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doi:10.1534/genetics.104.036764
A more recent version of this article appeared on March 1, 2005.
REGULAR RESEARCH PAPERS |
A genetic screen for top3 suppressors in Saccharomyces cerevisiae identifies SHU1, SHU2, PSY3, and CSM2 - four genes involved in error-free DNA repair
Erika Shor 1, Justin Weinstein 1 and Rodney Rothstein 2*
1 Columbia University
2 Columbia University Coll. of Phys. & Surg.
* To whom correspondence should be addressed. E-mail: rothstein{at}cancercenter.columbia.edu.
Submitted on September 23, 2004
Revised on November 2, 2004
Accepted on 29 November 2004
Helicases of the RecQ family and topoisomerase III are evolutionarily conserved proteins important for maintenance of genome stability. In Saccharomyces cerevisiae, loss of the TOP3 gene, encoding topoisomerase III, results in a phenotype of slow growth, DNA damage sensitivity, meiotic defects, and hyper-recombination. The sole RecQ helicase in budding yeast, Sgs1, interacts with Top3 both physically and genetically, and the two proteins are thought to act in concert in vivo. Much recent genetic and biochemical evidence points to the role of RecQ helicases and topoisomerase III in regulating homologous recombination (HR) during DNA replication. Previously, we found that mutations in HR genes partially suppress top3 slow growth. Here, we describe the analysis of four additional mutational suppressors of top3 defects: shu1, shu2, psy3, and csm2. These genes belong to one epistasis group and their protein products interact with each other, strongly suggesting that they function as a complex in vivo. Their mutant phenotype indicates that they are important for error-free repair of spontaneous and induced DNA lesions, protecting the genome from mutation. These mutants exhibit an epistatic relationship with rad52 and show altered dynamics of Rad52-YFP foci, suggesting a role for these proteins in recombinational repair.
Key Words: DNA repair, Homologous recombination, Sgs1-Top3, Shu1-Shu2-Psy3-Csm2
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