Intellectual Developmental Disorder, X-Linked, Syndromic, Siderius Type, also known as siderius-hamel syndrome, is related to syndromic x-linked intellectual disability siderius type and x-linked intellectual disability, siderius type. An important gene associated with Intellectual Developmental Disorder, X-Linked, Syndromic, Siderius Type is PHF8 (PHD Finger Protein 8). Affiliated tissues include testes and brain, and related phenotypes are intellectual disability and microcephaly