LRAT (Lecithin Retinol Acyltransferase): LRAT is an enzyme that plays a crucial role in vitamin A metabolism by catalyzing the conversion of all-trans-retinol into all-trans-retinyl esters, the storage form of vitamin A. This process is vital for vision, immune function, and cellular differentiation. Deficiencies or mutations in LRAT can lead to retinal disorders and weakened immune responses, underscoring its importance in maintaining vitamin A balance and overall health.