Abstract
Restriction endonuclease digestion of genomic DNA from 24 lymphoblastoid cell lines homozygous for the HLA class II specificity DQw3, followed by hybridization with a DQ beta-chain cDNA probe, identified a genomic polymorphism with variable BamHI and HindIII recognition sites. This restriction fragment pattern was found for several haplotypes associated with the DQw3 specificity, including some haplotypes positive for the HLA-DR specificities DR4, DR5, DRw8, and DRw12. The variant fragment pattern corresponds precisely with the reactivity of a monoclonal antibody, A-10-83, previously shown to define a serologic split of DQw3. Serologic detection of the specific DQw3.1 genomic polymorphism indicated that the corresponding DQ beta-chain variants are expressed. This polymorphic restriction fragment pattern, then, represents a selective marker for DQ beta-chain genes that appear to define a DQ beta-chain-associated specificity, here called DQw3.1.
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