Summary
Bovine papillomavirus (BPV) shuttle vectors replicate as a circular plasmid in mouse cell nuclei without impairing host cell viability. We used these vectors to analyze homologous recombination in mammalian cells. When several BPV-based plasmids carrying direct repeats were introduced into C127 cells, we detected many recombinant plasmid molecules that have lost the sequence between the repeats. Many recombinant type molecules as well as parental type molecules were detected in all the cell clones isolated for analysis. Sequencing after rescue of the plasmid inEscherichia coli showed that most of the recombinants were from accurate homologous recombination. When the repeats on the plasmid were in inverted orientation, no crossing-over type products were detected. We discuss possible mechanisms that explain these features.
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Communicated by M. Sekiguchi
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Kitamura, Y., Yoshikura, H. & Kobayashi, I. Homologous recombination in a mammalian plasmid. Mol Gen Genet 222, 185–191 (1990). https://doi.org/10.1007/BF00633816
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DOI: https://doi.org/10.1007/BF00633816