Associations between HLA class II alleles in a North Indian population.
The HLA DR and DQ class II genes are in strong linkage disequilibrium and recombinaton is quite rare. However, many different DR-DQ haplotypes appear to have developed during evolution, giving rise to a variety of combinations with different distributions in populations. In the present report, 138 subjects from North India were studied for the alleles of HLA-DRB1, DRB3, DRB5, DQB1 and DQA1 loci using PCR-oligotyping. The probable haplotypes were constructed based on two-locus associations observed in this population. A frequent haplotype in this population, DRB1*1501-DRB5*0101-DQA1*0103-DQB1*0601, has been reported very rarely in other ethnic groups. Other DR2 haplotypes, like DRB1*1502-DRB5*0102-DQA1*0103-DQB1*0601, earlier reported in Caucasians, Chinese and Latin Americans, and DRB1*1502-DRB5*0102-DQA1*0103-DQB1*0503, earlier reported in Gypsies, were also observed. A relatively rare haplotype in Caucasians which was earlier reported in Gypsies from the Czech Republic, DRB1*1404-DRB3*0202-DQA1*0101-DQB1*0503, was observed frequently in Indians, suggesting the probable migration of Gypsies from India. The results suggest that the North Indian population contains a mixture of Caucasoid, Black and Chinese genes. Similarities with Gypsies and South-East Asian populations suggest the role of ancient migrations from India.
Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas 75235-8886, USA.
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D000483:Alleles; D005787:Gene Frequency; D005802:Genes, MHC Class II; D006683:HLA-DQ Antigens / Q000235:genetics* / Q000276:immunology; D006684:HLA-DR Antigens / Q000235:genetics* / Q000276:immunology; D006239:Haplotypes; D006801:Humans; D007194:India; D044469:Racial Groups
D006683:HLA-DQ Antigens; D006684:HLA-DR Antigens