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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Genomic organization of collagenous domains and chromosomal assignment of human 180-kDa bullous pemphigoid antigen-2, a novel collagen of stratified squamous epithelium.

We have recently isolated a 1.0-kilobase (kb) cDNA encoding 180-kDa bullous pemphigoid antigen ( BPAG2), an autoantigen in blistering skin disease, bullous pemphigoid (Giudice, G. J., Squiquera, H. L., Elias, P. M., and Diaz, L. (1991) J. Clin. Invest. 87, 734-738). The deduced amino acid sequence identified two collagenous domains characterized by Gly-X-Y repeats. In this study we have elucidated the genomic organization of the corresponding segment in the human BPAG2 gene. Screening of a genomic lambda-phage DNA library yielded six overlapping clones, and the sequences corresponding to the 1.0-kb cDNA spanned approximately 12 kb of genomic DNA. The coding segment consisted of 19 separate exons varying in size from 27 to 222 base pairs. The organization of these exons and the splice sites at the intron-exon junctions were clearly different from other fibrillar and nonfibrillar collagen genes described to date. The BPAG2 gene was mapped by chromosomal in situ hybridization to the long arm of human chromosome 10, at locus 10q24.3; this location is distinct from any previously mapped collagens, and it also distinguishes BPAG2 from BPAG1, a 230-kDa bullous pemphigoid antigen, which has been mapped to chromosome 6p (Sawamura, D., Nomura, K., Sugita, Y., Mattei, M.-G., Chu, M.-L., Knowlton, R.G., and Uitto, J. (1990) Genomics 8, 722-726). These data suggest that BPAG2 is a novel collagen present in stratified squamous epithelia.[1]


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