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[Cell division and the microtubular cytoskeleton].

K Izutsu1

  • 1Department of Pathology, Mie University School of Medicine.

Human Cell
|June 1, 1991
PubMed
Summary

Chromosome movement during cell division is driven by kinetochore microtubules. The exact mechanism, whether self-propulsion or external pulling, and the roles of microtubule motors in anaphase chromosome motion remain under investigation.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Kinetochore microtubules form after nuclear envelope breakdown, connecting spindle poles to chromosomes.
  • Chromosome-to-pole movement in anaphase is crucial for accurate cell division.
  • The precise forces and motors driving chromosome segregation are not fully elucidated.

Purpose of the Study:

  • To explore the mechanisms underlying anaphase chromosome movement.
  • To discuss the potential roles of various microtubule motors in chromosome segregation.
  • To review models for spindle elongation during anaphase.

Main Methods:

  • Review of existing literature on microtubule dynamics and chromosome segregation.
  • Analysis of experimental observations in various model organisms (diatoms, yeast, sea urchins).
  • Discussion of theoretical models for force generation in mitosis.

Main Results:

  • Chromosome movement is linked to kinetochore microtubules and potentially motor proteins.
  • Anaphase B spindle elongation may involve microtubule assembly and sliding.
  • ATP-dependent motors are implicated in microtubule sliding and spindle elongation.

Conclusions:

  • The motive force for chromosome-to-pole movement likely originates at or near the kinetochore.
  • Both chromosome self-propulsion and poleward pulling by traction fibers are considered possibilities.
  • Microtubule motors such as dynein and kinesin are potential contributors to anaphase chromosome dynamics.

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