Balance of actively generated contractile and resistive forces controls cytokinesis dynamics

Wendy Zhang, Douglas Robinson

Research output: Contribution to journalArticle

Abstract

Cytokinesis, the fission of a mother cell into two daughter cells, is a simple and dramatic cell shape change. Here, we examine the dynamics of cytokinesis by using a combination of microscopy, dynamic measurements, and genetic analysis. We find that cytokinesis proceeds through a single sequence of shape changes, but the kinetics of the transformation from one shape to another differs dramatically between strains. We interpret the measurements in a simple and quantitative manner by using a previously uncharacterized analytic model. From the analysis, wild-type cytokinesis appears to proceed through an active, extremely regulated process in which globally distributed proteins generate resistive forces that slow the rate of furrow ingression. Finally, we propose that, in addition to myosin II, a Laplace pressure, resulting from material properties and the geometry of the dividing cell, generates force to help drive furrow ingression late in cytokinesis.

Original languageEnglish (US)
Pages (from-to)7186-7191
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume102
Issue number20
DOIs
StatePublished - May 17 2005

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Keywords

  • Cell dynamics
  • Cell mechanics
  • Dynacortin
  • Myosin II
  • RacE

ASJC Scopus subject areas

  • Genetics
  • General

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