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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.
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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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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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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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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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Microtubule function and architecture are regulated by an array of specialized proteins called microtubule-associated proteins or MAPs. These proteins are widespread across different organisms and have conserved protein motifs, like the multi-TOG domain for tubulin binding found in the CLASP family of MAPs. Some MAPs are lineage-specific based on their conserved domains. Their functions depend upon the cytoskeletal architecture and cell type they are located within. In-plant cells, a specific...
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Related Experiment Video

Updated: Mar 8, 2026

Live Cell Imaging to Assess the Dynamics of Metaphase Timing and Cell Fate Following Mitotic Spindle Perturbations
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Temporal and compartment-specific signals coordinate mitotic exit with spindle position.

Ayse Koca Caydasi1,2, Anton Khmelinskii3, Rafael Duenas-Sanchez1,2

  • 1DKFZ-ZMBH Alliance, Department of Cell and Tumour Biology, German Cancer Research Centre (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany.

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|January 25, 2017
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Summary

Budding yeast cells use the spindle position checkpoint (SPOC) to ensure accurate chromosome segregation. This study reveals Kin4 kinase balances mitotic exit signals, clarifying SPOC molecular mechanisms.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Faithful chromosome segregation during mitosis relies on precise spatiotemporal control of mitotic exit.
  • The spindle position checkpoint (SPOC) in budding yeast prevents mitotic exit when the anaphase spindle is mispositioned, but its molecular mechanisms are not fully understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which the SPOC regulates mitotic exit in budding yeast.
  • To investigate the interplay between the SPOC, the mitotic exit network (MEN), and the cdc fourteen early anaphase release (FEAR) network.

Main Methods:

  • Genetic analysis of budding yeast mutants.
  • Biochemical assays to study protein interactions and signaling pathways.
  • Microscopy to observe cell division and chromosome segregation.

Main Results:

  • The central SPOC kinase, Kin4, counterbalances MEN activation by the FEAR network in the mother cell.
  • Kin4 is dispensable for SPOC function when FEAR is absent.
  • FEAR regulates the SPOC component Bfa1 and MEN kinase Cdc15, contributing to mitotic exit.
  • Specific controls promote mitotic exit in the daughter cell compartment.

Conclusions:

  • Kin4 plays a critical role in balancing mitotic exit signals, mediated by its interaction with the FEAR network.
  • FEAR network activity is essential for SPOC function and contributes to mitotic exit regulation.
  • Distinct regulatory mechanisms govern mitotic exit in mother and daughter cell compartments, ensuring accurate cell division.