Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Chk2 Regulates Cell Cycle Progression during Mouse Oocyte Maturation and Early Embryo Development

  • Dai, Xiao-Xin (College of Animal Science and Technology, Nanjing Agricultural University) ;
  • Duan, Xing (College of Animal Science and Technology, Nanjing Agricultural University) ;
  • Liu, Hong-Lin (College of Animal Science and Technology, Nanjing Agricultural University) ;
  • Cui, Xiang-Shun (Department of Animal Sciences, Chungbuk National University) ;
  • Kim, Nam-Hyung (Department of Animal Sciences, Chungbuk National University) ;
  • Sun, Shao-Chen (College of Animal Science and Technology, Nanjing Agricultural University)
  • Received : 2013.09.16
  • Accepted : 2013.12.13
  • Published : 2014.02.28
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Abstract

As a tumor suppressor homologue during mitosis, Chk2 is involved in replication checkpoints, DNA repair, and cell cycle arrest, although its functions during mouse oocyte meiosis and early embryo development remain uncertain. We investigated the functions of Chk2 during mouse oocyte maturation and early embryo development. Chk2 exhibited a dynamic localization pattern; Chk2 expression was restricted to germinal vesicles at the germinal vesicle (GV) stage, was associated with centromeres at pro-metaphase I (Pro-MI), and localized to spindle poles at metaphase I (MI). Disrupting Chk2 activity resulted in cell cycle progression defects. First, inhibitor-treated oocytes were arrested at the GV stage and failed to undergo germinal vesicle breakdown (GVBD); this could be rescued after Chk2 inhibition release. Second, Chk2 inhibition after oocyte GVBD caused MI arrest. Third, the first cleavage of early embryo development was disrupted by Chk2 inhibition. Additionally, in inhibitor-treated oocytes, checkpoint protein Bub3 expression was consistently localized at centromeres at the MI stage, which indicated that the spindle assembly checkpoint (SAC) was activated. Moreover, disrupting Chk2 activity in oocytes caused severe chromosome misalignments and spindle disruption. In inhibitor-treated oocytes, centrosome protein ${\gamma}$-tubulin and Polo-like kinase 1 (Plk1) were dissociated from spindle poles. These results indicated that Chk2 regulated cell cycle progression and spindle assembly during mouse oocyte maturation and early embryo development.

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References

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