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Galbraith, A.M; Bullard, S.A; Jiao, K; Nau, J.J; Malone, R.E
Genetics (Austin), (Jun 1997), 19970601, 1997-Jun, 1997-06-01, Letnik: 146, Številka: 2Journal Article
Recombination is an essential part of meiosis: in almost all organisms, including Saccharomyces cerevisiae, proper chromosome segregation and the viability of meiotic products is dependent upon normal levels of recombination. In this article we examine the kinetics of the meiotic divisions in four mutants defective in the initiation of recombination. We find that mutations in any of three Early Exchange genes (REC104, REC114 or REC102) confer a phenotype in which the reductional division occurs earlier than in an isogenic wild-type diploid. We also present data confirming previous reports that strains with a mutation in the Early Exchange gene. MEI4 undergo the first division at about the same time as wild-type cells. The rec104 mutation is epistatic to the mei4 mutation for the timing of the first division. These observations suggest a possible relationship between the initiation of recombination and the timing of the reductional division. These data also allow these four Early Exchange genes examined to be distinguished in terms of their role in coordinating recombination with the reductional division.
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