Involved in negative regulation of guanylate cyclase activity and visual perception. Acts upstream of or within retina development in camera-type eye. Located in nucleus; photoreceptor inner segment; and photoreceptor outer segment. Is expressed in brain and sensory organ. Used to study Leber congenital amaurosis 12. Human ortholog(s) of this gene implicated in Leber congenital amaurosis; Leber congenital amaurosis 12; and retinal degeneration. Orthologous to human RD3 (RD3 regulator of GUCY2D). [provided by Alliance of Genome Resources, Apr 2022]