Intellectual Developmental Disorder, X-Linked 109, also known as mental retardation, x-linked, fraxe type, is related to fraxe intellectual disability and fragile x-associated tremor/ataxia syndrome, and has symptoms including agitation An important gene associated with Intellectual Developmental Disorder, X-Linked 109 is AFF2 (ALF Transcription Elongation Factor 2). Affiliated tissues include cerebellum and brain, and related phenotypes are intellectual disability and delayed speech and language development