The essential helicase gene RAD3 suppresses short-sequence recombination in Saccharomyces cerevisiae

Author:

Bailis A M1,Maines S1,Negritto M T1

Affiliation:

1. Department of Molecular Genetics, Beckman Research Institute, City of Hope National Medical Center, Duarte, California 91010, USA.

Abstract

We have isolated an allele of the essential DNA repair and transcription gene RAD3 that relaxes the restriction against recombination between short DNA sequences in Saccharomyces cerevisiae. Double-strand break repair and gene replacement events requiring recombination between short identical or mismatched sequences were stimulated in the rad3-G595R mutant cells. We also observed an increase in the physical stability of double-strand breaks in the rad3-G595R mutant cells. These results suggest that the RAD3 gene suppresses recombination involving short homologous sequences by promoting the degradation of the ends of broken DNA molecules.

Publisher

American Society for Microbiology

Subject

Cell Biology,Molecular Biology

Reference73 articles.

1. Yeast intrachromosomal recombination: long gene conversion tracts are preferentially associated with reciprocal exchange and require the RAD1 and RAD3 gene products;Aguilera A.;Genetics,1989

2. Mitotic gene conversion lengths, coconversion patterns, and the incidence of reciprocal recombination in a Saccharomyces cerevisiae plasmid system;Ahn B.;Mol. Cell. Biol.,1986

3. Analysis of wild-type and rad50 mutants of yeast suggests an intimate relationship between meiotic chromosome synapsis and recombination;Alani E.;Cell,1990

4. Bailis A. M. Unpublished observations.

5. Genome rearrangement in top3 mutants of Saccharomyces cerevisiae requires a functional RAD1 excision repair gene;Bailis A. M.;Mol. Cell. Biol.,1992

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