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. 1990 Jun;172(6):3009–3014. doi: 10.1128/jb.172.6.3009-3014.1990

Specificity of the mutator effect caused by disruption of the RAD1 excision repair gene of Saccharomyces cerevisiae.

B A Kunz 1, L Kohalmi 1, X L Kang 1, K A Magnusson 1
PMCID: PMC209101  PMID: 2160935

Abstract

Disruption of RAD1, a gene controlling excision repair in the yeast Saccharomyces cerevisiae, increased the frequency of spontaneous forward mutation in a plasmid-borne copy of the SUP4-o gene. To characterize this effect in detail, a collection of 249 SUP4-o mutations arising spontaneously in the rad1 strain was analyzed by DNA sequencing. The resulting mutational spectrum was compared with that derived from an examination of 322 spontaneous SUP4-o mutations selected in an isogenic wild-type (RAD1) strain. This comparison revealed that the rad1 mutator phenotype was associated with increases in the frequencies of single-base-pair substitution, single-base-pair deletion, and insertion of the yeast retrotransposon Ty. In the rad1 strain, the relative fractions of these events and their distributions within SUP4-o exhibited features similar to those for spontaneous mutagenesis in the isogenic RAD1 background. The increase in the frequency of Ty insertion argues that Ty transposition can be activated by unrepaired spontaneous DNA damage, which normally would be removed by excision repair. We discuss the possibilities that either translesion synthesis, a reduced fidelity of DNA replication, or a deficiency in mismatch correction might be responsible for the majority of single-base-pair events in the rad1 strain.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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