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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.
Near the end of the prophase, also called late prophase or "prometaphase,"...

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...

Histone Variants at the Centromere

Histone Variants at the Centromere

Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3 variants are also...

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.
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Related Experiment Video

Updated: May 25, 2026

Imaging Centrosomes in Fly Testes

Imaging Centrosomes in Fly Testes

Published on: September 20, 2013

The centrosome in cells and organisms.

Michel Bornens¹

¹UMR144 du Centre Nationale de la Recherche Scientifique, Institut Curie, 26 rue d'Ulm, Paris Cedex 05, France. mbornens@curie.fr

Science (New York, N.Y.)

|January 28, 2012

Summary

The centrosome, crucial for cell division and polarity, is not universally present in all organisms. Its role in positioning the nucleus and defining embryo polarity highlights its evolutionary significance.

Area of Science:

Cell Biology
Evolutionary Biology
Genetics

Background:

The centrosome is the primary microtubule-nucleating organelle in animal cells.
It is essential for mitotic spindle orientation and maintaining genome stability.
Centrosomes are absent in some multicellular organisms and specific cell types.

Purpose of the Study:

To discuss the centrosome's role in establishing cell polarity.
To explore how centrosome function influences nuclear positioning.
To examine the potential impact of centrosome innovation on metazoan evolution.

Main Methods:

Review of existing literature on centrosome function.
Analysis of centrosome's role in cell division and polarity.
Comparative evolutionary analysis of centrosome presence and function.

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Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes

Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes

Published on: December 20, 2014

Isolation and Fluorescence Imaging for Single-particle Reconstruction of Chlamydomonas Centrioles

Isolation and Fluorescence Imaging for Single-particle Reconstruction of Chlamydomonas Centrioles

Published on: September 21, 2018

Related Experiment Videos

Last Updated: May 25, 2026

Imaging Centrosomes in Fly Testes

Imaging Centrosomes in Fly Testes

Published on: September 20, 2013

Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes

Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes

Published on: December 20, 2014

Isolation and Fluorescence Imaging for Single-particle Reconstruction of Chlamydomonas Centrioles

Isolation and Fluorescence Imaging for Single-particle Reconstruction of Chlamydomonas Centrioles

Published on: September 21, 2018

Main Results:

Centrosome reproduction transmits polarity to daughter cells.
The sperm-donated centrosome typically establishes embryo polarity.
Centrosomes are key to positioning the nucleus centrally within the cell.

Conclusions:

The centrosome is vital for cell polarity and nuclear organization.
Centrosome innovation may have been a critical factor in the evolution of metazoans.