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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.
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Spindle Assembly

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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.
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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).
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Related Experiment Video

Updated: Jun 29, 2026

Self-Assembly of Microtubule Tactoids

Self-Assembly of Microtubule Tactoids

Published on: June 23, 2022

Centrioles: some self-assembly required.

Mi Hye Song¹, Nicholas B Miliaras, Nina Peel

¹Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA.

Current Opinion in Cell Biology

|October 9, 2008

Summary

This summary is machine-generated.

Centrioles duplicate once per cell cycle, with new centrioles (daughter) usually forming near existing ones (mother). Recent findings reveal a common self-assembly mechanism for both canonical and de novo centriole formation, spatially regulated by mother centrioles.

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Area of Science:

Cell Biology
Microtubule Organization
Centriole Biogenesis

Background:

Centrioles are crucial for microtubule organization and cell division.
Centriole duplication occurs once per cell cycle.
Canonical centriole assembly involves new centrioles forming adjacent to existing ones.

Purpose of the Study:

To investigate the mechanisms of centriole self-assembly.
To determine if canonical and de novo centriole assembly pathways share common mechanisms.
To understand how centriole duplication is regulated to ensure one daughter per mother centriole.

Main Methods:

Analysis of centriole assembly pathways.
Investigating the role of mother centrioles in spatial regulation.
Identifying regulatory mechanisms for canonical assembly.

Main Results:

Canonical and de novo centriole assembly utilize a common self-assembly mechanism.
Mother centrioles spatially constrain de novo assembly to their vicinity.
Additional mechanisms ensure precise regulation of one daughter centriole per cell cycle.

Conclusions:

Centriole self-assembly is a conserved process.
Mother centrioles act as scaffolds and spatial regulators for daughter centriole formation.
Precise control mechanisms guarantee accurate centriole duplication during the cell cycle.