RMRP and 22q11.2 deletion syndrome: AT, ADA-SCID and CID (predominant). Also observed in CVID, X-SCID, RAG1/2 deficiency, NBS, XLA, DiGeorge Syndrome, CHH, Artemis deficiency, MHC II deficiency, Marden-Walker syndrome, McKusic syndrome, TAP1 deficiency, WHIM syndrome, Coronin 1A deficiency.