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pubmed-article:15239953pubmed:abstractTextAccurate chromosome segregation relies on the precise regulation of mitotic progression. Regulation involves control over the timing of mitosis and a spindle assembly checkpoint that links anaphase onset to the completion of chromosome-microtubule attachment. In this paper, we combine live-cell imaging of HeLa cells and protein depletion by RNA interference to examine the functions of the Mad, Bub, and kinetochore proteins in mitotic timing and checkpoint control. We show that the depletion of any one of these proteins abolishes the mitotic arrest provoked by depolymerizing microtubules or blocking chromosome-microtubule attachment with RNAi. However, the normal progress of mitosis is accelerated only when Mad2 or BubR1, but not other Mad and Bub proteins, are inactivated. Moreover, whereas checkpoint control requires kinetochores, the regulation of mitotic timing by Mad2 and BubR1 is kinetochore-independent in fashion. We propose that cytosolic Mad2-BubR1 is essential to restrain anaphase onset early in mitosis when kinetochores are still assembling.lld:pubmed
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pubmed-article:15239953pubmed:dateRevised2009-11-19lld:pubmed
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pubmed-article:15239953pubmed:articleTitleTiming and checkpoints in the regulation of mitotic progression.lld:pubmed
pubmed-article:15239953pubmed:affiliationDepartment of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.lld:pubmed
pubmed-article:15239953pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:15239953pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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