Retinitis Pigmentosa 4, also known as rp4, is related to usher syndrome and retinitis pigmentosa. An important gene associated with Retinitis Pigmentosa 4 is RHO (Rhodopsin), and among its related pathways/superpathways are Visual phototransduction and Visual Cycle in Retinal Rods. Affiliated tissues include retina and eye, and related phenotypes are abnormal electroretinogram and reduced visual acuity