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Cdc25C expression in meiotically competent and incompetent goat oocytes
Laurence Gall1, Sylvie Ruffini, Daniel Le Bourhis
1Unité de Physiologie animale, INRA, 78352 Jouy-en-Josas cedex, France. gall@jouy.inra.fr
Molecular Reproduction and Development
|April 5, 2002
Summary
Sufficient Cdc25C protein levels and its nuclear localization are crucial for acquiring meiotic competence in goat oocytes. This protein
Area of Science:
- Reproductive Biology
- Cellular Biology
- Molecular Biology
Background:
- Meiotic competence acquisition in oocytes is essential for successful reproduction.
- The cell cycle regulator Cdc25C plays a key role in cell cycle progression.
- Understanding Cdc25C dynamics during oocyte maturation is vital for reproductive science.
Purpose of the Study:
- To investigate the expression, phosphorylation, and localization of Cdc25C during goat oocyte maturation and meiotic competence acquisition.
- To determine the role of Cdc25C in regulating meiotic resumption and maturation.
Main Methods:
- Western blot analysis to assess Cdc25C expression and phosphorylation levels.
- Indirect immunofluorescence to determine Cdc25C localization within oocytes.
- Oocyte maturation and artificial activation protocols were employed.
Main Results:
- Cdc25C is constitutively expressed in competent goat oocytes, with phosphorylation levels changing during meiosis.
- A shift from 55 kDa (non-phosphorylated) to 70 kDa (hyperphosphorylated) form indicates Cdc25C activation during G2-M transition and meiosis resumption.
- Cdc25C expression increases with meiotic competence acquisition, and its nuclear localization at the germinal vesicle stage is essential.
- Okadaic acid induced premature meiosis resumption and Cdc25C hyperphosphorylation.
Conclusions:
- Meiosis resumption requires sufficient, fully phosphorylated, and nuclear Cdc25C.
- Cdc25C amount may be a limiting factor for meiotic competence acquisition in goat oocytes.
- Nuclear translocation and phosphorylation of Cdc25C during oocyte growth prepare oocytes for meiotic resumption.