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. 1984 Nov;4(11):2253–2258. doi: 10.1128/mcb.4.11.2253

The minimum amount of homology required for homologous recombination in mammalian cells.

J Rubnitz, S Subramani
PMCID: PMC369052  PMID: 6096689

Abstract

Although DNA sequence homology is believed to be a prerequisite for homologous recombination events in procaryotes and eucaryotes, no systematic study has been done on the minimum amount of homology required for homologous recombination in mammalian cells. We have used simian virus 40-pBR322 hybrid plasmids constructed in vitro as substrates to quantitate intramolecular homologous recombination in cultured monkey cells. Excision of wild-type simian virus 40 DNA by homologous recombination was scored by the viral plaque assay. Using a series of plasmids containing 0 to 243 base pairs of homology, we have shown that the recombination frequency decreases as the homology is reduced, with the sharpest drop in recombination frequency occurring when the homology was reduced from 214 to 163 base pairs. However, low recombination frequencies were also observed with as little as 14 base pairs of homology.

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Selected References

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