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• W2466949092 abstract "RacGAP1 is one of the two components of the centralspindlin complex essential for orchestrating cytokinesis in all animal cells. We report here that the early arrest mutant ogre is a maternal and zygotic loss of function mutation in the zebrafish homolog of racgap1. Like the other model organisms in which racgap1 is mutated, cells in the mutant stop dividing. In vivo cell recordings reveal that gradual loss of wild-type RacGAP1 leads progressively from a failure of abscission, then to cleavage furrow ingression, and finally complete absence of furrow formation. Despite the lack of cytokinesis, gross patterning occurs overtly normally in ogre mutants and cells continue to cycle slowly, some even attaining four or eight nuclei. Many multinucleate cells differentiate and survive, but the majority of cells enter apoptosis that we demonstrate is due to cumulative rounds of defective cytokinesis. Investigation of the cells that differentiate in the mutant indicate that RacGAP1 is also needed for long-term survival of motoneurons and the cytoskeletal organization of sensory axons. We conclude that while RacGAP1 function is crucial for cytokinesis and its activity at different levels controls different aspects of cytokinesis, these defects have occluded other critical roles of this interesting protein." @default.
• W2466949092 created "2016-07-22" @default.
• W2466949092 creator A5007757442 @default.
• W2466949092 creator A5015651996 @default.
• W2466949092 creator A5033139011 @default.
• W2466949092 creator A5085611535 @default.
• W2466949092 date "2016-10-01" @default.
• W2466949092 modified "2023-10-06" @default.
• W2466949092 title "Progressive loss of RacGAP1/ ogre activity has sequential effects on cytokinesis and zebrafish development" @default.
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