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Related Experiment Videos

Laterally mobile, cortical tension elements can self-assemble into a contractile ring.

J G White1

  • 1MRC Laboratory of Molecular Biology, Cambridge, England.

Annals of the New York Academy of Sciences
|January 1, 1990
PubMed
Summary

Animal cells divide using a contractile ring of actomyosin filaments. The mitotic spindle organizes this ring, ensuring equal chromosome distribution during cytokinesis.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Animal cell division (cytokinesis) involves equatorial constriction.
  • A circumferential actomyosin contractile ring drives this process.
  • The mitotic apparatus guides ring formation and placement but doesn't actively furrow.

Purpose of the Study:

  • To elucidate the mechanism by which the mitotic apparatus organizes the contractile ring.
  • To understand how cortical tension gradients contribute to cytokinesis.

Main Methods:

  • The study proposes a model based on existing knowledge of cell mechanics and the mitotic apparatus.
  • It analyzes the role of cortical tension modulation and filament flow.

Main Results:

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  • The mitotic apparatus locally modulates force in cortical contractile filaments.
  • Gradients of cortical tension direct filaments to equatorial regions.
  • Geometric distortions orient filaments circumferentially, leading to a self-sharpening furrow.

Conclusions:

  • The mitotic apparatus organizes the contractile ring via tension gradients, not direct action.
  • This mechanism ensures precise chromosome partitioning during cell division.
  • Similar filament dynamics may apply to cell locomotion and growth cone extension.