Please use this identifier to cite or link to this item:
|Title:||Linkage disequilibrium with HLA-DRB1-DQB1 haplotypes explains the association of TNF-308G > a variant with Type 1 Diabetes in a brazilian cohort|
|Author:||Patente, Thiago A.|
Monteiro, Maria B.
Vieira, Suzana M.
Rossi da Silva, Maria E.
Azevedo, Mirela J.
Canani, Luis H.
Parisi, Maria C.
Pavin, Elizabeth J.
Coimbra, Cassio N.
Correa-Giannella, Maria Lucia
|Abstract:||A functional variant in the promoter region of the gene encoding tumor necrosis factor (TNF; rs1800629, -308G>A) showed to confer susceptibility to T1D. However, TNF rs1800629 was found, in several populations, to be in linkage disequilibrium with HLA susceptibility haplotypes to T1D. We evaluated the association of TNF rs1800629 with T1D in a cohort of Brazilian subjects, and assessed the impact of HLA susceptibility haplotypes in this association. 659 subjects with T1D and 539 control subjects were genotyped for TNF-308G>A variant. HLA-DRB1 and HIA-DQB1 genes were genotyped in a subset of 313 subjects with T1D and 139 control subjects. Associations with T1D were observed for the A-allele of rs1800629 (OR 1.69,95% Cl 133-2.15, p < 0.0001, in a codominant model) and for 3 HLA haplotypes: DRB1*03:01-DQB1*02:01 (OR 5.37, 95% Cl 3.23-8.59, p < 0.0001), DRB1*04:01-DQB1*03:02 (OR 2.95, 95% Cl 1.21-7.21, p = 0.01) and DRB1*04:02-DQB1*03:02 (OR 2.14,95% Cl 1.02-4.50, p = 0.04). Linkage disequilibrium was observed between TNF rs1800629 and HLA-DRB1 and HLA-DQB1 alleles. In a stepwise regression analysis HLA haplotypes, but not TNF rs1800629, remained independently associated with T1D. Our results do not support an independent effect of allelic variations of TNF in the genetic susceptibility to T1D|
|Subject:||Polimorfismo de nucleotídeo único|
Diabetes Mellitus tipo 1A
|Appears in Collections:||FCM - Artigos e Outros Documentos|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.