The impact of IL28B genotype on the gene expression profile of patients with chronic hepatitis C treated with pegylated interferon alpha and ribavirin

Journal of Translational Medicine

Ancha Baranova¹  Arian Afendy²  Maria Stepanova²  Mike Estep²  Aybike Birerdinc¹  Zobair M Younossi² 

[1] Center for the Study of Genomics in Liver Diseases, School of Systems Biology, College of Science, George Mason University, Fairfax, VA, USA;Center for Liver Diseases and Department of Medicine, Inova Fairfax Hospital, Falls Church, VA, USA

关键词: HCV treatment;    chronic hepatitis C;    IRF2;    SOCS1;    IL28B;    Pathway Analysis;    Gene Expression;    HCV;   

Others  :  1206056
DOI  :  10.1186/1479-5876-10-25

 received in 2011-11-07, accepted in 2012-02-07,  发布年份 2012

【 摘 要 】

Background

Recent studies of CH-C patients have demonstrated a strong association between IL28B CC genotype and sustained virologic response (SVR) after PEG-IFN/RBV treatment. We aimed to assess whether IL28B alleles rs12979860 genotype influences gene expression in response to PEG-IFN/RBV in CH-C patients.

Methods

Clinical data and gene expression data were available for 56 patients treated with PEG-IFN/RBV. Whole blood was used to determine IL28B genotypes. Differential expression of 153 human genes was assessed for each treatment time point (Days: 0, 1, 7, 28, 56) and was correlated with IL28B genotype (IL28B C/C or non-C/C) over the course of the PEG-IFN/RBV treatment. Genes with statistically significant changes in their expression at each time point were used as an input for pathway analysis using KEGG Pathway Painter (KPP). Pathways were ranked based on number of gene involved separately per each study cohort.

Results

The most striking difference between the response patterns of patients with IL28B C/C and T* genotypes during treatment, across all pathways, is a sustained pattern of treatment-induced gene expression in patients carrying IL28B C/C. In the case of IL28B T* genotype, pre-activation of genes, the lack of sustained pattern of gene expression or a combination of both were observed. This observation could potentially provide an explanation for the lower rate of SVR observed in these patients. Additionally, when the lists of IL28B genotype-specific genes which were differentially expressed in patients without SVR were compared at their baseline, IRF2 and SOCS1 genes were down-regulated regardless of patients' IL28B genotype. Furthermore, our data suggest that CH-C patients who do not have the SOCS1 gene silenced have a better chance of achieving SVR. Our observations suggest that the action of SOCS1 is independent of IL28B genotype.

Conclusions

IL28B CC genotype patients with CH-C show a sustained treatment-induced gene expression profile which is not seen in non-CC genotype patients. Silencing of SOCS1 is a negative and independent predictor of SVR. These data may provide some mechanistic explanation for higher rate of SVR in IL28B CC patients who are treated with PEG-IFN/RBV.

【 授权许可】

   
2012 Younossi et al; licensee BioMed Central Ltd.

【 图 表 】

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