Journal
JOURNAL OF CELL BIOLOGY
Volume 166, Issue 1, Pages 61-71Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.200402157
Keywords
cytokinesis; contractile ring; Citron kinase; Rho GTPases; Drosophila
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Funding
- Medical Research Council [G9901264] Funding Source: Medline
- Medical Research Council [G9901264] Funding Source: researchfish
- MRC [G9901264] Funding Source: UKRI
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The contractile ring is a highly dynamic structure, but how this dynamism is accomplished remains unclear. Here, we report the identification and analysis of a novel Drosophila gene, sticky (sti), essential for cytokinesis in all fly proliferating tissues. sti encodes the Drosophila orthologue of the mammalian Citron kinase. RNA interference-mediated silencing of sti in cultured cells causes them to become multinucleate. Components of the contractile ring and central spindle are recruited normally in such STICKY-depleted cells that nevertheless display asymmetric furrowing and aberrant blebbing. Together with an unusual distribution of F-actin and Anillin, these phenotypes are consistent with defective organization of the contractile ring. sti shows opposite genetic interactions with Rho and Rac genes suggesting that these GTPases antagonistically regulate STICKY functions. Similar genetic evidence indicates that RacGAP50C inhibits Rac during cytokinesis. We discuss that antagonism between Rho and Rac pathways may control contractile ring dynamics during cytokinesis.
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