DNA methyltransferases 1 and 3B are required for hepatitis C virus infection in cell culture

Virology. 2013 Jun 20;441(1):57-65. doi: 10.1016/j.virol.2013.03.005. Epub 2013 Mar 29.


DNA methyltransferases (DNMTs) are responsible for establishing and maintaining DNA methylation, which are dysregulated in hepatitis C virus (HCV)-associated hepatocellular carcinoma (HCC). In this report, using lentivirus-mediated shRNA interference technology, we identified DNMT1 and DNMT3B as host factors involved in HCV propagation. Our results demonstrated that down-regulation of DNMT1 or DNMT3B expression in Huh7.5.1 cells severely impaired cell culture-produced HCV (HCVcc) infection. Furthermore, knockdown of DNMT1 or DNMT3B did not affect HCV entry and internal ribosome entry site (IRES)-directed translation but did inhibit subgenomic replication. In contrast, knockdown of DNMT3A had no significant effect on HCV infection, entry, translation, or replication, which suggested that DNMT3A did not play a significant role in HCV life cycle. Moreover, we showed that DNMT inhibitors 5-Aza-C and 5-Aza-dC significantly suppressed HCVcc infection, viral RNA replication, and protein expression. These results suggest that DNMTs are critical for HCV replication and may represent potent targets for the treatment of HCV infection.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Line
  • DNA (Cytosine-5-)-Methyltransferase 1
  • DNA (Cytosine-5-)-Methyltransferases / genetics
  • DNA (Cytosine-5-)-Methyltransferases / metabolism*
  • Gene Knockdown Techniques
  • Hepacivirus / physiology*
  • Hepatocytes / virology
  • Host-Pathogen Interactions*
  • Humans
  • Virus Cultivation
  • Virus Replication*


  • DNA (Cytosine-5-)-Methyltransferase 1
  • DNA (Cytosine-5-)-Methyltransferases
  • DNA methyltransferase 3A
  • DNA methyltransferase 3B
  • DNMT1 protein, human