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Reference: Simon JR and Moore PD (1990) Transformation and recombination in rad mutants of Saccharomyces cerevisiae. Mol Gen Genet 223(2):241-8

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Abstract

Disruption/deletion mutations in genes of the RAD52 epistasis group of Saccharomyces cerevisiae were examined for their effects on recombination between single- and double-stranded circular DNA substrates and chromosomal genes in a transformation assay. In rad50 mutants there was a small reduction in recombination with single-stranded DNA at the leu2-3, 112 allele; in addition there was an almost complete elimination of recombination at trp1-1 for both single- and double-stranded DNA. Reintroduction of a wild-type RAD50 gene on a replicating plasmid carrying CEN4 restored recombinational competence at trp1-1, indicating that rad50 is defective in gene replacement of this allele. In rad52 mutants a reduction of 30%-50% in recombination involving either single- or double-stranded circular DNA was observed in each experiment when compared to the wild type. This reduction of recombination in rad52 mutants was similar for recombination at the ura3-52 mutant locus where only integration events have been observed, and at the trp1-1 mutant locus, where recombination occurs predominantly by gene replacement. Neither the rad54 nor the rad57 mutations had a significant effect on recombination with single- or double-stranded DNA substrates.

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Journal Article
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Simon JR, Moore PD
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