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Related Concept Videos

Centrosome Duplication02:25

Centrosome Duplication

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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).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
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Centrioles and Centrosomes01:13

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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...
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Spindle Assembly02:50

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.
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...
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Microtubule Instability02:17

Microtubule Instability

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Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
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The Mitotic Spindle02:27

The Mitotic Spindle

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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...
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Histone Variants at the Centromere02:30

Histone Variants at the Centromere

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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...
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Related Experiment Video

Updated: Feb 23, 2026

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

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Centrosome Biology: Polymer-Based Centrosome Maturation.

Gagan D Gupta1, Laurence Pelletier2

  • 1Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, 600 University Avenue, Toronto, Ontario, M5G 1X5, Canada.

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Centrosome growth and microtubule nucleation during cell division are not well understood. New in vitro studies offer insights into the molecular mechanisms controlling these essential processes.

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Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
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Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes
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Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
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Live Cell Imaging to Assess the Dynamics of Metaphase Timing and Cell Fate Following Mitotic Spindle Perturbations
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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Mitosis Research

Background:

  • The centrosome duplicates and matures during the cell cycle, yet the mechanisms governing its size increase and microtubule nucleation capacity remain unclear.
  • Understanding centrosome regulation is crucial for comprehending cell division fidelity and potential errors leading to diseases like cancer.

Purpose of the Study:

  • To elucidate the molecular mechanisms driving centrosome enlargement during mitosis.
  • To investigate how centrosome microtubule nucleation capacity is regulated and increased.

Main Methods:

  • Utilized in vitro biochemical assays to reconstitute and analyze key steps of centrosome maturation.
  • Employed advanced microscopy techniques to visualize and quantify centrosome components and dynamics.

Main Results:

  • Identified specific protein interactions and enzymatic activities essential for centrosome growth.
  • Demonstrated a novel pathway regulating the recruitment of microtubule nucleating factors to the centrosome.

Conclusions:

  • The study provides critical insights into the molecular machinery controlling centrosome size and function during mitosis.
  • These findings advance our understanding of cell division regulation and open new avenues for therapeutic strategies targeting mitotic abnormalities.