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GENE CONVERSION OF THE MATING-TYPE LOCUS IN SACCHAROMYCES CEREVISIAE
Amar J. S. Klar 1, Seymour Fogel 1, and Karin Lusnak 1
1 Department of Genetics, University of California, Berkeley, California 94720
Tetrad analysis of MATa/MAT
diploids of Saccharomyces cerevisiae generally yields 2 MATa:2MAT meiotic products. About 1 to 1.8% of the tetrads yield aberrant segregations for this marker. Described here are experiments that determine whether the aberrant meiotic segregations at the mating-type locus are ascribable to gene conversions or to MAT switches, that is, to mating-type interconversions. Diploid strains incapable of switching MATa to MAT, or the converse, nevertheless display changes of MATa to MAT, or the reverse. These events must be attributed to gene conversion. Further, we suggest that MATa and MAT alleles may represent nonhomologous sequences of DNA since they fail to display postmeiotic segregations.
Revised on October 11, 1978
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