HLA-D typing in Austria. A panel study using 26 newly defined homozygous typing cells

HLA-C locus antigens seen by one-dimensional isoelectric focusing: definition of the so far known HLA-C specificities and of two subtypes

A panel of homozygous typing cells was employed for biochemical definition of all known HLA-C locus antigens from Cw1 through Cw11. Each HLA-C antigen yielded, after precipitation with one of the monoclonal antibodies W6/32, 4E, or HC10, a specific banding pattern on one-dimensional isoelectric focusing gels. In addition, two biochemical subtypes of Cw1 and Cw7 could be identified. These biochemical HLA-C "splits" were characterized not only by different isoelectric points but also by strong linkage disequilibriums with certain HLA-B antigens.

Extended HLA haplotypes in families with insulin-dependent diabetes mellitus in northern Finland

Haplotypes including HLA, Bf and C4 loci were analyzed in a material comprising 55 families with diabetic children. One hundred and ten haplotypes found in IDDM patients were compared with 101 haplotypes present only in healthy family members. Two complotypes, BfSC4A3B3 and SC4A0B1, were significantly more common (P less than 0.05) in the diabetic haplotypes, and these were in most cases found in haplotypic combinations with HLA-B15,Dw4,DR4 and HLA-B8,Dw3,DR3 genes, respectively. The B8/DR3 haplotype was better conserved, as 72% included the BfSC4A0B1 complotype as compared with only 35% of the B15/DR4 haplotypes with "high risk" C4A3B3 complement alleles (p less than 0.05). DR3 was found in 26% of the diabetic haplotypes and DR4 in 43%. DR4 associated with the Dw4 in 69% of cases and with Dw14 in 26% of the diabetic haplotypes. Our results confirm that the two phenotypes found earlier to be associated with IDDM in Northern Finland, e.g. "B15,BfS,C4A3B3,Dw4,DR4" and "B8,Bfs,C4A0B1,Dw3,DR3" are inherited as haplotypes.