GNAT1 and congenital stationary night blindness: In rods, the α-subunit of the heterotrimeric G protein transducin is encoded by GNAT1 (Lerman and Minna, 2000), and patients with missense mutations in GNAT1 exhibit congenital stationary night blindness (CSNB) (Dryja et al., 1996; Naeem et al., 2012).