Reference Report

Reference
Citation	Rusan, N.M., Peifer, M. (2007). A role for a novel centrosome cycle in asymmetric cell division. J. Cell Biol. 177(1): 13--20. (Export to RIS)
FlyBase ID	FBrf0201849
Publication Type	Research paper
PubMed ID	17403931
PubMed Abstract	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.
DOI	10.1083/jcb.200612140
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Language of Publication	English
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Publication Type	Journal
Abbreviation	J. Cell Biol.
Title	Journal of Cell Biology
Publication Year	1966-
ISBN/ISSN	0021-9525
Data from Reference
Alleles (12)
	Act5C^{Scer\UAS.T:Avic\GFP} asl² Avic\GFP^{Jupiter-G00147} cnn^{Scer\UAS.P\T.T:Avic\GFP} cp309^{PACT.Ubi-p63E.T:Avic\GFP} Eb1^{Scer\UAS.T:Avic\GFP} Hsap\TUBA1B^{Scer\UAS.T:Disc\RFP-mCherry} polo^T:Avic\GFP Scer\GAL4^insc-Mz1407 T:Disc\RFP^mCherry Uuuu\SAS-6^{T:Disc\RFP-mCherry} w^+mC
Constructs (7)
	P{GFP-polo} P{mCherry-SAS-6} P{UAS-Act5C.T:GFP} P{UAS-ChRFP-Tub} P{UAS-EB1-GFP} P{UASp-GFP-Cnn1} P{Ubi-p63E-GFP-cp309.PACT}
Genes (13)
	Act5C asl Avic\GFP cnn cp309 Eb1 Hsap\TUBA1B polo Scer\GAL4 T:Avic\GFP Uuuu\EB1 Uuuu\SAS-6 w
Insertions (2)
	P{GawB}insc^Mz1407 P{PTT-GA}Jupiter^G00147
Natural transposons (1)
	P-element