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Nature. 1997 Jun 26;387(6636):929-31.

Repair of DNA loops involves DNA-mismatch and nucleotide-excision repair proteins.

Author information

1
Department of Biology, Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, 27599-3280, USA.

Abstract

A number of enzymes recognize and repair DNA lesions. The DNA-mismatch repair system corrects base-base mismatches and small loops, whereas the nucleotide-excision repair system removes pyrimidine dimers and other helix-distorting lesions. DNA molecules with mismatches or loops can arise as a consequence of heteroduplex formation during meiotic recombination. In the yeast Saccharomyces cerevisiae, repair of mismatches results in gene conversion or restoration, and failure to repair the mismatch results in post-meiotic segregation (PMS). The ratio of gene-conversion to PMS events reflects the efficiency of DNA repair. By examining the PMS patterns in yeast strains heterozygous for a mutant allele with a 26-base-pair insertion, we find that the repair of 26-base loops involves Msh2 (a DNA-mismatch repair protein) and Rad1 (a protein required for nucleotide-excision repair).

PMID:
9202128
DOI:
10.1038/43225
[Indexed for MEDLINE]

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