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How does Xenopus oocyte acquire its competence to undergo meiotic maturation?
Author(s) -
Jessus Catherine,
Ozon René
Publication year - 2004
Publication title -
biology of the cell
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.543
H-Index - 85
eISSN - 1768-322X
pISSN - 0248-4900
DOI - 10.1016/j.biolcel.2003.12.007
Subject(s) - xenopus , oocyte , biology , oogenesis , meiosis , maturation promoting factor , microbiology and biotechnology , cyclin dependent kinase 1 , prophase , genetics , cell cycle , gene , embryo
Summry— During Xenopus oogenesis, the follicle‐enclosed oocyte, arrested at the diplotene stage of meiotic prophase, accumulates pre‐MPF. Pre‐MPF is an heterodimer formed of cyclin B2 and Cdc2 protein kinase, which is maintained inactive by inhibitory phosphorylations on Thr14 and Tyr15. When the oocyte reaches its full size, it becomes competent to respond to progesterone and to activate MPF through a positive feedback loop. In this paper, we present experimental data indicating that the molecular network involved in the autoamplification loop of MPF is progressively established during late oogenesis.