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Minicircle: an improved DNA molecule for in vitro and in vivo gene transfer

Gene Therapy volume 6, pages 209–218 (1999)Cite this article

Abstract

Minicircles are a new form of supercoiled DNA molecule for nonviral gene transfer which have neither bacterial origin of replication nor antibiotic resistance marker. They are thus smaller and potentially safer than the standard plasmids currently used in gene therapy. They were obtained in E. coli by att site-specific recombination mediated by the phage λ integrase, which was used to excise the expression cassette from the unwanted plasmid sequences. We produced two minicircles containing the luciferase or β-galactosidase gene under the control of the strong human cytomegalovirus immediate–early enhancer/promoter. Comparing maximal differences, these minicircles gave 2.5 to 5.5 times more reporter gene activity than the unrecombined plasmid in the NIH3T3 cell line and rabbit smooth muscle cells. Moreover, injection in vivo into mouse cranial tibial muscle, or human head and neck carcinoma grafted in nude mice resulted in 13 to 50 times more reporter gene expression with minicircles than with the unrecombined plasmid or larger plasmids. Histological analysis in muscle showed there were more transfected myofibers with minicircles than with unrecombined plasmid.

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Authors and Affiliations

  1. UMR 133 CNRS/Rhône-Poulenc Rorer, Centre de Recherche de Vitry-Alfortville, Vitry sur Seine, France

    A-M Darquet, R Rangara, P Kreiss, B Schwartz & D Scherman

  2. Rhône-Poulenc Rorer Gencell, Centre de Recherche de Vitry-Alfortville, Vitry sur Seine, France

    S Naimi, P Delaère & J Crouzet

Authors
  1. A-M Darquet
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  2. R Rangara
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  4. B Schwartz
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  5. S Naimi
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  6. P Delaère
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  7. J Crouzet
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  8. D Scherman
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Darquet, AM., Rangara, R., Kreiss, P. et al. Minicircle: an improved DNA molecule for in vitro and in vivo gene transfer. Gene Ther 6, 209–218 (1999). https://doi.org/10.1038/sj.gt.3300816

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  • DOI: https://doi.org/10.1038/sj.gt.3300816

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