Mednik Syndrome, also known as erythrokeratodermia variabilis 3, is related to disorder of copper metabolism and cerebral dysgenesis, neuropathy, ichthyosis, and palmoplantar keratoderma syndrome, and has symptoms including diarrhea An important gene associated with Mednik Syndrome is AP1S1 (Adaptor Related Protein Complex 1 Subunit Sigma 1), and among its related pathways/superpathways are Innate Immune System and Vesicle-mediated transport. Affiliated tissues include skin and brain, and related phenotypes are intellectual disability and ichthyosis