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Cellular DNAs from individuals of 23 families were digested with five restriction endonucleases (Pvu II, EcoRI, HindIII, BamHI, and EcoRV) and then probed with a DX alpha-chain gene probe. Seventeen allogenotopes were observed, each of which could be assigned to a serologically defined haplotype by noting its segregation in families. Six sets of allogenotopes forming allelic series were noted. In comparison with restriction maps of the DQ alpha and the DX alpha regions, each of these series has been assigned to the DQ alpha or the DX alpha locus. Allogenotopes of the four DQ alpha series constitute three clusters correlating with the supertypic groups of class II histocompatibility antigens DQw1 (DR1, DR2, and DRw6), DRw53 (DR4, DR7, and DR9), and DR3 plus DR5 plus DR8. These 13 DQ alpha fragments constitute 22 different patterns. The two DX alpha series constitute two clusters, one of which is not found to be correlated strongly with DR specificities, whereas the other is correlated loosely (r = 0.45) with DR5 and DR7. This absence of strong linkage disequilibrium between the DX alpha series and the DR series contrasts with the DQ alpha series and suggests a recombination point between DQ alpha and DX alpha loci.

Exuberant restriction fragment length polymorphism associated with the DQ alpha-chain gene and the DX alpha-chain gene.