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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,"...

Determining the Plane of Cell Division

Determining the Plane of Cell Division

Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function.
Animal cells
In animal cells, the cleavage furrow forms along the plane of cell division starting...

Determining the Plane of Cell Division

Determining the Plane of Cell Division

Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function.
Animal cells
In animal cells, the cleavage furrow forms along the plane of cell division starting...

Spindle Assembly

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...

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Related Experiment Video

Updated: Jun 28, 2026

Live-Cell Imaging of Drosophila melanogaster Third Instar Larval Brains

Live-Cell Imaging of Drosophila melanogaster Third Instar Larval Brains

Published on: June 23, 2023

Centrosome function during stem cell division: the devil is in the details.

Cayetano Gonzalez¹

¹Cell Division Group, Institute for Research in Biomedicine (IRB-Barcelona), PCB, c/ Josep Samitier 1-5, Barcelona, Spain. gonzalez@irbbarcelona.org

Current Opinion in Cell Biology

|November 11, 2008

Summary

This summary is machine-generated.

Centrosomes organize microtubules, crucial for animal cell polarity and development. This study investigates if animal development is possible without these essential structures, challenging previous assumptions.

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Live-Cell Imaging of Drosophila melanogaster Third Instar Larval Brains

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Published on: September 20, 2013

Area of Science:

Cell Biology
Developmental Biology
Microtubule Dynamics

Background:

Cell polarity is fundamental for animal development.
Microtubules are essential for establishing cell polarity.
Centrosomes typically organize microtubules in somatic and male germ-line animal cells.

Purpose of the Study:

To investigate the role of centrosomes in animal development.
To determine if animal development can occur in the absence of centrosomes.
To challenge the notion that centrosomes are indispensable for animal development.

Main Methods:

Utilizing genetic models (flies) lacking centrosomes.
Observing cell polarity establishment and maintenance.
Analyzing microtubule organization and function.

Main Results:

Demonstrated that animal development can proceed without centrosomes.
Revealed alternative mechanisms for microtubule organization in centrosome-absent cells.
Highlighted the plasticity of cellular organization during development.

Conclusions:

Centrosomes are not strictly required for all aspects of animal development.
Alternative pathways for microtubule organization exist.
This finding expands our understanding of cell polarity and developmental plasticity.