Abstract：
:Animal cell cytokinesis results from patterned activation of the small GTPase Rho, which directs assembly of actomyosin in the equatorial cortex. Cytokinesis is restricted to a portion of the cell cycle following anaphase onset in which the cortex is responsive to signals from the spindle. We show that shortly after anaphase onset oocytes and embryonic cells of frogs and echinoderms exhibit cortical waves of Rho activity and F-actin polymerization. The waves are modulated by cyclin-dependent kinase 1 (Cdk1) activity and require the Rho GEF (guanine nucleotide exchange factor), Ect2. Surprisingly, during wave propagation, although Rho activity elicits F-actin assembly, F-actin subsequently inactivates Rho. Experimental and modelling results show that waves represent excitable dynamics of a reaction-diffusion system with Rho as the activator and F-actin the inhibitor. We propose that cortical excitability explains fundamental features of cytokinesis including its cell cycle regulation.
journal_name
Nat Cell Bioljournal_title
Nature cell biologyauthors
Bement WM,Leda M,Moe AM,Kita AM,Larson ME,Golding AE,Pfeuti C,Su KC,Miller AL,Goryachev AB,von Dassow Gdoi
10.1038/ncb3251subject
Has Abstractpub_date
2015-11-01 00:00:00pages
1471-83issue
11eissn
1465-7392issn
1476-4679pii
ncb3251journal_volume
17pub_type
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