Control of the initiation of meiosis was examined in diploids of yeast homozygous for two temperature-sensitive mutations, cyr1 and CYR3, which are defective in adenylate cyclase and cAMP-dependent protein kinase, respectively. The cyr1 and CYR3 mutations permitted the initiation of meiosis, but resulted in the frequent production of two-spored asci at the restrictive temperature. Unlike the wild-type diploid cells, the cyr1 and CYR3 homozygous diploid cells were capable of initiating meiosis even in nutrient growth media. This unique feature of the cyr1 and CYR3 mutants suggests that these mutations relate to the choice between mitotic and meiotic processes. In diploids homozygous for the bcy1 mutation that results in deficiency of the regulatory subunit of cAMP-dependent protein kinase and production of a high level of the catalytic subunit of this enzyme, no premeiotic DNA replication and commitment to intragenic recombination occurred, and no spores were formed. We conclude that the initiation of meiosis may be dependent upon the repression of cAMP production and the inactivation of cAMP-dependent protein kinase.

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Matsumoto K, Uno I, Ishikawa T

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