The deficiency of ornithine aminotransferase (OAT) cause gyrate atrophy, a progressive chorioretinal degeneration disease culminating in blindness. This project investigates age- and tissue-specific proteomic changes in the retina, retinal pigment epithelium (RPE), and liver of OAT-deficient mice to uncover the role of the enzyme in these tissues and the mechanisms underlying the eye damage.