Interactions of the HSM3 gene with genes initiating homologous recombination repair in yeast Saccharomyces cerevisiae

Interactions of the HSM3 gene with genes initiating homologous recombination repair in yeast... It was assumed previously that the mutator phenotype of the hms3 mutant was determined by processes taking place in the D-loop. As a next step, genetic analysis was performed to study the interactions between the hsm3 mutation and mutations of the genes that control the initial steps of the D-loop formation. The mutations of the MMS4 and XRS2 genes, which initiate the double-strand break formation and subsequent repair, were shown to completely block HSM3-dependent UV-induced mutagenesis. Mutations of the RAD51, RAD52, and RAD54 genes, which are also involved in the D-loop formation, only slightly decreased the level of UV-induced mutagenesis in the hsm3 mutant. Similar results were observed for the interaction of hsm3 with the mph1 mutation, which stabilizes the D-loop. In contrast, the shu1 mutation, which destabilizes the D-loop structure, led to an extremely high level of UV-induced mutagenesis and displayed epistatic interactions with the hsm3 mutation. The results made it possible to assume that the hsm3 mutation destabilizes the D-loop, which is a key substrate of both Rad5- and Rad52-dependent postreplicative repair pathways. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Genetics Springer Journals

Interactions of the HSM3 gene with genes initiating homologous recombination repair in yeast Saccharomyces cerevisiae

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Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2012 by Pleiades Publishing, Ltd.
Subject
Biomedicine; Animal Genetics and Genomics; Microbial Genetics and Genomics; Human Genetics
ISSN
1022-7954
eISSN
1608-3369
D.O.I.
10.1134/S1022795412020056
Publisher site
See Article on Publisher Site

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