Knuckle pads, in an epidermal palmoplantar keratoderma patient with Keratin 9 R163W transgrediens expression.
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.
Codispoti
Andrea
A
IDI-IRCCS Biochemistry laboratory c/o Dep. of Experimental Medicine, University of Tor Vergata, Via Montpellier, 1. 00133 Rome, Italy.
Colombo
Enrico
E
Zocchi
Loredana
L
Serra
Valeria
V
Pertusi
Ginevra
G
Leigheb
Giorgio
G
Tiberio
Rossana
R
Bornacina
Guido
G
Zuccoli
Riccardo
R
Ramponi
Antonio
A
Campione
Elena
E
Melino
Gerry
G
Terrinoni
Alessandro
A
D005260:Female; D005385:Fingers / Q000002:abnormalities*; D006801:Humans; D007558:Italy; D053534:Keratin-9 / Q000235:genetics*; D053546:Keratoderma, Palmoplantar, Epidermolytic / Q000235:genetics*; D008297:Male; D020125:Mutation, Missense; D010375:Pedigree; D010641:Phenotype; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017422:Sequence Analysis, DNA
D053534:Keratin-9