title: The complexity of HLA class II (DRB1, DQB1, DM) associations with disseminated Mycobacterium avium complex infection among HIV-1-seropositive whites.
abstract: Earlier associations of polymorphism in classic HLA class II (DRB1 and DQB1) genes have been extended to include the accessory genes DMA and DMB as determinants of disseminated Mycobacterium avium complex (DMAC) infection among HIV-1-seropositive whites. From the Multicenter AIDS Cohort study, 176 DMAC cases were matched with 176 controls in a nested case-control study. PCR-based HLA genotyping techniques were used to resolve variants of DRB1 and DQB1 to their four-digit or five-digit alleles, and single-strand conformation polymorphism was used to resolve sequences in exon 3 at each DM locus. The DMA*0102 allele occurred less frequently among DMAC cases than among controls (OR = 0.46, p =.02). Combinations of DRB1 alleles with or without specific DMA and DMB variants showed significant differences in distributions between the cases and controls, but both of the previously associated class II alleles (DRB1*1501 and DRB1*0701) showed stronger positive associations with DMAC in the absence than in the presence of DMA*0102. Apparent joint effects of DRB1 and DM allelic combinations on occurrence and timing of DMAC suggest that class II disease relationships may be better predicted by biologically plausible interactive combinations than by polymorphisms in individual genes.
authors.affiliation: Department of Epidemiology and Biostatistics, University of South Florida, Tampa, Florida, USA.
authors.forename: Eknath
authors.initials: E
authors.lastname: Naik
authors.forename: Susan
authors.initials: S
authors.lastname: LeBlanc
authors.forename: Jianming
authors.initials: J
authors.lastname: Tang
authors.forename: Lisa P
authors.initials: LP
authors.lastname: Jacobson
authors.forename: Richard A
authors.initials: RA
authors.lastname: Kaslow
mesh_terms: D017088:AIDS-Related Opportunistic Infections / Q000276:immunology*; D000483:Alleles; D016022:Case-Control Studies; D015331:Cohort Studies; D014644:Genetic Variation; D006679:HIV Seropositivity / Q000276:immunology*; D015497:HIV-1; D006681:HLA-D Antigens / Q000235:genetics*; D006683:HLA-DQ Antigens / Q000235:genetics; D059866:HLA-DQ beta-Chains; D006684:HLA-DR Antigens / Q000235:genetics; D059811:HLA-DRB1 Chains; D006239:Haplotypes; D006801:Humans; D008297:Male; D015269:Mycobacterium avium Complex; D015270:Mycobacterium avium-intracellulare Infection / Q000276:immunology*; D014481:United States; D014505:Urban Population; D044465:White People
chemical_list: D006681:HLA-D Antigens; C084245:HLA-DM antigens; D006683:HLA-DQ Antigens; D059866:HLA-DQ beta-Chains; C057615:HLA-DQbeta antigen; D006684:HLA-DR Antigens; D059811:HLA-DRB1 Chains