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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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The primary cilium, made up of microtubules, acts as antennae on the cell surfaces for relaying external stimuli into the cells. These fine hair-like structures are present, generally one per cell. These are non-motile cilia in a 9+0 microtubules arrangement, where the central pair of microtubules are absent. The primary cilia arise from the basal body embedded in the cell membrane. Intraflagellar transport (IFT) carries requisite proteins from the cytoplasm to the cilium because the primary...
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Related Experiment Video

Updated: Apr 28, 2026

Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes
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Multicilin drives centriole biogenesis via E2f proteins.

Lina Ma1, Ian Quigley1, Heymut Omran2

  • 1The Salk Institute for Biological Studies, La Jolla 92037, California, USA;

Genes & Development
|June 18, 2014
PubMed
Summary

Multicilin protein drives massive centriole assembly in multiciliate cells by forming a complex that activates centriole biogenesis genes. Mutations in Multicilin cause mucociliary clearance disorders due to impaired cilia generation.

Keywords:
centriolese2f4multiciliate cells

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Genetics

Background:

  • Multiciliate cells require hundreds of centrioles for motile cilia function.
  • Centriole duplication typically occurs during the cell cycle, but multiciliate cells assemble centrioles in G0.
  • Multicilin is a key protein initiating massive centriole assembly in differentiating multiciliate cells.

Purpose of the Study:

  • To elucidate the molecular mechanism by which Multicilin drives centriole biogenesis in multiciliate cells.
  • To investigate the role of the Multicilin complex in regulating gene expression for centriole assembly.
  • To understand the impact of Multicilin mutations on human health, specifically mucociliary clearance disorders.

Main Methods:

  • Biochemical assays to determine protein complex formation (Multicilin, E2f4/E2f5, Dp1).
  • Gene expression analysis (e.g., quantitative PCR) to identify target genes regulated by the Multicilin complex.
  • Analysis of patient-derived mutations in Multicilin and their functional consequences.

Main Results:

  • Multicilin forms a ternary complex with E2f4/E2f5 and Dp1, which activates genes essential for centriole biogenesis.
  • This complex selectively activates genes for centriole assembly while keeping other cell cycle genes inactive.
  • The Multicilin complex promotes the deuterosome pathway by activating deup1 expression.
  • Mutations in human Multicilin impair this complex, leading to reduced cilia generation and congenital mucociliary clearance disorders.

Conclusions:

  • Multicilin utilizes E2f-mediated transcriptional regulation to achieve massive centriole assembly outside of the canonical cell cycle.
  • This mechanism is crucial for multiciliate cell differentiation and proper epithelial function.
  • Dysfunctional Multicilin underlies severe congenital mucociliary clearance disorders, highlighting the importance of centriole biogenesis regulation.