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- W2072840123 abstract "Signaling pathways within the mitotic mechanism temporally orchestrate spindle assembly with chromosome capture and alignment, and then coordinate initiation of chromosome segregation with spindle breakdown and cytokinesis for reproductive success. Kinetochore localized Mad2p acts in the spindle assembly checkpoint pathway during prophase and prometaphase to monitor bipolar attachment of chromosomes to spindle microtubules as well as proper tension at kinetochores. Once established, Mad2p is not degraded, but instead transits to spindle poles preceding the metaphase/anaphase transition in human and yeast cells. Whether conserved relocalization of Mad2p to poles is a final step in the spindle assembly checkpoint pathway or whether the post-metaphase transition allows Mad2p to cooperate in anaphase events leading to mitotic exit has been unknown. We examined post-metaphase localization of Mad2p in fission yeast. Our observations indicate an extended signaling pathway for Mad2p that includes kinetochore to bipolar localization at spindle poles, then additional transitions from bipolar to unipolar to equatorial. We determined that Mad2p associates with the microtubule organizing center complex through direct binding to Alp4p and that microtubule motor proteins Kinesin-14 Pkl1 and Dynein contribute to Mad2p anaphase transitions. At anaphase B onset, bipolar to unipolar transitions of both Mad2p and the septation inititiation network (SIN) kinase Cdc7 are observed. We determined that Mad2p and Cdc7p transitions monitor different events in anaphase, but that neither are required for anaphase B initiation. Our findings indicate that altered Mad2p anaphase spindle localizations can reflect changes in spindle function during mitotic exit that could contribute to fidelity in anaphase events." @default.
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- W2072840123 date "2006-06-14" @default.
- W2072840123 modified "2023-10-14" @default.
- W2072840123 title "An Extended Anaphase Signaling Pathway for Mad2p Includes Microtubule Organizing Center Proteins and Multiple Motor-dependent Transitions" @default.
- W2072840123 doi "https://doi.org/10.4161/cc.5.13.2912" @default.
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