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Cytoskeleton and cell cycle control during meiotic maturation of the mouse oocyte: integrating time and space

¹ UMR 7622 Biologie du Développement, CNRS-UPMC, 9 Quai St Bernard, 75005 Paris, France and ² Sackler Faculty of Medicine, Tel Aviv University, Ramat Aviv, 69978, Israel

Correspondence: Correspondence should be addressed to B Maro; Email: maro{at}ccr.jussieu.fr

During meiotic maturation of mammalian oocytes, two successive divisions occur without an intermediate phase of DNA replication, so that haploid gametes are produced. Moreover, these two divisions are asymmetric, to ensure that most of the maternal stores are retained within the oocyte. This leads to the formation of daughter cells with different sizes: the large oocyte and the small polar bodies. All these events are dependent upon the dynamic changes in the organization of the oocyte cytoskeleton (microtubules and microfilaments) and are highly regulated in time and space. We review here the current knowledge of the interplay between the cytoskeleton and the cell cycle machinery in mouse oocytes, with an emphasis on the two major activities that control meiotic maturation in vertebrates, MPF (Maturation promoting factor) and CSF (Cytostatic factor).

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