Synchronous Induction of Meiosis in the Fission Yeast Schizosaccharomyces pombe .

In fission yeast Schizosaccharomyces pombe, initiation of meiosis is repressed by Pat1 kinase. This protocol describes how ectopic inactivation of the temperature-sensitive Pat1-114 kinase in G1 -arrested h- / h- diploid cells carrying mat1-Pc induces a highly synchronized commitment to and execution of meiosis. Haploid or diploid pat1 -114 mutants without mat1-Pc can also be used for convenience, although less synchrony may be attained compared with induction using true diploids. An essentially identical protocol can be used for induction via inhibition of genetically sensitized Pat1 kinase by ATP analogs.