Enables intraciliary transport particle A binding activity. Acts upstream of or within acrosome reaction and spermatogenesis. Located in 9+0 non-motile cilium and cytosol. Is expressed in neural retinal epithelium; retina; retina inner nuclear layer; retina nuclear layer; and retina outer nuclear layer. Orthologous to human IFTAP (intraflagellar transport associated protein). [provided by Alliance of Genome Resources, Apr 2022]