Genetic studies of 20 Japanese families of dystrophic epidermolysis bullosa

概要

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Dystrophic EB (DEB) is clinically characterized by mucocutaneous blistering in response to minor trauma, followed by scarring and nail dystrophy, and is caused by mutations in the COL7A1 gene encoding type VII collagen. DEB is inherited in either an autosomal dominant (DDEB) or recessive (RDEB) fashion. DDEB basically results from a glycine substitution mutation within the collagenous domain on one COL7A1 allele, while a combination of mutations such as premature stop codon, missense, splice-site mutations on both alleles causes RDEB. This study performed mutation analysis in 20 distinct Japanese DEB families (16 RDEB and 4 DDEB). The result demonstrated 30 pathogenic COL7A1 mutations with 16 novel mutations, which included 4 missense, 5 nonsense, 1 deletion, 2 insertion, 1 indel, 3 splice-site mutations. We confirmed that Japanese COL7A1 mutations were basically family specific although 3 mutations 5818delC, 6573+1G>C, E2857X were recurrent based on previous reports. Furthermore, Q2827X mutation found in two unrelated families would be regarded as a candidate recurrent Japanese COL7A1 mutation. The study furthers our understanding of both the clinical and allelic heterogeneity displayed in Japanese DEB patients.
Springerの論文
2005-10-01