X-Linked Intellectual Disability, Siderius Type, also known as x-linked mental retardation hamel type, is related to syndromic x-linked intellectual disability siderius type and intellectual developmental disorder, x-linked, syndromic, siderius type. An important gene associated with X-Linked Intellectual Disability, Siderius Type is PHF8 (PHD Finger Protein 8). Affiliated tissues include bone, and related phenotypes are intellectual disability, mild and cleft upper lip