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Genetics, Vol 140, 443-456, Copyright © 1995
INVESTIGATIONS |
Specificities of the Saccharomyces cerevisiae rad6, rad18, and rad52 Mutators Exhibit Different Degrees of Dependence on the REV3 Gene Product, a Putative Nonessential DNA Polymerase
H. Roche, R. D. Gietz and B. A. Kunz
Department of Microbiology, The University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2.
The Saccharomyces cerevisiae rad6, rad18, and rad52 mutants exhibit DNA repair deficiencies and distinct mutator phenotypes. DNA replication past unrepaired spontaneous damage might contribute to the specificities of these mutators. Because REV3 is thought to encode a DNA polymerase that specializes in translesion synthesis, we determined the REV3 dependence of the rad mutator specificities. Spontaneous mutagenesis at a plasmid-borne SUP4-o locus was examined in isogenic strains having combinations of normal or mutant REV3 and RAD6, RAD18, or RAD52 alleles. For the rad6 and rad18 mutators, the mutation rate increase relied largely, but not exclusively, on REV3 whereas the rad52 mutator was entirely REV3 dependent. The influence of REV3 on the specificity of the rad6 mutator differed markedly depending on the mutational class examined. However, the requirement of rev3 for the production of G{middot}C -> T{middot}A transversions by the rad18 mutator, which induces only these substitutions, was similar to that for rad6-mediated G{middot}C -> T{middot}A transversion. This supports a role for the Rad6-Rad18 protein complex in the control of spontaneous mutagenesis. The available data imply that the putative Rev3 polymerase can process a variety of spontaneous DNA lesions that normally are substrates for error-free repair.
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