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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...

Meiosis vs. Mitosis

Meiosis vs. Mitosis

Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...

Meiosis II

Meiosis II

Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...

The Mitotic Spindle

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: May 29, 2026

Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes

Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes

Published on: September 13, 2022

Evaluating spindle assembly checkpoint competence in mouse oocytes using immunoblotting.

¹Mammalian Oocyte and Embryo Research Laboratory, Division of Biosciences and Institute for Women's Health, University College London, London, UK. h.homer@ucl.ac.uk

Methods in Molecular Biology (Clifton, N.J.)

|August 27, 2011

Summary

The spindle assembly checkpoint (SAC) ensures accurate chromosome segregation during meiosis I. This study details an immunoblotting method to assess SAC function in mouse oocytes, crucial for preventing aneuploidy.

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Last Updated: May 29, 2026

Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes

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Published on: September 13, 2022

Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing

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Using Mouse Oocytes to Assess Human Gene Function During Meiosis I

Using Mouse Oocytes to Assess Human Gene Function During Meiosis I

Published on: April 10, 2018

Area of Science:

Cell Biology
Genetics
Developmental Biology

Background:

The spindle assembly checkpoint (SAC) is a critical cell cycle regulator ensuring accurate chromosome segregation.
SAC activity modulates the anaphase-promoting complex/cyclosome (APC/C) to control anaphase onset.
Errors in meiosis I chromosome segregation in human oocytes lead to aneuploidy and birth defects.

Purpose of the Study:

To describe a novel immunoblotting technique for evaluating spindle assembly checkpoint (SAC) competence.
To assess SAC function during meiosis I in mouse oocytes.

Main Methods:

Immunoblotting technique applied to mouse oocytes.
Analysis of SAC competence during meiosis I.

Main Results:

The study presents a method for evaluating SAC competence in mouse oocytes.
This technique is vital for understanding chromosome segregation accuracy.

Conclusions:

The spindle assembly checkpoint (SAC) is essential for accurate chromosome segregation in meiosis I.
The described immunoblotting method provides a tool to evaluate SAC competence in mouse oocytes, aiding research into aneuploidy causes.