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Title: A role for a novel centrosome cycle in asymmetric cell division

Journal Article · · Journal of Cell Biology
 [1];  [1]
  1. University of North Carolina, Chapel Hill, NC (United States)

Tissue stem cells play a key role in tissue maintenance. Drosophila melanogaster central brain neuroblasts are excellent models for stem cell asymmetric division. Earlier work showed that their mitotic spindle orientation is established before spindle formation. We investigated the mechanism by which this occurs, revealing a novel centrosome cycle. In interphase, the two centrioles separate, but only one is active, retaining pericentriolar material and forming a “dominant centrosome.” This centrosome acts as a microtubule organizing center (MTOC) and remains stationary, forming one pole of the future spindle. The second centriole is inactive and moves to the opposite side of the cell before being activated as a centrosome/MTOC. This is accompanied by asymmetric localization of Polo kinase, a key centrosome regulator. Disruption of centrosomes disrupts the high fidelity of asymmetric division. We propose a two-step mechanism to ensure faithful spindle positioning: the novel centrosome cycle produces a single interphase MTOC, coarsely aligning the spindle, and spindle–cortex interactions refine this alignment.

Research Organization:
University of North Carolina, Chapel Hill, NC (United States)
Sponsoring Organization:
American Cancer Society; National Institutes of Health (NIH)
DOE Contract Number:
PF-06-108-CCG; GM67236
OSTI ID:
1625143
Journal Information:
Journal of Cell Biology, Vol. 177, Issue 1; ISSN 0021-9525
Publisher:
Rockefeller University Press
Country of Publication:
United States
Language:
English

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Initial neurogenesis in Drosophila: Initial neurogenesis in Drosophila journal March 2013
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Asymmetric inheritance of spindle microtubule-organizing centres preserves replicative lifespan journal July 2019
When fate follows age: unequal centrosomes in asymmetric cell division journal September 2014
Maintaining the proper connection between the centrioles and the pericentriolar matrix requires Drosophila Centrosomin journal August 2007
A Multicomponent Assembly Pathway Contributes to the Formation of Acentrosomal Microtubule Arrays in Interphase Drosophila Cells journal July 2008
A lateral belt of cortical LGN and NuMA guides mitotic spindle movements and planar division in neuroepithelial cells journal March 2011
Deletion of IFT20 in the mouse kidney causes misorientation of the mitotic spindle and cystic kidney disease journal November 2008
Emerging mechanisms of asymmetric stem cell division journal September 2018
The centrosome cycle: Centriole biogenesis, duplication and inherent asymmetries journal October 2011
Drosophila neuroblasts retain the daughter centrosome journal March 2011
Dynamic centriolar relocalization of Polo kinase and Centrobin in early mitosis primes centrosome asymmetry in fly neural stem cells posted_content June 2019
Mechanisms of asymmetric cell division: flies and worms pave the way journal May 2008
A molecular mechanism of mitotic centrosome assembly in Drosophila journal August 2014
Cell biological regulation of division fate in vertebrate neuroepithelial cells journal July 2011
Dual control of Kinesin-1 recruitment to microtubules by Ensconsin in Drosophila neuroblasts and oocytes journal January 2019
Drosophila neuroblasts as a new model for the study of stem cell self-renewal and tumour formation journal July 2014
Asymmetric centrosome inheritance maintains neural progenitors in the neocortex journal October 2009
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Organelle asymmetry for proper fitness, function, and fate journal May 2013
Centrobin controls mother–daughter centriole asymmetry in Drosophila neuroblasts journal January 2013
Robust control of mitotic spindle orientation in the developing epidermis journal November 2010
Drosophila Ana2 is a conserved centriole duplication factor journal February 2010
Asymmetric mitosis: Unequal segregation of proteins destined for degradation journal May 2008
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Balancing self-renewal and differentiation by asymmetric division: Insights from brain tumor suppressors in Drosophila neural stem cells journal January 2012
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A systematic review of the asymmetric inheritance of cellular organelles in eukaryotes: A critique of basic science validity and imprecision journal May 2017
Centrosome misorientation reduces stem cell division during ageing journal December 2008
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A Multicomponent Assembly Pathway Contributes to the Formation of Acentrosomal Microtubule Arrays in Interphase Drosophila Cells text January 2008
Klp10A, a stem cell centrosome-enriched kinesin, balances asymmetries in Drosophila male germline stem cell division journal November 2016
The Mitotic Exit Network Regulates Spindle Pole Body Selection During Sporulation of Saccharomyces cerevisiae journal April 2017
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