -light chain locus disruption. Mice: (+) HC2 line 2550 (-5 copies of HC2 per integration), KCo4 line 4436 (1-2 copies of KCo4 per
  • HC2 line 2550, KCo4 line 4437 (-10 copies of KCo4 per integration);
  • HC2 line 2550, KCo4 line 4583 (-5 copies of KCo4 per integration);
  • D HC2 line 2572 (30-50 copies of HC2 per integration, KCo4 line 4437;
  • ⁇ HC2 line 5467 (20-30 copies of HC2 per integration, KCo4 line 4437.
  • Figs. 71A and 71B show human antibody responses to human antigens.
  • Fig. 71A Primary response to recombinant human soluble CD4. Levels of human IgM and human ⁇ light chain are reported for prebleed (0) and post-immunization (•) serum from four double transgenic mice.
  • Fig. 71B Switching to human IgG occurs in vivo . Human IgG (circles) was detected with peroxidase conjugated polyclonal anti-human IgG used in the presence of 1.5 ⁇ /ml excess IgE, ⁇ and 1% normal mouse serum to inhibit non-specific cross-reactivity.
  • Fig. 72 shows FACS analysis of human PBL with a hybridoma supernatant that discriminates human CD4+
  • lymphocytes from human CD8+ lymphocytes from human CD8+ lymphocytes.
  • Fig. 73 shows human ⁇ -CD4 IgM anf IgG in transgenic mouse serum.
  • Fig. 74 shows competition binding experiments comparing a transgenic mouse ⁇ -human CD4 hybridoma monoclonal, 2C11-8, to the RPA-TA and Leu-3A monoclonals.
  • Fig. 75 shows production data for Ig expression of cultured 2C11-8 hybridoma.
  • Table 1 depicts the sequence of vector pGPe.
  • Table 2 depicts the sequence of gene V H 49.8.
  • Table 3 depicts the detection of human IgM and IgG in the serum of transgenic mice of this invention.
  • Table 4 depicts sequences of VDJ joints.
  • Table 5 depicts the distribution of J segments incorporated into pHC1 transgene encoded transcripts to J segments found in adult human peripheral blood lymphocytes (PBL).
  • Table 6 depicts the distribution of D segments incorporated into pHC1 transgene encoded transcripts to D segments found in adult human peripheral blood lymphocytes (PBL).
  • Table 7 depicts the length of the CDR3 peptides from transcripts with in-frame VDJ joints in the pHC1 transgenic mouse and in human PBL.
  • Table 8 depicts the predicted amino acid sequences of the VDJ regions from 30 clones analyzed from a pHC1
  • Table 9 shows transgenic mice of line 112 that were used in the indicated experiments; (+) indicates the presence of the respective transgene, (++) indicates that the animal is homozygous for the J H D knockout transgene.
  • Table 10 shows the genotypes of several 0011 mice.
  • Table 11 shows transgene V and J segment usage.
  • Table 12 shows the occurrence of somatic mutation in the HC2 heavy chain transgene in transgenic mice.
  • the immunized animal that serves as the source of B cells must make an immune response against the presented antigen.
  • the antigen presented In order for an animal to make an immune response, the antigen presented must be foreign and the animal must not be tolerant to the antigen.
  • self-tolerance will prevent an immunized human from making a substantial immune response to the human protein, since the only epitopes of the antigen that may be immunogenic will be those that result from polymorphism of the protein within the human population
  • One methodology that can be used to obtain human antibodies that are specifically reactive with human antigens is the production of a transgenic mouse harboring the human immunoglobulin transgene constructs of this invention.
  • transgenes containing all or portions of the human immunoglobulin heavy and light chain loci or transgenes containing synthetic "miniloci" (described infra , and in copending applications U.S.S.N. 07/990,860, filed 16 December 1992, U.S.S.N. 07/810,279 filed 17 December 1991, U.S.S.N. 07/904,068 filed 23 June 1992; U.S.S.N. 0 ⁇ /853,408, filed 18 March 1992, U.S.S.N. 0 ⁇ /5 ⁇ 4, ⁇ 48 filed August 29, 1990,
  • transgenic nonhuman animal Such a transgenic nonhuman animal will have the capacity to produce immunoglobulin chains that are encoded by human immunoglobulin genes, and additionally will be capable of making an immune response against human antigens.
  • transgenic animals can serve as a source of immune sera reactive with specified human antigens, and B-cells from such transgenic animals can be fused with myeloma cells to produce hybridomas that secrete monoclonal antibodies that are encoded by human immunoglobulin genes and which are specifically reactive with human antigens.
  • transgenic mice containing various forms of immunoglobulin genes has been reported previously.
  • Rearranged mouse immunoglobulin heavy or light chain genes have been used to produce transgenic mice.
  • functionally rearranged human Ig genes including the ⁇ or ⁇ 1 constant region have been expressed in transgenic mice.
  • V-D-J or V-J not rearranged immunoglobulin genes have been variable, in some cases, producing incomplete or minimal rearrangement of the transgene.
  • immunoglobulin transgenes which undergo successful isotype switching between C H genes within a transgene.
  • the invention also provides a method for identifying candidate hybridomas which secrete a monoclonal antibody comprising a human immunoglobulin chain consisting essentially of a human VDJ sequence in polypeptide linkage to a human constant region sequence.
  • candidate hybridomas are identified from a pool of hybridoma clones comprising: (1) hybridoma clones that express immunoglobulin chains consisting essentially of a human VDJ region and a human constant region, and (2) trans-switched hybridomas that express heterohybrid immunoglobulin chains consisting essentially of a human VDJ region and a murine constant region.
  • the supernatant(s) of individual or pooled hybridoma clones is contacted with a predetermined antigen, typically an antigen which is
  • a solid substrate e.g., a microtitre well
  • An antibody that specifically binds to human constant regions is also contacted with the hybridoma supernatant and predetermined antigen under binding conditions so that the antibody selectively binds to at least one human constant region epitope but substantially does not bind to murine constant region epitopes; thus forming complexes consisting essentially of hybridoma supernatant (transgenic monoclonal antibody) bound to a predetermined antigen and to an antibody that specifically binds human constant regions (and which may be labeled with a detectable label or
  • antibody refers to a glycoprotein comprising at least two light polypeptide chains and two heavy polypeptide chains. Each of the heavy and light polypeptide chains contains a variable region (generally the amino terminal portion of the polypeptide chain) which
  • Each of the heavy and light polypeptide chains also comprises a constant region of the polypeptide chains (generally the carboxyl terminal portion) which may mediate the binding of the immunoglobulin to host tissues or factors including various cells of the immune system, some phagocytic cells and the first component (C1q) of the classical complement system.
  • a heterologous antibody is defined in relation to the transgenic non-human organism producing such an antibody. It is defined as an antibody having an amino acid sequence or an encoding DNA sequence corresponding to that found in an organism not consisting of the transgenic non-human animal, and generally from a species other than that of the transgenic non-human animal.
  • hybrid antibody refers to an antibody having a light and heavy chains of different organismal origins.
  • an antibody having a human heavy chain associated with a murine light chain is a
  • heterohybrid antibody refers to the antibody class (e.g., IgM or IgG 1 ) that is encoded by heavy chain constant region genes.
  • isotype switching refers to the phenomenon by which the class, or isotype, of an antibody changes from one Ig class to one of the other Ig classes.
  • nonswitched isotype refers to the isotypic class of heavy chain that is produced when no isotype switching has taken place; the C H gene encoding the
  • nonswitched isotype is typically the first C H gene immediately downstream from the functionally rearranged VDJ gene.
  • switch sequence refers to those DNA sequences responsible for switch recombination.
  • a "switch donor” sequence typically a ⁇ switch region, will be 5' (i.e., upstream) of the construct region to be deleted during the switch recombination.
  • the "switch acceptor” region will be between the construct region to be deleted and the replacement constant region (e.g., ⁇ , e, etc.). As there is no specific site where recombination always occurs, the final gene sequence will typically not be predictable from the construct.
  • glycosylation pattern is defined as the pattern of carbohydrate units that are covalently attached to a protein, more specifically to an immunoglobulin protein.
  • a glycosylation pattern of a heterologous antibody can be characterized as being substantially similar to
  • glycosylation patterns which occur naturally on antibodies produced by the species of the nonhuman transgenic animal, when one of ordinary skill in the art would recognize the glycosylation pattern of the heterologous antibody as being more similar to said pattern of glycosylation in the species of the nonhuman transgenic animal than to the species from which the C H genes of the transgene were derived.
  • telomere binding refers to the property of the antibody: (1) to bind to a predetermined antigen with an affinity of at least 1 ⁇ 10 7 M -1 , and (2) to preferentially bind to the predetermined antigen with an affinity that is at least two-fold greater than its affinity for binding to a non-specific antigen (e.g., BSA, casein) other than the predetermined antigen or a closely-related antigen.
  • a non-specific antigen e.g., BSA, casein
  • naturally-occurring refers to the fact that an object can be found in nature.
  • a polypeptide or polynucleotide sequence that is present in an organism (including viruses) that can be isolated from a source in nature and which has not been intentionally modified by man in the laboratory is naturally-occurring.
  • rearranged refers to a configuration of a heavy chain or light chain immunoglobulin locus wherein a V segment is positioned immediately adjacent to a D-J or J segment in a conformation encoding essentially a complete V H or V L domain, respectively.
  • immunoglobulin gene locus can be identified by comparison to germline DNA; a rearranged locus will have at least one recombined heptamer/nonamer homology element.
  • V segment configuration refers to the configuration wherein the V segment is not recombined so as to be immediately adjacent to a D or J segment.
  • nucleic acids For nucleic acids, the term "substantial homology" indicates that two nucleic acids, or designated sequences thereof, when optimally aligned and compared, are identical, with appropriate nucleotide insertions or deletions, in at least about 80% of the nucleotides, usually at least about 90% to 95%, and more preferably at least about 98 to 99.5% of the nucleotides. Alternatively, substantial homology exists when the segments will hybridize under selective hybridization conditions, to the complement of the strand.
  • the nucleic acids may be present in whole cells, in a cell lysate, or in a partially purified or substantially pure form.
  • a nucleic acid is "isolated” or “rendered substantially pure” when purified away from other cellular components or other contaminants, e.g. , other cellular nucleic acids or proteins, by standard techniques, including alkaline/SDS treatment, CsCl banding, column chromatography, agarose gel electrophoresis and others well known in the art. See. F. Ausubel, et al., ed. Current Protocols in Molecular Biology, Greene Publishing and Wiley-Interscience, New York (198 ⁇ ).
  • nucleic acid compositions of the present invention while often in a native sequence (except for modified restriction sites and the like), from either cDNA, genomic or mixtures may be mutated, thereof in accordance with standard techniques to provide gene sequences. For coding sequences, these mutations, may affect amino acid sequence as desired.
  • DNA sequences substantially
  • a nucleic acid is "operably linked" when it is placed into a functional relationship with another nucleic acid sequence.
  • a promoter or enhancer is operably linked to a coding sequence if it affects the
  • operably linked means that the DNA sequences being linked are contiguous and, where necessary to join two protein coding regions, contiguous and in reading frame.
  • operably linked indicates that the sequences are capable of effecting switch recombination.
  • the transgenes of the invention are constructed so as to produce isotype switching and one or more of the following: (1) high level and cell-type specific expression,
  • the transgene need not activate allelic exclusion.
  • the transgene comprises a
  • transgenic non-human animals contain rearranged, unrearranged or a combination of rearranged and unrearranged heterologous immunoglobulin heavy and light chain transgenes in the
  • Each of the heavy chain transgenes comprises at least one C H gene.
  • the heavy chain transgene may contain functional isotype switch sequences, which are capable of supporting isotype switching of a heterologous transgene encoding multiple C H genes in B-cells of the transgenic animal.
  • Such switch sequences may be those which occur naturally in the germline immunoglobulin locus from the species that serves as the source of the transgene C H genes, or such switch sequences may be derived from those which occur in the species that is to receive the transgene construct (the transgenic animal) .
  • a human transgene construct that is used to produce a transgenic mouse may produce a higher frequency of isotype switching events if it incorporates switch sequences similar to those that occur naturally in the mouse heavy chain locus, as presumably the mouse switch sequences are optimized to function with the mouse switch recombinase enzyme system, whereas the human switch sequences are not.
  • Switch sequences made be isolated and cloned by conventional cloning methods, or may be synthesized de novo from overlapping synthetic oligonucleotides designed on the basis of published sequence information relating to immunoglobulin switch region sequences (Mills et al., Nucl. Acids Res. 18: ⁇ 305- ⁇ 316 (1991);
  • heterologous heavy and light chain immunoglobulin transgenes are found in a significant fraction of the B-cells of the transgenic animal (at least 10 percent).
  • the transgenes of the invention include a heavy chain transgene comprising DNA encoding at least one variable gene segment, one diversity gene segment, one joining gene segment and at least one constant region gene segment.
  • the immunoglobulin light chain transgene comprises DNA encoding at least one variable gene segment, one joining gene segment and at least one constant region gene segment.
  • the gene segments encoding the light and heavy chain gene segments are
  • the transgene is constructed such that the individual gene segments are unrearranged, i.e., not rearranged so as to encode a functional immunoglobulin light or heavy chain.
  • unrearranged transgenes support
  • V, D, and J gene segments preferably support incorporation of all or a portion of a D region gene segment in the resultant
  • the transgenes comprise an unrearranged "mini-locus".
  • Such transgenes typically comprise a substantial portion of the C, D, and J segments as well as a subset of the V gene segments.
  • the various regulatory sequences e.g. promoters, enhancers, class switch regions, splice-donor and splice- acceptor sequences for RNA processing, recombination signals and the like, comprise corresponding sequences derived from the heterologous DNA.
  • Such regulatory sequences may be incorporated into the transgene from the same or a related species of the non-human animal used in the invention.
  • human immunoglobulin gene segments may be combined in a transgene with a rodent immunoglobulin enhancer sequence for use in a transgenic mouse.
  • synthetic regulatory sequences may be incorporated into the transgene, wherein such synthetic regulatory sequences are not homologous to a
  • a minilocus comprises a portion of the genomic immunoglobulin locus having at least one internal (i.e., not at a terminus of the portion) deletion of a non-essential DNA portion (e.g., intervening sequence; intron or portion thereof) as compared to the naturally-occurring germline Ig locus.
  • the invention also includes transgenic animals containing germ line cells having a heavy and light transgene wherein one of the said transgenes contains rearranged gene segments with the other containing unrearranged gene segments.
  • the rearranged transgene is a light chain immunoglobulin transgene and the unrearranged transgene is a heavy chain immunoglobulin transgene.
  • the basic structure of all immunoglobulins is based upon a unit consisting of two light polypeptide chains and two heavy polypeptide chains. Each light chain comprises two regions known as the variable light chain region and the constant light chain region. Similarly, the immunoglobulin heavy chain comprises two regions designated the variable heavy chain region and the constant heavy chain region.
  • the constant region for the heavy or light chain is encoded by genomic sequences referred to as heavy or light constant region gene (C H ) segments.
  • C H heavy or light constant region gene
  • the use of a particular heavy chain gene segment defines the class of immunoglobulin.
  • the ⁇ constant region gene segments define the IgM class of antibody whereas the use of a ⁇ , ⁇ 2, ⁇ 3 or ⁇ 4 constant region gene segment defines the IgG class of antibodies as well as the IgG subclasses IgG1 through IgG4.
  • the use of a ⁇ 1 or ⁇ 2 constant region gene segment defines the IgA class of antibodies as well as the subclasses IgA1 and lgA2.
  • the ⁇ and ⁇ constant region gene segments define the IgD and IgE antibody classes, respectively.
  • variable regions of the heavy and light immunoglobulin chains together contain the antigen binding domain of the antibody. Because of the need for diversity in this region of the antibody to permit binding to a wide range of antigens, the DNA encoding the initial or primary
  • repertoire variable region comprises a number of different DNA segments derived from families of specific variable region gene segments.
  • families comprise variable (V) gene segments and joining (J) gene segments.
  • V variable
  • J joining
  • the initial variable region of the light chain is encoded by one V gene segment and one J gene segment each selected from the family of V and J gene segments contained in the genomic DNA of the organism.
  • the DNA encoding the initial or primary repertoire variable region of the heavy chain comprises one heavy chain V gene segment, one heavy chain diversity (D) gene segment and one J gene segment, each selected from the appropriate V, D and J families of
  • a heavy chain transgene include cis-acting sequences that support functional V-D-J rearrangement that can incorporate all or part of a D region gene sequence in a rearranged V-D-J gene sequence. Typically, at least about 1 percent of
  • transgene-encoded heavy chains include recognizable D region sequences in the V region.
  • at least about 10 percent of transgene-encoded V regions include recognizable D region sequences, more preferably at least about 30 percent, and most preferably more than 50 percent include recognizable D region sequences.
  • a recognizable D region sequence is generally at least about eight consecutive nucleotides corresponding to a sequence present in a D region gene segment of a heavy chain transgene and/or the amino acid sequence encoded by such D region nucleotide sequence.
  • a transgene includes the D region gene DHQ52
  • a transgene sequence is recognizable as containing a D region sequence, specifically a DHQ52 sequence.
  • a transgene includes the D region gene DHQ52
  • a transgene-encoded heavy chain polypeptide containing the amino acid sequence -DAF- located in the V region between a V gene segment amino acid sequence and a J gene segment amino acid sequence may be recognizable as containing a D region
  • D region segments may be incorporated in VDJ joining to various extents and in various reading frames, a comparison of the D region area of a heavy chain variable region to the D region segments present in the transgene is necessary to determine the incorporation of particular D segments.
  • potential exonuclease digestion during recombination may lead to imprecise V-D and D-J joints during V-D-J recombination.
  • D region sequences may be recognizable but may not correspond identically to a consecutive D region sequence in the transgene.
  • a nucleotide sequence 5'- CTAAXTGGGG-3', where X is A, T, or G, and which is located in a heavy chain V region and flanked by a V region gene sequence and a J region gene sequence can be recognized as
  • polypeptide sequences -DAFDI-, -DYFDY-, or -GAFDI- located in a V region and flanked on the amino-terminal side by an amino acid sequence encoded by a transgene V gene sequence and flanked on the carboxyterminal side by an amino acid sequence encoded by a transgene J gene sequence is recognizable as a D region sequence.
  • amino acid sequence or nucleotide sequence is recognizable as a D region sequence if: (1) the sequence is located in a V region and is flanked on one side by a V gene sequence (nucleotide sequence or deduced amino acid sequence) and on the other side by a J gene sequence (nucleotide
  • sequence or deduced amino acid sequence and (2) the sequence is substantially identical or substantially similar to a known D gene sequence (nucleotide sequence or encoded amino acid sequence).
  • substantially identical denotes a characteristic of a polypeptide sequence or nucleic acid sequence, wherein the polypeptide sequence has at least 50 percent sequence identity compared to a reference sequence, and the nucleic acid sequence has at least ⁇ 0 percent sequence identity compared to a reference sequence.
  • the percentage of sequence identity is calculated excluding small deletions or additions which total less than 35 percent of the reference sequence.
  • the reference sequence may be a subset of a larger sequence, such as an entire D gene; however, the reference sequence is at least 8 nucleotides long in the case of
  • the reference sequence is at least 8 to 12 nucleotides or at least 3 to 4 amino acids, and preferably the reference sequence is 12 to 15 nucleotides or more, or at least 5 amino acids.
  • substantially similarity denotes a characteristic of an polypeptide sequence, wherein the
  • polypeptide sequence has at least 80 percent similarity to a reference sequence.
  • the percentage of sequence similarity is calculated by scoring identical amino acids or positional conservative amino acid substitutions as similar.
  • positional conservative amino acid substitution is one that can result from a single nucleotide substitution; a first amino acid is replaced by a second amino acid where a codon for the first amino acid and a codon for the second amino acid can differ by a single nucleotide substitution.
  • sequence -Lys-Glu-Arg-Val- is substantially similar to the sequence -Asn-Asp-Ser-Val-, since the codon sequence -AAA-GAA-AGA-GUU- can be mutated to -AAC-GAC-AGC-GUU-by introducing only 3 substitution mutations, single
  • the reference sequence may be a subset of a larger sequence, such as an entire D gene; however, the reference sequence is at least 4 amino residues long. Typically, the reference sequence is at least 5 amino acids, and preferably the
  • reference sequence is 6 amino acids or more.
  • immunoglobulin gene segments the V, D, J and constant (C) gene segments are found, for the most part, in clusters of V, D, J and C gene segments in the precursors of primary
  • RSS's recombination signal sequences
  • V, D and J segments flank recombinationally competent V, D and J segments.
  • RSS's necessary and sufficient to direct recombination comprise a dyad-symmetric heptamer, an AT-rich nonamer and an intervening spacer region of either 12 or 23 base pairs.
  • each V and D gene segment comprises the sequence CACAGTG or its analogue followed by a spacer of unconserved sequence and then a nonamer having the sequence ACAAAAACC or its analogue. These sequences are found on the J, or downstream side, of each V and D gene segment. Immediately preceding the germline D and J segments are again two recombination signal sequences, first the nonamer and then the heptamer again separated by an unconserved sequence. The heptameric and nonameric sequences following a V L , V H or D segment are complementary to those preceding the J L , D or J H segments with which they recombine. The spacers between the heptameric and nonameric sequences are either 12 base pairs long or between 22 and 24 base pairs long.
  • variable recombination between the V and J segments in the light chain and between the D and J segments of the heavy chain.
  • Such variable recombination is generated by variation in the exact place at which such segments are joined.
  • variation in the light chain typically occurs within the last codon of the V gene segment and the first codon of the J segment.
  • Similar imprecision in joining occurs on the heavy chain chromosome between the D and J H segments and may extend over as many as 10 nucleotides.
  • nucleotides may be inserted between the D and J H and between the V H and D gene segments which are not encoded by genomic DNA.
  • the addition of these nucleotides is known as N-region diversity.
  • RNA transcript After VJ and/or VDJ rearrangement, transcription of the rearranged variable region and one or more constant region gene segments located downstream from the rearranged variable region produces a primary RNA transcript which upon
  • RNA splicing results in an mRNA which encodes a full length heavy or light immunoglobulin chain.
  • heavy and light chains include a leader signal sequence to effect secretion through and/or insertion of the immunoglobulin into the transmembrane region of the B-cell.
  • the DNA encoding this signal sequence is contained within the first exon of the V segment used to form the variable region of the heavy or light immunoglobulin chain.
  • Appropriate regulatory sequences are also present in the mRNA to control translation of the mRNA to produce the encoded heavy and light immunoglobulin
  • polypeptides which upon proper association with each other form an antibody molecule.
  • variable region gene segments and the variable recombination which may occur during such joining is the production of a primary antibody repertoire.
  • each B-cell which has differentiated to this stage produces a single primary repertoire antibody.
  • cellular events occur which suppress the functional
  • allelic exclusion The process by which diploid B-cells maintain such mono-specificity is termed allelic exclusion.
  • B-cell clones expressing immunoglobulins from within the set of sequences comprising the primary repertoire are immediately available to respond to foreign antigens. Because of the limited diversity generated by simple VJ and VDJ joining, the antibodies produced by the so-called primary response are of relatively low affinity.
  • Two different types of B-cells make up this initial response: precursors of primary antibody-forming cells and precursors of secondary repertoire B-cells (Linton et al., Cell 59:1049-1059 (1989)).
  • the first type of B-cell matures into IgM-secreting plasma cells in response to certain antigens.
  • the other B-cells respond to initial exposure to antigen by entering a T-cell dependent maturation pathway.
  • the structure of the antibody molecule on the cell surface changes in two ways: the constant region switches to a non-IgM subtype and the sequence of the variable region can be modified by multiple single amino acid substitutions to produce a higher affinity antibody molecule.
  • variable region of a heavy or light Ig chain contains an antigen binding domain. It has been determined by amino acid and nucleic acid
  • CDR1, CDR2 and CDR3 also referred to as hypervariable regions 1, 2 and 3
  • the CDR1 and CDR2 are located within the variable gene segment whereas the CDR3 is largely the result of recombination between V and J gene segments or V, D and J gene segments.
  • Those portions of the variable region which do not consist of CDR1, 2 or 3 are commonly referred to as framework regions designated FR1, FR2, FR3 and FR4. See Fig. 1.
  • framework regions designated FR1, FR2, FR3 and FR4
  • rearranged DNA is mutated to give rise to new clones with altered Ig molecules.
  • Those clones with higher affinities for the foreign antigen are selectively expanded by helper
  • T-cells giving rise to affinity maturation of the expressed antibody.
  • Clonal selection typically results in expression of clones containing new mutation within the CDR1, 2 and/or 3 regions. However, mutations outside these regions also occur which influence the specificity and affinity of the antigen binding domain.
  • Transgenic non-human animals in one aspect of the invention are produced by introducing at least one of the immunoglobulin transgenes of the invention (discussed
  • non-human animals which are used in the invention generally comprise any mammal which is capable of rearranging immunoglobulin gene segments to produce a primary antibody response.
  • nonhuman transgenic animals may include, for example, transgenic pigs, transgenic rats, transgenic rabbits, transgenic cattle, and other transgenic animal species, particularly mammalian species, known in the art.
  • particularly preferred non-human animal is the mouse or other members of the rodent family.
  • mice any non-human mammal which is capable of mounting a primary and secondary antibody response may be used.
  • Such animals include non-human primates, such as chimpanzee, bovine, ovine, and porcine species, other members of the rodent family, e.g. rat, as well as rabbit and guinea pig.
  • Particular preferred animals are mouse, rat, rabbit and guinea pig, most preferably mouse.
  • various gene segments from the human genome are used in heavy and light chain transgenes in an unrearranged form.
  • such transgenes are introduced into mice.
  • the unrearranged gene segments of the light and/or heavy chain transgene have DNA sequences unique to the human species which are
  • the transgenes comprise rearranged heavy and/or light
  • transgenes corresponding to functionally rearranged VDJ or VJ segments contain immunoglobulin DNA sequences which are also clearly distinguishable from the endogenous immunoglobulin gene segments in the mouse.
  • sequences may be detected in the transgenic non-human animals of the invention with antibodies specific for immunoglobulin epitopes encoded by human immunoglobulin gene segments.
  • Transgenic B-cells containing unrearranged transgenes from human or other species functionally recombine the appropriate gene segments to form functionally rearranged light and heavy chain variable regions. It will be readily apparent that the antibody encoded by such rearranged
  • transgenes has a DNA and/or amino acid sequence which is heterologous to that normally encountered in the nonhuman animal used to practice the invention.
  • an "unrearranged immunoglobulin heavy chain transgene” comprises DNA encoding at least one variable gene segment, one diversity gene segment, one joining gene segment and one constant region gene segment.
  • Each of the gene segments of said heavy chain transgene are derived from, or has a sequence corresponding to, DNA encoding
  • an "unrearranged immunoglobulin light chain transgene” comprises DNA encoding at least one variable gene segment, one joining gene segment and at least one constant region gene segment wherein each gene segment of said light chain transgene is derived from, or has a sequence corresponding to, DNA encoding immunoglobulin light chain gene segments from a species not consisting of the non-human animal into which said light chain transgene is introduced.
  • Such heavy and light chain transgenes in this aspect of the invention contain the above-identified gene segments in an unrearranged form.
  • interposed between the V, D and J segments in the heavy chain transgene and between the V and J segments on the light chain transgene are appropriate.
  • transgenes also include appropriate RNA splicing signals to join a constant region gene segment with the VJ or VDJ
  • switch regions are incorporated upstream from each of the constant region gene segments and downstream from the variable region gene segments to permit recombination between such constant regions to allow for immunoglobulin class switching, e.g. from IgM to IgG.
  • switch regions are incorporated upstream from each of the constant region gene segments and downstream from the variable region gene segments to permit recombination between such constant regions to allow for immunoglobulin class switching, e.g. from IgM to IgG.
  • immunoglobulin transgenes also contain transcription control sequences including promoter regions situated upstream from the variable region gene segments which typically contain TATA motifs.
  • a promoter region can be defined approximately as a DNA sequence that, when operably linked to a downstream sequence, can produce transcription of the downstream
  • Promoters may require the presence of additional linked cis-acting sequences in order to produce efficient transcription.
  • other sequences that participate in the transcription of sterile transcripts are preferably included. Examples of sequences that participate in
  • sequences typically include about at least 50 bp immediately upstream of a switch region, preferably about at least 200 bp upstream of a switch region; and more preferably about at least 200-1000 bp or more upstream of a switch region. Suitable sequences occur immediately upstream of the human S ⁇ 1 , S ⁇ 2 , S ⁇ 3 , S ⁇ 4 , S ⁇ 1 , S ⁇ 2 , and S ⁇ switch
  • IFN interferon inducible transcriptional regulatory elements, such as IFN-inducible enhancers, are preferably included immediately upstream of transgene switch sequences.
  • promoters In addition to promoters, other regulatory sequences which function primarily in B-lineage cells are used. Thus, for example, a light chain enhancer sequence situated
  • regulatory enhancers are used to maximize the transcription and translation of the transgene so as to induce allelic exclusion and to provide relatively high levels of transgene expression.
  • regulatory control sequences have been generically described, such regulatory sequences may be heterologous to the nonhuman animal being derived from the genomic DNA from which the heterologous transgene immunoglobulin gene segments are obtained. Alternately, such regulatory gene segments are derived from the corresponding regulatory sequences in the genome of the non-human animal, or closely related species, which contains the heavy and light transgene.
  • gene segments are derived from human beings.
  • the transgenic non-human animals harboring such heavy and light transgenes are capable of mounting an Ig-mediated immune response to a specific antigen administered to such an animal.
  • B-cells are produced within such an animal which are capable of producing heterologous human antibody.
  • an appropriate monoclonal antibody e.g. a hybridoma
  • a source of therapeutic human monoclonal antibody is provided.
  • Such human Mabs have significantly reduced immunogenicity when therapeutically administered to humans.
  • transgenic nonhuman animals contain functionally at least one rearranged
  • heterologous heavy chain immunoglobulin transgene in the germline of the transgenic animal.
  • Such animals contain primary repertoire B-cells that express such rearranged heavy transgenes.
  • B-cells preferably are capable of undergoing somatic mutation when contacted with an antigen to form a heterologous antibody having high affinity and specificity for the antigen.
  • Said rearranged transgenes will contain at least two C H genes and the associated sequences required for isotype switching.
  • the invention also includes transgenic animals containing germ line cells having heavy and light transgenes wherein one of the said transgenes contains rearranged gene segments with the other containing unrearranged gene segments.
  • the heavy chain transgenes shall have at least two C H genes and the associated sequences required for isotype switching.
  • the invention further includes methods for
  • the method comprises generating a population of immunoglobulin V segment DNAs wherein each of the V segment DNAs encodes an
  • immunoglobulin V segment contains at each end a cleavage recognition site of a restriction endonuclease.
  • transgenes shall have at least two C H genes and the associated sequences required for isotype switching.
  • the cell In the development of a B lymphocyte, the cell initially produces IgM with a binding specificity determined by the productively rearranged V H and V L regions.
  • each B cell and its progeny cells synthesize antibodies with the same L and H chain V regions, but they may switch the isotype of the H chain.
  • This gene rearrangement process typically occurs by recombination between so called switch segments located immediately upstream of each heavy chain gene (except ⁇ ).
  • the individual switch segments are between 2 and 10 kb in length, and consist primarily of short repeated sequences.
  • the switch (S) region of the ⁇ gene, S ⁇ is located about 1 to 2 kb 5' to the coding sequence and is composed of numerous tandem repeats of sequences of the form (GAGCT) n (GGGGT), where n is usually 2 to 5 but can range as high as 17. (See T. Nikaido et al. Nature 292:845-848 (1981))
  • All the sequenced S regions include numerous occurrences of the pentamers GAGCT and GGGGT that are the basic repeated elements of the S ⁇ gene (T. Nikaido et al., J. Biol. Chem. 257:7322-7329 (1982) which is incorporated herein by reference); in the other S regions these pentamers are not precisely tandemly repeated as in S ⁇ , but instead are embedded in larger repeat units.
  • the S ⁇ 1 region has an additional higher-order structure: two direct repeat sequences flank each of two clusters of 49-bp tandem repeats. (See M. R.
  • Switch regions of human H chain genes have been found to be very similar to their mouse homologs. Indeed, similarity between pairs of human and mouse clones 5' to the C H genes has been found to be confined to the S regions, a fact that confirms the biological significance of these regions.
  • a switch recombination between ⁇ and ⁇ genes produces a composite S ⁇ -S ⁇ sequence.
  • the switch machinery can apparently accommodate different alignments of the repeated homologous regions of germline S precursors and then join the sequences at different positions within the alignment.
  • the switch machinery can apparently accommodate different alignments of the repeated homologous regions of germline S precursors and then join the sequences at different positions within the alignment.
  • cytokines might upregulate isotype-specific recombinases, it is also possible that the same enzymatic machinery catalyzes switches to all isotypes and that specificity lies in
  • T-cell-derived lymphokines IL-4 and IFN ⁇ have been shown to specifically promote the expression of certain isotypes: in the mouse, IL-4 decreases IgM, IgG2a, IgG2b, and IgG3 expression and increases IgE and IgG1 expression; while IFN ⁇ selectively stimulates IgG2a expression and antagonizes the IL-4-induced increase in IgE and IgG1 expression (Coffraan et al., J. Immunol. 136: 949 (1986) and Snapper et al.,
  • lymphokines actually promote switch recombination.
  • the observed induction of the ⁇ 1 sterile transcript by IL-4 and inhibition by IFN- ⁇ correlates with the observation that IL-4 promotes class switching to ⁇ 1 in B-cells in culture, while IFN- ⁇ inhibits ⁇ 1 expression. Therefore, the inclusion of regulatory sequences that affect the transcription of sterile transcripts may also affect the rate of isotype switching. For example, increasing the transcription of a particular sterile transcript typically can be expected to enhance the frequency of isotype switch
  • transgenes incorporate transcriptional regulatory sequences within about 1-2 kb upstream of each switch region that is to be utilized for isotype switching.
  • These transcriptional regulatory sequences preferably include a promoter and an enhancer element, and more preferably include the 5' flanking (i.e., upstream) region that is naturally associated (i.e., occurs in germline configuration) with a switch region. This 5' flanking (i.e., upstream) region that is naturally associated (i.e., occurs in germline configuration) with a switch region. This 5'
  • flanking region is typically about at least 50 nucleotides in length, preferably about at least 200 nucleotides in length, and more preferably at least 500-1000 nucleotides.
  • a 5' flanking sequence from one switch region can be operably linked to a different switch region for transgene construction (e.g., a 5' flanking sequence from the human S ⁇ 1 switch can be grafted immediately upstream of the S ⁇ 1 switch; a murine S ⁇ 1 flanking region can be grafted adjacent to a human ⁇ 1 switch sequence; or the murine S ⁇ 1 switch can be grafted onto the human ⁇ 1 coding region), in some embodiments it is preferred that each switch region incorporated in the transgene construct have the 5' flanking region that occurs immediately upstream in the naturally occurring germline configuration.
  • Monoclonal antibodies can be obtained by various techniques familiar to those skilled in the art. Briefly, spleen cells from an animal immunized with a desired antigen are immortalized, commonly by fusion with a myeloma cell (see. Kohler and Milstein, Eur. J. Immunol., 6:511-519 (1976)).
  • the rearranged heavy chain gene consists of a signal peptide exon, a variable region exon and a tandem array of multi-domain constant region regions, each of which is encoded by several exons.
  • Each of the constant region genes encode the constant portion of a different class of immunoglobulins.
  • RNA splicing For each heavy chain class, alternative patterns of RNA splicing give rise to both transmembrane and secreted immunoglobulins.
  • the human heavy chain locus is estimated to consist of approximately 200 V gene segments (current data supports the existence of about 50-100 V gene segments) spanning 2 Mb, approximately 30 D gene segments spanning about 40 kb, six J segments clustered within a 3 kb span, and nine constant region gene segments spread out over approximately 300 kb.
  • the entire locus spans approximately 2.5 Mb of the distal portion of the long arm of chromosome 14.
  • immunoglobulin heavy and light chain transgenes comprise unrearranged genomic DNA from humans.
  • a preferred transgene comprises a NotI fragment having a length between 670 to 830 kb. The length of this fragment is ambiguous because the 3' restriction site has not been accurately mapped. It is known, however, to reside between the ⁇ l and ⁇ pa gene segments. This fragment contains members of all .six of the known V H families, the D and J gene segments, as well as the ⁇ , ⁇ , ⁇ 3, ⁇ 1 and ⁇ 1 constant regions (Berman et al., EMBO J. 2:727-738 (1988), which is incorporated herein by reference).
  • IgM B-cell development
  • IgG 1 switched heavy chain class
  • a genomic fragment containing all of the necessary gene segments and regulatory sequences from a human light chain locus may be similarly constructed.
  • Such transgenes are constructed as described in the Examples and in copending application, entitled “Transgenic Non-Human Animals Capable of Producing Heterologous Antibodies,” filed August 29, 1990, under U.S.S.N. 07/574,748.
  • immunoglobulin heavy chain locus may be formed in vivo in the non-human animal during transgenesis.
  • Such in vivo transgene construction is produced by introducing two or more
  • fragments have DNA sequences which are substantially identical
  • Such in vivo transgene construction may be used to introduce into a non-human animal substantially the entire immunoglobulin loci from a species not consisting of the transgenic non-human animal.
  • in vivo homologous recombination may also be utilized to form "mini-locus" transgenes as described in the Examples.
  • portions of the DNA fragments preferably comprise about 500 bp to about 2000 bp, most preferably 1.0 kb to 2.0 kb. Homologous recombination of overlapping DNA fragments to form transgenes in vivo is further described in commonly assigned U.S. Patent Application entitled "Intracellular Generation of DNA by
  • immunoglobulin minilocus refers to a DNA sequence (which may be within a longer
  • DNA sequence usually of less than about 150 kb, typically between about 25 and 100 kb, containing at least one each of the following: a functional variable (V) gene segment, a functional joining (J) region segment, at least one functional constant (C) region gene segment, and ⁇ if it is a heavy chain minilocus ⁇ a functional diversity (D) region segment, such that said DNA sequence contains at least one substantial discontinuity (e.g., a deletion, usually of at least about 2 to 5 kb, preferably 10-25 kb or more, relative to the
  • a light chain minilocus transgene will be at least 25 kb in length, typically 50 to 60 kb.
  • a heavy chain transgene will typically be about 70 to 80 kb in length, preferably at least about 60 kb with two
  • the individual elements of the minilocus are preferably in the germline configuration and capable of undergoing gene rearrangement in the pre-B cell of a
  • transgenic animal so as to express functional antibody
  • a heavy chain minilocus comprising at least two C H genes and the requisite switching sequences is typically capable of undergoing isotype switching, so that functional antibody molecules of different immunoglobulin classes will be generated.
  • switching may occur in vivo in B-cells residing within the transgenic nonhuman animal, or may occur in cultured cells of the B-cell lineage which have been explanted from the
  • immunoglobulin heavy chain transgenes comprise one or more of each of the V H , D, and J H gene segments and two or more of the C H genes. At least one of each appropriate type gene segment is
  • the transgene contain at least one ⁇ gene segment and at least one other constant region gene segment, more preferably a ⁇ gene segment, and most preferably ⁇ 3 or ⁇ 1.
  • constant region gene segments may also be used such as those which encode for the production of IgD, IgA and IgE.
  • transgenes wherein the order of occurrence of heavy chain C H genes will be different from the naturally-occurring spatial order found in the germline of the species serving as the donor of the C H genes.
  • C H genes from more than one individual of a species (e.g., allogeneic C H genes) and incorporate said genes in the
  • the resultant transgenic nonhuman animal may then, in some embodiments, make antibodies of various classes including all of the allotypes represented in the species from which the transgene C H genes were obtained.
  • C H gene combinations will produce a transgenic nonhuman animal which may produce antibodies of various classes corresponding to C H genes from various
  • Transgenic nonhuman animals containing interspecies C H transgenes may serve as the source of B-cells for
  • the heavy chain J region segments in the human comprise six functional J segments and three pseudo genes clustered in a 3 kb stretch of DNA. Given its relatively compact size and the ability to isolate these segments
  • J region gene segments be used in the mini-locus construct. Since this fragment spans the region between the ⁇ and ⁇ genes, it is likely to contain all of the 3 ' cis-linked regulatory elements required for ⁇ expression. Furthermore, because this fragment includes the entire J region, it contains the heavy chain enhancer and the ⁇ switch region (Mills et al.. Nature 306:809 (1983); Yancopoulos and Alt, Ann. Rev. Immunol. 4:339-368 (1986), which are incorporated herein by reference).
  • the human D region consists of 4 homologous 9 kb subregions, linked in tandem (Siebenlist, et al . ( 1981) ,
  • Each subregion contains up to 10 individual D segments. Some of these segments have been mapped and are shown in Fig. 4.
  • Two different strategies are used to generate a mini-locus D region. The first strategy involves using only those D segments located in a short contiguous stretch of DNA that includes one or two of the repeated D subregions.
  • a candidate is a single 15 kb fragment that contains 12 individual D segments. This piece of DNA consists of 2 contiguous EcoRI fragments and has been
  • D segments should be sufficient for a primary repertoire.
  • an alternative strategy is to ligate together several non-contiguous D-segment containing fragments, to produce a smaller piece of DNA with a greater number of segments. Additional D-segment genes can be identified, for example, by the presence of characteristic flanking nonamer and heptamer sequences, supra. and by reference to the literature.
  • At least one, and preferably more than one V gene segment is used to construct the heavy chain minilocus transgene.
  • Rearranged or unrearranged V segments with or without flanking sequences can be isolated as described in copending applications, U.S.S.N. 07/574,748 filed August 29, 1990, PCT/US91/06185 filed August 28, 1991, and U.S.S.N.
  • V segments, D segments, J segments, and C genes can be isolated as described in copending applications U.S.S.N. 07/574,748 filed August 29, 1990 and PCT/US91/06185 filed August 28, 1991.
  • a minilocus light chain transgene may be similarly constructed from the human ⁇ or ⁇ immunoglobulin locus.
  • an immunoglobulin heavy chain minilocus transgene construct e.g., of about ⁇ 5 kb, encoding V, D, J and constant region sequences can be formed from a plurality of DNA fragments, with each sequence being substantially homologous to human gene sequences.
  • the sequences are operably linked to transcription regulatory sequences and are capable of undergoing rearrangement.
  • constant region sequences e.g., ⁇ and ⁇
  • switch recombination also occurs.
  • An exemplary light chain transgene construct can be formed similarly from a plurality of DNA fragments, substantially homologous to human DNA and capable of undergoing
  • transgene constructs that are intended to undergo class switching should include all of the cis-acting sequences necessary to regulate sterile transcripts.
  • Switch regions and upstream promoters and regulatory sequences are preferred cis-acting sequences that are included in transgene constructs capable of isotype switching.
  • switch regions can be linked upstream of (and adjacent to) C H genes that do not naturally occur next to the particular switch region.
  • a human ⁇ 1 switch region may be linked upstream from a human ⁇ 2 C H gene, or a murine ⁇ 1 switch may be linked to a human C H gene.
  • Heavy chain transgenes can be
  • V H is a heavy chain variable region gene segment
  • D is a heavy chain D (diversity) region gene segment
  • J H is a heavy chain J (joining) region gene segment
  • S D is a donor region segment capable of participating in a recombination event with the S a acceptor region
  • C 1 is a heavy chain constant region gene segment encoding an isotype utilized in for B cell development (e.g., ⁇ or ⁇ ) ,
  • T is a cis-acting transcriptional regulatory region
  • S A is an acceptor region segment capable of participating in a recombination event with selected S D donor region segments, such that isotype switching occurs
  • C 2 is a heavy chain constant region gene segment encoding an isotype other than ⁇ (e.g., ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , ⁇ 1 , ⁇ 2 , ⁇ ).
  • x, y, z, m, n, p, and q are integers, x is 1-100, n is 0-10, y is 1-50, p is 1-10, z is 1-50, q is 0-50, m is 0-10.
  • q must be at least 1, m is at least 1, n is at least 1, and m is greater than or equal to n.
  • V H , D, J H , S D , C 1 , T, S A , and C z segments may be selected from various species, preferably mammalian species, and more preferably from human and murine germline DNA.
  • V H segments may be selected from various species, but are preferably selected from V H segments that occur naturally in the human germline, such as V H251 . Typically about.2 V H gene segments are included, preferably about 4 V H segments are included, and most preferably at least about 10 V H segments are included.
  • At least one D segment is typically included, although at least 10 D segments are preferably included, and some embodiments include more than ten D segments. Some preferred embodiments include human D segments.
  • At least one J H segment is incorporated in the transgene, although it is preferable to include about six J H segments, and some preferred embodiments include more than about six J H segments. Some preferred embodiments include human J H segments, and further preferred embodiments include six human J H segments and no nonhuman J H segments.
  • S D segments are donor regions capable of
  • S D and S A are switch regions such as S ⁇ , S ⁇ 1 , S y2 . S y3 , S ⁇ 4 , S ⁇ , S a2 . and S ⁇ .
  • the switch regions are murine or human, more preferably S D is a human or murine S and S A is a human or murine S ⁇ 1 .
  • S D and S A are preferably the 400 basepair direct repeat sequences that flank the human ⁇ gene.
  • C 1 segments are typically ⁇ or ⁇ genes, preferably a ⁇ gene, and more preferably a human or murine ⁇ gene.
  • T segments typically include S' flanking sequences that are adjacent to naturally occurring (i.e., germline) switch regions. T segments typically at least about at least 50 nucleotides in length, preferably about at least 200 nucleotides in length, and more preferably at least 500-1000 nucleotides in length. Preferably T segments are 5' flanking sequences that occur immediately upstream of human or murine switch regions in a germline configuration. It is also evident to those of skill in the art that T segments may comprise cis-acting transcriptional regulatory sequences that do not occur naturally in an animal germline (e.g., viral enhancers and promoters such as those found in SV40,
  • adenovirus and other viruses that infect eukaryotic cells.
  • C 2 segments are typically a ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , a 1 , ⁇ 2 , or e C H gene, preferably a human C H gene of these isotypes, and more preferably a human ⁇ 1 or ⁇ 3 gene.
  • Murine ⁇ 2a and ⁇ 2b may also be used, as may downstream (i.e., switched) isotype genes form various species.
  • the total length of the transgene will be typically 150 kilo basepairs or less.
  • the transgene will be other than a native heavy chain Ig locus.
  • deletion of unnecessary regions or substitutions with corresponding regions from other species will be present.
  • transgenic nonhuman animal The occurrence of isotype switching in a transgenic nonhuman animal may be identified by any method known to those in the art. Preferred embodiments include the following, employed either singly or in combination:
  • detection of mRNA transcripts that contain a sequence homologous to at least one transgene downstream C H gene other than ⁇ and an adjacent sequence homologous to a transgene V H -D H -J H rearranged gene; such detection may be by Northern hybridization, S 1 nuclease protection assays, PCR
  • detection in DNA from B-cells of the transgenic animal or in genomic DNA from hybridoma cells, of DNA rearrangements consistent with the occurrence of isotype switching in the transgene, such detection may be accomplished by Southern blot hybridization, PCR amplification, genomic cloning, or other method; or
  • each transgenic line may represent a
  • transgenes are typically integrated into host chromosomal DNA, most usually into germline DNA and propagated by subsequent breeding of germline transgenic breeding stock animals. However, other vectors and transgenic methods known in the present art or subsequently developed may be substituted as appropriate and as desired by a
  • Trans-switching to endogenous nonhuman heavy chain constant region genes can occur and produce chimeric heavy chains and antibodies comprising such chimeric human/mouse heavy chains.
  • Such chimeric antibodies may be desired for certain uses described herein or may be undesirable.
  • the expression of successfully rearranged immunoglobulin heavy and light transgenes is expected to have a dominant effect by suppressing the rearrangement of the endogenous immunoglobulin genes in the transgenic nonhuman animal.
  • another way to generate a nonhuman that is devoid of endogenous antibodies is by mutating the endogenous immunoglobulin loci. Using embryonic stem cell technology and homologous recombination, the endogenous immunoglobulin repertoire can be readily eliminated. The following describes the functional description of the mouse immunoglobulin loci.
  • the vectors and methods disclosed, however, can be readily adapted for use in other non-human animals.
  • this technology involves the inactivation of a gene, by homologous recombination, in a pluripotent cell line that is capable of differentiating into germ cell tissue.
  • a DNA construct that contains an altered, copy of a mouse immunoglobulin gene is introduced into the nuclei of embryonic stem cells. In a portion of the cells, the introduced DNA recombines with the endogenous copy of the mouse gene,
  • the mouse ⁇ locus contributes to only 5% of the immunoglobulins, inactivation of the heavy chain and/or ⁇ -light chain loci is sufficient. There are three ways to disrupt each of these loci, deletion of the J region, deletion of the J-C intron enhancer, and disruption of constant region coding sequences by the introduction of a stop codon. The last option is the most straightforward, in terms of DNA construct design. Elimination of the ⁇ gene disrupts B-cell maturation thereby preventing class switching to any of the functional heavy chain segments. The strategy for knocking out these loci is outlined below.
  • targeting vectors are used based on the design employed by Jaenisch and co-workers (Zijlstra, et al. (1989), Nature, 342, 435-438) for the successful disruption of the mouse 02-microglobulin gene.
  • the neomycin resistance gene (neo) from the plasmid pMCIneo is inserted into the coding region of the target gene.
  • the pMCIneo insert uses a hybrid viral promoter/enhancer seguence to drive neo expression. This promoter is active in embryonic stem cells. Therefore, neo can be used as a selectable marker for integration of the knock-out construct.
  • the HSV thymidine kinase (tk) gene is added to the end of the construct as a negative selection marker against random insertion events (Zijlstra, et al., supra.).
  • a preferred strategy for disrupting the heavy chain locus is the elimination of the J region. This region is fairly compact in the mouse, spanning only 1.3 kb.
  • the heavy-chain locus is knocked out by disrupting the coding region of the ⁇ gene.
  • This approach involves the same 15 kb KpnI fragment used in the previous approach.
  • the 1.1 kb insert from pMCIneo is inserted at a unique BamHI site in exon II, and the HSV tk gene added to the 3' Kpnl end. Double crossover events on either side of the neo insert, that eliminate the tk gene, are then selected for. These are detected from pools of selected clones by PCR amplification.
  • One of the PCR primers is derived from neo sequences and the other from mouse sequences outside of the targeting vector. The functional disruption of the mouse immunoglobulin loci is presented in the Examples.
  • an alternative method for preventing the expression of an endogenous Ig locus is suppression.
  • Suppression of endogenous Ig genes may be accomplished with antisense RNA produced from one or more integrated transgenes, by antisense oligonucleotides, and/or by administration of antisera
  • Antisense RNA transgenes can be employed to partially or totally knock-out expression of specific genes (Pepin et al. (1991) Nature 355: 725; Helene., C. and Toulme, J. (1990) Biochimica Biophys. Acta 1049: 99; Stout, J. and Caskey, T. (1990) Somat. Cell Mol. Genet. 16: 369; Munir et al. (1990) Somat. Cell Mol. Genet. 16: 383, each of which is incorporated herein by reference).
  • Antisense polynucleotides are polynucleotides that: (1) are complementary to all or part of a reference sequence, such as a sequence of an endogenous Ig C H or C L region, and (2) which specifically hybridize to a
  • complementary target sequence such as a chromosomal gene locus or a Ig mRNA.
  • polynucleotides may include nucleotide substitutions,
  • Complementary antisense polynucleotides include soluble antisense RNA or DNA oligonucleotides which can hybridize specifically to
  • An antisense sequence is a polynucleotide
  • antisense sequences may have substitutions, additions, or deletions as compared to the complementary immunoglobulin gene sequence, so long as
  • an antisense sequence is complementary to an endogenous immunoglobulin gene sequence that encodes, or has the potential to encode after DNA
  • sense sequences corresponding to an immunoglobulin gene sequence may function to suppress expression, particularly by interfering with transcription.
  • antisense polynucleotides therefore inhibit production of the encoded polypeptide(s).
  • antisense polynucleotides that inhibit transcription and/or translation of one or more endogenous Ig loci can alter the capacity and/or specificity of a non-human animal to produce immunoglobulin chains encoded by endogenous Ig loci.
  • Antisense polynucleotides may be produced from a heterologous expression cassette in a transfectant cell or transgenic cell, such as a transgenic pluripotent
  • the antisense polynucleotides may comprise soluble oligonucleotides that are administered to the external milieu, either in culture medium in vitro or in the circulatory system or interstitial fluid in vivo. Soluble antisense polynucleotides present in the external milieu have been shown to gain access to the
  • the antisense polynucleotides comprise methylphosphonate moieties, alternatively phosphorothiolates or O-methylribonucleotides may be used, and chimeric
  • oligonucleotides may also be used (Dagle et al. (1990) Nucleic Acids Res. 18: 4751). For some applications, antisense
  • oligonucleotides may comprise polyamide nucleic acids (Nielsen et al. (1991) Science 254: 1497). For general methods
  • Antisense polynucleotides complementary to one or more sequences are employed to inhibit transcription, RNA processing, and/or translation of the cognate mRNA species and thereby effect a reduction in the amount of the respective encoded polypeptide.
  • Such antisense polynucleotides can provide a therapeutic function by inhibiting the formation of one or more endogenous Ig chains in vivo.
  • the antisense polynucleotides of this invention are selected so as to hybridize preferentially to endogenous Ig sequences at physiological conditions in vivo. Most typically, the
  • selected antisense polynucleotides will not appreciably hybridize to heterologous Ig sequences encoded by a heavy or light chain transgene of the invention (i.e., the antisense oligonucleotides will not inhibit transgene Ig expression by more than about 25 to 35 percent).
  • Partial or complete suppression of endogenous Ig chain expression can be produced by injecting mice with antisera against one or more endogenous Ig chains (Weiss et al. (1984) Proc. Natl. Acad. Sci. (U.S.A.) 81 211, which is incorporated herein by reference).
  • Antisera are selected so as to react specifically with one or more endogenous (e.g., murine) Ig chains but to have minimal or no cross-reactivity with heterologous Ig chains encoded by an Ig transgene of the invention.
  • administration of selected antisera are selected so as to react specifically with one or more endogenous (e.g., murine) Ig chains but to have minimal or no cross-reactivity with heterologous Ig chains encoded by an Ig transgene of the invention.
  • Suitable antibody sources for antibody comprise:
  • monoclonal antibodies such as a monoclonal antibody that specifically binds to a murine ⁇ , ⁇ , ⁇ , or ⁇ chains but does not react with the human immunoglobulin chain (s) encoded by a human Ig transgene of the invention;
  • polyclonal antiserum or mixtures thereof typically such antiserum/antisera is monospecific for binding to a single species of endogenous Ig chain (e.g., murine ⁇ , murine ⁇ , murine ⁇ , murine ⁇ ) or to multiple species of endogenous Ig chain, and most preferably such antisera
  • polyclonal antibodies are preferred, and such substantially monospecific polyclonal antibodies can be advantageously produced from an antiserum raised against human immunoglobulin (s) by pre-adsorption with antibodies derived from the nonhuman animal species (e.g., murine) and/or, for example, by affinity chromatography of the antiserum or purified fraction thereof on an affinity resin containing immobilized human Ig (wherein the bound fraction is enriched for the desired anti-human Ig in the antiserum; the bound fraction is typically eluted with conditions of low pH or a chaotropic salt solution).
  • Cell separation and/or complement fixation can be employed to provide the enhancement of antibody-directed cell depletion of lymphocytes expressing endogenous (e.g., murine) immunoglobulin chains.
  • endogenous (e.g., murine) immunoglobulin chains e.g., murine
  • antibodies are employed for ex vivo depletion of murine Ig-expressing explanted hematopoietic cells and/or B-lineage lymphocytes obtained from a transgenic mouse harboring a human Ig transgene.
  • hematopoietic cells and/or B-lineage lymphocytes are explanted from a transgenic nonhuman animal harboring a human Ig transgene (preferably harboring both a human heavy chain transgene and a human light chain transgene) and the explanted cells are incubated with an antibody (or antibodies) which (1) binds to an endogenous immunoglobulin (e.g., murine ⁇ and/or ⁇ ) and (2) lacks substantial binding to human immunoglobulin chains encoded by the transgene(s).
  • an antibody or antibodies
  • Such antibodies are referred to as "suppression antibodies” for clarity.
  • the explanted cell population is selectively
  • suppression antibody e.g., by ADCC,.by complement fixation, or by a toxin linked to the suppression antibody
  • clonal anergy induced by the suppression antibody and the like.
  • antibodies used for antibody suppression of endogenous Ig chain production will be capable of fixing complement. It is frequently preferable that such antibodies may be selected so as to react well with a convenient
  • complement source for ex vivo/in vitro depletion such as rabbit or guinea pig complement.
  • the suppressor antibodies possess effector functions in the nonhuman transgenic animal species; thus, a suppression antibody comprising murine effector functions (e.g., ADCC and complement fixation) generally would be preferred for use in transgenic mice.
  • a suppression antibody that specifically binds to a predetermined endogenous
  • immunoglobulin chain is used for ex vivo/in vitro depletion of lymphocytes expressing an endogenous immunoglobulin.
  • a cellular explant e.g., lymphocyte sample
  • a suppression antibody e.g., by immobilization, complement fixation, and the like
  • cells specifically binding to the suppression antibody are depleted (e.g., by immobilization, complement fixation, and the like), thus generating a cell subpopulation depleted in cells expressing endogenous (nonhuman) immunoglobulins (e.g., lymphocytes expressing murine Ig).
  • the resultant depleted lymphocyte population (T cells, human Ig-positive B-cells, etc.) can be transferred into a immunocompatible (i.e., MHC-compatible) nonhuman animal of the same species and which is substantially incapable of producing endogenous antibody (e.g., SCID mice, RAG-1 or RAG-2 knockout mice).
  • a immunocompatible nonhuman animal of the same species e.g., SCID mice, RAG-1 or RAG-2 knockout mice.
  • endogenous antibody e.g., SCID mice, RAG-1 or RAG-2 knockout mice.
  • B-cells producing such antibodies.
  • B-cells may be used to generate hybridomas by
  • Antibody suppression can be used in combination with other endogenous Ig
  • inactivation/suppression methods e.g., J H knockout, C H knockout, D-region ablation, antisense suppression,
  • VDJ human variable region
  • endogenous heavy chain locus by any of various methods, including but not limited to the following: (1) functionally disrupting and/or deleting by homologous recombination at least one and preferably all of the endogenous heavy chain constant region genes, (2) mutating at least one and
  • endogenous heavy chain constant region genes to encode a termination codon (or frameshift) to produce a truncated or frameshifted product (if trans-switched), and other methods and strategies apparent to those of skill in the art.
  • Deletion of a substantial portion or all of the heavy chain constant region genes and/or D-region genes may be accomplished by various methods, including sequential deletion by homologous recombination targeting vectors, especially of the "hit-and-run” type and the like.
  • functional disruption and/or deletion of at least one endogenous light chain locus e.g., ⁇
  • constant region genes is often preferable.
  • the heterologous transgene comprises a frameshift in the J segment(s) and a compensating frameshift (i.e., to regenerate the original reading frame) in the initial region (i.e., amino-terminal coding portion) of one or more (preferably all) of the transgene constant region genes.
  • Antisense suppression and antibody suppression may also be used to effect a substantially complete functional inactivation of endogenous Ig gene product expression (e.g., murine heavy and light chain sequences) and/or trans-switched antibodies (e.g., human variable/murine constant chimeric antibodies).
  • endogenous Ig gene product expression e.g., murine heavy and light chain sequences
  • trans-switched antibodies e.g., human variable/murine constant chimeric antibodies
  • suppression strategies may be used to effect essentially total suppression of endogenous (e.g., murine) Ig chain expression.
  • trans-switched immunoglobulin it may be desirable to produce a trans-switched immunoglobulin.
  • trans-switched heavy chains can be chimeric (i.e., a non-murine (human) variable region and a murine constant region).
  • Antibodies comprising such chimeric trans-switched
  • immunoglobulins can be used for a variety of applications where it is desirable to have a non-human (e.g., murine) constant region (e.g., for retention of effector functions in the host, for the presence of murine immunological
  • a non-human (e.g., murine) constant region e.g., for retention of effector functions in the host, for the presence of murine immunological
  • a human variable region repertoire may possess advantages as compared to the murine variable region repertoire with respect to certain antigens.
  • the human V H , D, J H , V L , and J L genes have been selected for during evolution for their ability to encode immunoglobulins that bind certain
  • antigens which provided evolutionary selective pressure for the murine repertoire can be distinct from those antigens which provided evolutionary pressure to shape the human repertoire.
  • Other repertoire advantages may exist, making the human variable region repertoire advantageous when combined with a murine constant region (e.g., a trans-switched murine) isotype.
  • a murine constant region e.g., a trans-switched murine
  • the presence of a murine constant region can afford advantages over a human constant region.
  • a murine y constant region linked to a human variable region by trans-switching may provide an antibody which possesses murine effector functions (e.g., ADCC, murine complement fixation) so that such a chimeric antibody (preferably monoclonal) which is reactive with a predetermined antigen (e.g., human IL-2 receptor) may be tested in a mouse disease model, such as a mouse model of graft-versus-host disease wherein the T lymphocytes in the mouse express a functional human IL-2 receptor.
  • murine effector functions e.g., ADCC, murine complement fixation
  • a chimeric antibody preferably monoclonal
  • a predetermined antigen e.g., human IL-2 receptor
  • the human variable region encoding sequence may be isolated (e.g., by PCR amplification or cDNA cloning from the source (hybridoma clone)) and spliced to a sequence encoding a desired human constant region to encode a human sequence antibody more suitable for human therapeutic uses where immunogenicity is preferably minimized.
  • the polynucleotide(s) having the resultant fully human encoding sequence(s) can be expressed in a host cell (e.g., from an expression vector in a mammalian cell) and purified for pharmaceutical formulation.
  • the chimeric antibodies may be used directly without replacing the murine constant region with a human constant region.
  • Other variations and uses of trans-switched chimeric antibodies will be evident to those of skill in the art.
  • the present invention provides transgenic nonhuman animals containing B lymphocytes which express chimeric antibodies, generally resulting from trans-switching between a human heavy chain transgene and an endogenous murine heavy chain constant region gene.
  • Such chimeric antibodies comprise a human sequence variable region and a murine constant region, generally a murine switched (i.e., non- ⁇ , non- ⁇ ) isotype.
  • the transgenic nonhuman animals capable of making chimeric
  • antibodies to a predetermined antigen are usually also.
  • the animal is homozygous for a functionally disrupted heavy chain locus and/or light chain locus but retains one or more endogenous heavy chain constant region gene(s) capable of trans-switching (e.g., ⁇ , ⁇ , e) and
  • Such a mouse is immunized with a predetermined antigen, usually in combination with an adjuvant, and an immune response comprising a
  • the serum of such an immunized animal can comprise such chimeric antibodies at concentrations of about at least 1 ⁇ g/ml, often about at least 10 ⁇ g/ml, frequently at least 30 ⁇ g/ml, and up to 50 to 100 ⁇ g/ml or more.
  • antibodies comprising chimeric human variable/mouse constant region heavy chains typically also comprises antibodies which comprise human variable/human constant region (complete human sequence) heavy chains.
  • Chimeric trans-switched antibodies usually comprise (1) a chimeric heavy chain composed of a human variable region and a murine constant region (typically a murine gamma) and (2) a human transgene-encoded light chain (typically kappa) or a murine light chain (typically lambda in a kappa knockout background).
  • Such chimeric trans-switched antibodies generally bind to a predetermined antigen (e.g., the immunogen) with an affinity of about at least 1 ⁇ 10 7 M -1 , preferably with an affinity of about at least 5 ⁇ 10 7 M -1 , more preferably with an affinity of at least 1 ⁇ 10 8 M -1 to 1 ⁇ 10 9 M -1 or more.
  • a predetermined antigen e.g., the immunogen
  • the predetermined antigen is a human protein, such as for example a human cell surface antigen (e.g., CD4, CD8, IL-2 receptor, EGF receptor, PDGF receptor), other human biological macromolecule (e.g., thrombomodulin, protein C, carbohydrate antigen, sialyl Lewis antigen, L-selectin), or nonhuman disease associated macromolecule (e.g., bacterial LPS, virion capsid protein or envelope glycoprotein) and the like.
  • a human cell surface antigen e.g., CD4, CD8, IL-2 receptor, EGF receptor, PDGF receptor
  • other human biological macromolecule e.g., thrombomodulin, protein C, carbohydrate antigen, sialyl Lewis antigen, L-selectin
  • nonhuman disease associated macromolecule e.g., bacterial LPS, virion capsid protein or envelope glycoprotein
  • the invention provides transgenic nonhuman animals comprising a genome comprising: (1) a homozygous functionally disrupted endogenous heavy chain locus comprising at least one murine constant region gene capable of trans-switching (e.g., in cis linkage to a functional switch recombination sequence and typically to a functional enhancer), (2) a human heavy chain transgene capable of rearranging to encode end express a functional human heavy chain variable region and capable of trans-switching (e.g., having a cis-linked RSS); optionally further comprising (3) a human light chain (e.g., kappa) transgene capable of rearranging to encode a functional human light chain variable region and expressing a human sequence light chain; optionally further comprising (4) a homozygous functionally disrupted endogenous light chain locus ( ⁇ , preferably ⁇ and ⁇ ); and optionally further comprising (5) a serum comprising an antibody comprising a chimeric heavy chain composed of a human sequence variable region
  • Such transgenic mice may further comprise a serum comprising chimeric antibodies which bind a predetermined human antigen (e.g., CD4, CD8, CEA) with an affinity of about at least 1 ⁇ 10 4 M -1 , preferably with an affinity of about at least 5 ⁇ 10 4 M -1 , more preferably with an affinity of at least 1 ⁇ 10 7 M -1 to 1 ⁇ 10 9 M -1 or more.
  • a predetermined human antigen e.g., CD4, CD8, CEA
  • hybridomas can be made wherein the monoclonal antibodies produced thereby have an affinity of at least 8 ⁇ 10 7 M -1 .
  • Chimeric antibodies comprising a heavy chain composed of a murine constant region and a .human variable region, often capable of binding to a nonhuman antigen, may also be present in the serum or as an antibody secreted from a hybridoma.
  • such chimeric antibodies can be generated by trans-switching, wherein a human transgene encoding a human variable region (encoded by productive V-D-J rearrangement in vivo) and a human constant region, typically human ⁇ ,
  • immunoglobulin constant gene switch sequence thereby operably linking the transgene-encoded human variable region with a heavy chain constant region which is not encoded by said transgene, typically an endogenous murine immunoglobulin heavy chain constant region or a heterologous (e.g., human) heavy chain constant region encoded on a second transgene.
  • cis-switching refers to isotype-switching by
  • trans-switching involves recombination between a transgene RSS and an RSS element outside the transgene, often on a different chromosome than the chromosome which harbors the transgene.
  • Trans-switching generally occurs between an RSS of an expressed transgene heavy chain constant region gene and either an RSS of an endogenous murine constant region gene (of a non- ⁇ isotype, typically ⁇ ) or an RSS of a human constant region gene contained on a second transgene, often integrated on a separate chromosome.
  • a non-chimeric antibody having a substantially fully human sequence is produced.
  • a polynucleotide encoding a human heavy chain constant region (e.g., ⁇ 1) and an operably linked RSS (e.g., a ⁇ 1 RSS) can be introduced (e.g., transfected) into a population of hybridoma cells generated from a
  • transgenic mouse B-cell (or B cell population) expressing an antibody comprising a transgene-encoded human ⁇ chain.
  • the resultant hybridoma cells can be selected for the presence of the introduced polynucleotide and/or for the expression of trans-switched antibody comprising a heavy chain having the variable region (idiotype/antigen reactivity) of the human ⁇ chain and having the constant region encoded by the introduced polynucleotide sequence (human ⁇ 1).
  • Trans-switch comprising a heavy chain having the variable region (idiotype/antigen reactivity) of the human ⁇ chain and having the constant region encoded by the introduced polynucleotide sequence (human ⁇ 1).
  • the invention also provides a method for producing such chimeric trans-switched antibodies comprising the step of immunizing with a predetermined antigen a transgenic mouse comprising a genome comprising: (1) a homozygous functionally disrupted endogenous heavy chain locus comprising at least one murine constant region gene capable of trans-switching (e.g., ⁇ 2a, ⁇ 2b, ⁇ 1, ⁇ 3), (2) a human heavy chain transgene capable of rearranging to encode a functional human heavy chain variable region and expressing a human sequence heavy chain and capable of undergoing isotype switching (and/or trans-switching), and optionally further comprising (3) a human light chain (e.g., kappa) transgene capable of rearranging to encode a functional human light (e.g., kappa) chain variable region and expressing a human sequence light chain, and optionally further comprising (4) a homozygous functionally disrupted endogenous light chain locus (typically ⁇ ,
  • a serum comprising an antibody comprising a chimeric heavy chain composed of a human sequence variable region encoded by a human transgene and a murine constant region sequence encoded by an endogenous murine heavy chain constant region gene (e.g., ⁇ 1, ⁇ 2a, ⁇ 2b, ⁇ 3).
  • trans-switching and cis-switching is associated with the process of somatic mutation.
  • Somatic mutation expands the range of antibody affinities encoded by clonal progeny of a B-cell.
  • hybridoma cell population which expresses a first antibody comprising a heavy chain comprising a first human heavy chain variable region in polypeptide linkage to a first human heavy chain constant region (e.g., ⁇ )
  • a hybridoma cell clonal variant which express an antibody comprising a heavy chain containing said first human heavy chain variable region in polypeptide linkage to a second heavy chain constant region (e.g., a human ⁇ , ⁇ , or e constant region).
  • a hybridoma cell population which expresses a first antibody comprising a heavy chain comprising a first human heavy chain variable region in polypeptide linkage to a first human heavy chain constant region (e.g., ⁇ )
  • hybridoma cell clonal variants which express an antibody comprising a heavy chain containing said first human heavy chain variable region in polypeptide linkage to a second heavy chain constant region (e.g., a human ⁇ , ⁇ , or e constant region).
  • trans- or cis- as through the administration of agents that promote isotype switching, such as T-cell-derived lymphokines (e.g., IL-4 and IFN ⁇ ), by introduction of a polynucleotide comprising a functional RSS and a heterologous (e.g. human) heavy chain constant region gene to serve as a substrate for trans-switching, or by a combination of the above, and the like.
  • agents that promote isotype switching such as T-cell-derived lymphokines (e.g., IL-4 and IFN ⁇ )
  • a polynucleotide comprising a functional RSS and a heterologous (e.g. human) heavy chain constant region gene to serve as a substrate for trans-switching, or by a combination of the above, and the like.
  • Class switching and affinity maturation take place within the same population of B cells derived from transgenic animals of the present invention. Therefore, identification of class-switched B cells (or hybridomas derived therefrom) can be used as a screening step for obtaining high affinity monoclonal antibodies.
  • a variety of approaches can be
  • a single continuous human genomic fragment comprising both ⁇ and ⁇ constant region genes with the associated RSS elements and switch regulatory elements (e.g., sterile transcript promoter) can be used as a transgene.
  • some portions of the desired single contiguous human genomic fragment can be difficult to clone efficiently, such as due to instability problems when replicated in a cloning host or the like; in particular, the region between ⁇ and ⁇ 3 can prove difficult to clone efficiently, especially as a contiguous fragment comprising the ⁇ gene, ⁇ 3 gene, a V gene, D gene segments, and J gene segments.
  • a discontinuous human transgene composed of a human ⁇ gene, human ⁇ 3 gene, a human V gene(s), human D gene segments, and human J gene segments, with one or more deletions of an intervening (intronic) or otherwise nonessential sequence (e.g., one or more V, D, and/or J segment and/or one or more non- ⁇ constant region gene(s)).
  • minigenes have several advantages as compared to isolating a single contiguous segment of genomic DNA spanning all of the essential elements for efficient
  • Such a minigene avoids the necessity of isolating large pieces of DNA which may contain sequences which are difficult to clone
  • miniloci comprising elements necessary for isotype switching (e.g., human ⁇ sterile transcript promoter) for producing cis- or trans-switching, can advantageously undergo somatic mutation and class switching in vivo.
  • isotype switching e.g., human ⁇ sterile transcript promoter
  • hybridoma clones producing antibodies having high binding affinity are obtained by selecting, from a pool of hybridoma cells derived from B cells of transgenic mice harboring a human heavy chain transgene capable of isotype switching (see, supra) and substantially lacking endogenous murine heavy chain loci capable of undergoing productive (in-frame) V-D-J rearrangement, hybridomas which express an antibody comprising a heavy chain comprising a human sequence heavy chain variable region in polypeptide linkage to a human (or mouse) non- ⁇ heavy chain constant region; said antibodys are termed "switched antibodies” as they comprise a "switched heavy chain” which is produced as a consequence of cis-switching and/or trans-switching in vivo or in cell culture.
  • Hybridomas producing switched antibodies generally have undergone
  • hybridomas secreting a human sequence antibody having substantial binding affinity greater than 1 ⁇ 10 7 M -1 to 1 ⁇ 10 8 M -1 ) for a predetermined antigen and wherein said human sequence antibody comprises human immunoglobulin
  • variable region (s) can be selected by a method comprising a two-step process. One step is to identify and isolate
  • hybridoma cells which secrete immunoglobulins which comprise a switched heavy chain e.g., by binding hybridoma cells to an immobilized immunoglobulin which specifically binds a switched heavy chain and does not substantially bind to an unswitched isotype, e.g., ⁇ ).
  • the other step is to identify hybridoma cells which bind to the predetermined antigen with substantial binding affinity (e.g., by ELISA of hybridoma clone
  • hybridoma cells which bind predetermined antigen which bind predetermined antigen.
  • Hybridoma cells which express switched antibodies that have substantial binding affinity for the predetermined antigen are isolated and cultured under suitable growth conditions known in the art, typically as individual selected clones.
  • the method comprises the step of culturing said selected clones under conditions suitable for expression of monocloanl antibodies; said monoclonal antibodies are collected and can be administered for therapeutic, prophylactic, and/or
  • the selected hybridoma clones can serve as a source of DNA or RNA for isolating immunoglobulin sequences which encode immunoglobulins (e.g. a variable region) that bind to (or confer binding to) the predetermined antigen.
  • immunoglobulins e.g. a variable region
  • the human variable region encoding sequence may be isolated (e.g., by PCR amplification or cDNA cloning from the source (hybridoma clone)) and spliced to a sequence encoding a desired human constant region to encode a human sequence antibody more suitable for human therapeutic uses where immunogenicity is preferably minimized.
  • polynucleotide (s) having the resultant fully human encoding sequence(s) can be expressed in a host cell (e.g., from an expression vector in a mammalian cell) and purified for pharmaceutical formulation.
  • a heterologous transgene capable of encoding a human immunoglobulin advantageously comprises a cis-linked enhancer which is not derived from the mouse genome, and/or which is not naturally associated in cis with the exons of the heterologous transgene.
  • a human ⁇ transgene e.g., a ⁇ minilocus
  • a human V ⁇ gene can advantageously comprise a human V ⁇ gene, a human J ⁇ gene, a human C ⁇ gene, and a xenoenhancer
  • said xenoenhancer comprises a human heavy chain intronic enhancer and/or a murine heavy chain intronic enhancer, typically located between a J ⁇ gene and the C ⁇ gene, or located downstream of the C ⁇ gene.
  • the mouse heavy chain J- ⁇ intronic enhancer (Banerji et al. (1983) Cell 33: 729) can be isolated on a 0.9 kb Xbal fragment of the plasmid pKVe2 (see, infra).
  • the human heavy chain J- ⁇ intronic enhancer (Hayday et al. (1984) Nature 307: 334) can be isolated as a 1.4 kb Mlul/HindIII fragment (see, infra).
  • Addition of a transcriptionally active xenoenhancer to a transgene such as a combined xenoenhancer consisting essentially of a human J- ⁇ intronic enhancer linked in cis to a mouse J- ⁇ intronic enhancer, can confer high levels of expression of the transgene, especially where said transgene encodes a light chain, such as human ⁇ .
  • a rat 3' enhancer can be advantageously included in a minilocus construct capable of encoding a human heavy chain.
  • a preferred embodiment of the invention is an animal containing at least one, typically 2-10, and sometimes 25-50 or more copies of the transgene described in Example 12 (e.g., pHC1 or pHC2) bred with an animal containing a single copy of a light chain transgene described in Examples 5, 6, 8, or 14, and the offspring bred with the J H deleted animal described in Example 10. Animals are bred to homozygosity for each of these three traits.
  • Such animals have the following genotype: a single copy (per haploid set of chromosomes) of a human heavy chain unrearranged mini-locus (described in Example 12), a single copy (per haploid set of chromosomes) of a rearranged human ⁇ light chain construct (described in Example 14), and a deletion at each endogenous mouse heavy chain locus that removes all of the functional J H segments (described in
  • Example 10 Such animals are bred with mice that are
  • B cells will be monospecific with regards to human or mouse heavy chains because both endogenous mouse heavy chain gene copies are nonfunctional by virtue of the deletion spanning the J H region introduced as described in Example 9 and 12. Furthermore, a substantial fraction of the B cells will be monospecific with regards to the human or mouse light chains because expression of the single copy of the rearranged human ⁇ light chain gene will allelically and isotypically exclude the rearrangement of the endogenous mouse ⁇ and ⁇ chain genes in a significant fraction of B-cells.
  • the transgenic mouse of the preferred embodiment will exhibit immunoglobulin production with a significant repertoire, ideally substantially similar to that of a native mouse.
  • the total immunoglobulin levels will range from about 0.1 to 10 mg/ml of serum,
  • the adult mouse ratio of serum IgG to IgM is preferably about 10:1.
  • the IgG to IgM ratio will be much lower in the
  • spleen and lymph node B cells express exclusively human IgG protein.
  • the repertoire will ideally approximate that shown in a non-transgenic mouse, usually at least about 10% as high, preferably 25 to 50% or more.
  • immunoglobulins ideally IgG
  • 10 4 to 10 6 or more will be produced, depending primarily on the number of different V, J and D regions introduced into the mouse genome.
  • These immunoglobulins will typically recognize about one-half or more of highly antigenic proteins,
  • immunoglobulins will exhibit an affinity for preselected antigens of at least about 10 7 M -1 , preferably 10 8 M -1 to 10 9 M -1 or greater.
  • a heavy chain transgene having a predetermined repertoire may comprise, for example, human V H genes which are preferentially used in antibody responses to the predetermined antigen type in humans.
  • some V H genes may be excluded from a defined repertoire for various reasons (e.g., have a low likelihood of encoding high affinity V regions for the predetermined antigen; have a low propensity to undergo somatic mutation and affinity sharpening; or are immunogenic to certain humans).
  • gene segments may be readily identified, e.g. by hybridization or DNA sequencing, as being from a species of organism other than the transgenic animal.
  • transgenic animal of the invention other embodiments are defined by the disclosure herein and more particularly by the transgenes described in the Examples.
  • transgenic animal Four categories of transgenic animal may be defined:
  • Transgenic animals containing an unrearranged heavy and unrearranged light immunoglobulin transgene III Transgenic animal containing rearranged heavy and an unrearranged light immunoglobulin transgene, and IV. Transgenic animals containing rearranged heavy and rearranged light immunoglobulin transgenes.
  • transgenic animal Of these categories of transgenic animal, the preferred order of preference is as follows II > I > III > IV where the endogenous light chain genes (or at least the ⁇ gene) have been knocked out by homologous recombination (or other method) and I > II > III >IV where the endogenous light chain genes have not been knocked out and must be dominated by allelic exclusion.
  • mice are derived according to Hogan, et al., "Manipulating the Mouse Embryo: A Laboratory Manual",
  • Embryonic stem cells are manipulated according to published procedures (Teratocarcinomas and embryonic stem cells: a practical approach, E.J. Robertson, ed., IRL Press, Washington, D.C., 1987; Zjilstra et al.. Nature 342:435-438 (1989); and Schwartzberg et al.. Science 246:799-803 (1989), each of which is incorporated herein by reference).
  • DNA cloning procedures are carried out according to J. Sambrook, et al. in Molecular Cloning: A Laboratory
  • Oligonucleotides are synthesized on an Applied Bio Systems oligonucleotide synthesizer according to
  • Hybridoma cells and antibodies are manipulated according to "Antibodies: A Laboratory Manual”, Ed Harlow and David Lane, Cold Spring Harbor Laboratory (1988), which is incorporated herein by reference.
  • Nuclei are isolated from fresh human placental tissue as described by Marzluff et al., "Transcription and Translation: A Practical Approach", B.D. Hammes and
  • the isolated nuclei (or PBS washed human spermatocytes) are embedded in a low melting point agarose matrix and lysed with EDTA and proteinase ⁇ to expose high molecular weight DNA, which is then digested in the agarose with the restriction enzyme NotI as described by M. Finney in Current Protocols in Molecular Biology (F. Ausubel, et al., eds. John Wiley & Sons, Supp. 4, 1988, Section 2.5.1).
  • the NotI digested DNA is then fractionated by pulsed field gel electrophoresis as described by Anand et al.,
  • Plasmid pYACNN is prepared by digestion of pYAC-4 Neo (Cook et al., Nucleic Acids Res. 16: 11817 (1988)) with EcoRI and ligation in the presence of the oligonucleotide 5' - AAT TGC GGC CGC - 3'.
  • the cloned NotI insert is isolated from high molecular weight yeast DNA by pulse field gel electrophoresis as described by M. Finney, op cit. The DNA is condensed by the addition of 1 mM spermine and microinjected directly into the nucleus of single cell embryos previously described.
  • the 450 kb XhoI to NotI fragment plus the approximately 400 kb Mlul to BssHII fragment have sequence overlap defined by the BssHII and XhoI restriction sites. Homologous recombination of these two fragments upon
  • microinjection of a mouse zygote results in a transgene containing at least an additional 15-20 V segments over that found in the 450 kb XhoI/NotI fragment (Example 2).
  • pBR322 is digested with EcoRI and StyI and ligated with the following oligonucleotides to generate pGP1 which contains a 147 base pair insert containing the restriction sites shown in Fig. 8. The general overlapping of these oligos is also shown in Fig. 9.
  • oligonucleotides are:
  • AAA AGC CCG CTC ATT AGG CGG GCT - 3'
  • This plasmid contains a large polylinker flanked by rare cutting NotI sites for building large inserts that can be isolated from vector sequences for microinjection.
  • the plasmid is based on pBR322 which is relatively low copy compared to the pUC based plasmids (pGP1 retains the pBR322 copy number control region near the origin of replication). Low copy number reduces the potential toxicity of insert sequences.
  • pGP1 contains a strong transcription terminator sequence derived from trpA (Christie et al., Proc. Natl. Acad. Sci. USA 78:4180 (1981)) inserted between the ampicillin resistance gene and the polylinker. This further reduces the toxicity associated with certain inserts by preventing readthrough transcription coming from the
  • ampicillin promoters are ampicillin promoters.
  • Plasmid pGP2 is derived from pGP1 to introduce an additional restriction site (SfiI) in the polylinker.
  • pGP1 is digested with Mlul and Spel to cut the recognition sequences in the polylinker portion of the plasmid.
  • a 3' pGP2 is identical to pGP1 except that it contains an additional Sfi I site located between the Mlul and SpeI sites. This allows inserts to be completely excised with SfiI as well as with NotI.
  • rat IGH 3' enhancer sequence is PCR amplified by using the following oligonucleotides:
  • pGP1 is digested with BamHI and BglII followed by treatment with calf intestinal alkaline phosphatase.
  • Fragments (a) and (b) from Fig. 9 are cloned in the digested pGP1.
  • a clone is then isolated which is oriented such that 5' BamHI site is destroyed by BamHI/Bgl fusion. It is identified as pMU (see Fig. 10).
  • pMU is digested with BamHI and fragment (c) from Fig. 9 is inserted.
  • the resultant plasmid pHIG1 (Fig. 10) contains an 18 kb insert encoding J and C ⁇ segments. D. Cloning of Cu Region
  • pGP1 is digested with BamHI and HindIII is followed by treatment with calf intestinal alkaline phosphatase (Fig. 14) .
  • the so treated fragment (b) of Fig. 14 and fragment (c) of Fig. 14 are cloned into the BamHI/HindIII cut pGP1.
  • Proper orientation of fragment (c) is checked by HindIII digestion to form pCON1 containing a 12 kb insert encoding the C ⁇ region.
  • pHIG1 contains J segments, switch and ⁇ sequences in its 18 kb insert with an SfiI 3' site and a Spel 5' site in a polylinker flanked by NotI sites, will be used for rearranged VDJ segments.
  • pCONl is identical except that it lacks the J region and contains only a 12 kb insert. The use of pCONl in the construction of fragment containing rearranged VDJ segments will be described hereinafter.
  • An intronic sequence is a nucleotide sequence of at least 15 contiguous nucleotides that occurs in an intron of a specified gene.
  • Phage clones containing the ⁇ -1 region are identified and isolated using the following oligonucleotide which is specific for the third exon of ⁇ -I (CH3).
  • a 7.7 kb HindIII to BglII fragment (fragment (a) in Fig. 11) is cloned into HindIII/BglII cut pRE3 to form pREG1.
  • the upstream 5.3 kb HindIII fragment (fragment (b) in Fig. 11) is cloned into HindIII digested pREG1 to form pREG2. Correct orientation is confirmed by BamHI/Spel digestion.
  • the previously described plasmid pHIG1 contains human J segments and the C ⁇ constant region exons.
  • pHIG1 was digested with SfiI (Fig. 10).
  • the plasmid pREG2 was also digested with SfiI to produce a 13.5 kb insert containing human C ⁇ exons and the rat 3' enhancer sequence. These sequences were combined to produce the plasmid pHIG3' (Fig. 12) containing the human J segments, the human C ⁇ constant region, the human C ⁇ 1 constant region and the rat 3' enhancer contained on a 31.5 kb insert.
  • a second plasmid encoding human C ⁇ and human C ⁇ 1 without J segments is constructed by digesting pCONl with SfiI and combining that with the SfiI fragment containing the human C ⁇ region and the rat 3' enhancer by digesting pREG2 with SfiI.
  • the resultant plasmid, pCON (Fig. 12) contains a 26 kb NotI/Spel insert containing human C ⁇ , human ⁇ 1 and the rat 3' enhancer sequence.
  • Fig. 13 Phage clones from the human genomic library containing D segments are identified and isolated using probes specific for diversity region sequences (Ichihara et al., EMBO J. 7:4141-4150 (1988)). The following
  • oligonucleotides are used:
  • DXP1 5' - TGG TAT TAC TAT GGT TCG GGG AGT TAT TAT
  • AAC CAC AGT GTC - 3' DXP4 5' - GCC TGA AAT GGA GCC TCA GGG CAC AGT GGG
  • DN4 5' - GCA GGG AGG ACA TGT TTA GGA TCT GAG GCC GCA CCT GAC ACC - 3'
  • a 5.2 kb XhoI fragment (fragment (b) in Fig. 13) containing DLR1, DXP1 , DXP'1, and DA1 is isolated from a phage clone identified with oligo DXP1.
  • a 3.2 kb Xbal fragment (fragment (c) in Fig. 13) containing DXP4, DA4 and DK4 is isolated from a phage clone identified with oligo DXP4.
  • This plasmid contains diversity segments cloned into the polylinker with a unique 5' SfiI site and unique 3' Spel site. The entire polylinker is flanked by NotI sites.
  • a restriction map of the unrearranged V segment is determined to identify unique restriction sites which provide upon digestion a DNA fragment having a length approximately 2 kb containing the unrearranged V segment together with 5' and 3' flanking sequences.
  • the 5' prime sequences will include promoter and other regulatory sequences whereas the 3' flanking sequence provides recombination sequences necessary for V-DJ joining.
  • This approximately 3.0 kb V segment insert is cloned into the polylinker of pGB2 to form pVH1.
  • pVH1 is digested with SfiI and the resultant
  • pHIG5' Since pHIG2 contains D segments only, the resultant pHIG5' plasmid contains a single V segment together with D segments.
  • the size of the insert contained in pHIG5 is 10.6 kb plus the size of the V segment insert.
  • pHIG5 The insert from pHIG5 is excised by digestion with NotI and Spel and isolated.
  • pHIG3' which contains J, C ⁇ and C ⁇ 1 segments is digested with SpeI and NotI and the 3' kb fragment containing such sequences and the rat 3' enhancer sequence is isolated. These two fragments are combined and ligated into NotI digested pGP1 to produce pHIG which contains insert encoding a V segment, nine D segments, six functional J segments, C ⁇ , C ⁇ and the rat 3' enhancer.
  • the size of this insert is approximately 43 kb plus the size of the V segment insert.
  • the insert of pHIG is approximately 43 to 45 kb when a single V segment is employed. This insert size is at or near the limit of that which may be readily cloned into plasmid vectors.
  • the following describes in vivo homologous recombination of overlapping DNA fragments which upon homologous recombination within a zygote or ES cell form a transgene containing the rat 3' enhancer sequence, the human C ⁇ , the human C ⁇ 1, human J segments, human D segments and a multiplicity of human V segments.
  • the resultant is plasmid designated pHIG5'0 (overlap) .
  • the insert contained in this plasmid contains human V, D and J segments. When the single V segment from pVHl is used, the size of this insert is approximately 17 kb plus 2 kb.
  • This insert is isolated and combined with the insert from pHIG3' which contains the human J, C ⁇ , ⁇ 1 and rat 3' enhancer sequences. Both inserts contain human J segments which provide for approximately 6.3 kb of overlap between the two DNA fragments.
  • pHIG5'0 overlap
  • This approach provides for the addition of a
  • multiplicity of V segments into the transgene formed in vivo For example, instead of incorporating a single V segment into pHIG5', a multiplicity of V segments contained on (1) isolated genomic DNA, (2) ligated DNA derived from genomic DNA, or (3) DNA encoding a synthetic V segment repertoire is cloned into pHIG2 at the SfiI site to generate pHIGS' V N . The J segments fragment (a) of Fig. 9 is then cloned into pHIG5' V N and the insert isolated. This insert now contains a multiplicity of V segments and J segments which overlap with the J segments contained on the insert isolated from pHIG3'.
  • pEu1 The construction of pEu1 is depicted in Fig. 16.
  • the mouse heavy chain enhancer is isolated on the Xbal to
  • This E ⁇ fragment is cloned into EcoRV/Xbal digested pGP1 by blunt end filling in EcoRI site.
  • the resultant plasmid is designated pEmul.
  • the ⁇ construct contains at least one human V ⁇ segment, all five human J ⁇ segments, the human J-C ⁇ enhancer, human ⁇ constant region exon, and, ideally, the human 3' ⁇ enhancer (Meyer et al., EMBO J. 8:1959-1964 (1989)).
  • the ⁇ enhancer in mouse is 9 kb downstream from C ⁇ . However, it is as yet unidentified in the human.
  • the construct contains a copy of the mouse heavy chain J-C ⁇ enhancers.
  • the minilocus is constructed from four component fragments:
  • the 16 kb fraction is isolated from the SmaI digested gel and the 11 kb region is similarly isolated from the gel containing DNA digested with BamHI.
  • the 16 kb SmaI fraction is cloned into Lambda FIX II (Stratagene, La Jolla, California) which has been digested with XhoI, treated with klenow fragment DNA polymerase to fill in the XhoI restriction digest product. Ligation of the 16 kb SmaI fraction destroys the SmaI sites and lases XhoI sites intact.
  • the 11 kb BamHI fraction is cloned into ⁇ EMBL3 (Strategene, La Jolla, California) which is digested with BamHI prior to cloning.
  • the above C ⁇ specific oligonucleotide is used to probe the ⁇ EMBL3/BamHI library to identify an 11 kb clone.
  • a 5 kb SmaI fragment fragment (b) in Fig. 20) is subcloned and subsequently inserted into pKapl digested with SmaI.
  • Those plasmids containing the correct orientation of J segments, C ⁇ and the E ⁇ enhancer are designated pKap2.
  • V ⁇ segments are thereafter subcloned into the Mlul site of pKap2 to yield the plasmid pKapH which encodes the human V ⁇ segments, the human J ⁇ segments, the human C ⁇ segments and the human E ⁇ enhancer.
  • This insert is excised by digesting pKapH with NotI and purified by agarose gel electrophoresis. The thus purified insert is
  • the 11 kb BamHI fragment is cloned into BamHI digested pGP1 such that the 3' end is toward the SfiI site.
  • the resultant plasmid is designated pKAPint.
  • One or more V ⁇ segments is inserted into the polylinker between the BamHI and Spel sites in pKAPint to form pKapHV.
  • the insert of pKapHV is excised by digestion with NotI and purified.
  • the insert from pKap2 is excised by digestion with NotI and purified.
  • Each of these fragments contain regions of homology in that the fragment from pKapHV contains a 5 kb sequence of DNA that include the J ⁇ segments which is substantially homologous to the 5 kb SmaI fragment contained in the insert obtained from pKap2.
  • these inserts are capable of homologously recombining when microinjected into a mouse zygote to form a transgene encoding V ⁇ , J ⁇ and C ⁇ .
  • Immunoglobulin ⁇ Light Chain Genes This example describes the cloning of immunoglobulin ⁇ light chain genes from cultured cells that express an immunoglobulin of interest. Such cells may contain multiple alleles of a given immunoglobulin gene. For example, a hybridoma might contain four copies of the ⁇ light chain gene, two copies from the fusion partner cell line and two copies from the original B-cell expressing the immunoglobulin of interest. Of these four copies, only one encodes the
  • immunoglobulin of interest despite the fact that several of them may be rearranged.
  • the procedure described in this example allows for the selective cloning of the expressed copy of the ⁇ light chain.
  • RNA is then used for the synthesis of oligo dT primed cDNA using the enzyme reverse transcriptase (for general methods see. Goodspeed et al.
  • the single stranded cDNA is then isolated and G residues are added to the 3' end using the enzyme
  • single-stranded cDNA is then purified and used as template for second strand synthesis (catalyzed by the enzyme DNA
  • the double stranded cDNA is isolated and used for determining the nucleotide sequence of the 5' end of the mRNAs encoding the heavy and light chains of the expressed
  • the double stranded cDNA described in part A is denatured and used as a template for a third round of DNA synthesis using the following oligonucleotide primer:
  • This primer contains sequences specific for the constant portion of the ⁇ light chain message (TCA TCA GAT GGC
  • GGG AAG ATG AAG ACA GAT GGT GCA GGG AAG ATG AAG ACA GAT GGT GCA
  • unique sequences that can be used as a primer for the PCR amplification of the newly synthesized DNA strand
  • AAG AAG
  • the sequence is amplified by PCR using the following two oligonucleotide primers:
  • the first 42 nucleotides of sequence will then be used to synthesize a unique probe for isolating the gene from which immunoglobulin message was transcribed.
  • This synthetic 42 nucleotide segment of DNA will be referred to below as o-kappa.
  • a unique restriction endonuclease site is identified upstream of the rearranged V segment.
  • DNA from the Ig expressing cell line is then cut with SmaI and second enzyme (or BamHI or Kpnl if there is SmaI site inside V segment). Any resulting non-blunted ends are treated with the enzyme T4 DNA polymerase to give blunt ended DNA molecules. Then add restriction site encoding linkers (BamHI, EcoRI or XhoI depending on what site does not exist in fragment) and cut with the corresponding linker enzyme to give DNA fragments with BamHI, EcoRI or XhoI ends.
  • SmaI and second enzyme or BamHI or Kpnl if there is SmaI site inside V segment. Any resulting non-blunted ends are treated with the enzyme T4 DNA polymerase to give blunt ended DNA molecules. Then add restriction site encoding linkers (BamHI, EcoRI or XhoI depending on what site does not exist in fragment) and cut with the corresponding linker enzyme to give DNA fragments with BamHI, EcoRI or XhoI ends.
  • V segment containing clones are isolated using the unique probe o-kappa. DNA is isolated from positive clones and subcloned into the polylinker of pKapl. The resulting clone is called pRKL.
  • This example describes the cloning of immunoglobulin heavy chain ⁇ genes from cultured cells of expressed and immunoglobulin of interest. The procedure described in this example allows for the selective cloning of the expressed copy of a ⁇ heavy chain gene.
  • Double-stranded cDNA is prepared and isolated as described herein before.
  • the double-stranded cDNA is
  • This primer contains sequences specific for the constant portion of the ⁇ heavy chain message (ACA GGA GAC GAG GGG GAA AAG GGT TGG GGC GGA TGC) as well as unique sequences that can be used as a primer for the PCR amplification of the newly synthesized DNA strand (GTA CGC CAT ATC AGC TGG ATG AAG) .
  • the sequence is amplified by PCR using the following two oligonucleotide primers: 5' - GAG GTA CAC TGA CAT ACT GGC ATG - 3'
  • PCR amplified sequence is then purified by gel electrophoresis and used as template for dideoxy sequencing reactions using the following oligonucleotide as a primer:
  • the first 42 nucleotides of sequence are then used to synthesize a unique probe for isolating the gene from which immunoglobulin message was transcribed.
  • This synthetic 42 nucleotide segment of DNA will be referred to below as o-mu.
  • Mlul is a rare cutting enzyme that cleaves between the J segment and mu CH1
  • restriction endonuclease site is identified upstream of the rearranged V segment.
  • DNA from the Ig expressing cell line is then cut with Mlul and second enzyme.
  • Mlul or Spel adapter linkers are then ligated onto the ends and cut to convert the upstream site to Mlul or Spel.
  • the DNA is then size fractionated by agarose gel electrophoresis, and the fraction including the DNA fragment covering the expressed V segment is cloned directly into the plasmid pGPI.
  • V segment containing clones are isolated using the unique probe o-mu, and the insert is subcloned into MluI or MluI/Spel cut plasmid pCON2. The resulting plasmid is called pRMGH.
  • a human genomic DNA phage library was screened with kappa light chain specific oligonucleotide probes and isolated clones spanning the J ⁇ -C region.
  • a 5.7 kb ClaI/XhoI fragment containing J ⁇ 1 together with a 13 kb XhoI fragment containing J ⁇ 2-5 and C ⁇ into pGP1d was cloned and used to create the plasmid pKcor. This plasmid contains J ⁇ 1-5, the kappa
  • a human genomic DNA phage library was screened with
  • V ⁇ light chain specific oligonucleotide probes and isolated clones containing human V ⁇ segments. Functional V segments were identified by DNA sequence analysis. These clones contain TATA boxes, open reading frames encoding leader and variable peptides (including 2 cysteine residues), splice sequences, and recombination heptamer-12 bp spacer-nonamer sequences. Three of the clones were mapped and sequenced.
  • Two of the clones, 65.5 and 65.8 appear to be functional, they contain TATA boxes, open reading frames encoding leader and variable peptides (including 2 cysteine residues), splice sequences, and recombination heptamer-12 bp spacer-nonamer sequences.
  • the third clone, 65.4 appears to encode a V ⁇ I pseudogene as it contains a non-canonical recombination heptamer.
  • Vk 65-8 which encodes a VkIII family gene, was used to build a light chain minilocus construct.
  • the kappa light chain minilocus transgene pKC1 (Fig. 32) was generated by inserting a 7.5 kb XhoI/SalI fragment containing V ⁇ 65.8 into the 5' XhoI site of pKcor.
  • the transgene insert was isolated by digestion with NotI prior to injection.
  • the purified insert was microinjected into the pronuclei of fertilized (C57BL/6 ⁇ CBA)F2 mouse embryos and transferred the surviving embryos into pseudopregnant females as described by Hogan et al. (in Methods of Manipulating the Mouse Embryo, 1986, Cold Spring Harbor Laboratory, New York). Mice that developed from injected embryos were analyzed for the presence of transgene sequences by Southern blot analysis of tail DNA. Transgene copy number was estimated by band intensity relative to control standards containing known quantities of cloned DNA.
  • Serum was isolated from these animals and assayed for the presence of transgene encoded human Ig kappa protein by ELISA as described by Harlow and Lane (in Antibodies: A Laboratory Manual, 1988, Cold Spring Harbor Laboratory, New York) .
  • Microtiter plate wells were coated with mouse monoclonal antibodies specific for human Ig kappa (clone 6E1, #0173, AMAC, Inc., Westbrook, ME), human IgM (Clone AF6, #0285, AMAC, Inc., Westbrook, ME) and human IgG1 (clone JL512, #0280, AMAC, Inc., Westbrook, ME).
  • Serum samples were serially diluted into the wells and the presence of specific immunoglobulins detected with affinity isolated alkaline phosphatase conjugated goat anti-human Ig (polyvalent) that had been pre-adsorbed to minimize cross-reactivity with mouse immunoglobulins.
  • Fig. 35 shows the results of an ELISA assay of serum from 8 mice (I.D. #676, 674, 673, 670, 666, 665, 664, and 496). The first seven of these mice developed from embryos that were injected with the pKC1 transgene insert and the eighth mouse is derived from a mouse generated by
  • mice from KC1 injected embryos Two of the seven mice from KC1 injected embryos (I.D.#'s 666 and 664) did not contain the transgene insert as assayed by DAN Southern blot analysis, and five of the mice (I.D.#'s 676, 674, 673, 670, and 665) contained the transgene. All but one of the KC1 transgene positive animals express detectable levels of human Ig kappa protein, and the single non-expressing animal appears to be a genetic mosaic on the basis of DNA Southern blot analysis. The pHC1 positive transgenic mouse expresses human IgM and IgG1 but not Ig kappa,
  • the kappa light chain minilocus transgene pKC2 was generated by inserting an 8 kb XhoI/SalI fragment containing V ⁇ 65.5 into the 5' XhoI site of pKC1. The resulting
  • transgene insert which contains two V ⁇ segments, was isolated prior to microinjection by digestion with NotI.
  • This construct is identical to pKC1 except that it includes 1.2 kb of additional sequence 5' of J ⁇ and is missing 4.5 kb of sequence 3' of V ⁇ 65.8. In additional it contains a 0.9 kb Xbal fragment containing the mouse heavy chain J- ⁇ intronic enhancer (Banerji et al., Cell 33:729-740 (1983)) together with a 1.4 kb MluI/HindIII fragment containing the human heavy chain J- ⁇ intronic enhancer (Hayday et al., Nature 307:334-340 (1984)) inserted downstream.
  • This construct tests the feasibility of initiating early rearrangement of the light chain minilocus to effect allelic and isotypic exclusion. Analogous constructs can be generated with different
  • enhancers i.e., the mouse or rat 3' kappa or heavy chain enhancer (Meyer and Neuberger, EMBO J. 8:1959-1964 (1989);
  • a kappa light chain expression cassette was designed to reconstruct functionally rearranged light chain genes that have been amplified by PCR from human B-cell DNA.
  • the scheme is outlined in Fig. 33.
  • PCR amplified light chain genes are cloned into the vector pK5nx that includes 3.7 kb of 5' flanking sequences isolated from the kappa light chain gene 65.5.
  • the VJ segment fused to the 5' transcriptional
  • sequences are then cloned into the unique XhoI site of the vector pK31s that includes J ⁇ 2-4, the J ⁇ intronic enhancer, C ⁇ , and 9 kb of downstream sequences.
  • the resulting plasmid contains a reconstructed functionally rearranged kappa light chain transgene that can be excised with NotI for
  • the plasmids also contain unique SalI sites at the 3' end for the insertion of additional cis-acting regulatory sequences.
  • Oligonucleotide o-131 (gga ccc aga
  • Oligonucleotide o-130 (gtg caa tea att etc gag ttt gac tac aga c) is complementary to a sequence approximately 150 bp 3' of J ⁇ 1 and includes an XhoI site. These two oligonucleotides amplify a 0.7 kb DNA
  • the PCR amplified DNA was digested with NcoI and XhoI and cloned individual PCR products into the plasmid pNN03.
  • the DNA sequence of 5 clones was determined and identified two with functional VJ joints (open reading frames). Additional functionally rearranged light chain clones are collected. The functionally rearranged clones can be individually cloned into light chain expression
  • Transgenic mice generated with the rearranged light chain constructs can be bred with heavy chain minilocus transgenics to produce a strain of mice that express a spectrum of fully human antibodies in which all of the diversity of the primary repertoire is contributed by the heavy chain.
  • One source of light chain diversity can be from somatic mutation. Because not all light chains will be equivalent with respect to their ability to combine with a variety of different heavy chains, different strains of mice, each containing different light chain constructs can be generated and tested.
  • the advantage of this scheme, as opposed to the use of unrearranged light chain miniloci is the increased light chain allelic and isotypic exclusion that comes from having the light chain ready to pair with a heavy chain as soon as heavy chain VDJ joining occurs. This
  • combination can result in an increased frequency of B-cells expressing fully human antibodies, and thus it can facilitate the isolation of human Ig expressing hybridomas.
  • NotI inserts of plasmids pIGM1, pHC1, pIGG1, pKC1, and pKC2 were isolated away from vector sequences by agarose gel electrophoresis. The purified inserts were microinjected into the pronuclei of fertilized (C57BL/6 ⁇ CBA)F2 mouse embryos and transferred the surviving embryos into
  • pseudopregnant females as described by Hogan et al. (Hogan et al.. Methods of Manipulating the Mouse Embryo. Cold Spring Harbor Laboratory, New York (1986)).
  • This example describes the inactivation of the mouse endogenous kappa locus by homologous recombination in
  • ES embryonic stem
  • blastocysts early mouse embryos
  • the plasmid pGEM7 contains the neomycin resistance gene (neo), used for drug selection of transfected ES cells, under the transcriptional control of the mouse phosphoglycerate kinase (pgk) promoter (XbaI/TaqI fragment; Adra et al. (1987) Gene 60: 65) in the cloning vector pGEM-7Zf(+).
  • the plasmid also includes a heterologous
  • Fig. 20a Mouse kappa chain sequences (Fig. 20a) were isolated from a genomic phage library derived from liver DNA using oligonucleotide probes specific for the C ⁇ locus: 5'- GGC TGA TGC TGC ACC AAC TGT ATC CAT CTT CCC ACC ATC CAG -3' and for the J ⁇ 5 gene segment: 5'- CTC ACG TTC GGT GCT GGG ACC AAG CTG GAG CTG AAA CGT AAG -3 ' .
  • a 1.2 kb EcoRI/SphI fragment extending 5' of the J ⁇ region was also isolated from a positive phage clone.
  • An SphI/Xbal/BglII/EcoRI adaptor was ligated to the SphI site of this fragment, and the resulting EcoRI fragment was ligated into EcoRI digested pNEO-K3', in the same 5' to 3' orientation as the neo gene and the downstream 3' kappa sequences, to generate pNEO-K5'3' (Fig. 20c).
  • HSV Herpes Simplex Virus
  • TK thymidine kinase gene
  • the HSV TK cassette was obtained from the plasmid pGEM7 (TK), which contains the structural sequences for the HSV TK gene bracketed by the mouse pgk promoter and polyadenylation sequences as described above for pGEM7 (KJ1).
  • telomere sequence was modified to a BamHI site and the TK cassette was then excised as a BamHI/HindIII fragment and subcloned into pGP1b to generate pGP1b-TK.
  • This plasmid was linearized at the XhoI site and the XhoI fragment from pNEO-K5'3', containing the neo gene flanked by genomic sequences from 5' of J ⁇ and 3' of C ⁇ , was inserted into pGP1b-TK to generate the targeting vector J/C KI (Fig. 20d).
  • the putative structure of the genomic kappa locus following homologous recombination with J/C K1 is shown in Fig. 20e. Generation and analysis of ES cells with targeted inactivation of a kappa allele
  • ES cells used were the AB-1 line grown on mitotically inactive SNL76/7 cell feeder layers (McMahon and Bradley, Cell 62:1073-1085 (1990)) essentially as described (Robertson, E.J. (1987) in Teratocarcinomas and Embryonic Stem Cells: A Practical Approach. E.J. Robertson, ed. (Oxford: IRL Press), p. 71-112).
  • Other suitable ES lines include, but are not limited to, the E14 line (Hooper et al. (1987) Nature 326: 292-295), the D3 line (Doetschman et al. (1985) J. Embryol. EXP. Morph. 87: 27-45), and the CCE line (Robertson et al.
  • the pluripotence of any given ES cell line can vary with time in culture and the care with which it has been handled.
  • the only definitive assay for pluripotence is to determine whether the specific population of ES cells to be used for targeting can give rise to chimeras capable of germline transmission of the ES genome. For this reason, prior to gene targeting, a portion of the parental population of AB-1 cells is injected into C57B1/6J blastocysts to
  • the kappa chain inactivation vector J/C K1 was digested with NotI and electroporated into AB-1 cells by the methods described (Hasty et al., Nature, 350:243-246 (1991)). Electroporated cells were plated onto 100 mm dishes at a density of 1-2 ⁇ 10 6 cells/dish. After 24 hours, G418
  • DNA analysis was carried out by Southern blot hybridization. DNA was isolated from the clones as described (Laird et al., Nucl. Acids Res. 19:4293 (1991)) digested with Xbal and probed with the 800 bp EcoRI/Xbal fragment indicated in Fig. 20e as probe A. This probe detects a 3.7 kb Xbal fragment in the wild type locus, and a diagnostic 1.8 kb band in a locus which has homologously recombined with the
  • ⁇ displayed the 1.8 kb Xbal band indicative of a homologous recombination into one of the kappa genes.
  • These ⁇ clones were further digested with the enzymes BglII, Sacl, and Pstl to verify that the vector integrated homologously into one of the kappa genes.
  • the AB1 ES cells are an XY cell line and a majority of these high percentage chimeras were male due to sex conversion of female embryos colonized by male ES cells.
  • Male chimeras derived from 4 of the 5 targeted clones were bred with C57BL/6J females and the offspring monitored for the presence of the dominant agouti coat color indicative of germline transmission of the ES genome.
  • heterozygotes were bred together and the kappa genotype of the offspring determined as described above.
  • three genotypes were derived from the heterozygote matings: wild-type mice bearing two copies of a normal kappa locus, heterozygotes carrying one targeted copy of the kappa gene and one NT kappa gene, and mice homozygous for the kappa mutation.
  • the deletion of kappa sequences from these latter mice was verified by hybridization of the Southern blots with a probe specific for J ⁇ (probe C, Fig. 20a).
  • This example describes the inactivation of the endogenous murine immunoglobulin heavy chain locus by
  • homologous recombination in embryonic stem (ES) cells The strategy is to delete the endogenous heavy chain J segments by homologous recombination with a vector containing heavy chain seguences from which the J H region has been deleted and replaced by the gene for the selectable marker neo.
  • the neomycin resistance gene (neo) used for drug selection of transfected ES cells, was derived from a repaired version of the plasmid pGEM7 (KJ1).
  • KJ1 neomycin resistance gene
  • restriction fragment encompassing the mutation with the corresponding sequence from a wild-type neo clone.
  • HindIII site in the prepared pGEM7 (KJ1) was converted to a SalI site by addition of a synthetic adaptor, and the neo expression cassette excised by digestion with Xbal/SalI. The ends of the neo fragment were then blunted by treatment with the Klenow form of DNA polI, and the neo fragment was
  • pGP1b was digested with the restriction enzyme NotI and ligated with the following oligonucleotide as an adaptor: 5'- GGC CGC TCG ACG ATA GCC TCG AGG CTA TAA ATC TAG AAG AAT TCC AGC AAA GCT TTG GC -3'
  • pGMT mouse immunoglobulin heavy chain targeting
  • the Herpes Simplex Virus (HSV) thymidine kinase (TK) gene was included in the construct in order to allow for enrichment of ES clones bearing homologous recombinants, as described by Mansour et al. (Nature 336, 348-352 (1988)).
  • the HSV TK gene was obtained from the plasmid pGEM7 (TK) by digestion with EcoRI and HindIII. The TK DNA fragment was subcloned between the EcoRI and HindIII sites of pGMT, creating the plasmid pGMT-TK (Fig. 21c).
  • a 5.9 kb genomic Xbal/XhoI fragment situated 5' of the J H region, was derived from a positive genomic phage clone by limit digestion of the DNA with XhoI, and partial digestion with Xbal.
  • this XbaI site is not present in genomic DNA, but is rather derived from phage sequences immediately flanking the cloned genomic heavy chain insert in the positive phage clone.
  • the fragment was
  • the final step in the construction involved the excision from pUC18 J H -neo of the 2.8 kb EcoRI fragment which contained the neo gene and flanking genomic sequences 3' of J H . This fragment was blunted by Klenow polymerase and subcloned into the similarly blunted XhoI site of
  • J H KO1 (Fig. 21e) contains 6.9 kb of genomic sequences flanking the J H locus, with a 2.3 kb deletion spanning the J H region into which has been inserted the neo gene.
  • Fig. 2If shows the structure of an endogenous heavy chain gene after homologous recombination with the targeting construct.
  • the heavy chain inactivation vector J H KO1 was digested with NotI and electroporated into AB-1 cells by the methods described (Hasty et al., Nature 350:243-246 (1991)). Electroporated cells were plated into 100 mm dishes at a density of 1-2 ⁇ 10 6 cells/dish. After 24 hours, G418
  • DNA analysis was carried out by Southern blot hybridization. DNA was isolated from the clones as described (Laird et al. (1991) Nucleic Acids Res. 19: 4293), digested with Stul and probed with the 500 bp EcoRI/StuI fragment designated as probe A in Fig. 2If. This probe detects a Stul fragment of 4.7 kb in the wild-type locus, whereas a 3 kb band is diagnostic of homologous recombination of endogenous sequences with the targeting vector (see Fig. 21a and f).
  • agouti offspring Since only one copy of the heavy chain locus was targeted in the injected ES clones, each agouti pup had a 50 percent chance of inheriting the mutated locus. Screening for the targeted gene was carried out by Southern blot analysis of Stul-digested DNA from tail
  • heterozygotes were bred together and the heavy chain genotype of the offspring determined as described above.
  • three genotypes were derived from the heterozygote matings: wild-type mice bearing two copies of the normal J H locus, heterozygotes carrying one targeted copy of the gene and one normal copy, and mice homozygous for the J H mutation. The absence of J H sequences from these latter mice was
  • the plasmid pBR322 was digested with EcoRI and StyI and ligated with the following oligonucleotides: oligo-42 5'- caa gag ccc gcc taa tga gcg ggc ttt ttt ttg cat act gcg gcc get -3'
  • oligo-43 5'- aat tag egg ccg cag tat gca aaa aaa age ccg etc att agg egg get -3'
  • the resulting plasmid, pGP1a is designed for
  • This termination signal reduces the potential toxicity of coding sequences inserted into the NotI site by eliminating readthrough transcription from the AmpR gene.
  • this plasmid is low copy relative to the pUC plasmids because it retains the pBR322 copy number control region. The low copy number further
  • the vectors pGP1b, pGP1c, pGP1d, and pGP1f are derived from pGP1a and contain different polylinker cloning sites.
  • the polylinker sequences are given below pGP1a
  • pGP1a was digested with NotI and ligated with the following oligonucleotides: oligo-47 5'- ggc cgc aag ctt act get gga tec tta att aat cga tag tga tct cga ggc -3'
  • oligo-48 5'- ggc cgc etc gag ate act ate gat taa tta agg ate cag cag taa get tgc -3'
  • the resulting plasmid, pGP1b contains a short polylinker region flanked by NotI sites. This facilitates the construction of large inserts that can be excised by NotI digestion.
  • oligonucleotides oligo-44 5'- etc cag gat cca gat ate agt ace tga aac agg get tgc -3'
  • oligo-45 5'- etc gag cat gca cag gac ctg gag cac aca cag cct tec -3' were used to amplify the immunoglobulin heavy chain 3'
  • pNN03 is a pUC derived plasmid that contains a polylinker with the following restriction sites, listed in order: NotI, BamHI, NcoI, ClaI, EcoRV, Xbal, Sacl, XhoI, SphI, Pstl, BglII, EcoRI, SmaI, KpnI, HindIII, and NotI).
  • the resulting plasmid, pRE3 was digested with BamHI and HindIII, and the insert containing the rat Ig heavy chain 3' enhancer cloned into BamHI/HindIII digested pGP1b.
  • the resulting plasmid, pGPe (Fig. 22 and Table 1), contains several unique restriction sites into which sequences can be cloned and subsequently excised together with the 3' enhancer by NotI digestion.
  • a 4 kb XhoI fragment was isolated from phage clone ⁇ 2.1 that contains sequences immediately downstream of the sequences in pJMl, including the so called ⁇ element involved in ⁇ -associated deleteon of the ⁇ in certain IgD expressing B-cells (Yasui et al., Eur. J. Immunol. 19:1399 (1989), which is incorporated herein by reference).
  • This fragment was treated with the Klenow fragment of DNA polymerase I and ligated to XhoI cut, Klenow treated, pJM1.
  • the resulting plasmid, pJM2 (Fig.
  • pJM2 contains the entire human J region, the heavy chain J- ⁇ intronic enhancer, the ⁇ switch region and all of the ⁇ constant region exons, as well as the two 0.4 kb direct repeats, ⁇ and ⁇ , involved in ⁇ -associated deletion of the ⁇ gene. 3. Isolation of D region clones and construction of pDH1
  • oligonucleotide oligo-4 5'- tgg tat tac tat ggt teg ggg agt tat tat aac cac agt gtc -3' was used to screen the human placenta genomic library for D region clones. Phage clones ⁇ 4.1 and ⁇ 4.3 were isolated. A 5.5 kb XhoI fragment, that includes the D elements D ⁇ 1 , D N1 , and D M2 (Ichihara et al., EMBO J. 7:4141 (1988)), was isolated from phage clone ⁇ 4.1.
  • pDH1 contains a 10.6 kb insert that includes at least ⁇ D segments and can be excised with XhoI (5') and EcoRV (3'). 4.
  • the plasmid pJM2 was digested with Asp718 (an isoschizomer of Kpnl) and the overhang filled in with the Klenow fragment of DNA polymerase I. The resulting DNA was then digested with ClaI and the insert isolated. This insert was ligated to the XhoI/EcoRV insert of pDH1 and XhoI/ClaI digested pGPe to generate pCOR1 (Fig. 24).
  • plasmid pCOR1 was partially digested with XhoI and the isolated XhoI/SalI insert of pVH251 cloned into the upstream XhoI site to generate the plasmid pIGM1 (Fig. 25).
  • pIGM1 contains 2 functional human variable region segments, at least 8 human D segments all 6 human J H segments, the human
  • J- ⁇ enhancer the human ⁇ element, the human ⁇ switch region, all of the human ⁇ coding exons, and the human ⁇ element, together with the rat heavy chain 3' enhancer, such that all of these sequence elements can be isolated on a single
  • oligonucleotide specific for human Ig g constant region genes: oligo-29 5'- cag cag gtg cac ace caa tgc cca tga gcc cag aca ctg gac -3' was used to screen the human genomic library. Phage clones 129.4 and ⁇ 29.5 were isolated. A 4 kb HindIII fragment of phage clone ⁇ 29.4, containing a ⁇ switch region, was used to probe a human placenta genomic DNA library cloned into the phage vector lambda FIXTM II (Stratagene, La Jolla, CA). Phage clone ⁇ Sg1.13 was isolated.
  • dideoxy sequencing reactions were carried out using subclones of each of the three phage clones as templates and the following oligonucleotide as a primer: oligo-67 5'- tga gcc cag aca ctg gac -3' Phage clones ⁇ 29.5 and ⁇ S ⁇ 1.13 were both determined to be of the ⁇ 1 subclass.
  • a 7.8 kb HindIII fragment of phage clone ⁇ 29.5, containing the ⁇ 1 coding region was cloned into pUC18.
  • the resulting plasmid, pLT1 was digested with XhoI, Klenow treated, and religated to destroy the internal XhoI site.
  • the resulting clone, pLT1xk was digested with HindIII and the insert isolated and cloned into pSP72 to generate the plasmid clone pLTlxks.
  • p ⁇ el contains all of the ⁇ 1 constant region coding exons, together with 5 kb of downstream sequences, linked to the rat heavy chain 3' enhancer.
  • a 5.3 kb HindIII fragment containing the ⁇ 1 switch region and the first exon of the pre-switch sterile transcript (P. Sideras et al. (1989) International Immunol. 1, 631) was isolated from phage clone ⁇ S ⁇ 1.13 and cloned into pSP72 with the polylinker XhoI site adjacent to the 5' end of the insert, to generate the plasmid clone PS ⁇ 1S.
  • the XhoI/SalI insert of PS ⁇ 1S was cloned into XhoI digested P ⁇ el to generate the plasmid clone P ⁇ e2 (Fig. 26).
  • P ⁇ e2 contains all of the ⁇ 1 constant region coding exons, and the upstream switch region and sterile transcript exons, together with 5 kb of downstream sequences, linked to the rat heavy chain 3' enhancer.
  • This clone contains a unique XhoI site at the 5' end of the insert. The entire insert, together with the XhoI site and the 3' rat enhancer can be excised from vector sequences by digestion with NotI. 4 .
  • pHC1 contains 2
  • constant region including the associated switch region and sterile transcript associated exons, together with the rat heavy chain 3' enhancer, such that all of these sequence elements can be isolated on a single fragment, away from vector sequences, by digestion with NotI and microinjected into mouse embryo pronuclei to generate transgenic animals.
  • Phage clone ⁇ 49.8 was isolated and a 6.1 kb Xbal fragment containing the variable segment VH49.8 subcloned into pNN03 (such that the polylinker ClaI site is downstream of VH49.8 and the polylinker XhoI site is upstream) to generate the plasmid pVH49.8.
  • An 800 bp region of this insert was sequenced, and VH49.8 found to have an open reading frame and intact splicing and recombination signals, thus indicating that the gene is functional (Table 2).
  • a 4 kb Xbal genomic fragment containing the human V H IV family gene V H 4-21 (Sanz et al., EMBO J., 8:3741 (1989)), subcloned into the plasmid pUC12, was excised with SmaI and HindIII, and treated with the Klenow fragment of polymerase I. The blunt ended fragment was then cloned into ClaI digested, Klenow treated, pVH49.8. The resulting plasmid, pV2, contains the human heavy chain gene VH49.8 linked upstream of VH4-21 in the same orientation, with a unique SalI site at the 3' end of the insert and a unique XhoI site at the 5' end.
  • sequences immediately upstream of, and adjacent to, the 5.3 kb ⁇ 1 switch region containing fragment in the plasmid P ⁇ e2) together with the neighboring upstream 3.1 kb Xbal fragment were isolated from the phage clone ⁇ Sg1.13 and cloned into HindIII/Xbal digested pUC18 vector.
  • the resulting plasmid, PS ⁇ 1-5' contains a 3.8 kb insert representing sequences upstream of the initiation site of the sterile transcript found in B-cells prior to switching to the ⁇ 1 isotype (P.
  • transgene constructs to promote correct expression of the sterile transcript and the associated switch
  • the PS ⁇ 1-5' insert was excised with SmaI and
  • the ligation product was digested with SalI and ligated to SalI digested pV2.
  • the resulting plasmid, pVP contains 3.8 kb of ⁇ 1 switch 5' flanking sequences linked downstream of the two human variable gene segments VH49.8 and VH4-21 (see Table 2).
  • the pVP insert is isolated by partial digestion with SalI and complete digestion with XhoI, followed by purification of the 15 kb fragment on an agarose gel. The insert is then cloned into the XhoI site of P ⁇ e2 to generate the plasmid clone.
  • pVGE1 (Fig. 27).
  • pVGE1 contains two human heavy chain variable gene segments upstream of the human ⁇ 1 constant gene and associated switch region.
  • a unique SalI site between the variable and constant regions can be used to clone in D, J, and ⁇ gene segments.
  • the rat heavy chain 3' enhancer is linked to the 3' end of the ⁇ 1 gene and the entire insert is flanked by NotI sites. 5.
  • the plasmid clone pVGE1 is digested with SalI and the XhoI insert of pIGM1 is cloned into it.
  • the resulting clone, pHC2 contains 4 functional human variable region segments, at least 8 human D segments all 6 human J H segments, the human J-m enhancer, the human ⁇ element, the human ⁇ switch region, all of the human ⁇ coding exons, the human ⁇ element, and the human ⁇ 1 constant region, including the associated switch region and sterile transcript associated exons, together with 4 kb flanking sequences upstream of the sterile transcript initiation site.
  • These human sequences are linked to the rat heavy chain 3* enhancer, such that all of the sequence elements can be isolated on a single fragment, away from vector sequences, by digestion with NotI and
  • transgenic mice A unique XhoI site at the 5' end of the insert can be used to clone in additional human variable gene segments to further expand the recombinational diversity of this heavy chain minilocus.
  • E. Transgenic mice A unique XhoI site at the 5' end of the insert can be used to clone in additional human variable gene segments to further expand the recombinational diversity of this heavy chain minilocus.
  • the NotI inserts of plasmids pIGM1 and pHC1 were isolated from vector sequences by agarose gel electrophoresis. The purified inserts were microinjected into the pronuclei of fertilized (C57BL/6 ⁇ CBA) F2 mouse embryos and transferred the surviving embryos into pseudopregnant females as described by Hogan et al. (B. Hogan, F. Costantini, and E. Lacy, Methods of Manipulating the Mouse Embryo, 1986, Cold Spring Harbor

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Abstract

L'invention concerne des animaux transgéniques capables de produire des anticorps hétérologues, ainsi que des procédés de production d'anticorps à séquences humaines se fixant à des antigènes humains avec une affinité sensible.
PCT/US1994/004580 1990-08-29 1994-04-25 Animaux transgeniques capables de produire des anticorps heterologues WO1994025585A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
JP6524481A JPH08509612A (ja) 1993-04-26 1994-04-25 異種抗体を産生することができるトランスジェニック非ヒト動物
EP94916581A EP0754225A4 (fr) 1993-04-26 1994-04-25 Animaux transgeniques capables de produire des anticorps heterologues
AU68194/94A AU6819494A (en) 1993-04-26 1994-04-25 Transgenic non-human animals capable of producing heterologous antibodies
CA2161351A CA2161351C (fr) 1993-04-26 1994-04-25 Animaux transgeniques, pouvant produire des anticorps heterologues
US08/544,404 US5770429A (en) 1990-08-29 1995-10-10 Transgenic non-human animals capable of producing heterologous antibodies
US11/009,840 US20060015949A1 (en) 1990-08-29 2004-12-10 Transgenic non-human animals for producing heterologous and chimeric antibodies
US11/009,769 US20060026703A1 (en) 1990-08-29 2004-12-10 Transgenic non-human animals for producing heterologous and chimeric antibodies
US11/009,873 US7501552B2 (en) 1991-08-28 2004-12-10 Transgenic non-human animals for producing chimeric antibodies

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US08/053,131 1993-04-26
US08/053,131 US5661016A (en) 1990-08-29 1993-04-26 Transgenic non-human animals capable of producing heterologous antibodies of various isotypes
US08/096,762 1993-07-22
US08/096,762 US5814318A (en) 1990-08-29 1993-07-22 Transgenic non-human animals for producing heterologous antibodies
US15530193A 1993-11-18 1993-11-18
US08/155,301 1993-11-18
US16173993A 1993-12-03 1993-12-03
US08/161,739 1993-12-03
US16569993A 1993-12-10 1993-12-10
US08/165,699 1993-12-10
US20974194A 1994-03-09 1994-03-09
US08/209,741 1994-03-09

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CA2161351A1 (fr) 1994-11-10
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