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. 1999 Apr;151(4):1245–1259. doi: 10.1093/genetics/151.4.1245

CYS3, a hotspot of meiotic recombination in Saccharomyces cerevisiae. Effects of heterozygosity and mismatch repair functions on gene conversion and recombination intermediates.

M Vedel 1, A Nicolas 1
PMCID: PMC1460566  PMID: 10101154

Abstract

We have examined meiotic recombination at the CYS3 locus. Genetic analysis indicates that CYS3 is a hotspot of meiotic gene conversion, with a putative 5'-3' polarity gradient of conversion frequencies. This gradient is relieved in the presence of msh2 and pms1 mutations, indicating an involvement of mismatch repair functions in meiotic recombination. To investigate the role of mismatch repair proteins in meiotic recombination, we performed a physical analysis of meiotic DNA in wild-type and msh2 pms1 strains in the presence or absence of allelic differences at CYS3. Neither the mutations in CYS3 nor the absence of mismatch repair functions affects the frequency and distribution of nearby recombination-initiating DNA double-strand breaks (DSBs). Processing of DSBs is also similar in msh2 pms1 and wild-type strains. We conclude that mismatch repair functions do not control the distribution of meiotic gene conversion events at the initiating steps. In the MSH2 PMS1 background, strains heteroallelic for frameshift mutations in CYS3 exhibit a frequency of gene conversion greater than that observed for either marker alone. Physical analysis revealed no modification in the formation of DSBs, suggesting that this marker effect results from subsequent processing events that are not yet understood.

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Selected References

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