Mitotic slippage is determined by p31.sup.comet and the weakening of the spindle-assembly checkpoint
Mitotic slippage involves cells exiting mitosis without proper chromosome segregation. Although degradation of cyclin B1 during prolonged mitotic arrest is believed to trigger mitotic slippage, its upstream regulation remains obscure. Whether mitotic slippage is caused by APC/C.sup.CDC20 activity th...
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| Veröffentlicht in: | Oncogene 2020-03, Vol.39 (13), p.2819 |
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| creator | Lok, Tsun Ming Wang, Yang Xu, Wendy Kaichun Xie, Siwei Ma, Hoi Tang Poon, Randy Y. C |
| description | Mitotic slippage involves cells exiting mitosis without proper chromosome segregation. Although degradation of cyclin B1 during prolonged mitotic arrest is believed to trigger mitotic slippage, its upstream regulation remains obscure. Whether mitotic slippage is caused by APC/C.sup.CDC20 activity that is able to escape spindle-assembly checkpoint (SAC)-mediated inhibition, or is actively promoted by a change in SAC activity remains an outstanding issue. We found that a major culprit for mitotic slippage involves reduction of MAD2 at the kinetochores, resulting in a progressive weakening of SAC during mitotic arrest. A further level of control of the timing of mitotic slippage is through p31.sup.comet-mediated suppression of MAD2 activation. The loss of kinetochore MAD2 was dependent on APC/C.sup.CDC20, indicating a feedback control of APC/C to SAC during prolonged mitotic arrest. The gradual weakening of SAC during mitotic arrest enables APC/C.sup.CDC20 to degrade cyclin B1, cumulating in the cell exiting mitosis by mitotic slippage. |
| doi_str_mv | 10.1038/s41388-020-1187-6 |
| format | Article |
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The loss of kinetochore MAD2 was dependent on APC/C.sup.CDC20, indicating a feedback control of APC/C to SAC during prolonged mitotic arrest. 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The loss of kinetochore MAD2 was dependent on APC/C.sup.CDC20, indicating a feedback control of APC/C to SAC during prolonged mitotic arrest. The gradual weakening of SAC during mitotic arrest enables APC/C.sup.CDC20 to degrade cyclin B1, cumulating in the cell exiting mitosis by mitotic slippage.</description><subject>Cyclins</subject><subject>Enzymes</subject><subject>Gene expression</subject><subject>Genetic aspects</subject><subject>Health aspects</subject><subject>Mitosis</subject><subject>Regulation</subject><issn>0950-9232</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid/><recordid>eNptjk1LAzEYhHNQsFZ_gLeA513fbNp8HEvxo1Dx0nvJx5tt7G52aSLSf--iHjzIHAaGZ4Yh5I5BzYCrh7xgXKkKGqgYU7ISF2QGegmVbnhzRa5zfgcAqaGZEf8ay1Cio7mL42hapDFTjwVPfUzoqT3TkbM6f4y1G3os1CRPywHpJ5ojpphaOoTvII8x-Q4rkzP2tjtTd0B3HIeYyg25DKbLePvrc7J7etytX6rt2_NmvdpWrZDTO6u9BautEFYELQNK31hAIxXn3AmujQIwyqilX3InG-dcWOgFWimNQ8bn5P5ntjUd7mMKQzkZ18fs9ivBlFBKa5io-h9qksc-uiFhiFP-p_AFMJhmvw</recordid><startdate>20200326</startdate><enddate>20200326</enddate><creator>Lok, Tsun Ming</creator><creator>Wang, Yang</creator><creator>Xu, Wendy Kaichun</creator><creator>Xie, Siwei</creator><creator>Ma, Hoi Tang</creator><creator>Poon, Randy Y. 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| fulltext | fulltext |
| identifier | ISSN: 0950-9232 |
| ispartof | Oncogene, 2020-03, Vol.39 (13), p.2819 |
| issn | 0950-9232 |
| language | eng |
| recordid | cdi_gale_infotracmisc_A618688990 |
| source | Alma/SFX Local Collection |
| subjects | Cyclins Enzymes Gene expression Genetic aspects Health aspects Mitosis Regulation |
| title | Mitotic slippage is determined by p31.sup.comet and the weakening of the spindle-assembly checkpoint |
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