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Related Concept Videos

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...
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...
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,"...

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Related Experiment Video

Updated: May 10, 2026

Basic Caenorhabditis elegans Methods: Synchronization and Observation
11:34

Basic Caenorhabditis elegans Methods: Synchronization and Observation

Published on: June 10, 2012

48.6K

Centriole assembly in Caenorhabditis elegans.

Laurence Pelletier1, Eileen O'Toole, Anne Schwager

  • 1Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, 01307 Dresden, Germany. pelletie@mpi-cbg.de

Nature
|December 1, 2006
PubMed
Summary

Centriole duplication mechanisms are revealed. Daughter centriole assembly starts with a central tube, followed by nine singlet microtubules, guided by specific proteins and upstream signals.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Centrioles are essential for cell division and structure.
  • The precise mechanisms of centriole duplication are not fully understood.

Purpose of the Study:

  • To elucidate the structural pathway of daughter centriole assembly.
  • To identify key proteins and signals involved in centriole formation.

Main Methods:

  • Electron tomography of staged Caenorhabditis elegans one-cell embryos.
  • Analysis of protein dependencies for centriole component assembly.

Main Results:

  • Daughter centriole assembly initiates with central tube formation and elongation.
  • Peripheral assembly of nine singlet microtubules follows tube formation.
  • SAS-5 and SAS-6 proteins are crucial for tube formation; SAS-4 is essential for microtubule assembly.
  • SPD-2 and ZYG-1 mediate upstream signals that trigger centriole assembly.

Conclusions:

  • A detailed structural pathway for daughter centriole assembly has been defined.
  • Identified proteins and signaling pathways provide insights into centriole biogenesis.
  • Findings have broad implications for understanding centriole assembly across organisms.