Journal
DEVELOPMENTAL CELL
Volume 33, Issue 5, Pages 589-602Publisher
CELL PRESS
DOI: 10.1016/j.devcel.2015.04.020
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Funding
- JSPS [24770173, 26650072]
- Nakajima Foundation
- Uehara Memorial Foundation
- RIKEN CDB intramural grant
- Grants-in-Aid for Scientific Research [26650072, 24770173] Funding Source: KAKEN
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A model for mitosis suggests that correct kineto-chore-microtubule (KT-MT) attachments are stabilized by spatial separation of the attachment sites from Aurora B kinase through sister KT stretching. However, the spatiotemporal regulation of attachment stability during meiosis I (MI) in oocytes remains unclear. Here, we found that in mouse oocytes, Aurora B and C (B/C) are located in close proximity to KT-MT attachment sites after bivalent stretching due to an intrinsic property of the MI chromosomes. The Aurora B/C activity destabilizes correct attachments while allowing a considerable amount of incorrect attachments to form. KT-MT attachments are eventually stabilized through KT dephosphorylation by PP2A-B56 phosphatase, which is progressively recruited to KTs depending on the BubR1 phosphorylation resulting from the timer Cdk1 and independent of bivalent stretching. Thus, oocytes lack a mechanism for coordinating bivalent stretching and KT phosphoregulation during MI, which may explain the high frequency of KT-MT attachment errors.
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