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Galander, Stefan; Marston, Adèle L.
BioEssays, October 2020, Volume: 42, Issue: 10Journal Article
Research over the last two decades has identified a group of meiosis‐specific proteins, consisting of budding yeast Spo13, fission yeast Moa1, mouse MEIKIN, and Drosophila Mtrm, with essential functions in meiotic chromosome segregation. These proteins, which we call meiosis I kinase regulators (MOKIRs), mediate two major adaptations to the meiotic cell cycle to allow the generation of haploid gametes from diploid mother cells. Firstly, they promote the segregation of homologous chromosomes in meiosis I (reductional division) by ensuring that sister kinetochores face towards the same pole (mono‐orientation). Secondly, they safeguard the timely separation of sister chromatids in meiosis II (equational division) by counteracting the premature removal of pericentromeric cohesin, and thus prevent the formation of aneuploid gametes. Although MOKIRs bear no obvious sequence similarity, they appear to play functionally conserved roles in regulating meiotic kinases. Here, the known functions of MOKIRs are reviewed and their possible mechanisms of action are discussed. Also see the video here https://youtu.be/tLE9KL89bwk. MOKIRs (Meiosis One KInase Regulators) are meiosis‐specific proteins that orchestrate the segregation of homologous chromosomes. MOKIRs establish key features of meiosis I, including sister kinetochore mono‐orientation and protection of pericentromeric cohesin. This review focuses on how MOKIRs might control a number of kinases, notably Polo, to elicit these effects.
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