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THE ROLE OF S. CEREVISIAE CELL DIVISION CYCLE GENES IN NUCLEAR FUSION
Susan K. Dutcher 1 and Leland H. Hartwell 1
1 Department of Genetics, University of Washington, Seattle, Washington 98195
Forty temperature-sensitive cell division cycle (cdc) mutants of Saccharomyces cerevisiae were examined for their ability to complete nuclear fusion during conjugation in crosses to a CDC parent strain at the restrictive temperature. Most of the cdc mutant alleles behaved as the CDC parent strain from which they were derived, in that zygotes produced predominantly diploid progeny with only a small fraction of zygotes giving rise to haploid progeny (cytoductants) that signalled a failure in nuclear fusion. However, cdc4 mutants exhibited a strong nuclear fusion (karyogamy) defect in crosses to a CDC parent and cdc28, cdc34 and cdc37 mutants exhibited a weak karyogamy defect. For all four mutants, the karyogamy defect and the cell cycle defect cosegregated, suggesting that both defects resulted from a single lesion for each of these cdc mutants. Therefore, the cdc 4, 28, 34 and 37 gene products are required in both cell division and karyogamy.
Submitted on September 22, 1980Revised on July 7, 1981
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