Intellectual Developmental Disorder, X-Linked, Syndromic, Lujan-Fryns Type, also known as lujan-fryns syndrome, is related to lujan syndrome and syndromic x-linked intellectual disability 14. An important gene associated with Intellectual Developmental Disorder, X-Linked, Syndromic, Lujan-Fryns Type is MED12 (Mediator Complex Subunit 12). Affiliated tissues include heart and brain, and related phenotypes are macrocephaly and intellectual disability