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. 1998 Apr;148(4):1525–1533. doi: 10.1093/genetics/148.4.1525

The chromosome bias of misincorporations during double-strand break repair is not altered in mismatch repair-defective strains of Saccharomyces cerevisiae.

C B McGill 1, S L Holbeck 1, J N Strathern 1
PMCID: PMC1460100  PMID: 9560371

Abstract

Recombinational repair of a site-specific, double-strand DNA break (DSB) results in increased reversion frequency for nearby mutations. Although some models for DSB repair predict that newly synthesized DNA will be inherited equally by both the originally broken chromosome and the chromosome that served as a template, the DNA synthesis errors are almost exclusively found on the chromosome that had the original DSB (introduced by the HO endonuclease). To determine whether mismatch repair acts on the template chromosome in a directed fashion to restore mismatches to the initial sequence, these experiments were repeated in mismatch repair-defective (pms1, mlh1, and msh2) backgrounds. The results suggest that mismatch repair is not responsible for the observed bias.

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Selected References

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