Predicted to enable phosphatidylinositol-3,4,5-trisphosphate binding activity and phosphatidylinositol-3,4-bisphosphate binding activity. Involved in multi-organism membrane organization and positive regulation of actin filament polymerization. Located in stereocilium shaft. Is expressed in tail dorsal root ganglion and trigeminal ganglion. Orthologous to human FCHSD2 (FCH and double SH3 domains 2). [provided by Alliance of Genome Resources, Apr 2022]