Centlein mediates an interaction between C-Nap1 and Cep68 to maintain centrosome cohesion

Area of Science:

• Cell Biology
• Molecular Biology
• Cytoskeleton Dynamics

Background:

• Centrosome cohesion ensures the two parental centrioles function as a single microtubule-organizing center during interphase.
• Loss of centrosome cohesion results in centrosome splitting, a phenomenon linked to various diseases.
• The molecular composition and regulatory mechanisms of centrosome cohesion remain incompletely understood.

Purpose of the Study:

• To elucidate the molecular players and mechanisms underlying centrosome cohesion.
• To identify novel proteins involved in linking parental centrioles within the interphase centrosome.

Main Methods:

• Immunofluorescence microscopy to determine protein localization.
• Co-immunoprecipitation assays to investigate protein-protein interactions.
• siRNA-mediated depletion to assess protein function in vivo.

Main Results:

• Centriolar protein centlein (CNTLN) localizes to proximal centriole ends and interacts with C-Nap1 (Cep250) and Cep68.
• Centlein forms a complex with C-Nap1 and Cep68 at the proximal centriole ends.
• Depletion of centlein disrupts Cep68 recruitment and leads to centrosome splitting.
• Centlein and Cep68 are identified as substrates of Nek2A kinase.

Conclusions:

• Centrosome cohesion is maintained by a novel C-Nap1-centlein-Cep68 complex located at the proximal ends of centrioles.
• This complex acts as a crucial molecular linker, ensuring centrosome integrity.
• The findings reveal a new regulatory pathway involving centlein, Cep68, and Nek2A in maintaining centrosome cohesion.