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We have characterized HLA-DRB, -DQA, and -DQB gene polymorphism in a large number of serologically DR blank haplotypes with the restriction enzymes Taq I, Bam HI, and Pvu II, with the aim of finding new RFLPs in the Caucasian population. Locus-specific RFLPs were combined for a definition of Taq I DR-DQ haplotypes. All observed DNA haplotypes could be found in a control group of 100 individuals, but with a different distribution. Serologically less well-defined specificities were over-represented in the blank group, in particular the DRw13-associated Taq I DR-DQ haplotype T-13.3. We conclude that the majority of DR blank haplotypes are probably closely related or identical to previously defined DR alleles. The extent of DR polymorphism in the Caucasian population seems to be well mapped, considering the extremely small proportion of rare Taq I DR-DQ haplotypes and lack of new patterns in this study.
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