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J Cell Biol 2005 Jul 04;1701:91-101. doi: 10.1083/jcb.200501131.
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A microtubule-dependent zone of active RhoA during cleavage plane specification.

Bement WM , Benink HA , von Dassow G .

Cytokinesis in animal cells results from the assembly and constriction of a circumferential array of actin filaments and myosin-2. Microtubules of the mitotic apparatus determine the position at which the cytokinetic actomyosin array forms, but the molecular mechanisms by which they do so remain unknown. The small GTPase RhoA has previously been implicated in cytokinesis. Using four-dimensional microscopy and a probe for active RhoA, we show that active RhoA concentrates in a precisely bounded zone before cytokinesis and is independent of actin assembly. Cytokinetic RhoA activity zones are common to four echinoderm species, the vertebrate Xenopus laevis, and the highly asymmetric cytokinesis accompanying meiosis. Microtubules direct the formation and placement of the RhoA activity zone, and the zone is repositioned after physical spindle displacement. We conclude that microtubules specify the cytokinetic apparatus via a dynamic zone of local RhoA activity.

PubMed ID: 15998801
PMC ID: PMC2171391
Article link: J Cell Biol
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: actl6a rhoa rhoa.2

Article Images: [+] show captions
References [+] :
Abraham, Mutations in alpha- and beta-tubulin affect spindle formation in Chinese hamster ovary cells. 1983, Pubmed