Journal
JOURNAL OF CELL BIOLOGY
Volume 211, Issue 6, Pages 1113-1120Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.201507006
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Funding
- Ministry of Education, Culture, Sports, Science and Technology-Japan [15H01317]
- Wellcome Trust [081849, 086574, 092076, 098030, 099827]
- National Institutes of Health [GM10955]
- Grants-in-Aid for Scientific Research [15H01317, 26711012] Funding Source: KAKEN
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The critical step in meiosis is to attach homologous chromosomes to the opposite poles. In mouse oocytes, stable microtubule end-on attachments to kinetochores are not established until hours after spindle assembly, and phosphorylation of kinetochore proteins by Aurora B/C is responsible for the delay. Here we demonstrated that microtubule ends are actively prevented from stable attachment to kinetochores until well after spindle formation in Drosophila melanogaster oocytes. We identified the microtubule catastrophe-promoting complex Sentin-EB1 as a major factor responsible for this delay. Without this activity, microtubule ends precociously form robust attachments to kinetochores in oocytes, leading to a high proportion of homologous kinetochores stably attached to the same pole. Therefore, regulation of microtubule ends provides an alternative novel mechanism to delay stable kinetochore microtubule attachment in oocytes.
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