SAS-1 and SSNA-1 form dynamic centriolar satellites in C. elegans
Tiryakiler, A. B.; Talib, S. Z. A.; Soares, A. F. H.; Heim, A.; Zanin, E.; Mikeladze-Dvali, T.
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Centriolar satellites are dynamic pericentrosomal structures implicated in centrosomal protein homeostasis and ciliogenesis. Centriolar satellites have been identified in vertebrates and were only recently described in flies. In C. elegans similar pericentriolar structures were reported for the Sjogrens Syndrome Nuclear Antigen 1 (SSNA-1). However, whether these foci have characteristics resembling centriolar satellites of vertebrates, has not been explored. We show that Spindle Assembly-1 (SAS-1), the interaction partner of SSNA-1 forms similar satellite-like structures that localize to a pericentrosomal space in a cell cycle-dependent manner. SAS-1 satellite-like structures associate with and are dependent on the microtubule cytoskeleton. Furthermore, we demonstrate that they form in a dose dependent manner, are dynamic and sensitive to agents disrupting weak hydrophobic interactions, characteristics of biomolecular condensates. We conclude that C. elegans has bona fide centriolar satellites highlighting their evolutionary conservation and importance across species, and at the same time opening new avenues for future mechanistic studies.
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