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Centrosome Duplication

Centrosome Duplication

The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...

Centrosome Duplication

Centrosome Duplication

The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...

Centrioles and Centrosomes

Centrioles and Centrosomes

Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
Near the end of the prophase, also called late prophase or "prometaphase,"...

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 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...

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Related Experiment Video

Updated: May 17, 2026

Live Cell Imaging to Assess the Dynamics of Metaphase Timing and Cell Fate Following Mitotic Spindle Perturbations

Live Cell Imaging to Assess the Dynamics of Metaphase Timing and Cell Fate Following Mitotic Spindle Perturbations

Published on: September 20, 2019

Centrosomes, chromosome instability (CIN) and aneuploidy.

Benjamin D Vitre¹, Don W Cleveland

¹Ludwig Institute for Cancer Research and Department of Cellular and Molecular Medicine, University of California, 9500 Gilman Drive, San Diego, La Jolla, CA 92093-0670, USA.

Current Opinion in Cell Biology

|November 7, 2012

Summary

Cell division requires accurate chromosome segregation, which relies on the mitotic spindle. Centrosomes are crucial for spindle formation and function, and their dysfunction can lead to errors in chromosome inheritance.

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Area of Science:

Cell Biology
Genetics
Molecular Biology

Background:

Cell division necessitates precise chromosome segregation into daughter cells.
The mitotic spindle, a microtubule-based structure, orchestrates this segregation.
Centrosomes are vital in animal cells for organizing the mitotic spindle, nucleating microtubules, and ensuring bipolarity.

Purpose of the Study:

To review the critical role of centrosomes in mitotic spindle assembly.
To explore the link between centrosome status and chromosome inheritance fidelity.

Main Methods:

Literature review of recent research on centrosome function in mitosis.
Analysis of studies investigating centrosome biogenesis and its impact on spindle formation.

Main Results:

Centrosome dysfunction, often due to aberrant protein expression, can result in abnormal centrosome numbers.
Improper spindle formation and chromosome missegregation are consequences of centrosome defects.
Centrosome status is intrinsically linked to the mechanisms ensuring accurate chromosome inheritance.

Conclusions:

Centrosomes are indispensable for correct mitotic spindle organization and function.
Maintaining centrosome integrity is essential for preventing chromosome missegregation and ensuring genomic stability.