The missense mutations [G38D] ([G42R] in GNAO1), [I52N] ([I56T] in GNAO1), as well as the variant [K273del] ([K278del] in GNAO1) in GNAT1 encoding transducin (Gαt), a retina-specific member of the Gαi/o subfamily, lead to “Congenital Stationary Night Blindness Autosomal Dominant-3” (CSNBAD3; OMIM #610444) (Dryja et al, 1996). The gene discussed is GNAO1; the disease is congenital stationary night blindness.