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Related Experiment Videos

mos proto-oncogene function.

G F Vande Woude1, R Buccione, I Daar

  • 1BRI-Basic Research Program, NCI-Frederick Cancer Research Facility, MD 21701.

Ciba Foundation Symposium
|January 1, 1990
PubMed
Summary
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p39mos protein initiates oocyte maturation by inducing maturation promoting factor (MPF) activation. Blocking p39mos synthesis halts meiosis in Xenopus and mouse oocytes, demonstrating its essential role throughout maturation.

Area of Science:

  • Cellular and Molecular Biology
  • Developmental Biology
  • Reproductive Biology

Background:

  • Oocyte maturation involves resuming meiosis, regulated by Maturation Promoting Factor (MPF).
  • Progesterone triggers MPF activation and maturation in Xenopus oocytes, requiring protein synthesis.
  • An inactive MPF form, pre-MPF, is present in fully grown oocytes.

Purpose of the Study:

  • To investigate the role of p39mos in initiating and regulating oocyte meiotic maturation.
  • To determine if p39mos is essential for MPF activation and germinal vesicle breakdown (GVBD).
  • To assess the function of p39mos throughout the entire maturation process in both Xenopus and mouse oocytes.

Main Methods:

  • Studied p39mos synthesis in progesterone-treated Xenopus oocytes.

Related Experiment Videos

  • Utilized antisense mos oligodeoxynucleotides microinjection in Xenopus and mouse oocytes.
  • Analyzed oocyte maturation progression, MPF activity, GVBD, and chromosome behavior.

    • Main Results:

    • p39mos synthesis is rapidly induced before MPF activation and GVBD in Xenopus oocytes.
    • Antisense inhibition of p39mos blocked maturation in both Xenopus (no MPF/GVBD) and mouse (arrested at metaphase I).
    • p39mos is required throughout oocyte maturation, not just for initiation.

    Conclusions:

    • p39mos acts as an initiator of oocyte maturation and is essential throughout the process.
    • p39mos likely activates pre-MPF, playing a critical role in meiotic resumption.
    • The findings suggest p39mos's conserved function in vertebrate oocyte maturation.