Prophase I arrest and progression to metaphase I in mouse oocytes are controlled by Emi1-dependent regulation of APC(Cdh1) (Journal article)

Marangos, P./ Verschuren, E. W./ Chen, R./ Jackson, P. K./ Carroll, J.


Mammalian oocytes are arrested in prophase of the first meiotic division. Progression into the first meiotic division is driven by an increase in the activity of maturation-promoting factor (MPF). In mouse oocytes, we find that early mitotic inhibitor 1 (Emi1), an inhibitor of the anaphase-promoting complex (APC) that is responsible for cyclin B destruction and inactivation of MPF, is present at prophase I and undergoes Skp1-Cul1-F-box/betaTrCP-mediated destruction immediately after germinal vesicle breakdown (GVBD). Exogenous Emi1 or the inhibition of Emi1 destruction in prophase-arrested oocytes leads to a stabilization of cyclin B1-GFP that is sufficient to trigger GVBD. In contrast, the depletion of Emi1 using morpholino oligonucleotides increases cyclin B1-GFP destruction, resulting in an attenuation of MPF activation and a delay of entry into the first meiotic division. Finally, we show that Emi1-dependent effects on meiosis I require the presence of Cdh1. These observations reveal a novel mechanism for the control of entry into the first meiotic division: an Emi1-dependent inhibition of APC(Cdh1).
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών
Keywords: 3T3 Cells,Animals,Cell Cycle Proteins/*metabolism,Cyclin B/metabolism,Embryo, Mammalian/cytology/metabolism,F-Box Proteins/*metabolism,Female,Gene Expression Regulation,Humans,Meiosis,*Meiotic Prophase I,*Metaphase,Mice,Mitotic Spindle Appa
URI: http://olympias.lib.uoi.gr/jspui/handle/123456789/7723
ISSN: 0021-9525
Link: http://www.ncbi.nlm.nih.gov/pubmed/17190794
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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