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Related Concept Videos

Spindle Assembly02:50

Spindle Assembly

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.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
Spindle Assembly02:50

Spindle Assembly

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.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
The Spindle Assembly Checkpoint02:19

The Spindle Assembly Checkpoint

The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
The Spindle Assembly Checkpoint02:19

The Spindle Assembly Checkpoint

The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
The Mitotic Spindle02:27

The Mitotic Spindle

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.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
The Mitotic Spindle02:27

The Mitotic Spindle

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.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...

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Related Experiment Video

Updated: Jun 19, 2026

Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
10:52

Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets

Published on: August 13, 2016

Anastral spindle assembly: a mathematical model.

Mark A Hallen1, Sharyn A Endow

  • 1Department of Cell Biology, Duke University Medical Center, Durham, North Carolina, USA.

Biophysical Journal
|October 22, 2009
PubMed
Summary
This summary is machine-generated.

This study models anastral spindle assembly in two stages: aster aggregation and microtubule elongation. Directed transport and microtubule sliding, driven by Ncd motor proteins, are key to forming functional spindles in Drosophila oocytes.

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Last Updated: Jun 19, 2026

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Area of Science:

  • Cell Biology
  • Biophysics
  • Developmental Biology

Background:

  • The formation of anastral spindles is crucial for cell division in many organisms.
  • Understanding the molecular mechanisms driving spindle assembly is essential for cell biology research.

Purpose of the Study:

  • To model the two-stage process of anastral spindle assembly.
  • To investigate the roles of microtubule dynamics, motor proteins, and chromosome interactions in spindle formation.

Main Methods:

  • Developed a two-stage model for anastral spindle assembly.
  • Investigated diffusion and directed transport for aster aggregation.
  • Formulated and numerically solved a differential-equation model for microtubule elongation and bipolarity.
  • Postulated Ncd motor proteins for cross-linking and sliding functions.

Main Results:

  • Identified directed transport of asters to chromosomes as a key initial step.
  • Demonstrated that microtubule cross-linking and sliding drive spindle elongation.
  • Showed that Ncd motor proteins likely perform both cross-linking and sliding functions.
  • Found that spindle formation involves rapid initial cross-linking followed by elongation.
  • Observed that inhibited sliding still allows short bipolar spindle formation, while enhanced clustering leads to normal-length spindles with longer assembly times.

Conclusions:

  • The model accurately reflects spindle assembly dynamics observed in Drosophila oocytes.
  • Microtubule cross-linking and sliding are critical for anastral spindle elongation and bipolarity.
  • The Ncd motor protein plays a significant role in spindle assembly through its dual functions.