Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/117682
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Type: Journal article
Title: Timing of anaphase-promoting complex activation in mouse oocytes is predicted by microtubule-kinetochore attachment but not by bivalent alignment or tension
Author: Lane, S.I.R.
Yun, Y.
Jones, K.T.
Citation: Development (Cambridge), 2012; 139(11):1947-1955
Publisher: Company of Biologists
Issue Date: 2012
ISSN: 0950-1991
1477-9129
Statement of
Responsibility: 
Simon I. R. Lane, Yan Yun and Keith T. Jones
Abstract: Homologous chromosome segregation errors during meiosis I are common and generate aneuploid embryos. Here, we provide a reason for this susceptibility to mis-segregation by live cell imaging of mouse oocytes. Our results show that stable kinetochore-microtubule attachments form in mid-prometaphase, 3-4 hours before anaphase. This coincided with the loss of Mad2 from kinetochores and with the start of anaphase-promoting complex/cyclosome (APC/C)-mediated cyclin B1 destruction. Therefore, the spindle assembly checkpoint (SAC) ceased to inhibit the APC/C from mid-prometaphase. This timing did not coincide with bivalent congression in one-third of all oocytes examined. Non-aligned bivalents were weakly positive for Mad2, under less tension than congressed bivalents and, by live-cell imaging, appeared to be in the process of establishing correct bi-orientation. The time from when the APC/C became active until anaphase onset was affected by the rate of loss of CDK1 activity, rather than by these non-aligned bivalents, which occasionally persisted until anaphase, resulting in homolog non-disjunction. We conclude that, in oocytes, a few erroneous attachments of bivalent kinetochores to microtubules do not generate a sufficient SAC 'wait anaphase' signal to inhibit the APC/C.
Keywords: Cell cycle; oocyte; spindle assembly checkpoint; mouse
Rights: © 2012. Published by The Company of Biologists Ltd.
DOI: 10.1242/dev.077040
Grant ID: http://purl.org/au-research/grants/nhmrc/569202
http://purl.org/au-research/grants/arc/DP120100946
Appears in Collections:Aurora harvest 3
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