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Related Concept Videos

The Spindle Assembly Checkpoint02:19

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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.
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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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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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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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Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes
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Attachment issues: kinetochore transformations and spindle checkpoint silencing.

Banafsheh Etemad1, Geert J P L Kops2

  • 1Hubrecht Institute - KNAW (Royal Netherlands Academy of Arts and Sciences), Uppsalalaan 8, 3584 CT Utrecht, The Netherlands.

Current Opinion in Cell Biology
|March 8, 2016
PubMed
Summary
This summary is machine-generated.

The spindle assembly checkpoint (SAC) ensures correct chromosome segregation during cell division. Recent findings reveal how kinetochore-microtubule attachments silence the SAC, a crucial step for cell cycle progression.

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Related Experiment Videos

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Live Cell Imaging to Assess the Dynamics of Metaphase Timing and Cell Fate Following Mitotic Spindle Perturbations
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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Cell division requires precise chromosome segregation, regulated by the spindle assembly checkpoint (SAC).
  • The SAC prevents anaphase onset until all chromosomes are properly attached to spindle microtubules.
  • Kinetochore-microtubule interactions are key to SAC signaling and silencing.

Purpose of the Study:

  • To review recent advances in understanding kinetochore dynamics during SAC silencing.
  • To identify unresolved questions in the field of spindle assembly checkpoint regulation.
  • To advocate for a comprehensive approach to studying kinetochore-microtubule interactions.

Main Methods:

  • Literature review of recent findings on kinetochore-microtubule dynamics.
  • Analysis of molecular mechanisms governing SAC signaling and silencing.
  • Discussion of current challenges and future directions in cell cycle research.

Main Results:

  • Microtubule attachment to kinetochores triggers molecular changes that lead to SAC silencing.
  • Unattached kinetochores generate an anaphase inhibitor, which is suppressed upon microtubule capture.
  • The precise molecular events at the kinetochore upon microtubule attachment are still under investigation.

Conclusions:

  • Understanding kinetochore molecular changes is vital for elucidating SAC mechanisms.
  • Holistic views of kinetochore dynamics are necessary for a complete understanding of SAC silencing.
  • Further research is needed to fully unravel the complexities of cell cycle regulation.