A Spindle Assembly Checkpoint Protein Functions in Prophase I Arrest and Prometaphase Progression.
991 - 994.
Two critical stages of mammalian oocyte regulation are prophase I arrest, which is important for sustaining the oocyte pool, and the progression through meiosis I (MI) to produce fertilizable eggs. We have found that the spindle assembly checkpoint protein BubR1 regulates both stages in mouse oocytes. We show that oocytes depleted of BubR1 cannot sustain prophase I arrest and readily undergo germinal vesicle breakdown, a marker for reentry into MI. BubR1-depleted oocytes then arrest before completing MI, marked by failure of polar body extrusion. Both meiotic defects in BubR1-depleted oocytes are due to reduced activity of the master regulator known as the anaphase-promoting complex (APC), brought about through diminished levels of the APC coactivator Cdh1.
|Title:||A Spindle Assembly Checkpoint Protein Functions in Prophase I Arrest and Prometaphase Progression|
|Keywords:||MOUSE OOCYTES, PREVENTS ANEUPLOIDY, APC(CDH1) ACTIVITY, CYCLIN-B, M-PHASE, SECURIN, MAD2, PROTEOLYSIS, COMPLEX, ENTRY|
|UCL classification:||UCL > School of Life and Medical Sciences
UCL > School of Life and Medical Sciences > Faculty of Life Sciences
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