Abstract
Semi-dominant mutants displaying greatly elevated (up to 200-fold above control) levels of spontaneous mitotic recombination have been isolated in a disomic haploid strain of yeast heteroallelic at the arg4 locus. They are designated by the symbol MIC. The mutants variously exhibit associated sensitivity to UV and ionizing radiation and to methyl methanesulfonate, enhanced UV-induced mitotic recombination, and enhanced spontaneous forward mutation rates. Possible enzyme defects and involvement in repair and editing of DNA are discussed. The mutants are expected to simplify the analysis of recombination pathways in yeast.
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