Hyper-recombination and mutator effects of the mms9-1, mms13-1, and mms21-1 mutations in Saccharomyces cerevisiae |
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Authors: | Beth A. Montelone Satya Prakash Louise Prakash |
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Affiliation: | (1) Department of Biology, University of Rochester, 14627 Rochester, NY, USA;(2) Department of Radiation Biology and Biophysics, University of Rochester, School of Medicine, 14642 Rochester, NY, USA |
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Abstract: | Summary Spontaneous mitotic intragenic and intergenic recombination at various sites is enhanced 10 to 100 fold in the methyl methanesulfonate (MMS)-sensitive mutants mms9-1, mms13-1, and mms21-1 of Saccharomyces cerevisiae. All three mutants show elevated rates of spontaneous mutation. Sporulation is reduced in diploids homozygous for any of the three mutations, and a deficiency in meiotic recombination and meiotic chromosome segregation is observed. Pleiotropic effects on cell viability, growth rate, and radiation sensitivity, in combination with the alterations in recombination and mutagenesis displayed by mutant strains, suggest that the MMS9, MMS13, and MMS21 genes play important roles in DNA replication and/or genetic recombination. |
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Keywords: | Hyper-recombination mutants Mutators Mitotic recombination Meiotic recombination |
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