Plays a role in rod outer segment (ROS) morphogenesis (By similarity). May play a role with PRPH2 in the maintenance of the structure of ROS curved disks (By similarity). Plays a role in the organization of the ROS and maintenance of ROS disk diameter (By similarity). Involved in the maintenance of the retina outer nuclear layer (By similarity). Homodimer; disulfide-linked (PubMed:1610568). Forms a homotetramer (By similarity). Forms a heterotetramer with PRPH2 (By similarity). Homotetramer and heterotetramer core complexes go on to form higher order complexes by formation of intermolecular disulfide bonds (By similarity). Interacts with STX3 (By similarity). Interacts with SNAP25 (By similarity). Retina photoreceptors (at protein level) (PubMed:1610568, PubMed:8504299). In rim region of ROS disks (PubMed:1610568). The disease may be caused by variants affecting distinct genetic loci, including the gene represented in this entry. A digenic form of retinitis pigmentosa 7 results from a mutation in the PRPH2 gene and a null mutation of the ROM1 gene has been reported (PubMed:8202715). Belongs to the PRPH2/ROM1 family. Retina International's Scientific Newsletter