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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The pachytene checkpoint in S. cerevisiae depends on Swe1- mediated phosphorylation of the cyclin-dependent kinase Cdc28.

Mutants defective in meiotic recombination and synaptonemal complex formation undergo checkpoint-mediated arrest in mid-meiotic prophase. In S. cerevisiae, this checkpoint requires Swe1, which phosphorylates and inactivates the cyclin-dependent kinase Cdc28. A swe1 deletion allows mutants that normally arrest in meiotic prophase to sporulate at wild-type levels, though sporulation is delayed. This delay is eliminated by overproducing Clb1, the major cyclin required for meiosis I. The Swe1 protein accumulates and is hyperphosphorylated in checkpoint-arrested cells. Our results suggest that meiotic arrest is mediated both by increasing Swe1 activity and limiting cyclin production, with Swe1 being the primary downstream target of checkpoint control. The requirement for Swe1 distinguishes the pachytene checkpoint from the DNA damage checkpoints operating in vegetative cells.[1]


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