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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Involvement of SGS1 in DNA damage- induced heteroallelic recombination that requires RAD52 in Saccharomyces cerevisiae.

The SGS1 gene of Saccharomyces cerevisiae is homologous to the genes that are mutated in Bloom's syndrome and Werner's syndrome in humans. Disruption of SGS1 results in high sensitivity to methyl methanesulfonate (MMS), poor sporulation, and a hyper-recombination phenotype including recombination between heteroalleles. In this study, we found that SGS1 forms part of the RAD52 epistasis group when cells are exposed to MMS. Exposure to DNA-damaging agents causes a striking, Rad52-dependent, increase in heteroallelic recombination in wild-type cells, but not in sgs1 disruptants. However, in the absence of DNA damage, the frequency of heteroallelic recombination in sgs1 disruptants was several-fold higher than in wild-type cells, as described previously. These results imply a function for Sgs1: it acts to suppress spontaneous heteroallelic recombination, and to promote DNA damage-induced heteroallelic recombination.[1]


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