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- Title
Associations of tumour necrosis factor alpha promoter polymorphisms at position −308 and −238 with clinical characteristics of chronic hepatitis C.
- Authors
Dai, C-Y.; Chuang, W-L.; Lee, L-P.; Chen, S-C.; Hou, N-J.; Lin, Z-Y.; Hsieh, M-Y.; Wang, L-Y.; Chang, W-Y.; Yu, M-L.
- Abstract
The aim of this study was to investigate the association between G vs A transitions in the promoter region of the tumour necrosis factor (TNF) alpha at positions −308 (TNF308.2) and −238 (TNF238.2) and clinical features of chronic hepatitis C (CHC). These two promoter TNF-alpha variants were determined in 250 biopsy-proven CHC patients by polymerase chain reaction amplification, followed by the Restriction Fragment Length Polymorphism (RFLP) method. The distribution of −308 and −238 TNF-alpha promoter genotypes were TNF308.1/TNF308.1: 187 (74.8%), TNF308.1/TNF308.2: 57 (22.8%) and TNF308.2/TNF308.2: 6 (2.4%), respectively, and TNF238.1/TNF238.1: 247 (98.8%) and TNF238.1/TNF238.2: 3 (1.2%). The frequencies of the TNF308.2 and TNF238.2 promoter alleles were 13.8% and 0.6%. Increased TNF308.2 allele copy numbers were significantly associated with increased frequency of lower pretreatment hepatitis C virus (HCV) RNA levels (<800 000 IU/mL; P = 0.031) and severe fibrosis stage (F3-F4; P = 0.006) and higher mean fibrosis score ( P = 0.007). The higher cytokine production (with one or two TNF308.2 alleles) was correlated significantly with lower pretreatment HCV RNA levels with a lower mean HCV RNA level ( P = 0.024) and increased frequency of lower pretreatment HCV RNA levels (<800 000 IU/mL; P = 0.017). Stepwise logistic regression showed that higher fibrosis score and low HCV RNA levels were independently related to the TNF308.2 allele [odds ratio (95% CI): 1.385 (1.127–1.702) and 0.698 (0.488–0.990)]. We conclude that inheritance of the TNF-alpha promoter genotype at the position −308 appears to be associated with variability in severity of fibrosis and viral load in chronic HCV infection.
- Subjects
TUMOR necrosis factors; GROWTH factors; HEPATITIS C; CHRONIC diseases; PROMOTERS (Genetics); GENETIC polymorphisms; FIBROSIS
- Publication
Journal of Viral Hepatitis, 2006, Vol 13, Issue 11, p770
- ISSN
1352-0504
- Publication type
Article
- DOI
10.1111/j.1365-2893.2006.00767.x