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MEDNIK syndrome, previously known as Erythrokeratodermia Variabilis type 3 (EKV3), has characteristics of intellectual deficit, enteropathy, sensorineural hearing loss, peripheral neuropathy, lamellar and erythrodermic ichthyosis and keratodermia. The syndrome has been described in four families descending from limited number of ancestors in Quebec. The disease is due to a mutation in the AP1S1 gene encoding the small subunit sigma1A of the AP-1 complex. Transmission is autosomal recessive.
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