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Related Concept Videos

The Spindle Assembly Checkpoint02:19

The Spindle Assembly Checkpoint

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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...
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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.
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...
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Separation of Sister Chromatids02:17

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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
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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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The Cell Cycle Control System01:28

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The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
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Attachment of Sister Chromatids02:57

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As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules.  Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall...
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Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes
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Principles and dynamics of spindle assembly checkpoint signalling.

Andrew D McAinsh1,2, Geert J P L Kops3,4

  • 1Centre for Mechanochemical Cell Biology, University of Warwick, Coventry, UK. a.d.mcainsh@warwick.ac.uk.

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Summary

The spindle assembly checkpoint (SAC) ensures accurate chromosome segregation during cell division. This review explores SAC protein interactions and signaling dynamics for robust cell cycle control.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Accurate chromosome segregation is essential for cell division, development, and tissue homeostasis.
  • The spindle assembly checkpoint (SAC) prevents premature anaphase by monitoring chromosome-microtubule interactions.
  • Kinetochores are key structures that mediate SAC signaling through mechanical and chemical cues.

Purpose of the Study:

  • To review the molecular mechanisms of SAC protein interactions and mitotic checkpoint complex (MCC) formation.
  • To highlight recent advances in understanding SAC signaling dynamics and interpretation of kinetochore attachment states.
  • To discuss SAC function in mammalian cells, including the role of the fibrous corona and remaining challenges.

Main Methods:

  • Literature review of recent advances in spindle assembly checkpoint research.
  • Analysis of SAC protein interactions and signaling pathways.
  • Discussion of kinetochore structure and function in chromosome segregation.

Main Results:

  • SAC proteins form the MCC, which inhibits the anaphase-promoting complex/cyclosome (APC/C) to halt anaphase.
  • Recent studies reveal SAC's dynamic signaling properties and its interpretation of diverse kinetochore attachment states.
  • Mammalian SAC signaling involves multisite kinetochores and the fibrous corona, with ongoing challenges in understanding fidelity.

Conclusions:

  • Understanding SAC mechanisms is crucial for ensuring high-fidelity chromosome segregation.
  • Further research is needed to fully elucidate SAC signaling in the context of complex kinetochore structures.
  • The SAC plays a vital role in preventing aneuploidy and maintaining genomic stability.