A combination of human leukocyte antigen DQB1*02 and the tumor necrosis factor α promoter G308A polymorphism predisposes to an insulin-deficient phenotype in patients with type 2 diabetes

被引:28
作者
Li, HY [1 ]
Groop, L
Nilsson, A
Weng, JP
Tuomi, T
机构
[1] Lund Univ, Wallenberg Lab, Dept Endocrinol, S-20502 Malmo, Sweden
[2] Lund Univ, Diabet & Endocrine Res Lab, S-20502 Malmo, Sweden
[3] Sun Yat Sen Univ, Dept Endocrinol, Univ Hosp 1, Guangzhou 510080, Peoples R China
[4] Univ Helsinki, Cent Hosp, Dept Internal Med, FIN-00029 Helsinki, Finland
关键词
D O I
10.1210/jc.2002-020506
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Our previous results have suggested that genes outside the human leukocyte antigen (HLA) class II locus may affect the phenotype of type 2 diabetic patients from families with both type 1 and type 2 diabetes ( mixed type 1/2). To study whether the TNFalpha gene could be such a modifying gene, we studied TNFalpha promoter polymorphisms (G-->A substitution at positions -308 and -238) in relation to HLA-DQB1 genotypes in type 2 patients from mixed type 1/2 families or common type 2 diabetes families as well as in patients with adult-onset type 1 diabetes and control subjects. The TNFalpha(308) AA/AG genotype frequency was increased in adult onset type 1 patients (55%, 69 of 126), but it was similar in type 2 patients from type 1/2 families (35%, 33/93) or common type 2 families (31%, 122 of 395), compared with controls (33%, 95/284; P<0.0001 vs. type 1). The TNF alpha(308) A and DQB1*02 alleles were in linkage disequilibrium in type 1 patients (Ds=0.81; P<0.001 vs. Ds=0.25 in controls) and type 2 patients from type 1/2 families (Ds=0.59, P<0.05 vs. controls) but not in common type 2 patients (Ds=0.39). The polymorphism was associated with an insulin-deficient phenotype in the type 2 patients from type 1/2 families only together with DQB*02, whereas the common type 2 patients with AA/AG had lower waist to hip ratio [0.92 (0.12) vs. 0.94 (0.11), P=0.008] and lower fasting C-peptide concentration [0.48 (0.47) vs. 0.62 (0.46) nmol/liter, P=0.020] than those with GG, independently of the presence of DQB1*02. In conclusion, TNF alpha is unlikely to be the second gene in the HLA area responsible for our previous findings in type 1/2 patients. However, we could show an association between TNF alpha(308) polymorphism and the phenotype of common type 2 diabetes.
引用
收藏
页码:2767 / 2774
页数:8
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