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Meiosis I Is Established through Division-Specific Translational Control of a Cyclin

2008; Cell Press; Volume: 133; Issue: 2 Linguagem: Inglês

10.1016/j.cell.2008.02.032

1097-4172

Thomas M. Carlile, Angelika Amon,

DNA Repair Mechanisms

In budding yeast, key meiotic events such as DNA replication, recombination, and the meiotic divisions are controlled by Clb cyclin-dependent kinases (Clb-CDKs). Using a novel synchronization procedure, we have characterized the activity of these Clb-CDKs and observed a surprising diversity in their regulation during the meiotic divisions. Clb1-CDK activity is restricted to meiosis I, and Clb3-CDK activity to meiosis II, through 5'UTR-mediated translational control of its transcript. The analysis of cells inappropriately producing Clb3-CDKs during meiosis I furthermore defines Clb3 as an inhibitor of the meiosis I chromosome segregation program. Our results demonstrate an essential role for Clb-CDK regulation in establishing the meiotic chromosome segregation pattern.