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Dev Cell. 2014 Sep 29;30(6):731-45. doi: 10.1016/j.devcel.2014.08.007. Epub 2014 Sep 18.

Acentrosomal Drosophila epithelial cells exhibit abnormal cell division, leading to cell death and compensatory proliferation.

Author information

1
Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
2
Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
3
Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA. Electronic address: peifer@unc.edu.

Abstract

Mitotic spindles are critical for accurate chromosome segregation. Centrosomes, the primary microtubule nucleating centers of animal cells, play key roles in forming and orienting mitotic spindles. However, the survival of Drosophila without centrosomes suggested they are dispensable in somatic cells, challenging the canonical view. We used fly wing disc epithelia as a model to resolve these conflicting hypotheses, revealing that centrosomes play vital roles in spindle assembly, function, and orientation. Many acentrosomal cells exhibit prolonged spindle assembly, chromosome missegregation, DNA damage, misoriented divisions, and eventual apoptosis. We found that multiple mechanisms buffer the effects of centrosome loss, including alternative microtubule nucleation pathways and the spindle assembly checkpoint. Apoptosis of acentrosomal cells is mediated by JNK signaling, which also drives compensatory proliferation to maintain tissue integrity and viability. These data reveal the importance of centrosomes in fly epithelia and demonstrate the robust compensatory mechanisms at the cellular and organismal level.

PMID:
25241934
PMCID:
PMC4182331
DOI:
10.1016/j.devcel.2014.08.007
[Indexed for MEDLINE]
Free PMC Article

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