Palindromic sequences in heteroduplex DNA inhibit mismatch repair in yeast

Dilip K. Nag, Michael A. White, Thomas D. Petes

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127 Scopus citations


ALTHOUGH single heterozygous markers in yeast usually segregate during meiosis in a 2:2 ratio, abberant 3:1 segregations occur quite frequently as a result of gene-conversion events1. A second type of aberrant segregation, post-meiotic segregation, results from the segregation of two genotypes from a single haploid spore; in yeast such events are detected as sectored spore colonies and usually occur rarely1. Post-meiotic segregation is thought to result from the replication of heteroduplex DNA formed during meiotic recombination. We report here that if the heteroduplex includes a palindromic insertion sequence, a high frequency of post-meiotic segregation results. This suggests that palindromic insertions are poorly repaired, which may be the result of hairpin-loop formation that affects the efficiency of repair of heteroduplex DNA.

Original languageEnglish (US)
Pages (from-to)318-320
Number of pages3
Issue number6231
StatePublished - Jan 1 1989

ASJC Scopus subject areas

  • General


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