Abstract
Hepatitis B virus (HBV) and hepatitis C virus (HCV) infection were known to be risk factors for HCC, they were suspected to promote its development by eliciting epigenetic changes. However, the precise gene targets and underlying mechanisms have not been elucidated. Epigenetic regulation of gene expression has emerged as a fundamental aspect of cancer development and progression. The molecular mechanisms of carcinogenesis in hepatocellular carcinoma involve a complex interplay of both genetic and epigenetic factors. DNA methylation, post-translational modifications of histone proteins, chromatin remodeling, and noncoding RNAs are four major types of mechanistic layers in the field of epigenetics. HBV infection could affect methylation on p16INK4A, GSTP1, CDH1(E-cadherin), RASSF1A, p21WAF1/CIP1 genes, which may play important roles in the development of HCC. HCV infection was related to aberrant methylation on SOCS-1, Gadd45β, MGMT, STAT1 and APC. Other epigenetic alterations included histone proteins, chromatin remodeling, and noncoding RNAs were described in literature. Uncovering the epigenetic alterations of HBV/HCV-induced HCC carcinogenesis could highlight a new strategy for deciphering the mechanism of HCC tumorigenesis and development, as well as a potential diagnostic advantage.
Keywords: Epigenetic, hepatocellular carcinoma, HBV, HCV, DNA methylation and histone modification.
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