Intellectual Developmental Disorder, X-Linked 9, also known as xlid9, is related to non-syndromic x-linked intellectual disability 9 and intellectual developmental disorder, x-linked 29. An important gene associated with Intellectual Developmental Disorder, X-Linked 9 is FTSJ1 (FtsJ RNA 2'-O-Methyltransferase 1). Affiliated tissues include brain, and related phenotypes are seizure and intellectual disability