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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...

Separation of Sister Chromatids

Separation of Sister Chromatids

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.
At the onset of anaphase, separase, a proteolytic enzyme, is...

Separation of Sister Chromatids

Separation of Sister Chromatids

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.
At the onset of anaphase, separase, a proteolytic enzyme, is...

The Cell Cycle Control System

The Cell Cycle Control System

The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...

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The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...

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

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Published on: September 26, 2025

Safeguarding entry into mitosis: the antephase checkpoint.

Cheen Fei Chin¹, Foong May Yeong

¹Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore S117597, Singapore.

Molecular and Cellular Biology

|October 21, 2009

Summary

The antephase checkpoint prevents cells from entering mitosis under stress. This review explores its pathway, unresolved questions, and future research directions for maintaining genomic stability.

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Area of Science:

Cell Biology
Genomics
Molecular Biology

Background:

Genomic stability is crucial for cell survival and accurate chromosome inheritance.
Cell cycle checkpoints, like DNA damage and spindle assembly checkpoints, ensure proper cell division.
The antephase checkpoint is a recently recognized checkpoint preventing mitosis entry upon cellular stress.

Purpose of the Study:

To review the current understanding of the antephase checkpoint pathway.
To identify unresolved issues in antephase checkpoint research.
To provide perspectives on future research directions for this critical cell cycle regulator.

Main Methods:

Literature review of existing studies on the antephase checkpoint.
Analysis of molecular pathways involved in sensing cellular stress before mitosis.
Discussion of experimental evidence and theoretical models.

Main Results:

The antephase checkpoint monitors cellular status before mitosis entry.
It responds to various stress agents that threaten chromosome inheritance.
Key components and regulatory mechanisms of the pathway are being elucidated.

Conclusions:

The antephase checkpoint plays a vital role in preventing genomic instability.
Further research is needed to fully understand its mechanisms and regulation.
Elucidating the antephase checkpoint offers insights into cell cycle control and disease prevention.