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ASSOCIATION OF CHROMOSOME LOSS WITH CENTROMERE-ADJACENT MITOTIC RECOMBINATION IN A YEAST DISOMIC HAPLOID
D. A. Campbell 1 and S. Fogel 1
1 Department of Genetics, University of California, Berkeley,
California 94720
Experiments designed to characterize the association between disomic chromosome loss and centromere-adjacent mitotic recombination were performed. Mitotic gene convertants were selected at two heteroallelic sites on the left arm of disomic chromosome III and tested for coincident chromosome loss. The principal results are: (1) Disomic chromosome loss is markedly enhanced (nearly 40-fold) over basal levels among mitotic gene convertants selected to arise close to the centromere; no such enhancement is observed among convertants selected to arise relatively far from the centromere. (2) Chromosome loss is primarily associated with proximal allele conversion at the centromere-adjacent site, and many of these convertants are reciprocally recombined in the adjacent proximal interval. (3) Partial aneuploid exceptions provisionally identified as carrying left arm telocentrics have been found. A testable model is proposed suggesting that centromere involvement in genetic recombination may precipitate segregational disfunction leading to mitotic chromosome loss.
Submitted on August 13, 1976Revised on December 15, 1976
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