Primary Microcephaly-Epilepsy-Permanent Neonatal Diabetes Syndrome is related to microcephaly and epiphyseal dysplasia, multiple, with early-onset diabetes mellitus. An important gene associated with Primary Microcephaly-Epilepsy-Permanent Neonatal Diabetes Syndrome is IER3IP1 (Immediate Early Response 3 Interacting Protein 1). Affiliated tissues include brain.