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Published 4 December 2006. doi:10.1083/jcb.200607159
The Rockefeller University Press, 0021-9525 $8.00
JCB, Volume 175, Number 5, 687-692
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Cracking up: symmetry breaking in cellular systems



Ewa Paluch1,2, Jasper van der Gucht3, and Cécile Sykes4

1 Max Planck Institute of Molecular Cell Biology and Genetics, Dresden 01307, Germany
2 International Institute of Molecular Cell Biology, 02-109 Warsaw, Poland
3 Laboratory of Physical Chemistry and Colloid Science, Wageningen University, 6701 BH Wageningen, Netherlands
4 Biomimetism of Cellular Movement, Unite Mixte de Recherches 168, Centre National de la Recherche Scientifique, Institut Curie, Universités Paris 6 and 7, 75231 Paris, Cedex 05, France

Correspondence to Cécile Sykes: cecile.sykes{at}curie.fr

The shape of animal cells is, to a large extent, determined by the cortical actin network that underlies the cell membrane. Because of the presence of myosin motors, the actin cortex is under tension, and local relaxation of this tension can result in cortical flows that lead to deformation and polarization of the cell. Cortex relaxation is often regulated by polarizing signals, but the cortex can also rupture and relax spontaneously. A similar tension-induced polarization is observed in actin gels growing around beads, and we propose that a common mechanism governs actin gel rupture in both systems.


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