Molecular Human Reproduction, Vol 4, 41-49, Copyright © 1998 by Oxford University Press
J Fulka Jr, NL First and RM Moor
The requisite endpoint of mammalian oocyte maturation, whether in vivo or
in vitro, is a metaphase II oocyte which is able to be fertilized and which
can eventually support normal embryonic development. Oocytes which have
been matured in vivo basically fulfill these criteria. On the other hand, a
completely different situation exists when these cells are isolated from
the ovaries and cultured in vitro. If they are too small (growing oocytes),
they do not undergo maturation, or, if more advanced, will mature only to
the metaphase I stage. Even in fully grown oocytes which are able to mature
to metaphase II, the developmental potential after fertilization is
disappointingly low, for reasons which remain unknown. The complexity of
certain factors (nuclear, cytoplasmic or arising from our current culture
systems) undoubtedly influences both the ability of oocytes to mature
fully, as well as their developmental potential after fertilization.
REVIEW, TUTORIAL
Nuclear and cytoplasmic determinants involved in the regulation of mammalian oocyte maturation
Institute of Animal Production, Prague, Czech Republic.
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