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We have compared the sequence polymorphism of HLA class II genes of two distinct DRw6 haplotypes. cDNA libraries were constructed from two lymphoblastoid cell lines: CB6B (10w9060) which types as DRw13 DQw1, and AMALA (10w9064) which types as DRw14 DQw3. Multiple sequence differences were found at the DR beta I, DQ alpha, and DQ beta loci when these two haplotypes were compared. The DR beta I allele found in the DRw14 DQw3 haplotype appears to have diverged primarily as a result of a gene conversion event with a DR1 allele acting as donor. In contrast, the DRw13 DQw1 haplotype appears to have arisen by means of a recombination event between the DR and DQ subregions. Thus, multiple genetic mechanisms, including point mutation, gene conversion, and recombination, have generated diversity among DRw6 haplotypes.
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QJM : monthly journal of the Association of Physicians,
