Required for normal structure and function of sensory cilia on amphid neurons, especially for the formation of distal ciliary structures, but is less important for normal assembly of middle and basal ciliary structures. Plays a role in the organization of axoneme microtubule bundles in sensory cilia. Required for normal structure and function of the ASER neuron that mediates attraction to NaCl. Required for normal chemotaxis to NaCl. Required for normal avoidance response to high osmolarity. In contrast, is not required for normal chemotaxis to isoamyl alcohol. Does not play a role in intraflagella transport (IFT). Promotes dauer formation in response to pheromones such as the ascarosides ascr#2, ascr#3, ascr#5, ascr#8 and icas#9