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• W2507609097 abstract "Abstract Mutations that cause genome instability are considered important predisposing events that contribute to initiation and progression of cancer. Genome instability arises either due to defects in genes that cause an increased mutation rate (mutator phenotype), or defects in genes that cause chromosome instability (CIN). To extend the catalog of genome instability genes, we systematically explored the effects of gene overexpression on mutation rate, using a forward-mutation screen in budding yeast. We screened ∼5100 plasmids, each overexpressing a unique single gene, and characterized the five strongest mutators, MPH1 (mutator phenotype 1), RRM3, UBP12, PIF1, and DNA2. We show that, for MPH1, the yeast homolog of Fanconi Anemia complementation group M (FANCM), the overexpression mutator phenotype is distinct from that of mph1Δ. Moreover, while four of our top hits encode DNA helicases, the overexpression of 48 other DNA helicases did not cause a mutator phenotype, suggesting this is not a general property of helicases. For Mph1 overexpression, helicase activity was not required for the mutator phenotype; in contrast Mph1 DEAH-box function was required for hypermutation. Mutagenesis by MPH1 overexpression was independent of translesion synthesis (TLS), but was suppressed by overexpression of RAD27, a conserved flap endonuclease. We propose that binding of DNA flap structures by excess Mph1 may block Rad27 action, creating a mutator phenotype that phenocopies rad27Δ. We believe this represents a novel mutator mode-of-action and opens up new prospects to understand how upregulation of DNA repair proteins may contribute to mutagenesis." @default.
• W2507609097 created "2016-09-16" @default.
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• W2507609097 date "2016-11-01" @default.
• W2507609097 modified "2023-09-27" @default.
• W2507609097 title "Dosage Mutator Genes in <i>Saccharomyces cerevisiae</i>: A Novel Mutator Mode-of-Action of the Mph1 DNA Helicase" @default.
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• W2507609097 doi "https://doi.org/10.1534/genetics.116.192211" @default.
• W2507609097 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5105872" @default.
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