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Published online
doi:10.1083/jcb.200907161
The Journal of Cell Biology, Vol. 188, No. 2, 199-207
The Rockefeller University Press, 0021-9525 $30.00
© Oh et al.
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Wee1B, Myt1, and Cdc25 function in distinct compartments of the mouse oocyte to control meiotic resumption



Jeong Su Oh1, Seung Jin Han2, and Marco Conti1

1 Department of Obstetrics, Gynecology, and Reproductive Sciences, Center for Reproductive Sciences, University of California, San Francisco, San Francisco, CA 94143
2 School of Biological Sciences, College of Biomedical Science and Engineering, Inje University, Gimhae, Gyeongnam 621-749, Korea

Correspondence to Marco Conti: contim{at}obgyn.ucsf.edu

After a long period of quiescence at dictyate prophase I, termed the germinal vesicle (GV) stage, mammalian oocytes reenter meiosis by activating the Cdc2–cyclin B complex (maturation-promoting factor [MPF]). The activity of MPF is regulated by Wee1/Myt1 kinases and Cdc25 phosphatases. In this study, we demonstrate that the sequestration of components that regulate MPF activity in distinct subcellular compartments is essential for their function during meiosis. Down-regulation of either Wee1B or Myt1 causes partial meiotic resumption, and oocytes reenter the cell cycle only when both proteins are down-regulated. Shortly before GV breakdown (GVBD), Cdc25B is translocated from the cytoplasm to the nucleus, whereas Wee1B is exported from the nucleus to the cytoplasm. These movements are regulated by PKA inactivation and MPF activation, respectively. Mislocalized Wee1B or Myt1 is not able to maintain meiotic arrest. Thus, cooperation of Wee1B, Myt1, and Cdc25 is required to maintain meiotic arrest and relocation of these components before GVBD is necessary for meiotic reentry.

Abbreviations used in this paper: GV, germinal vesicle; GVBD, GV breakdown; MO, morpholino oligonucleotide; MPF, maturation-promoting factor; NES, nuclear export signal; PMSG, pregnant mare's serum gonadotropin; WT, wild type.

© 2010 Oh et al.
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