EP1254225A2 - Nouvelle famille de proteines, denommees atip, les sequences nucleiques codant pour lesdites proteines et leurs applications - Google Patents
Nouvelle famille de proteines, denommees atip, les sequences nucleiques codant pour lesdites proteines et leurs applicationsInfo
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- EP1254225A2 EP1254225A2 EP01907725A EP01907725A EP1254225A2 EP 1254225 A2 EP1254225 A2 EP 1254225A2 EP 01907725 A EP01907725 A EP 01907725A EP 01907725 A EP01907725 A EP 01907725A EP 1254225 A2 EP1254225 A2 EP 1254225A2
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- Prior art keywords
- sequence
- hatip
- seq
- protein
- sequences
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
- C12Q1/6883—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for diseases caused by alterations of genetic material
- C12Q1/6886—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for diseases caused by alterations of genetic material for cancer
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/46—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates
- C07K14/47—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals
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- 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
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- 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
- C07K16/22—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against growth factors ; against growth regulators
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
- A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K48/00—Medicinal preparations containing genetic material which is inserted into cells of the living body to treat genetic diseases; Gene therapy
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q2600/00—Oligonucleotides characterized by their use
- C12Q2600/156—Polymorphic or mutational markers
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q2600/00—Oligonucleotides characterized by their use
- C12Q2600/158—Expression markers
Definitions
- the present invention relates to a new family of human proteins (hATIP), interacting with the angiotensin II AT2 receptor and having an anti-oncogenic function. Said family of proteins is therefore useful for the diagnosis of cancerous and precancerous states and the treatment of cancerous states.
- hATIP human proteins
- the present invention also relates to the gene coding for said proteins as well as to transcripts and cDNA molecules coding for said proteins, to fragments of these different nucleic acid molecules and to their applications for detection and expression. of said proteins.
- the present invention also relates to nucleic sequences (genetic DNA, transcribed and cDNA) or proteins of the hATIP family, having an alteration or a functional mutation.
- the present invention also relates to the various hATIP proteins and to their applications.
- the present invention further relates to antibodies directed against said proteins as well as to methods of detecting and / or screening for a precancerous or cancerous state using said proteins of said antibodies and / or of the different sequences of 'nucleic acids.
- the angiotensin II AT2 receptor is a receptor with seven transmembrane domains, which thus belongs to the family of receptors coupled to G proteins. Its role during tissue development and regeneration has recently been demonstrated (Nouet et al., Trends Endocrinol. Metabol., 2000, 11, 1-6). Mice whose AT2 gene has been disabled have abnormalities in the development of the urinary tract due to a defect in apoptosis of the mesenchymal cells (Nishimura et al., Molecular Cell, 1999, 3, 1-10).
- this receptor has an effect in many tissues anti-proliferative and pro-apoptotic, through the activation of protein tyrosine phosphatases, including tyrosine phosphatase SHP-1 (Bedecs et al., Biochem. J., 1997, 325, 449-454; Lehtonen et al., Mol. Endocrinol., 1999, 13, 1051-1060). Very recently, an effect of the AT2 receptor on cell differentiation and migration has been demonstrated (Côté et al., J. Biol. Chem., 1999, 274, 44, 31686-31692).
- This protein now called hATIPl, interacts with the C-terminal end of the AT2 receptor, but not with those of other receptors of the same family, such as the ATI, ⁇ 2-adrenergic or bradykinin B2 receptors.
- the hATIPl protein plays a role in the signaling pathways of the AT2 receptor and contributes to attenuating the cell proliferation induced by growth factors.
- hATIP1 family hATIP
- genomic sequences comprising the hATIP gene or at least most of said uncomfortable ; they also iden- tified this gene as a tumor suppressor gene.
- the invention also relates to the use of these sequences for the detection of abnormalities in the expression or of the sequence of the proteins of the hATIP family in certain proliferative lesions and for the treatment of cancer cells including all or part of the hATIP a gene. been altered or deleted.
- the characterization of the hATIP protein family has enabled the inventors to determine the structure and organization into introns / exons of the gene coding for these proteins, located in the chromosomal region 8p21.3-p22.
- the human hATIP gene is organized into at least 17 exons, distributed over more than 112 kilobases of genomic DNA; some of these exons can be used alternately, which leads to transcription of different mRNA molecules. Due to this alternative splicing, these different mRNA molecules have different translation initiating ATG codons and therefore code for proteins of different sequences; the sequences coding for different isoforms of proteins of the hATIP family (hATIP2, hATIP3, hATIP4, hATIP5 and hATIP ⁇ ) were thus identified. While the different proteins of this family diverge in their N-terminal part, they present in their C-terminal part, a common zone which characterizes this family and which includes the zone of interaction with the AT2 receptor.
- the subject of the present invention is therefore an isolated cDNA sequence, characterized in that it is selected from the group consisting of:
- nucleic acid sequences coding for an hATIP protein comprising at least one fragment common to all the hATIP proteins of sequence SEQ ID NO: 11, which corresponds to the region of interaction with the AT2 receptor, which sequence d the nucleic acid does not include the sequence SEQ ID NO: 55; excluding GENBANK sequences no AB033114 and no AL096842;
- homologous sequences from any mammal.
- homologous sequence means a sequence whose identity with the corresponding human sequence (after alignment of sequences) varies from 80 to 99%.
- said cDNA sequence comprises a sequence selected from the group consisting of the sequence SEQ ID NO: 9, a sequence corresponding to positions 364-714 of SEQ ID NO: 9 and a sequence which hybridizes under stringent conditions (under the conditions described in Sambrook et al., 1989) with the sequence SEQ ID NO: 9 and its fragments.
- sequence SEQ ID NO: 9 corresponds to a segment of nucleic sequence common to all the sequences coding for a protein ATIP, which segment includes the sequence coding for the region of interaction with the AT2 receptor.
- the cDNA sequences according to the present invention correspond to the various mRNAs, obtained by alternative splicing and coding respectively for the isoforms hATIP2, hATIP3, hATIP4 and hATIP5.
- sequence coding for the hATIP2 protein has the sequence SEQ ID NO: 1
- sequence coding for the protein hATIP3 has the sequence SEQ ID NO: 3 or the sequence SEQ ID NO: 80 comprising said sequence SEQ ID NO: 3 and in 5 ′ of said sequence, a complementary fragment of 138 nucleotides (SEQ ID NO : 75), as shown in Figure 11.
- sequence coding for the hATIP4 protein has the sequence SEQ ID NO: 5
- sequence coding for the hATIP5 protein has the sequence SEQ ID NO: 7 and
- sequence coding for the hATIP6 protein has the sequence SEQ ID NO. 77 (the open reading phase corresponds to nucleotides 31-3678 of the sequence SEQ ID NO: 77 presented in FIG. 12)
- SEQ ID NO. 77 the open reading phase corresponds to nucleotides 31-3678 of the sequence SEQ ID NO: 77 presented in FIG. 12
- These different cDNA sequences correspond to alternative splices of the hATIP gene; they make it possible to reconstitute the organization of the gene into exons and introns and therefore to define the coding regions.
- the present invention also relates to a genomic nucleic acid segment corresponding to the hATIP gene coding for an hATIP protein, which sequence is characterized in that it is selected from the group consisting of:
- exons are distributed as follows over said genomic sequence (see FIG. 4): - exon 1: it comprises at least 2032 bp which correspond to positions 12651 to 10620 of the sequence AB020865 (segment 8/11); for example it comprises 2121 bp (SEQ ID NO: 82) comprising the sequence SEQ ID NO: 36 and in 5 ′ of said sequence SEQ ID NO: 36, an additional fragment of 89 nucleotides (SEQ ID NO: 79, presented in the Figure 13); this exon codes for the N-terminal part of hATIP3 or of hATIP ⁇ , the initiator ATG codon of which is either in position 31 of the sequence SEQ ID NO: 77 or 80 or 12710 of AB020865, or in position 101 of the sequence 36 or 12550 from AB020865.
- sequence SEQ ID NO: 38 it comprises 61 bp and corresponds to positions 81060 to 81000 of the sequence AB020864 (segment 7/11); it is present in the cDNA of hATIP2 (uterus) and absent in the cDNA of hATIP3 (brain); it can therefore be spliced alternately and characterizes the hATIP2 transcript;
- sequence SEQ ID NO: 39 it comprises 162 bp and corresponds to positions 80731 to 80570 of AB020864 (segment 7/11).
- exon 4 bis (sequence SEQ ID NO: 40): it comprises at least 94 bp and corresponds to positions 78701 to 78608 of AB020864 (segment 7); perhaps the beginning of the exon is missing; this exon is contained only in the sequence encoding hATIP5; it can therefore be spliced alternately and characterizes the hATIP5 transcript;
- sequence SEQ ID NO: 41 it comprises 135 bp and corresponds to positions 72800 to 72666 of AB020864 (segment 7/11); it contains the ATG codon initiating hATIP2 in position 72684 of AB020864 or 117 of SEQ ID NO: 41).
- sequence SEQ ID NO: 42 it comprises 39 bp and corresponds to positions 70152 . to 70114 from AB020864 (segment 7/11); a number of mutations are observed in tumor cells or tissues (see example 8).
- - exon 7 (sequence SEQ ID NO: 43): it comprises 413 bp and corresponds to positions 54567 to 54155 of AB020864 (segment 7/11); this exon is used exclusively by hATIPl (- »alternative splicing). ; it contains the ATG codon initiating hATIPl at position 54275; a number of mutations are observed in tumor cells or tissues (see example 8).
- - exon 8 (sequence SEQ ID NO: 44): it comprises 215 bp and corresponds to positions 41450 to 41236 of AB020864 (segment 7/11); one can observe, in position 41342 of AB020864, an A / C substitution, which gives a Lys / Thr mutation, in particular in certain tumors (see example 8).
- - exon 9 (sequence SEQ ID NO: 45): it comprises 67 bp and corresponds to positions 32194 to 32128 of AB020864 (segment 7/11).
- sequence SEQ ID NO: 46 it comprises 203 bp and corresponds to positions 12951 to 12749 of AB020864 (segment 7/11); a number of mutations are observed in tumor cells or tissues (see example 8).
- sequence SEQ ID NO: 47 it comprises 106 bp and corresponds to positions 11550 to 11445 of AB020864 (segment 7/11).
- sequence SEQ ID NO: 48 it comprises 74 bp and corresponds to positions 10382 to 10309 of AB020864 (segment 7/11); a number of mutations are observed in tumor cells or tissues (see example 8).
- sequence SEQ ID NO: 49 it comprises 96 bp and corresponds to positions 10165 to 10070 of AB020864 (segment 7/11); a G / C substitution is observed, in position 10141 of AB020864, which gives a Glu / Gin mutation in certain tumors (see also example 8).
- sequence SEQ ID NO: 50 it comprises 117 bp and corresponds to positions 6845 to 6729 of AB020864 (segment 7/11); a number of mutations are observed in tumor cells or tissues (see example 8).
- sequence SEQ ID NO: 51 it comprises 98 bp and corresponds to positions 3961 to 3864 of AB020864 (segment 7/11) and
- sequence SEQ ID NO: 52 it comprises 2333 bp and corresponds to positions 3021 to 689 of AB020864 (segment 7/11); it contains the stop codon common to all the hATIP proteins (TGA in position 117 of the sequence SEQ ID NO: 52); a number of mutations are observed in tumor cells or tissues (see example 8).
- the exons used by all the isoforms of hATIP are exons 8 to 16.
- the present invention also relates to fragments said genomic sequences, characterized in that they consist of one of the exons comprising at its 5 'end and / or at its 3 end, an intron segment comprising from 1 to 300 bp; said fragment preferably comprises between 15 and 50 bp, and is included in said intron segment of the genomic sequence which can be located at a distance of 1 to 200 bp upstream and / or downstream of said exons.
- said fragments are selected from the sequences SEQ ID NO: 56-72.
- the present invention also includes fragments of the nucleic acid sequences as defined above and their complementary sequences (including the transcripts). Preferably: - when these fragments comprise between 50 and 1000 bp, they are useful as probes;
- Probe B1260 hybridizes all the sequences coding for an hATIP; extends over exons 11 to 16; it is obtained by RT-PCR with the oligonucleotides B1249 (SEQ ID NO: 21) / B1251 (SEQ ID NO: 22); it makes it possible to detect the hATIP gene and the various forms of the hATIP mRNA by hybridization of the genomic DNA or of the human mRNA under stringent hybridization conditions.
- Probe B1298 (sequence SEQ ID NO: 19): specific for hATIP2, hATIP3, hATIP4, hATIP5 and hATIP ⁇ ; extends over exons 4 to 6 with the exception of exon 4bis; it is obtained by RT-PCR with oligo- nucleotides B1264 (SEQ ID NO: 23) / B1265 (SEQ ID NO: 24); it makes it possible to identify the sequences coding for hATIP2, hATIP 3, hATIP 4, hATIP 5 and hATIP 6, but does not hybridize with the hATIP1 sequence, even under poorly stringent hybridization conditions. .
- fragments useful for amplifying a segment coding for an hATIP a) primers for the amplification of the B1260 probe (common to all hATIPs) (sequence SEQ ID NO: 18):
- - oligonucleotide B1249 23-mer sense (SEQ ID NO: 21), located in exon 11 (SEQ ID NO AT): positions 11501 to 11523 of AB020864 and - oligonucleotide B1251: 24-mer antisense (SEQ ID NO: 22 ), located in exon 16 (SEQ ID NO: 52): positions 2711 to 2734 of AB020864.
- primers for the amplification of the B1298 probe specific for hATIP2, hATIP3, hATIP4, hATIP5 and hATIP ⁇
- - oligonucleotide B1264 21-mer sense (SEQ ID NO: 23), located in exon 4 (SEQ ID NO: 39): positions 80708-80728 of AB020864 and
- - oligonucleotide B1265 19-mer antisense (SEQ ID NO: 24), located in exon 6 (SEQ ID NO: 42): positions 70111-70129 of AB020864.
- - oligonucleotide B1301 19-mer antisense (SEQ ID NO: 26), located in exon 7 (SEQ ID NO: 43): positions 54158-54177 of AB020864.
- fragments useful for detecting a polymorphism or a mutation appearing in cancer cells a) amplification of exon 8 in order to detect the Lys / Thr mutation (AA 56 of the sequence SEQ ID NO: 2): - oligonucleotide B1318: 22-mer sens (SEQ ID NO: 27), located in the intron preceding exon 8 (SEQ ID NO: 64): positions 41584-41605 of AB020864; and
- oligonucleotide B1319 22-antisense (SEQ ID NO: 28), located in the intron following exon 8 (SEQ ID NO: 64): positions 41221-41242 of AB020864.
- - oligonucleotide B1308 22-mer sense (SEQ ID NO: 29), located in the intron preceding exon 13 (SEQ ID NO: 69): positions 10205-10226 of AB020864; and
- oligonucleotide B1309 22-antisense (SEQ ID NO: 30), located in the intron following exon 13 (SEQ ID NO: 69): positions 9894-9915 of AB020864.
- This pair of oligonucleotides produced after amplification of genomic DNA, a 333 bp fragment, in which a G / C substitution at position 10141 of AB020864 (in exon 13) (resulting in a Glu / Gin mutation) generates a site restriction for the enzyme Hinfl.
- - oligonucleotide B1310 19-mer sense (SEQ ID NO: 73), located in the intron which precedes exon 13 (SEQ ID NO: 69): positions 10198- 10216 from AB020864 and
- oligonucleotide B1311 19-mer antisense (SEQ ID NO: 74), located in the intron following exon 13 (SEQ ID NO: 69): positions 9979-9997 of AB 020864.
- amplification of exon 1 in order to detect the C / T substitution (Gin / Stop):
- - oligonucleotide B1314 22-mer sense (SEQ ID NO: 31), located in exon 1: positions 10977-10998 of AB020865; and - oligonucleotide B1315: 22-antisense (SEQ ID NO: 32), located in exon 2: positions 566-587 of AB020865.
- This pair of oligonucleotides produces, after amplification of the mRNA (RT-PCR), a fragment of 516 bp (SEQ ID NO: 33), which should be sequenced, to detect the C / T substitution in position 10664 of AB020865 [creation of a stop codon in position 630 of hATIP3 (SEQ ID NO: 4)] and the substitution A / G in position 10987 of AB020865 [creation of a replacement of a His residue in Arg in position 522 of hATIP3 (SEQ ID NO: 4)].
- fragments useful for detecting alternative splicing a) amplification of exon 3 with a view to detecting alternative splicing, making it possible to distinguish hATIP2 from hATIP3 and hATIP ⁇ :
- - oligonucleotide B1312 22-mer sense (SEQ ID NO: 34), located in exon 2 (SEQ ID NO: 37): positions 562-583 of AB020865; and
- oligonucleotide B1313 22-antisense (SEQ ID NO: 35), located in exon 5 (SEQ ID NO: 41): positions 72687-72708.
- This pair of oligonucleotides produced, after amplification of mRNA (RT-PCR), a 414 bp fragment if exon 3 is present and a 354 bp fragment if exon 3 is absent.
- the experimental conditions for amplification by PCR are similar for all the pairs of oligonucleotides: number of cycles: 30; hybridization temperature between 50 ° C. and 55 ° C., in the presence of Taq polymerase with Proméga DNA, according to the supplier's specifications.
- the sense primer is an oligonucleotide of 25 bp corresponding to the sequence between -100 bp and -200 bp in 5 'of the mutation and the antisense primer is a 25 bp oligonucleotide corresponding to a sequence located between + 100 bp and + 200 bp in 3' of the mutation, on the complementary reverse strand.
- a 200 to 400 bp fragment is obtained which can be sequenced in order to detect the mutation.
- the different nucleic sequences can be obtained by known methods, for example by extension of a nucleic sequence coding for an hATIP protein according to the invention by PCR or reverse PCR or by screening for genomic DNA banks by hybridization with a homologous probe, or by total or partial chemical synthesis.
- nucleic acid sequences make it possible either to determine the expression profile of the hATIP mRNA and a possible alteration of this profile in a tissue or a biological sample, or to highlight the hATIP gene, allelic variants of this gene and a possible alteration of this hATIP gene (changes, deletions, point mutations) and consequently assess the existence of a cancerous state.
- the different nucleic acid sequences defined above constitute good diagnostic tools for the detection of cancer cells which have mutated, deleted or rearranged the tumor suppressor gene. correspondent (ATIP gene) and / or prognosis for the detection of cancer cells by detection of an alteration of the sequences or of the expression of the products of this gene.
- the present invention also relates to a detection reagent, consisting of at least one nucleic acid sequence as defined above.
- the present invention also relates to the use of a nucleic sequence chosen from the group consisting of the nucleic detection reagent as defined above, the nucleic sequence SEQ ID NO: 53 coding for hATIPl and the fragments of minus 15 bp of said sequence SEQ ID NO: 53 for the evaluation, prognosis and / or detection of a precancerous or cancerous state.
- nucleic acid sequences as defined above, can also be advantageously used to construct expression vectors of an hATIP protein, capable of being used to produce said proteins or in gene therapy.
- the present invention therefore also relates to vectors, characterized in that they contain a sequence coding for all or part of a human hATIP protein as defined above.
- the sequence encoding the hATIP protein is under the control of appropriate transcription and translation control elements.
- vectors can be obtained and introduced into a host cell by known techniques.
- the invention also relates to a eukaryotic or prokaryotic host cell transformed with a vector as defined above.
- the present invention also relates to isolated and purified ATIP proteins, characterized in that they are coded by a cDNA sequence or a transcript or a fragment of genomic nucleic acid, as defined above. More specifically, they include at least one fragment common to all hATIP proteins, which corresponds to the region of interaction with the AT2 receptor selected from the group consisting of the sequences SEQ ID NO: 11 and SEQ ID NO: 12, which proteins do not include the sequence SEQ ID NO : 13, specific to hATIPl, in their N-terminal portion.
- Said proteins represent new isoforms interacting with the AT2 receptor.
- the hATIP2 protein has the sequence SEQ ID NO: 2 - the hATIP3 protein has the sequence SEQ ID NO: 4 or the sequence SEQ ID NO: 81 corresponding to SEQ ID NO: 4 added to its N-terminal end of a 53 amino acid sequence (SEQ ID NO: 76), as shown in Figure 11.
- the hATIP4 protein has the sequence SEQ ID NO: 6
- the hATIP5 protein has the sequence SEQ ID NO: 8 and
- the protein hATIP ⁇ has the sequence SEQ ID NO: 78 ( Figure 12).
- PCT / FR99 / 01908 corresponds to the splicing product of exons 7 to 16.
- - hATIP2 corresponds to the splicing product of exons 1 to 16 with the exception of exons 4bis and 7;
- - hATIP3 corresponds to the splicing product of exons 1 to 16 with the exception of exons 3, 4bis and 7;
- - hATIP4 corresponds to a splicing product identical to that of hATIP3; however its N-terminal part is shorter due to the presence of a stop codon in exon 1; this stop codon is due to a C / T substitution at position 10664 of the sequence No. AB020865.
- - hATIP5 corresponds to the splicing product of exons 4 bis to 16, with the exception of exon 7.
- - hATIP ⁇ corresponds to the splicing product of exons 1 to 16 with the exception of exons 3, 4, 4bis and 7.
- said hATIPs comprise particular motifs, located in the sequence SEQ ID NO: 10, common to all the ATIP proteins and containing the sequence SEQ ID NO: 11, corresponding to the region of interaction with the AT2 receptor; said patterns participate in the specific action of said proteins (see FIG. 2):
- the coiled-coil domains favor protein / protein interactions and dimerization.
- the presence of a large coiled-coil domain in the sequences common to all hATIPs indicates that these hATIP proteins are capable of homo-or hetero-dimerization, and that it is this property which could ensure their interaction function. with the AT2 receptor, and possibly their role as tumor suppressors.
- the inventors have found that in certain tumors, mutations are observed at the level of said region of interaction with the AT2 receptor; we can find, for example, the E / Q mutation (position 231 of the sequence SEQ ID NO: 10); this mutation is located in the middle of the first leucine closure motif and in the middle of the coiled-coil region.
- Other motifs are located in specific parts of the various hATIP proteins (see FIG. 1):
- HATIPl protein 2 consensus N-myristylation sites, which correspond respectively to positions 20-25 and 30-35 of the sequence SEQ ID NO: 13; this signal allows a possible post-translational modification of the protein (myristylation) which targets the protein at the membrane. Such signal could allow the interaction of ATIP with membrane proteins.
- HATIP2 protein nuclear localization signal [Nuclear
- NLS Signal Location
- HATIP3 protein 7 consensus N-myristylation sites (see Figure 1).
- HATIP4 protein 2 consensus N-myristylation sites.
- HATIP5 protein 2 consensus N-myristylation sites. These different proteins as well as the hATIPl protein have an action on the proliferation of cancer cells and find application in particular for the preparation of anticancer drugs; for example, re-introduction into cancer cells of the hATIP gene or of appropriate splicing products of the hATIP gene makes it possible to restore normal proliferation of tumor cells. All or part of said proteins can also be directly used in the treatment of tumors.
- the present invention also relates to an anti-tumor medicament, characterized in that it includes a naked nucleic acid sequence, coding for all or part of an hATIP protein, as defined above or a vector such as defined above, or a host one as defined above, or all or part of an hATIP protein as defined above.
- the proteins according to the invention also include any protein (natural, synthetic, semi-synthetic or recombinant) from any mammal; they generally include an interaction domain with the AT2 receptor which has the sequence SEQ ID NO: 12 and include or consist of:
- the term “functional protein” is intended to mean a protein which exhibits normal biological activity (inhibition of cell proliferation and anti-oncogenic or tumor suppressor effect).
- the term “functionally modified mutant of a protein” is intended to mean a mutant which comprises one or more mutations which induce a substantial modification of its activity. Such mutants are in particular those detected in cancer cells.
- the hATIP mutants can have an identity of less than 70% with one of the hATIP isoforms, as defined above; however, the identity of the unmodified sequences of these mutants, when aligned with the sequences of the corresponding hATIP isoforms remains high and may be greater than 70%.
- the present invention also relates to fragments of the proteins as defined above, comprising at least 12 amino acids and in particular the fragments of sequence SEQ ID NO: 10 and 12 to 17.
- sequences SEQ ID NO: 13, 15 and 17 are specific to hATIP 1, hATIP 3 and hATIP 6 and hATIP 5 respectively.
- the present invention further relates to antibodies, characterized in that they are directed against an ATIP protein or a fragment of hATIP protein according to the invention.
- Antibodies directed against a functional or non-functional hATIP isoform or against the zone common to all of the hATIP domain isoforms can thus be obtained. They can advantageously be either polyclonal antibodies or monoclonal antibodies.
- Such antibodies find application as a diagnostic tool for the detection of cancer cells which have mutated or deleted the corresponding tumor suppressor gene (hATIP gene).
- the present invention also relates to a detection reagent, characterized in that it is selected from the group consisting of at at least one protein as defined above, at least one protein fragment as defined above and at least one antibody as defined above.
- the present invention also relates to the use of a protein sequence chosen from the group consisting of at least one protein as defined above, at least one protein fragment as defined above or at least one antibody such as defined above, the sequence SEQ ID NO: 54, the fragments of at least 12 amino acids of said sequence SEQ ID NO: 54 and the antibodies directed against said protein of sequence SEQ ID NO: 54 or its fragments for l 'evaluation, prognosis and / or detection of a precancerous or cancerous state.
- the present invention also relates to means for detecting and correcting precancerous or cancerous states.
- the invention relates to methods which implement the nucleic acid sequences and / or the protein sequences as defined above for the evaluation, diagnosis or prognosis of a precancerous or cancerous state.
- the subject of the invention is methods of diagnosing a cancerous or precancerous state in humans, which comprise: either the detection of the expression of a functionally modified mutant of the hATIP gene, in a nucleic acid sample,
- nucleic acid sequences according to the invention can advantageously be used in these methods.
- the present invention thus also relates to a method for detecting a deletion, an insertion or a substitution in the hATIP gene, to assess the risk of developing a cancerous condition, which includes:
- nucleic acid sample of a nucleic acid sequence coding for an hATIP mutant using at least one nucleic detection reagent, as defined above and / or of the nucleic sequence SEQ ID NO: 53 coding for hATIPl and fragments of at least 15 bp of said sequence SEQ ID NO: 53.
- detecting said mutation by sequencing the sequence obtained or by bringing said sequence into contact with at least one appropriate restriction enzyme and analysis of the fragments obtained with respect to a normal control sample.
- said method comprises for said detection:. the isolation, from the genomic DNA of a patient, and the genomic DNA of a control subject whose hATIP gene contains no mutation, of a portion of the hATIP gene coding for an hATIP protein which includes either of the exons as defined above (SEQ ID NO: 36 to 52), and. hybridization of the genomic sequence of said patient and of said control subject with a labeled probe specific for said portion of sequence of the hATIP gene, then
- the present invention also relates to a method for detecting at least one isoform of hATIP, from a biological sample using polyclonal or monoclonal antibodies, as defined above and / or the directed antibodies. against the protein of sequence SEQ ID NO: 54 or its fragments of at least 12 amino acids.
- the present invention also relates to a method for establishing the expression profile of the hATIP mRNAs of a biological sample, characterized in that it comprises:
- the present invention also relates to a method for establishing the expression profile of the hATIP proteins of a biological sample, characterized in that it comprises:
- the invention also relates to kits or kits for implementing the various methods according to the invention.
- kits preferably comprise at least one pair of primers and at least one optionally labeled probe, such as defined above, and optionally appropriate restriction enzymes.
- They can be implemented, in association with amplification kits; they can also include negative and positive controls, molecular size markers for the electrophoresis gel, for example.
- kits according to the invention can include antibodies, optionally labeled, as well as reagents suitable for the detection of antigen-antibody complexes. ; they can also include positive and negative controls.
- the nucleic acids according to the invention can also be used for therapeutic purposes, for example to restore a tumor suppressor effect.
- FIG. 1 illustrates a comparison of the amino acid sequences: hATIP1, hATIP2, hATIP3, hATIP4 and hATIP5, the consensus sites of N-myristylation are underlined,
- FIG. 2 illustrates the amino acid sequence common to the various hATIPs (SEQ ID NO: 10), in which the two leucine closure motifs are indicated in bold and the coiled-coil domains are underlined,
- FIG. 3 schematically illustrates the alternative use of different exons of the hATIP gene (chromosome 8 ⁇ 21.-p22), allowing the production of 5 different forms of mRNA (hATIPl to 5): the localization of the exons, relative to the Genbank sequences n ° AB020864 and n ° AB020865, is indicated by a double arrow, the exons (3, 4 bis and 7) alternatively used are framed, the start of protein translation is represented by a flag, and the position of the stop codons is represented by a star,
- FIG. 4 illustrates the intron and exon structure of the sequence of the hATIP gene: the location of the different exons is specified with respect to the Genbank sequences n ° AB020864 and n ° AB020865,
- FIG. 5 illustrates the analysis of the hATIP gene by Southern blot, on the human genomic DNA of human tumor cells (MCF-7,
- FIG. 6 illustrates the analysis of the expression profile of the hATIP transcripts in human tumor cell lines of different origins.
- FIG. 7 illustrates the detection, by PCR and restriction analysis, of the G / C substitution at position 10141 of the sequence AB020864 (exon 13), corresponding to the Glu / Gin mutation at amino acid 250 of SEQ ID NO : 2, from human tumor cells: PCR products obtained from wild DNA before and after cleavage by the enzyme Hinfl (lanes 1 and 2), PCR products obtained from DNA mutated in position 10141, before and after cleavage by said enzyme (lanes 3 and 4),
- FIG. 8 illustrates the analysis of the expression profile of proteins of the hATIP family in human tumor cell lines of different origins: ENT sphere (track 1), prostate (tracks 2 and 11), colon (tracks 3, 6, 10 and 13), liver (track 4), lung (tracks 5, 8 and 12), ovary (tracks 7 and 9), by immunoblot using a rabbit polyclonal antibody directed against the sequence (SEQ ID NO: 10), common to the hATIP proteins, - Figure 9 illustrates the inhibitory role of the protein encoded by the cDNA hATIP2 (SEQ ID NO: 1) in the proliferation of CAL33 tumor cells from the ENT sphere, in the presence of 2.5% fetal calf serum.
- FIG. 10 illustrates the property of homo- and hetero-dimerization of the proteins hATIPl and hATIP2, revealed by transient co-transfection of the corresponding labeled cDNAs (Myc and HA), in COS cells, followed by a immunoprecipitation and immunoblot analysis using antibodies specific to the Myc and HA labels.
- FIG. 11 shows the nucleic acid sequence (SEQ ID NO: 80) and protein sequence (SEQ ID NO: 81) complete with hATIP3; the additional nucleic and protein sequences corresponding respectively to the sequences SEQ ID NO: 75 and SEQ ID NO: 76 are underlined.
- FIG. 12 shows the nucleic acid sequence (SEQ ID NO: 77) and protein (SEQ ID NO: 78) of hATIP ⁇ .
- the extraction of total genomic DNA, the preparation and labeling of the probes as well as the hybridization by Southern-Blot are carried out according to the conventional techniques described in Sambrook et al., 1989.
- the samples filions of total genomic DNA, prepared from human tumor cell lines derived from tumors of different origins (breast, ENT sphere and ovary) or normal cells derived from human placenta, are digested with either HindIII or EcoRI.
- the fragments obtained are separated on agarose gel and then transferred to a nylon membrane; the membrane is hybridized with the radiolabelled probe B1260 (SEQ ID NO: 18), in the buffer: 45% formamide, 0.2% BSA, 0.2% polyvinyl pyrrolidone, 0.2% Ficoll, 0.1% sodium pyrophosphate, 0.01% SDS, 0.05 mM Tris pH 7.5 and 0.9 M NaCl, at 45 ° C, washed at low stringency (2X SSC, 0.01% SDS at 45 ° C, then autoradiographed 72 h at - 80 ° C.
- B1260 SEQ ID NO: 18
- EXAMPLE 2 Analysis of the expression profile of the transcripts of the hATIP gene in cell lines derived from human tumors of different origins a) Materials and methods
- RNA prepared from human tumor cell lines derived from tumors of different origins: colon (HT29, SW48), ENT sphere (CAL33), liver (HepG2), lung (SK-MES, 460M, A549, ludlu), prostate (DU1215, LWL- cap) , ovary (Igrovl), and breast (MCF-7), are separated on agarose gel and then transferred to a nylon membrane; the membrane is hybridized with the B1260 probe comprising exons 11 to 16 (SEQ ID NO: 18) (top panel), or with the B1299 probe comprising exons 4, 5, 6 (SEQ ID NO: 19) (bottom panel).
- Each of the probes is radiolabelled, then hybridized with the membrane in the buffer: 45% formamide, 9% Dextran-sulfate, 0.2% BSA, 0.2% polyvinyl pyrrolidone, 0.2% Ficoll, 0.1% sodium pyrophosphate , 0.01% SDS, 0.05 mM Tris pH 7.5 and 0.9 M NaCl, at 45 ° C, washed at low stringency (2X SSC, 0.01% SDS at 45 ° C), then autoradiographed 72 h at -80 ° C.
- Figure 6 shows, in human tumor cells originating from tumors of different origins: colon (HT29, SW48), ENT sphere (CAL33), liver (HepG2), lung (SK-MES, 460M, A549, ludlu), prostate ( DU1215, LWL-cap), ovary (Igrovl), and breast (MCF-7), different expression levels of transcripts of 7 kb, 5 kb, 3.5 kb and 2 kb, revealed by the B1260 probe common to all hATIP sequences.
- the transcripts hATIP2, hATIP3, hATIP4, hATIP ⁇ , specifically revealed by the B1299 probe, are contained in the 7 kb hybridization product.
- transcripts are completely absent in the LWL-cap prostate tumor line. Due to the length of the corresponding cDNA, the hATIPl transcript must be contained in the 2 kb hybridization product, which is also absent in the LWL-cap line. The other hybridization products, with sizes of 5 kb, and 3.5 kb, contain transcripts which have not yet been identified.
- the genomic DNA is extracted from the tumor cells as described in Example 1, the PCR amplification is carried out using DNA Taq polymerase (Proméga), according to the protocol recommended by the producer, under the conditions following experimental: number of cycles: 30; hybridization temperature: 55 ° C.
- the detection of the G / C substitution in position 10141 of the sequence AB020864 (exon 13) is carried out according to the following protocol: - comparative amplification of a 238 bp fragment of exon 13 using the primers SEQ ID NO: 73 and SEQ ID NO: 74, in a sample of tumor cells to be analyzed, and in a sample of normal cells ( control). - Hinfl digestion
- FIG. 7 shows the detection of the G / C substitution at position 10141 of the sequence AB020864 (exon 13), corresponding to the Glu / Gin mutation at amino acid 250 of SEQ ID NO: 2, from human tumor cells .
- the presence of two cleavage products (203 and 35 bp) is characteristic of a wild-type DNA sequence.
- the detection of three DNA fragments (132, 71 and 35 bp) is characteristic of a mutated DNA sequence.
- EXAMPLE 4 Production of antibodies. 1. Production of antibodies to all hATIP proteins
- An anti-hATIP polyclonal serum is produced in rabbits by injection of a fusion protein comprising the sequence SEQ ID NO: 11 fused to 6 histidine residues.
- These polyclonal antibodies used in immunoblotting identify three major polypeptides of apparent molecular weight: 32kDa, 64 kDa and 180 kDa, in cell lysates from different human tumor lines (see Example 5).
- These antibodies also detect the presence of a polypeptide of apparent molecular weight of 57 kDa, in the lysate of certain cells. tumor.
- the detection of ATIP proteins of outliers in tissue lysates is a diagnostic method for the screening of certain cancers.
- antibodies specific for the polypeptides hATIP2, hATIP3, hATIP4 and hATIP5 can be obtained by injection into rabbits of a peptide of at least 12 amino acids, comprising all or part of the sequence SEQ ID NO: 14; . antibodies specific for the hATIPl polypeptide can be obtained by injection into rabbits of a peptide of at least 12 amino acids, comprising all or part of the sequence SEQ ID NO: 13;
- antibodies specific for the hATIP3 or hATIP ⁇ polypeptide can be obtained by injection into rabbits of a peptide of at least 12 amino acids, comprising all or part of the sequence SEQ ID NO: 15.
- antibodies specific for the hATIP5 polypeptide can be obtained by injection into rabbits of a peptide of at least 12 amino acids, comprising all or part of the sequence SEQ ID NO: 17.
- EXAMPLE 5 Detection of an alteration in the expression of hATIP proteins in cancer cells by the immunoblot method, using specific antibodies.
- the protein samples obtained after cell lysis are assayed, separated by electrophoresis in 10% polyacrylamide gel, in the presence of SDS, then the proteins are transferred onto a nitrocellulose membrane and revealed using an antibody.
- polyclonal anti-hATIP according to the example
- FIG. 8 Analysis of the expression profile of hATIP proteins in human tumor lines of different origins, analyzed by immuno- blot using a polyclonal anti-hATIP antibody (FIG. 8), shows: the presence of three major polypeptides of apparent molecular weight: 32 kDa, 64 kDa and 180 kDa, corresponding to the hATIP proteins. In addition, the presence of an apparent molecular weight polypeptide of 57 kDa, corresponding to an aberrant size hATIP protein, is also observed in certain tumor lines. The detection of aberrant-sized hATIP proteins in tissue lysates is a diagnostic method for the detection of certain cancers.
- the CAL33 tumor cells are transfected with the hATIP2 cDNA (SEQ ID NO: 1) inserted into the expression vector ⁇ cDNA3 which comprises a gene for resistance to neomycin.
- the transfected (CAL33-2C) or non-transfected (CAL33-WT) cells are seeded at the density of 0.2 million cells per well of 6-well plates, in Dulbecco's Modified Eagle Medium (DMEM) culture medium comprising 1 g / 1 glucose and 10% fetal calf serum (SVF). The cells are then weaned overnight, then grown in DMEM lg / l glucose medium, in the presence of 2.5% FCS. After 24 or 48 hours of culture, the cells are detached and counted with the hematimeter.
- DMEM Dulbecco's Modified Eagle Medium
- EXAMPLE 7 Homo- and hetero-dimerization of the proteins hATIPl and hATIP2
- the proteins of the ATIP family are characterized by the presence in their carboxy-teral portion of several coiled-coil regions, known to promote protein-protein interactions. These coiled-coil motifs are precisely contained in the field of interaction of the ATIP proteins with the AT2 receptor for angiotensin II.
- the role of the ATIP proteins, by forming homo- and heterodimers through these coiled-coil domains, would be to allow the dimerization of the AT2 receptors and thereby regulate their function. Indeed, it is increasingly well established that the dimerization of receptors with seven transmembrane domains plays a fundamental role in their activation.
- COS cells are co-transfected with pcDNA3 plasmids containing the hATIPl or hATIP2 cDNA fused in phase with the HA epitope (hemagglutinin) or with the Myc epitope, placed at the N-terminal. After 48 hours of expression in culture, the COS cells are lysed and immunoprecipitated using anti-Myc monoclonal antibodies. The immunoprecipitated complexes are subjected to electrophoresis (SDS-PAGE), transferred onto a nitrocellulose membrane, and analyzed by immunoblotting using anti-HA or anti-ATIP polyclonal rabbit antibodies. After incubation with a second antibody (anti-rabbit) coupled to peroxidase, the immunocomplexes are revealed by chemiluminescence.
- SDS-PAGE electrophoresis
- the Myc-hATIPl and Myc-hATIP2 polypeptides expressed in COS cells are correctly immunoprecipitated by the anti-Myc monoclonal antibodies (FIG. 10, lanes 2, 3 and 7) and migrate on SDS gel at the expected size: 50 kDa for hATIPl and 55 kDa for hATIP2.
- Homodimerization of hATIPl is revealed in cells co-transfected with Myc-hATIPl and HA-hATIPl, by immunoprecipitation with the anti-Myc antibody and immunoblotting with the anti-HA antibodies (lane 6).
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PCT/FR2001/000359 WO2001057209A2 (fr) | 2000-02-07 | 2001-02-07 | Nouvelle famille de proteines, denommees atip, les sequences nucleiques codant pour lesdites proteines et leurs applications |
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US20130345145A1 (en) | 2011-03-10 | 2013-12-26 | Institut National De La Sante Et De La Recherche Medicale (Inserm) | Atip3 and biologically active fragments thereof for use in the treatment of cancer |
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