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  • Title: Predictability of alloreactivity among unrelated individuals: role for HLA-DPB1.
    Author: Awdeh ZL, Alper CA, Fici DA, Ronco P, Yunis EJ.
    Journal: Tissue Antigens; 1995 Sep; 46(3 ( Pt 1)):180-6. PubMed ID: 8525477.
    Abstract:
    We compared the mixed lymphocyte culture reaction (MLR-1) among unrelated individuals who are carriers of the extended haplotype [HLA-B8,SC01,DR3,DRB1*0301,DQB1*0201] on one chromosome and the generic specificity HLA-DR4 on the second chromosome. Genomic DNA samples from the same individuals were also analyzed for HLA-DRB1, DQB1 and DPB1 alleles by PCR and SSOPH typing and for DOB polymorphism by RFLP. HLA-DRB1 alleles, in paired MLR responses between unrelated individuals indicated that matching of HLA-DRB1 was a better predictor of non-reactivity than identity in HLA-DR generic types, (43% vs 22%). Moreover, 90% of the DRB1 matched pairs had nonreactive and weakly reactive MLR, whereas only 37% of DRB1 mismatched unrelated individuals gave weak or no reactions. Matching for HLA-DRB1 and HLA-DPB1 alleles eliminates a significant number of cell mixtures with MLR-I reactivity. Furthermore, some DPB1 mismatches, but not all, do not seem to elicit MLR-I reactivity.
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