Abstract
A genomic clone specifying a new HLA class II antigen β chain,DQB3, was isolated from a human genomic phage library using aDQB1 cDNA probe under low stringency conditions. Southern hybridization and nucleotide sequence analyses identified the β2 domain exon (exon 3) with several deleterious mutations and the CP-TM-CY exon [connecting peptide, transmembrane, and cytoplasmic regions, (exon 4)], but the first, second, and fifth exons encoding the 5′ UT-leader, the β1 domain, and the 3′ UT domain of normal β chains, respectively, were entirely missing. The nucleotide sequences of these two exons were distinct from those of other class II β chain genes, but slightly more related to theDQB1 andDQB2 genes than to other class II genes. TheDQB3 sequence mapped betweenDQA2 andDQB1, 15 kb upstream fromDQA2, by analysis of overlapping cosmid clones. This mapping was supported by the fact thatTaq I,Msp I, andBam HIDQB3 polymorphisms were perfectly correlated with theDQA2 polymorphism and not with any polymorphisms in theDR orDQ subregion, suggesting the presence of a hot spot for recombination betweenDQB3 andDQB1.
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Abbreviations
- CP-TM-CY exon:
-
connecting peptide, transmembrane, and cytoplasmic exon
- RFLP:
-
restriction fragment length polymorphism
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The nucleotide sequence data reported in this paper have been submitted to the GenBank nucleotide sequence database and have been assigned the accession number M26577.
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Ando, A., Kawai, J., Maeda, M. et al. Mapping and nucleotide sequence of a newHLA class II light chain gene,DQB3 . Immunogenetics 30, 243–249 (1989). https://doi.org/10.1007/BF02421327
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DOI: https://doi.org/10.1007/BF02421327