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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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The Mitotic Spindle02:27

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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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Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
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Kinetochore components are required for central spindle assembly.

Gilliane Maton1, Frances Edwards1, Benjamin Lacroix1

  • 1Institut Jacques Monod, CNRS, UMR 7592, University Paris Diderot, Sorbonne Paris Cité F-75205 Paris, France.

Nature Cell Biology
|April 14, 2015
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Summary
This summary is machine-generated.

The kinetochore initiates central spindle assembly, a key step in cell division. This process involves specific proteins and regulates chromosome segregation and cytokinesis.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The central spindle is crucial for coordinating chromosome segregation and cell division plane specification.
  • It acts as a signaling center for proteins involved in division plane specification and contractile ring constriction.
  • Molecular mechanisms governing the initial stages of central spindle assembly are not fully understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms controlling the initiation of central spindle assembly.
  • To investigate the role of kinetochores in central spindle formation.
  • To understand how chromosome segregation is coordinated with cytokinesis.

Main Methods:

  • Utilized Caenorhabditis elegans zygotes as a model system.
  • Investigated the function of microtubule-bundling protein SPD-1 (PRC1) and motor ZEN-4 (MKLP-1).
  • Examined the role of kinetochore proteins including KNL-1, BUB-1, HCP-1/2 (CENP-F), and CLS-2 (CLASP), and protein phosphatase 1.

Main Results:

  • SPD-1 (PRC1) and ZEN-4 (MKLP-1) are essential for central spindle elongation.
  • Kinetochore recruitment of KNL-1 and its downstream partners (BUB-1, HCP-1/2, CLS-2) is critical for initiating central spindle assembly.
  • Kinetochore-associated protein phosphatase 1 negatively regulates this process.
  • CLS-2 (CLASP) promotes initial central spindle microtubule assembly via its polymerase activity.

Conclusions:

  • The kinetochore plays a critical role in initiating central spindle assembly.
  • A conserved kinetochore protein network links chromosome segregation with cytokinesis.
  • This study reveals an unexpected mechanism coupling chromosome segregation and cell division.