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Centrioles and Centrosomes01:13

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 Duplication02:25

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 Duplication02:25

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...
Spindle Assembly02:50

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 Spindle02:27

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 Spindle02:27

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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Related Experiment Video

Updated: Jun 8, 2026

Isolation and Fluorescence Imaging for Single-particle Reconstruction of Chlamydomonas Centrioles
10:38

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

Published on: September 21, 2018

Building the centriole.

Juliette Azimzadeh1, Wallace F Marshall

  • 1Department of Biochemistry and Biophysics, University of California, San Francisco, 94143, USA.

Current Biology : CB
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Centrioles, essential microtubule organelles, are key to cell structure and function. Recent research is beginning to reveal how their complex ninefold symmetry and precise length are established during assembly.

More Related Videos

Imaging Centrosomes in Fly Testes
09:41

Imaging Centrosomes in Fly Testes

Published on: September 20, 2013

Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes
09:39

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

Published on: December 20, 2014

Related Experiment Videos

Last Updated: Jun 8, 2026

Isolation and Fluorescence Imaging for Single-particle Reconstruction of Chlamydomonas Centrioles
10:38

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

Published on: September 21, 2018

Imaging Centrosomes in Fly Testes
09:41

Imaging Centrosomes in Fly Testes

Published on: September 20, 2013

Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes
09:39

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

Published on: December 20, 2014

Area of Science:

  • Cell Biology
  • Structural Biology
  • Molecular Biology

Background:

  • Centrioles are fundamental microtubule-based organelles central to the animal centrosome.
  • They are essential for nucleating cilia and flagella formation in eukaryotes.
  • Centrioles possess a complex ultrastructure characterized by ninefold symmetry and a defined length.

Purpose of the Study:

  • To explore the assembly mechanisms of centrioles.
  • To understand how ninefold symmetry is established.
  • To elucidate the regulation of centriole length control.

Main Methods:

  • The abstract does not specify methods.
  • Further research is needed to detail the experimental approaches.

Main Results:

  • The abstract does not specify results.
  • Understanding of centriole assembly mechanisms is emerging.

Conclusions:

  • Centriole assembly mechanisms, particularly symmetry and length control, are complex.
  • Ongoing research is beginning to uncover these fundamental biological processes.