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Related Concept Videos

The Mitotic Spindle02:27

The Mitotic Spindle

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The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
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During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis. 
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Spindle Assembly02:50

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Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
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Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
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Related Experiment Video

Updated: Mar 21, 2026

Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
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Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets

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Self-Organization and Forces in the Mitotic Spindle.

Nenad Pavin1, Iva M Tolić2

  • 1Department of Physics, Faculty of Science, University of Zagreb, 10000 Zagreb, Croatia;

Annual Review of Biophysics
|May 6, 2016
PubMed
Summary

Cell division relies on a self-organized spindle, a complex machine of microtubules and proteins. This review explores how microtubule dynamics and forces drive chromosome segregation during cell division.

Keywords:
cross-linking proteinskinetochoresmicrotubulesmotor proteinsoscillationsspindle assembly

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Area of Science:

  • Cell Biology
  • Biophysics
  • Molecular Motors

Background:

  • Cell division requires precise chromosome segregation, orchestrated by the mitotic spindle.
  • The spindle is a dynamic structure that self-assembles from microtubules and proteins.
  • Understanding spindle self-organization and force generation is crucial for comprehending cell division.

Purpose of the Study:

  • To review the mechanisms underlying spindle self-organization.
  • To discuss the generation, balancing, and regulation of forces within the spindle.
  • To highlight the roles of microtubule dynamics and rotational movement in chromosome transport.

Main Methods:

  • This is a review article, synthesizing existing research.
  • It focuses on theoretical and experimental findings related to spindle assembly and function.
  • Analysis of microtubule dynamics, protein interactions, and force generation mechanisms.

Main Results:

  • Microtubule dynamics and rotational motion are key drivers of spindle self-organization.
  • Directed forces, precisely regulated in space and time, govern chromosome movement.
  • Interactions between microtubules and chromosomes are essential for accurate segregation.

Conclusions:

  • The mitotic spindle is a self-organized micromachine essential for cell division.
  • Understanding the interplay of microtubule dynamics and force regulation provides insights into chromosome segregation.
  • Further research into these mechanisms can illuminate fundamental aspects of cell proliferation and development.