LRAT (lecithin retinol acyltransferase) catalyzes the transfer of acyl groups from phosphatidylcholine to all-trans retinol, generating all-trans retinyl esters that serve as vitamin A storage forms 1. These retinyl esters are subsequently processed into 11-cis-retinaldehyde, the chr4 essential for rhodopsin and cone photopigments, making LRAT critical for visual function. The enzyme is required for cone photoreceptor survival and proper rod morphology. Beyond vision, LRAT serves as a selective marker for quiescent hepatic stellate cells (HSCs) and is used experimentally via Lrat-Cre transgenic mice to study HSC-specific gene function 2345. During liver fibrosis, HSCs undergo vitamin A depletion and myofibroblast activation, with LRAT+ cells exhibiting differential responses depending on fibrotic context 3. The Lrat promoter enables precise genetic manipulation of HSCs to investigate their role in fibrosis pathogenesis and potential therapeutic targets 678. Mutations in LRAT cause Leber congenital amaurosis 14, a severe inherited retinal dystrophy. Thus, LRAT has dual significance: primary function in retinoid metabolism supporting vision, and utility as a lineage-specific tool for studying HSC biology in liver disease.