A homozygous nonsense mutation in the beta 3 chain gene of laminin 5 (LAMB3) in Herlitz junctional epidermolysis bullosa

Genomics. 1994 Nov 15;24(2):357-60. doi: 10.1006/geno.1994.1627.


Herlitz junctional epidermolysis bullosa (H-JEB) is a severe autosomal recessive disorder characterized by blister formation within the dermal-epidermal basement membrane. Based on immunofluorescence analysis recognizing laminin 5 epitopes (previously known as nicein/kalinin), the genes for this lamina lucida protein have been proposed as candidate genes in H-JEB. In this study, we examined the gene encoding the beta 3 polypeptide chain of laminin 5 (LAMB3) by Northern hybridization and RT-PCR analysis of keratinocyte mRNA from a proband in a family with H-JEB. Northern analysis revealed markedly reduced levels of the laminin beta 3 chain mRNA. Amplification of mRNA by RT-PCR, followed by direct nucleotide sequencing, revealed a homozygous C-to-T transition resulting in a premature termination codon (CGA --> TGA) on both alleles. This mutation was verified at the genomic DNA level, and both parents were shown to be heterozygous carriers of the same mutation. This is the first description of a mutation in the laminin beta 3 chain gene (LAMB3) of laminin 5 in an H-JEB patient.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Base Sequence
  • DNA Primers
  • Epidermolysis Bullosa, Junctional / genetics*
  • Female
  • Homozygote*
  • Humans
  • Infant, Newborn
  • Laminin / chemistry
  • Laminin / genetics*
  • Male
  • Molecular Sequence Data
  • Mutation*
  • Pedigree
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism


  • DNA Primers
  • Laminin
  • RNA, Messenger