Progressive symmetric erythrokeratoderma of Gottron (PSEK) is commonly distinguished from erythrokeratodermia variabilis Mendes da Costa (EKV). However, conclusive proof that the disorders are identical is still lacking. We performed mutation analysis and microsatellite haplotyping in two independently referred patients with PSEK and three patients from a previously published family with EKV. All patients had the same mutation in the GJB4 gene causing the amino acid substitution p.Gly12Asp (G12D). Haplotype analysis showed that all five patients had the same allelic haplotype over 2 Mb covering the disease locus. Apparently, the same GJB4 mutation may cause either an EKV or a PSEK phenotype. A single ancestral founder might have introduced EKV in the Netherlands.

Connexin30.3, Erythrokeratodermia variabilis, GJB4, Gap junction, Haplotyping, Progressive symmetric erythrokeratoderma
dx.doi.org/10.1002/ajmg.a.32744, hdl.handle.net/1765/24055
American Journal of Medical Genetics. Part A
Erasmus MC: University Medical Center Rotterdam

van Steensel, M.A.M, Oranje, A.P, van der Schroeff, J.G, Wagner, A, & van Geel, M. (2009). The missense mutation G12D in connexin30.3 can cause both erythrokeratodermia variabilis of mendes da Costa and progressive symmetric erythrokeratodermia of Gottron. American Journal of Medical Genetics. Part A, 149(4), 657–661. doi:10.1002/ajmg.a.32744