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. 1985 Apr;5(4):684–691. doi: 10.1128/mcb.5.4.684

Effect of insertions, deletions, and double-strand breaks on homologous recombination in mouse L cells.

D A Brenner, A C Smigocki, R D Camerini-Otero
PMCID: PMC366770  PMID: 3990689

Abstract

We have used DNA-mediated gene transfer to study homologous recombination in cultured mammalian cells. A family of plasmids with insertion and deletion mutations in the coding region of the herpes simplex type 1 thymidine kinase (tk) gene served as substrates for DNA-mediated gene transfer into mouse Ltk- cells by the calcium phosphate technique. Intermolecular recombination events were scored by the number of colonies in hypoxanthine-aminopterin-thymidine selective medium. We used supercoiled plasmids containing tk gene fragments to demonstrate that an overlap of 62 base pairs (bp) of homologous DNA was sufficient for intermolecular recombination. Addition of 598 bp of flanking homology separated from the region of recombination by a double-strand gap, deletion, or insertion of heterologous DNA increased the frequency of recombination by 300-, 20-, or 40-fold, respectively. Linearizing one of the mutant plasmids in a pair before cotransfer by cutting in the area of homology flanking a deletion of 104 bp or an insertion of less than 24 bp increased the frequency of recombination relative to that with uncut plasmids. However, cutting an insertion mutant of greater than or equal to 24 bp in the same manner did not increase the frequency. We show how our data are consistent with models that postulate at least two phases in the recombination process: homologous pairing and heteroduplex formation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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