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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).
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Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
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M cyclin...
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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.
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The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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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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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.
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Related Experiment Video

Updated: Nov 11, 2025

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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The RAC1 activator Tiam1 regulates centriole duplication through controlling PLK4 levels.

Andrew P Porter1, Hannah Reed1, Gavin R M White1

  • 1Cell Signalling Group, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park, Macclesfield SK10 4TG, UK.

Journal of Cell Science
|March 24, 2021
PubMed
Summary
This summary is machine-generated.

The Rac1 GEF Tiam1 controls centriole duplication by regulating PLK4 degradation. Tiam1 depletion causes centriole overduplication and aneuploidy, highlighting its role in maintaining genomic stability.

Keywords:
AneuploidyCentrioleCentriole duplicationPLK4Tiam1βTRCP

More Related Videos

Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
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Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis

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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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Related Experiment Videos

Last Updated: Nov 11, 2025

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

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Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
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Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis

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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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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
  • Genetics

Background:

  • Centriole duplication ensures correct centrosome number during the cell cycle.
  • PLK4 is the master regulator of centriole duplication, and its degradation is tightly controlled.

Purpose of the Study:

  • To investigate the role of Tiam1, a Rac1 guanine nucleotide exchange factor (GEF), in centriole duplication and cell cycle regulation.
  • To determine the mechanism by which Tiam1 influences PLK4 levels and centriole number.

Main Methods:

  • Centrosome localization studies of Tiam1.
  • Tiam1 depletion and overexpression experiments.
  • Analysis of PLK4 levels and centriole number.
  • Assessment of chromosome segregation and aneuploidy.

Main Results:

  • Tiam1 localizes to centrosomes during S-phase and is crucial for maintaining normal centriole number.
  • Tiam1 depletion increases centrosomal PLK4, leading to centriole overduplication and aneuploidy.
  • Tiam1 regulates PLK4 degradation via βTRCP, independent of Rac1 activation.

Conclusions:

  • Tiam1 plays a critical role in regulating centriole duplication by controlling PLK4 degradation through the βTRCP pathway.
  • Tiam1-mediated regulation of centriole number is essential for preventing aneuploidy and maintaining genomic stability.