Genotype-phenotype correlation in Chinese patients with dystrophic epidermolysis bullosa pruriginosa

Acta Derm Venereol. 2012 Jan;92(1):50-3. doi: 10.2340/00015555-1178.

Abstract

Dystrophic epidermolysis bullosa pruriginosa (DEB-Pr) is a rare variant of dystrophic epidermolysis bullosa (DEB) due to dominant or recessive mutations in the COL7A1 gene. More than 40 mutations in COL7A1 have been described in DEB-Pr. The aim of this study was to understand the genotype-phenotype correlation in Chinese patients with DEB-Pr. Three Chinese families with typical clinical features of DEB-Pr were studied. The results were analysed in association with the eight Chinese DEB-Pr patients reported in the literature. In the three Chinese families with DEB-Pr, we found two dominant cases with G1773R and c.6900+1G>C mutations, and one case with heterozygous G2701W mutation of uncertain inheritance mode. In the 10 Chinese patients with dominant type of DEB-Pr, 7 glycine substitutions and three splicing site mutations of exon 87 skipping were identified. Glycine substitution mutations in the triple helix region and exon 87 skipping, leading to the in-frame deletion of 23 amino acid residues in the triple-helix, are often seen in Chinese patients with dominant DEB-Pr, although the glycine substitutions are also frequently present in dominant DEB.

MeSH terms

  • Adult
  • Amino Acid Substitution / genetics
  • Asian People / genetics*
  • Child
  • China
  • Collagen Type VII / genetics*
  • DNA Mutational Analysis
  • Epidermolysis Bullosa Dystrophica / complications
  • Epidermolysis Bullosa Dystrophica / genetics*
  • Exons
  • Female
  • Genotype
  • Glycine / genetics
  • Humans
  • Male
  • Mutation
  • Phenotype
  • Prurigo / complications
  • Prurigo / genetics*
  • RNA Splice Sites
  • RNA, Messenger / genetics*
  • Young Adult

Substances

  • COL7A1 protein, human
  • Collagen Type VII
  • RNA Splice Sites
  • RNA, Messenger
  • Glycine