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Precocious centriole disengagement and centrosome fragmentation induced by mitotic delay

Author

Listed:
  • Menuka Karki

    (New Mexico State University)

  • Neda Keyhaninejad

    (New Mexico State University
    Center for Applied Genetic Technologies, University of Georgia)

  • Charles B. Shuster

    (New Mexico State University)

Abstract

The spindle assembly checkpoint (SAC) delays mitotic progression until all sister chromatid pairs achieve bi-orientation, and while the SAC can maintain mitotic arrest for extended periods, moderate delays in mitotic progression have significant effects on the resulting daughter cells. Here we show that when retinal-pigmented epithelial (RPE1) cells experience mitotic delay, there is a time-dependent increase in centrosome fragmentation and centriole disengagement. While most cells with disengaged centrioles maintain spindle bipolarity, clustering of disengaged centrioles requires the kinesin-14, HSET. Centrosome fragmentation and precocious centriole disengagement depend on separase and anaphase-promoting complex/cyclosome (APC/C) activity, which also triggers the acquisition of distal appendage markers on daughter centrioles and the loss of procentriolar markers. Together, these results suggest that moderate delays in mitotic progression trigger the initiation of centriole licensing through centriole disengagement, at which point the ability to maintain spindle bipolarity becomes a function of HSET-mediated spindle pole clustering.

Suggested Citation

  • Menuka Karki & Neda Keyhaninejad & Charles B. Shuster, 2017. "Precocious centriole disengagement and centrosome fragmentation induced by mitotic delay," Nature Communications, Nature, vol. 8(1), pages 1-12, August.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15803
    DOI: 10.1038/ncomms15803
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    Cited by:

    1. Shuwen He & John P. Gillies & Juliana L. Zang & Carmen M. Córdoba-Beldad & Io Yamamoto & Yasuhiro Fujiwara & Julie Grantham & Morgan E. DeSantis & Hiroki Shibuya, 2023. "Distinct dynein complexes defined by DYNLRB1 and DYNLRB2 regulate mitotic and male meiotic spindle bipolarity," Nature Communications, Nature, vol. 14(1), pages 1-15, December.

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