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• W2238732923 abstract "Abstract Much of our knowledge about the fitness effects of new mutations has been gained from mutation accumulation (MA) experiments. Yet the fitness effect of single mutations is rarely measured in MA experiments. This raises several issues, notably for inferring epistasis for fitness. The acceleration of fitness decline in MA lines has been taken as evidence for synergistic epistasis, but establishing the role of epistasis requires measuring the fitness of genotypes carrying known numbers of mutations. Otherwise, accelerating fitness loss could be explained by increased genetic mutation rates. Here we segregated mutations accumulated over 4800 generations in haploid and diploid MA lines of the yeast Saccharomyces cerevisiae. We found no correspondence between an accelerated fitness decline and synergistic epistasis among deleterious mutations in haploid lines. Pairs of mutations showed no overall epistasis. Furthermore, several lines of evidence indicate that genetic mutation rates did not increase in the MA lines. Crucially, segregant fitness analyses revealed that MA accelerated in both haploid and diploid lines, even though the fitness of diploid lines was nearly constant during the MA experiment. This suggests that the accelerated fitness decline in haploids was caused by cryptic environmental factors that increased mutation rates in all lines during the last third of the lines’ transfers. In addition, we provide new estimates of deleterious mutation rates, including lethal mutations, and highlight that nearly all the mutational load we observed was due to one or two mutations having a large effect on fitness." @default.
• W2238732923 created "2016-06-24" @default.
• W2238732923 creator A5085672702 @default.
• W2238732923 creator A5090597495 @default.
• W2238732923 date "2015-11-23" @default.
• W2238732923 modified "2023-10-13" @default.
• W2238732923 title "Accelerating Mutational Load Is Not Due to Synergistic Epistasis or Mutator Alleles in Mutation Accumulation Lines of Yeast" @default.
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• W2238732923 doi "https://doi.org/10.1534/genetics.115.182774" @default.
• W2238732923 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4788247" @default.
• W2238732923 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26596348" @default.
• W2238732923 hasPublicationYear "2015" @default.
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