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Updated: Aug 23, 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

Published on: December 20, 2014

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TTBK2 controls cilium stability by regulating distinct modules of centrosomal proteins

Abraham Nguyen1,2, Sarah C Goetz2

  • 1Molecular Cancer Biology Program, Duke University School of Medicine, Durham, NC 27710.

Molecular Biology of the Cell
|November 2, 2022
PubMed

Insights

Tau tubulin kinase 2 (TTBK2) is crucial for primary cilia stability. Its depletion destabilizes the ciliary axoneme and leads to cilia loss, revealing TTBK2

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Signaling Pathways

Background:

  • Primary cilia are essential signaling organelles regulated by the serine-threonine kinase TTBK2.
  • The precise mechanisms by which TTBK2 maintains cilium stability are not fully understood.

Purpose of the Study:

  • To investigate the role of TTBK2 in maintaining the stability of assembled primary cilia.
  • To elucidate the molecular mechanisms underlying TTBK2-mediated cilium stability.

Main Methods:

  • Utilized mouse embryonic fibroblasts from TTBK2-deficient embryos to study cilium stability post-formation.
  • Assessed molecular changes in assembled cilia over time after TTBK2 depletion.
  • Investigated the impact of actin-trafficking inhibitors on cilia loss.

Main Results:

  • TTBK2 deletion leads to ciliary axoneme destabilization and primary cilia loss within 48-72 hours.
  • Axoneme destabilization is characterized by increased cilia breaks and reduced microtubule modifications.
  • TTBK2 is essential for regulating centriolar satellite composition and maintaining basal body intraflagellar transport protein pools.

Conclusions:

  • TTBK2 plays a critical role in maintaining primary cilia stability through multiple pathways.
  • TTBK2 regulates axoneme stability and the composition of key protein complexes at the basal body.

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