Intellectual Developmental Disorder, X-Linked 100, also known as mental retardation, x-linked 100, is related to non-syndromic x-linked intellectual disability 100, and has symptoms including seizures An important gene associated with Intellectual Developmental Disorder, X-Linked 100 is KIF4A (Kinesin Family Member 4A). Affiliated tissues include brain, and related phenotypes are intellectual disability and delayed speech and language development