title: A haplotype study of HLA complex with special reference to the HLA-DR series and to Bf. C2 and glyoxalase I polymorphisms.
abstract: Fifty-three French families were typed for alleles at seven loci of the HLA complex (HLA-A, -B, -C, -DR, -Bf, -C2 and -GLO) and 212 haplotypes were demonstrated. Eleven recombinations were observed (two A/B, two A/C, two B/Bf, one Bf/D and four D/GLO). The linkage disequilibrium was calculated not only between two alleles (delta) but between three, four...seven alleles (D). In order to compare the intensity of D values in the various haplotypes, the influence of the differences in gene frequencies was eliminated by the introduction of the standardized Ds (Ds = D/D max). The number of haplotypes in disequilibrium is relatively limited since most of the significant Ds involved about 17 haplotypes. For some haplotypes, the disequilibrium covered the whole distance from A to GLO but the stronger disequilibrium concerns the C to Bf or C to DR segment. Three hypotheses (isolation, admixture of population and selection) concerning the formation and maintenance of the disequilibria are discussed.
mesh_terms: D000939:Epitopes; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006680:HLA Antigens / Q000032:analysis; D006650:Histocompatibility Testing; D006801:Humans; D007791:Lactoylglutathione Lyase / Q000235:genetics*; D008190:Lyases / Q000235:genetics*; D008285:Major Histocompatibility Complex; D008297:Male; D011110:Polymorphism, Genetic; D011995:Recombination, Genetic
chemical_list: D000939:Epitopes; D006680:HLA Antigens; D008190:Lyases; D007791:Lactoylglutathione Lyase