C. elegans SAS-1 ensures centriole integrity and ciliary function, and operates with SSNA-1

Area of Science:

• Cell Biology
• Molecular Biology
• Genetics

Background:

• Centrioles are essential microtubule-based organelles involved in cell signaling, motility, and division.
• The SAS-1 protein in C. elegans is homologous to human C2CD3 and is implicated in centriole integrity, but its precise function is unclear.

Purpose of the Study:

• To elucidate the role of SAS-1 in centriole assembly, integrity, and function.
• To investigate the relationship between SAS-1 and SSNA-1 in centriole biogenesis and ciliary function.

Main Methods:

• Generation and analysis of a SAS-1 null allele in C. elegans.
• Ultra-Expressed Super-Resolution STED microscopy.
• Molecular epistasis experiments and heterologous human cell assays.

Main Results:

• SAS-1 is not required for centriole assembly initiation but is essential for maintaining centriole integrity throughout development.
• SAS-1 localizes to the centriole transition zone and partially contributes to ciliary function.
• SAS-1 is required for the localization of SSNA-1 to centrioles and the transition zone, and recruits SSNA-1 to microtubules.

Conclusions:

• SAS-1, in conjunction with SSNA-1, plays a vital role in ensuring centriole integrity.
• SAS-1 contributes to cilium function, highlighting its importance in microtubule-based organelles.