Repair of specific base pair mismatches formed during meiotic recombination in the yeast Saccharomyces cerevisiae. | Zendy

Peter J. Detloff | Zendy; Jennifer Sieber | Zendy; Thomas D. Petes | Zendy

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Repair of specific base pair mismatches formed during meiotic recombination in the yeast Saccharomyces cerevisiae.

Author(s) -

Peter J. Detloff,

Jennifer Sieber,

Thomas D. Petes

Publication year - 1991

Publication title -

molecular and cellular biology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.14

H-Index - 327

eISSN - 1067-8824

pISSN - 0270-7306

DOI - 10.1128/mcb.11.2.737

Subject(s) - heteroduplex , saccharomyces cerevisiae , biology , homologous recombination , genetics , yeast , mutant , dna , gene conversion , base pair , gene , point mutation , dna repair , meiosis , saccharomyces , recombination

Heteroduplexes formed between DNA strands derived from different homologous chromosomes are an intermediate in meiotic crossing over in the yeast Saccharomyces cerevisiae and other eucaryotes. A heteroduplex formed between wild-type and mutant genes will contain a base pair mismatch; failure to repair this mismatch will lead to postmeiotic segregation (PMS). By analyzing the frequency of PMS for various mutant alleles in the yeast HIS4 gene, we showed that C/C mismatches were inefficiently repaired relative to all other point mismatches. These other mismatches (G/G, G/A, T/T, A/A, T/C, C/A, A/A, and T/G) were repaired with approximately the same efficiency. We found that in spores with unrepaired mismatches in heteroduplexes, the nontranscribed strand of the HIS4 gene was more frequently donated than the transcribed strand. In addition, the direction of repair for certain mismatches was nonrandom.

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