Acts as a GTPase-activating protein (GAP) for ARL2 with low specific activity. Also present in the cuticular plate of auditory hair cells. Expressed along the length of the stereocilia, but excluded from the very tip (By similarity). Colocalizes with F-actin cytoskeleton. Both isoform 1 and isoform 6 are widely expressed. The disease is caused by variants affecting the gene represented in this entry. The disease is caused by variants affecting the gene represented in this entry.