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The Spindle Assembly Checkpoint

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 Checkpoint

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...

Cohesins

Cohesins

Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...

Cohesins

Cohesins

Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...

Forces Acting on Chromosomes

Forces Acting on Chromosomes

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.
Microtubules and motor proteins exert two types of forces on...

Forces Acting on Chromosomes

Forces Acting on Chromosomes

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.
Microtubules and motor proteins exert two types of forces on...

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Related Experiment Video

Updated: Jun 21, 2026

Using Fluorescence In Situ Hybridization (FISH) to Monitor the State of Arm Cohesion in Prometaphase and Metaphase I Drosophila Oocytes

Using Fluorescence In Situ Hybridization (FISH) to Monitor the State of Arm Cohesion in Prometaphase and Metaphase I Drosophila Oocytes

Published on: December 6, 2017

Chromosome cohesion and the spindle checkpoint.

Laura A Díaz-Martínez¹, Duncan J Clarke

¹UT-Southwestern Medical Center, Department of Pharmacology, Dallas, TX 75390, USA. Laura.Diaz-Martinez@utsouthwestern.edu

Cell Cycle (Georgetown, Tex.)

|August 5, 2009

Summary

Accurate chromosome segregation ensures correct inheritance. This review covers recent advances in understanding sister chromatid cohesion and the spindle checkpoint, crucial for preventing aneuploidy in mitosis and cancer.

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Last Updated: Jun 21, 2026

Using Fluorescence In Situ Hybridization (FISH) to Monitor the State of Arm Cohesion in Prometaphase and Metaphase I Drosophila Oocytes

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Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes

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Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis

Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis

Published on: December 5, 2017

Area of Science:

Cell Biology
Genetics
Molecular Biology

Background:

Accurate chromosome segregation is fundamental for inheritance.
Errors in segregation during mitosis result in aneuploidy, a hallmark of cancer.
Complex cellular mechanisms ensure precise chromosome distribution to daughter cells.

Purpose of the Study:

To review recent advancements in understanding chromosome segregation.
To focus on the roles of sister chromatid cohesion and the spindle checkpoint.
To highlight their importance in maintaining genomic stability.

Main Methods:

Literature review of recent developments in chromosome segregation research.
Focus on molecular mechanisms of sister chromatid cohesion.
Analysis of the spindle assembly checkpoint's regulatory functions.

Main Results:

Recent studies have elucidated the intricate processes governing chromosome segregation accuracy.
Key insights into the regulation of sister chromatid cohesion have emerged.
The spindle checkpoint's role in preventing premature anaphase onset is better understood.

Conclusions:

Understanding chromosome segregation is vital for comprehending inheritance and cancer development.
Sister chromatid cohesion and the spindle checkpoint are critical regulators of mitotic accuracy.
Further research in these areas holds promise for therapeutic strategies against aneuploidy-associated diseases.