Splice site mutation in COL7A1 resulting in aberrant in-frame transcripts identified in a case of recessive dystrophic epidermolysis bullosa, pretibial

Takuji Masunaga, Akiharu Kubo, Akira Ishiko

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Abstract

Dystrophic epidermolysis bullosa (DEB), pretibial, a rare subtype of epidermolysis bullosa (EB), is characterized by recurrent blisters and erosions predominantly on the pretibial region. We report the case of a 60-year-old Japanese woman with persistent blistering eruptions and scar formation on the pretibial region and elbows. Mutational analysis revealed a previously reported c.5797C>T mutation in exon 70 (p.R1933X) and a novel c.6348+1G>A mutation in intron 76 of COL7A1. Reverse transcription polymerase chain reaction revealed that the c.6348+1G>A mutation resulted in the skipping of exon 76 (69 bp) and the retention of intron 76 (75 bp), and both transcripts were in-frame. From these results, we diagnosed the patient as having recessive DEB, pretibial. A review of previously reported mutations in DEB, pretibial, revealed that one-third of DEB, pretibial, cases showed a recessive inheritance pattern, and no case had a combination of premature termination codon (PTC)/PTC mutations. The DEB, pretibial, case described herein is the first reported case of a compound heterozygote with PTC/in-frame mutations. Although no special characteristic features of the mutations were identified, a high diversity of COL7A1 mutations was shown even in DEB, pretibial.

Original languageEnglish
JournalJournal of Dermatology
DOIs
Publication statusAccepted/In press - 2018 Jan 1

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Keywords

  • Basement membrane
  • Blistering disease
  • Genodermatosis
  • Splice site mutation
  • Type VII collagen

ASJC Scopus subject areas

  • Dermatology

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