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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...

Spindle Assembly

Spindle Assembly

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 microtubule array...

Spindle Assembly

Spindle Assembly

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 microtubule array...

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...

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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Manipulation and Analysis of Cell Cycle-Dependent Processes in Budding Yeast

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Published on: September 26, 2025

[Research progress on spindle assembly checkpoint gene BubR1].

Zhao-jun Chen¹, Feng Li, Jun Yang

¹Zhejiang University School of Public Health, Hangzhou 310058, China.

Zhejiang Da Xue Xue Bao. Yi Xue Ban = Journal of Zhejiang University. Medical Sciences

|August 17, 2011

Summary

This summary is machine-generated.

BubR1 protein is crucial for accurate chromosome segregation during cell division by regulating the spindle assembly checkpoint. Its deficiency leads to aneuploidy and impacts meiosis, DNA damage response, cancer, and aging.

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

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Area of Science:

Cell Biology
Genetics
Molecular Biology

Background:

BubR1 is a conserved gene, homologous to yeast Mad3, vital for the spindle assembly checkpoint.
BubR1 protein is essential for monitoring kinetochore-microtubule attachments and tension during cell division.

Purpose of the Study:

To review the current understanding of BubR1 protein functions.
To highlight the critical role of BubR1 in maintaining genomic stability.

Main Methods:

Literature review of studies on BubR1.
Analysis of BubR1's role in cell division and other biological processes.

Main Results:

BubR1 level directly influences spindle assembly checkpoint function in a dose-dependent manner.
BubR1 deficiency results in compromised spindle assembly checkpoint and progressive aneuploidy.
BubR1 is implicated in meiosis, DNA damage response, cancer, infertility, and aging.

Conclusions:

BubR1 is a key regulator of accurate chromosome segregation and genomic stability.
Dysregulation of BubR1 has broad implications across multiple biological processes and disease states.