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

Characterization of an expressible nonclassical class I HLA gene.

Screening of a human cosmid library representing genomic DNA from an individual homozygous for the HLA-DR2 B7 A2 haplotype yielded 109 class I HLA-specific clones. One cosmid clone, Ice 6.23, had a full-length nonclassical class I gene within a 5.4-kb HindIII fragment. The Ice 6.23-5.4H gene was cloned into the unique NotI site of an expression vector pSV2.Not, a derivative of pSV2neo, which was constructed to contain a second SV40 early region promoter adjacent to an introduced NotI site. The resulting construct was transfected into the P815-B2M cell line, a derivative of the mouse mastocytoma P815 (HTR) line which expressed human beta2-microglobulin following stable transfection with a cloned human beta2-microglobulin gene. Following transfection the Ice 6.23-5.4 H gene was found to be expressed at both the mRNA and cell surface product levels. DNA sequencing of this gene suggests that it is allelic to the HLA-6.0 gene clone (HLA-G) of Geraghty et al. (Proceedings of the National Academy of Sciences USA, 84:9145, 1987); thereby revealing a HindIII restriction fragment length polymorphism at the HLA-G locus. An extraordinarily high degree of sequence similarity (99.92%) between these two genes, which derive from unrelated HLA haplotypes, suggests strong conservative selection pressure at the HLA-G locus. A flanking single copy sequence probe 4 kb distant from the Ice 6.23-5.4H gene was used to generate long-range restriction mapping at the HLA-G locus.[1]


  1. Characterization of an expressible nonclassical class I HLA gene. Pook, M.A., Woodcock, V., Tassabehji, M., Campbell, R.D., Summers, C.W., Taylor, M., Strachan, T. Hum. Immunol. (1991) [Pubmed]
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