HLA antigens in South India: II. Selected caste groups of Tamil Nadu

Abstract
HLA-A, B antigen and haplotype frequencies were studied in four different caste groups of Tamil Nadu living in Madurai. A total number of 101 Nadars, 36 Kallars, 54 Iyers and 57 Telugu-speaking Naidus were studied. HLA A3 and B15 were significantly higher in Nadars; A10 and B8 in Kallars and Aw19, B12 and B35 in Iyers. HLA A-B haplotypes A10-B7, A28-B17 and A24-B- were characteristic of Nadars; A10-B8 and A1-B-, Kallars; Aw19-B12 and A1-B15, Iyers and A2-B-, Naidus. Negative linkage disequilibria for Aw19-B7, A28-B15 and A9-B51 were significant in Nadars; A1-B5, A1-B12 and Aw19-B- in Iyers and A2-B17 in Naidus. Heterogeneity chi-square based on antigen frequency and genetic distance also suggest the heterogeneous nature of the population of South India. Will these caste groups with such diverse haplotypic combinations differ from one another in their immune response and susceptibility to a given epidemic or infection?