LRATD1 (Lecithin Retinol Acyltransferase Domain Containing 1): LRATD1 is a gene that encodes a protein containing a domain similar to lecithin retinol acyltransferase (LRAT), an enzyme involved in vitamin A metabolism. Although its precise functions are still being studied, LRATD1 is believed to play a role in processes related to the utilisation and regulation of vitamin A.