The cohesin-associated protein Pds5A governs the meiotic spindle assembly via deubiquitination of Kif5B in oocytes

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Abstract
Chromosome cohesion mediated by cohesin complex and its associated proteins is required for accurate chromosome segregation and genomic stability in mitosis. However, because of the distinct operation mechanisms, many proteins might exert different functions during meiosis in germ cells. Here, we document that cohesin-associated protein precocious dissociation of sisters 5A (Pds5A) plays a noncanonical role in the meiotic spindle assembly during oocyte maturation independent of its cohesion function. Pds5A distributes on the spindle fibers in oocytes at both metaphase I and metaphase II stages. Morpholino-based depletion or genetic ablation of Pds5A all lead to defects in spindle organization, chromosome euploidy and meiotic progression in oocytes and thus compromising the female fertility. Mechanistically, Pds5A recruits deubiquitinase ubiquitin-specific protease 14 to the spindle apparatus for stabilization of kinesin family member 5B, regulating the spindle elongation. Collectively, our findings unveil that cohesin-associated protein Pds5A can be used as a spindle regulator during oocyte meiosis.

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