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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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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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A network-based approach to dissect the cilia/centrosome complex interactome.

Roberto Amato, Manuela Morleo, Laura Giaquinto

  • 1Telethon Institute of Genetics and Medicine (TIGEM), Naples, Italy. franco@tigem.it.

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We developed a tool to map protein interactions within cilia, revealing new functions like mRNA processing and protein folding. This helps understand ciliopathies and develop new clinical applications.

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Area of Science:

  • Cell Biology
  • Systems Biology
  • Genetics

Background:

  • Cilia are vital microtubule-based organelles in mammalian cells.
  • Dysfunctional cilia cause genetic disorders known as ciliopathies.
  • The complete protein composition and function of cilia remain incompletely understood.

Purpose of the Study:

  • To develop a tool for dissecting the cilia/centrosome complex interactome (CCCI).
  • To provide an interaction-based perspective on ciliary function.
  • To identify novel biological roles of ciliary proteins.

Main Methods:

  • Systematic network-based approach.
  • Integration of existing data into a comprehensive model.
  • Analysis of protein interaction networks, gene co-expression, and sequence data.
  • Identification of transcription factors regulating gene communities.

Main Results:

  • A network of human protein interactions within the cilia/centrosome complex was generated.
  • Proteins were organized into functionally relevant communities based on inter-connectivity and co-expression.
  • Novel ciliary functions, including mRNA processing, protein translation, folding, and degradation, were discovered.
  • Transcription factors regulating these ciliary gene communities were identified.

Conclusions:

  • The CCCI tool aids in clarifying unknown ciliary functions.
  • It facilitates elucidation of molecular mechanisms underlying ciliary-associated phenotypes.
  • This knowledge can be applied to disease phenotypes and clinical applications for ciliopathies.