Disease Information for Vohwinkel syndrome (1q21)

Gene locus 1q21; Vohwinkel syndrome: A genetic disorder characterized by hearing loss and thickened skin, particularly on the knuckles; The sensorineural hearing is mild-to-moderate in degree; The thickening of the skin (hyperkeratosis) can be "mutilating" and cause autoamputation of the digits [Ainhum]; The syndrome is inherited in an autosomal dominant manner;It is caused by mutation in the GJB2 gene (connexin 26); The mutation is the replacement of aspartic acid with histidine at position 66 in the protein"s chain of amino acids; This mutation is also written as Asp66His; Terminal keratinocyte differentiation involves coordinated expression of several functionally interdependent genes, many of which have been mapped to the epidermal differentiation complex on 1q21; [Vohwinkel syndrome]; Sequencing of the loricrin gene revealed an insertion mutation thought to be responsible for the impaired cornification; starfish keratoses with deafness but no ichthyosis, and the other with keratoderma and ichthyosis; Classic and variant forms of Vohwinkel syndrome are clinically and ultrastructurally distinct and that the classic form does not map to the loricrin locus; loricrin keratodermas with variant Vohwinkel syndrome and also progressive symmetric erythrokeratodermia; Some were initially diagnosed as having nonbullous congenital ichthyosiform erythroderma, but later developed palmoplantar keratoderma with pseudoainhum;

---------[OMIM November 2004]---------------

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