Focal adhesion-related non-ciliary functions of CEP290

Area of Science:

• Cell Biology
• Molecular Biology
• Genetics

Background:

• Primary cilia are present in most mammalian cells, and their dysfunction causes human ciliopathies.
• Centrosomal protein 290 (CEP290) is a ciliary protein linked to ciliopathies, typically associated with its function within cilia.
• CEP290 is also found in non-ciliated cells, suggesting potential roles beyond ciliary function.

Purpose of the Study:

• To investigate the cilia-independent functions of CEP290 in non-ciliated cells.
• To elucidate the molecular mechanisms underlying CEP290-related ciliopathies, considering non-ciliary roles.

Main Methods:

• Studied Cep290 knockout cells to assess cilia-independent functions.
• Investigated CEP290's interaction with adenomatous polyposis coli (APC) and its role in microtubule organization.
• Analyzed focal adhesion formation and cell migration in Cep290-deficient cells.

Main Results:

• Loss of Cep290 function impairs microtubule elongation by affecting the microtubule organizing center.
• CEP290 forms a complex with APC, crucial for stabilizing paxillin at the leading edge in non-ciliated cells.
• Cep290 knockout cells exhibit impaired collective cell migration, altered morphology, and reduced adhesion due to reduced focal adhesion formation.

Conclusions:

• CEP290 possesses critical cilia-independent functions impacting microtubule organization and cell adhesion.
• The APC-CEP290 complex is vital for focal adhesion stability and cell migration in non-ciliated cells.
• These findings expand the understanding of ciliopathies by highlighting the significance of CEP290's non-ciliary roles.