© 1995 Oxford University Press
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A homozygous nonsense mutation in the 
3 chain gene of laminin 5 (LAMA3) in lethal (Herlitz) junctional epidermolysis bullosa
1Departments of Dermatology Philadelphia, PA 19107, USA 2Department of 2 and Molecular Biology, Jefferson Medical College, Section of Molecular Dermatology Jefferson Institute of Molecular Medicine, Thomas Jefferson University Philadelphia, PA 19107, USA 3ST John's Institute of Dermatology St Thomas' Hospital London, UK 4INSERM U235 Faculte de Medicine Nice, France
*To whom correspondence should be addressed
Received January 30, 1995; Revised February 23, 1995; Accepted March 23, 1995
The inherited mechanobullous disorder, junctional epidermolysis bullosa (JEB), is characterized by extensive blistering and erosions of the skin and mucous membranes. The diagnostic hallmarks of JEB include ultrastructural abnormalities in the hemidesmosomes of the cutaneous basement membrane zone, as well as an absence of staining with anti bodies against the anchoring filament protein, laminin 5. Therefore, the three genes encoding 
3, ß3 and 
2 chains of laminin 5, known as LAMA3, LAMB3 and LAMC2, are candidate genes for JEB. We have previously demonstrated mutations in the LAMB3 and LAMC2 genes in several families with JEB. We initiated mutation analysis from an affected child by PCR amplification of individual LAMA3 exons, followed by heteroduplex analysis. Nucleotide sequencing of heteroduplexes identified a homozygous nonsense mutation within domain I/II of the 3 chain. These findings provide the first evidence that nonsense mutations within the LAMA3 gene are also involved in the pathogenesis of JEB, and indicate that mutations of all three genes of laminln 5 can result in the JEB phenotype.
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