Viral genotype-specific role of PNPLA3, PPARG, MTTP, and IL28B in hepatitis C virus-associated steatosis

详细信息    查看全文

• 作者：Tao Cai¹ ; ² ; Jean-Franç ; ois Dufour³ ; Beat Muellhaupt⁴ ; Tilman Gerlach⁵ ; Markus Heim⁶ ; Darius Moradpour⁷ ; Andreas Cerny⁸ ; Raffaele Malinverni⁹ ; Vincent Kaddai¹⁰ ; Murielle Bochud¹¹ ; Francesco Negro¹⁰ ; ¹² ; ^† ; ; ^{Francesco.Negro@hcuge.ch"" rel=""nofollow} ; Pierre-Yves Bochud¹ ; ² ; ^† ; ; on behalf of the Swiss Hepatitis C Cohort Study Group
• 关键词：Hepatitis C ; Steatosis ; Genome-wide association study
• 刊名：Journal of Hepatology
• 出版年：2011
• 出版时间：September 2011
• 年：2011
• 卷：55
• 期：3
• 页码：529-535
• 全文大小：622 K

文摘

Background & Aims

Steatosis is a prominent feature of hepatitis C, especially in patients infected with genotype 3. The analysis of genetic polymorphisms influencing steatosis in chronic hepatitis C has been limited by the studies’ small sample size, and important single nucleotide polymorphisms (SNPs), such as those in the patatin-like phospholipase family 3 protein (PNPLA3), were never evaluated.

Methods

We analyzed the role of SNPs, from 19 systematically selected candidate genes, on steatosis in 626 Caucasian hepatitis C virus (HCV) infected patients. SNPs were extracted from a genome-wide association-generated dataset. Associations of alleles with the presence and/or different severity of steatosis were evaluated by univariate and multivariate logistic regression, accounting for all relevant covariates.

Results

The risk of steatosis was increased by carriage of I148 M in PNPLA3, but only in patients with HCV genotypes non-3 (odds ratio [OR] = 1.9, 95 % confidence interval [CI] = 1.6–2.3, p <0.001) and similar, albeit weaker associations were found for SNPs in peroxisome proliferator-activated receptor-γ (PPARG) and interleukin-28B (IL28B). Carriage of a SNP in the microsomal triglyceride transfer protein (MTTP) increased the risk of steatosis, but only in patients with HCV genotype 3 (rs1800803, OR = 3.4, 95 % CI = 2.4–4.9, p = 0.001).

Conclusions

The rs738409 SNP in PNPLA3 is associated with an increased risk of steatosis in patients infected with HCV genotypes non-3. Host genes affect steatosis depending on the infecting HCV genotype, suggesting their interaction with viral factors.