Abstract
Erythrokeratodermia variabilis (EKV, OMIM 133200) is an autosomal dominant genodermatosis with considerable intra- and interfamilial variability1. It has a disfiguring phenotype characterized by the independent occurrence of two morphologic features: transient figurate red patches and localized or generalized hyperkeratosis (Fig. 1). Both features can be triggered by external factors such as trauma to the skin. After initial linkage to the RH locus on 1p (Refs 2,3 ), EKV was mapped to an interval of 2.6 cM on 1p34-p35, and a candidate gene ( GJA4 ) encoding the gap junction protein α-4 (connexin 31, Cx31) was excluded by sequence analysis4. Evidence in mouse suggesting that the EKV region harbours a cluster of epidermally expressed connexin genes5,6 led us to characterize the human homologues of GJB3 (encoding Cx31) and GJB5 (encoding Cx31.1). GJB3, GJB5 and GJA4 were localized to a 1.1-Mb YAC in the candidate interval. We detected heterozygous missense mutations in GJB3 in four EKV families leading to substitution of a conserved glycine by charged residues (G12R and G12D), or change of a cysteine (C86S). These mutations are predicted to interfere with normal Cx31 structure and function, possibly due to a dominant inhibitory effect. Our results implicate Cx31 in the pathogenesis of EKV, and provide evidence that intercellular communication mediated by Cx31 is crucial for epidermal differentiation and response to external factors.
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Acknowledgements
The authors are grateful to the families for their generous participation in our studies, and to the Foundation for Ichthyosis and Related Skin Types and the National Registry for Ichthyosis for patient referral. We also appreciate the expert research nursing assistance by M. Miller and M. Anderson, and outstanding technical services of G. Poy in oligonucleotide synthesis and DNA sequencing. D.H. and P.I. were supported by the Swiss National Science Foundation.
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Richard, G., Smith, L., Bailey, R. et al. Mutations in the human connexin gene GJB3 cause erythrokeratodermia variabilis. Nat Genet 20, 366–369 (1998). https://doi.org/10.1038/3840
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DOI: https://doi.org/10.1038/3840
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