IAP insertion in the murine LamB3 gene results in junctional epidermolysis bullosa
Copyright policy )IAP insertion in the murine LamB3 gene results in junctional epidermolysis bullosa
The laminin-5 molecule functions in the attachment of various epithelia to basement membranes. Mutations in the laminin-5-coding genes have been associated with Herlitz junctional epidermolysis bullosa (HJEB), a severe and often lethal blistering disease of humans. Here we report the characterization of a spontaneous mouse mutant with an autosomal recessive blistering disease. These mice exhibit sub-epithelial blisters of the skin and mucosal surfaces and abnormal hemidesmosomes lacking sub-basal dense plates. By linkage analysis the genetic defect was localized to a 2-cM region on distal Chromosome (Chr) 1 where a laminin-5 subunit gene, LamB3, was previously localized. LamB3 mRNA and laminin-5 protein were undetectable by Northern blot analysis and immunohistochemical methods, respectively. DNA sequence analysis indicated that the LamB3 genetic defect resulted from disruption of the coding sequence by insertion of an intracisternal-A particle (IAP) at an exon/intron junction. These findings suggest a role for laminin-5 in hemidesmosome formation and indicate that the LamB3(IAP) mutant is a useful mouse model for HJEB.
- Wadsworth Center United States
- New York State Department of Health United States
Male, Mice, Inbred C3H, Chromosome Mapping, Gene Expression Regulation, Developmental, Mice, Inbred Strains, Blotting, Northern, Polymerase Chain Reaction, Skin Diseases, Disease Models, Animal, Mice, Phenotype, Mutation, DNA Transposable Elements, Animals, Female, Kalinin, Epidermolysis Bullosa, Junctional, Cell Adhesion Molecules, Skin
Male, Mice, Inbred C3H, Chromosome Mapping, Gene Expression Regulation, Developmental, Mice, Inbred Strains, Blotting, Northern, Polymerase Chain Reaction, Skin Diseases, Disease Models, Animal, Mice, Phenotype, Mutation, DNA Transposable Elements, Animals, Female, Kalinin, Epidermolysis Bullosa, Junctional, Cell Adhesion Molecules, Skin
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