Non-Syndromic X-Linked Intellectual Disability 9, also known as x-linked mental retardation 44, is related to intellectual developmental disorder, x-linked 9 and intellectual developmental disorder, x-linked 29. An important gene associated with Non-Syndromic X-Linked Intellectual Disability 9 is FTSJ1 (FtsJ RNA 2'-O-Methyltransferase 1).