Identification of novel type VII collagen gene mutations resulting in severe recessive dystrophic epidermolysis bullosa

Clin Exp Dermatol. 2005 May;30(3):289-93. doi: 10.1111/j.1365-2230.2005.01763.x.

Abstract

In this work, we studied the proband in a small nuclear family of Chinese and Dutch/German descent and identified two novel mutations in the type VII collagen gene leading to recessive dystrophic epidermolysis bullosa, Hallopeau-Siemens variant (HS-RDEB). The maternal mutation is a single base pair deletion of a cytosine nucleotide in exon 26, designated 3472delC, resulting in a frameshift and a premature termination codon (PTC) within the same exon, 7 bp downstream of the site of the mutation. The paternal mutation is a G-->A transition located at the 5' donor splice site within intron 51, designated IVS51 + 1G-->A. This mutation leads to the activation of a cryptic splice site, 32 bp downstream of the mutation site and to subsequent aberrant out-of-frame splicing, resulting in two alternative mRNA transcripts and a downstream PTC. To our knowledge, these two mutations have not been previously reported. These findings extend the body of evidence for compound heterozygous mutations leading to HS-RDEB and provide the basis for prenatal diagnosis in this family.

Publication types

  • Case Reports
  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Base Sequence
  • Collagen Type VII / genetics*
  • DNA Mutational Analysis
  • Epidermolysis Bullosa Dystrophica / genetics*
  • Epidermolysis Bullosa Dystrophica / pathology
  • Genes, Recessive
  • Humans
  • Infant
  • Male
  • Molecular Sequence Data
  • Mutation*
  • Pedigree

Substances

  • Collagen Type VII