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  • Title: Cloning of the laminin alpha 3 chain gene (LAMA3) and identification of a homozygous deletion in a patient with Herlitz junctional epidermolysis bullosa.
    Author: Vidal F, Baudoin C, Miquel C, Galliano MF, Christiano AM, Uitto J, Ortonne JP, Meneguzzi G.
    Journal: Genomics; 1995 Nov 20; 30(2):273-80. PubMed ID: 8586427.
    Abstract:
    Laminin 5 and laminin 6 are basement membrane proteins synthesized by the basal cells of stratifying squamous epithelia. Altered expression of laminin 5 has been associated with Herlitz junctional epidermolysis bullosa (H-JEB), a severe epidermal blistering disorder inherited as an autosomal recessive disease. We have isolated cDNA clones encoding the alpha 3 chain of laminin 5 and searched for mutations in the LAMA3 gene in H-JEB patients. In one H-JEB family, an affected individual exhibited drastically reduced immunoreactivity to antibodies directed against the alpha 3 chain of laminin 5 and an impaired expression of the corresponding mRNA transcripts. RT-PCR analysis of mRNA extracted from the proband's keratinocytes identified a homozygous single basepair deletion in the transcripts encoding the laminin alpha 3A and alpha 3B isoforms. The mutation causes a frameshift and premature termination codon in both alleles of the LAMA3 gene. Inheritance of the clinical H-JEB phenotype was consistent with the segregation of the mutated allele in the family. We also report the identity of the alpha chains of laminin 5 and epiligrin and provide evidence that LAMA3 transcripts are distinct from the laminin 6 alpha chain mRNA.
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