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Nuclear-cytoplasmic interactions during ovine oocyte maturation.

F Z Sun1, R M Moor

  • 1Department of Molecular Embryology, AFRC Institute of Animal Physiology, Cambridge, UK.

Development (Cambridge, England)
|January 1, 1991
PubMed
Summary

Ovine oocyte maturation involves cytoplasmic control over protein synthesis changes, not nuclear factors. Removing the nucleus does not impede chromatin condensation or protein reprogramming during maturation.

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Area of Science:

  • Reproductive Biology
  • Cell Biology
  • Molecular Biology

Background:

  • Oocyte maturation is a critical process involving significant cellular and molecular changes.
  • Understanding the interplay between the nucleus and cytoplasm is key to deciphering developmental control.

Purpose of the Study:

  • To investigate nucleus-cytoplasm interactions during ovine oocyte meiotic maturation.
  • To determine the role of the nucleus in regulating protein synthesis and chromatin condensation.

Main Methods:

  • Microsurgical enucleation of ovine oocytes at the dictyate stage.
  • Analysis of newly synthesized polypeptides during maturation.
  • Assessment of chromatin condensation post-enucleation.

Main Results:

  • Newly synthesized polypeptides are sequestered in the oocyte nucleus early in maturation.
  • Oocyte enucleation before germinal vesicle breakdown (GVBD) did not prevent post-metaphase protein synthesis changes.
  • Chromatin condensation ability developed independently of the oocyte nucleus.

Conclusions:

  • Nuclear factors are not essential for initiating or progressing protein reprogramming during oocyte maturation.
  • Cytoplasmic factors, rather than nuclear factors, primarily control translational changes during ovine oocyte maturation.

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