Omenn syndrome is a rare autosomal recessive disease that is characterized by severe combined immunodeficiency (SCID) associated with erythrodermia, hepatosplenomegaly, lymphadenopathy, and alopecia. Mutations in the recombination activating genes 1 and 2 (RAG1/2) have been described in the majority of patients with this disease. Omenn syndrome caused by ARTEMIS (DCLRE1C) mutations has also been reported.
