Casein Kinase 1 Coordinates Cohesin Cleavage, Gametogenesis, and Exit from M Phase in Meiosis II

Publication date: Available online 22 December 2016
Source:Developmental Cell
Author(s): Orlando Argüello-Miranda, Ievgeniia Zagoriy, Valentina Mengoli, Julie Rojas, Katarzyna Jonak, Tugce Oz, Peter Graf, Wolfgang Zachariae
Meiosis consists of DNA replication followed by two consecutive nuclear divisions and gametogenesis or spore formation. While meiosis I has been studied extensively, less is known about the regulation of meiosis II. Here we show that Hrr25, the conserved casein kinase 1δ of budding yeast, links three mutually independent key processes of meiosis II. First, Hrr25 induces nuclear division by priming centromeric cohesin for cleavage by separase. Hrr25 simultaneously phosphorylates Rec8, the cleavable subunit of cohesin, and removes from centromeres the cohesin protector composed of shugoshin and the phosphatase PP2A. Second, Hrr25 initiates the sporulation program by inducing the synthesis of membranes that engulf the emerging nuclei at anaphase II. Third, Hrr25 mediates exit from meiosis II by activating pathways that trigger the destruction of M-phase-promoting kinases. Thus, Hrr25 synchronizes formation of the single-copy genome with gamete differentiation and termination of meiosis.

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Teaser

Meiosis consists of two rounds of chromosome segregation, called meiosis I and II, followed by gamete formation. Argüello-Miranda, Zagoriy et al. show that in yeast, the conserved casein kinase 1δ Hrr25 coordinates the key events of meiosis II. The kinase induces chromatid segregation, gamete differentiation, and exit from meiosis II.


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