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The Journal of Immunology, Vol 142, Issue 3 836-841, Copyright © 1989 by American Association of Immunologists

ARTICLES

Molecular characterization by high resolution isoelectric focusing of the products encoded by the class II region loci of the MHC in humans. II. DP alpha and DP beta gene variants

S Rodriguez de Cordoba, P Marshall and P Rubinstein
Department of Immunogenetics, New York Blood Center 10021.

To characterize the molecular polymorphism of the DP alpha and DP beta gene products, the HLA-DP molecules expressed by more than 200 cell lines were individually immunoprecipitated by using the mAb B7/21 and their neuraminidase-treated DP alpha and DP beta chains analyzed in IEF gels. These cell lines, most of them from members of 32 families, allowed the definition, by segregation analysis, of the IEF patterns of the DP polypeptide chains encoded by 129 distinct haplotypes. Both DP alpha and DP beta chains display polymorphic IEF-banding patterns. Two DP alpha (A and B) and seven DP beta (A, B, C, D, E, F, and G) IEF variants were characterized. The DP alpha B variant was found in linkage disequilibrium with both DP beta B and DP beta D. Linkage disequilibrium was also encountered with alleles at the DR and DQ loci. Finally, the correlations between the IEF DP alpha and DP beta variants and the primed lymphocyte test-defined HLA-DP specificities were determined by using a panel of 24 primed lymphocyte test-typed cell lines.




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