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. 1996 Mar;16(3):1085–1093. doi: 10.1128/mcb.16.3.1085

Mitotic crossovers between diverged sequences are regulated by mismatch repair proteins in Saccaromyces cerevisiae.

A Datta 1, A Adjiri 1, L New 1, G F Crouse 1, S Jinks Robertson 1
PMCID: PMC231091  PMID: 8622653

Abstract

Mismatch repair systems correct replication- and recombination-associated mispaired bases and influence the stability of simple repeats. These systems thus serve multiple roles in maintaining genetic stability in eukaryotes, and human mismatch repair defects have been associated with hereditary predisposition to cancer. In prokaryotes, mismatch repair systems also have been shown to limit recombination between diverged (homologous) sequences. We have developed a unique intron-based assay system to examine the effects of yeast mismatch repair genes (PMS1, MSH2, and MSH3) on crossovers between homologous sequences. We find that the apparent antirecombination effects of mismatch repair proteins in mitosis are related to the degree of substrate divergence. Defects in mismatch repair can elevate homologous recombination between 91% homologous substrates as much as 100-fold while having only modest effects on recombination between 77% homologous substrates. These observations have implications for genome stability and general mechanisms of recombination in eukaryotes.

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Selected References

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