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Cytoplasmic remodelling and the acquisition of developmental competence in pig oocytes.

Anim. Reprod. Sci.2007 Mar;98(1-2):23-38. Epub 2006 Oct 21
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摘要


The progression of oocyte meiosis is accompanied by major changes in the ooplasm that play a key role in the completion of a coordinate nuclear and cytoplasmic maturation. We review evidence from the literature and present data obtained in our laboratory on different aspects of pig oocyte cytoplasm compartmentalization during maturation and early embryo development. In particular, we will discuss the changes in adenosine triphosphate (ATP) concentration and distribution taking place during the maturation process and their possible significance for oocyte developmental competence. We describe two important aspects of cytoplasmic streaming: mitochondrial distribution patterns in oocytes and early embryos and the complex rearrangements of cytoplasmic microtubule networks, while discussing their possible correlations with ooplasm compartmentalization. Recent evidence indicates that the cytoskeleton is used to shuttle not only organelles but also mRNAs to specific sites within the oocyte cytoplasm. Localization is driven by specific molecular motors belonging to the kinesin superfamily and requires the involvement of the RNA targeting molecule Staufen. We present recent experimental evidence, obtained in our laboratory, on the pig orthologues for kinesin KIF5B and Staufen, describe their expression patterns and discuss their possible role in oocyte maturation.

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