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Knuckle pads, in an epidermal palmoplantar keratoderma patient with Keratin 9 R163W transgrediens expression
European Journal of Dermatology. Volume 19, Number 2, 114-8, March-April 2009, Genes and skin
Free Article
Author(s) : Andrea Codispoti, Enrico Colombo, Loredana Zocchi, Valeria Serra, Ginevra Pertusi, Giorgio Leigheb, Rossana Tiberio, Guido Bornacina, Riccardo Zuccoli, Antonio Ramponi, Elena Campione, Gerry Melino, Alessandro Terrinoni
Summary : Epidermolytic PalmoPlantar keratoderma (EPPK) Vörner-type is an autosomal dominantly inherited skin disease, characterized by severe thickening of the palms and soles, caused by mutations in the keratin K9 (KRT9) gene. To date, a number of KRT9 mutations have been detected, most of which affect the highly conserved 1A region of the central alpha-helical domain, important for keratin heterodimerization. The most common mutation is the substitution of the arginine in position 163 with a tryptophan (R163W), which has been reported in North American, European, and Japanese populations. In a small number of cases, EPPK is associated with knuckle pad keratosis, but no correlation between this additional phenotype and a specific mutation has been found. Moreover, K9 is not normally expressed in knuckle skin, raising the question of the pathogenic mechanism leading to this additional phenotype. Here we show that in a family affected by EPPK and knuckle pad keratosis, carrying the R163W substitution, wild type (wt) and mutated K9 are strongly expressed in knuckle pads. These results suggest that the knuckle pad phenotype is due to ectopical expression of K9.
Keywords : epidermolytic palmoplantar keratoderma, keratin 9, knuckle pads, R163W mutation, keratin diseases

Knuckle pads, in an epidermal palmoplantar keratoderma patient with Keratin 9 R163W transgrediens expression