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Functional Manipulation of Maternal Gene Products Using In Vitro Oocyte Maturation in Zebrafish
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Oocyte Maturation in Starfish.

Kazuyoshi Chiba1

  • 1Department of Biological Sciences, Ochanomizu University, Tokyo 112-8610, Japan.

Cells
|February 26, 2020
PubMed
Summary
This summary is machine-generated.

Hormone-induced oocyte maturation involves signaling pathways that increase intracellular pH and trigger germinal vesicle breakdown (GVBD). This ensures proper spindle assembly and fertilization competence in spawned oocytes.

Keywords:
SGKfertilizationintracellular pHoocyte maturationstarfish

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Area of Science:

  • Reproductive Biology
  • Cell Signaling
  • Molecular Endocrinology

Background:

  • Oocyte maturation is crucial for fertilization competence.
  • Hormonal signals initiate meiotic resumption in immature oocytes.
  • Starfish oocytes provide a model for studying oocyte maturation.

Purpose of the Study:

  • To elucidate the molecular mechanisms of 1-methyladenine-induced oocyte maturation in starfish.
  • To identify key signaling pathways regulating intracellular pH and meiotic progression.
  • To understand the role of SGK in controlling oocyte maturation events.

Main Methods:

  • Hormone stimulation (1-methyladenine) of starfish oocytes.
  • Analysis of G-protein activation and downstream signaling cascades.
  • Measurement of intracellular pH (pHi) and assessment of germinal vesicle breakdown (GVBD).

Main Results:

  • 1-methyladenine triggers Gα-GTP formation and Gβγ release.
  • Gβγ activates PI3K, TORC2, and PDK1, leading to SGK phosphorylation.
  • SGK activation increases pHi and phosphorylates Cdc25/Myt1, inducing cyclin B-Cdk1 activation and GVBD.

Conclusions:

  • A signaling cascade involving G-proteins, PI3K, TORC2, PDK1, and SGK mediates 1-methyladenine-induced oocyte maturation.
  • Increased pHi and GVBD, regulated by SGK, are essential for meiotic arrest at metaphase I and fertilization competence.
  • This pathway highlights conserved mechanisms in oocyte maturation across species.