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Hepatitis01:25

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Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver.
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A Protocol for Analyzing Hepatitis C Virus Replication
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Hepatitis C virus RNA functionally sequesters miR-122.

Joseph M Luna1, Troels K H Scheel2, Tal Danino3

  • 1Laboratory of Virology and Infectious Disease, Center for the Study of Hepatitis C, The Rockefeller University, New York, NY 10065, USA; Laboratory of Molecular Neuro-Oncology and Howard Hughes Medical Institute, The Rockefeller University, New York, NY 10065, USA.

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|March 14, 2015
PubMed
Summary
This summary is machine-generated.

Hepatitis C virus (HCV) hijacks the liver-specific microRNA-122 (miR-122), reducing its availability for host targets. This sequestration by HCV RNA may promote long-term oncogenic potential by de-repressing host genes.

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Area of Science:

  • Virology
  • Molecular Biology
  • Hepatology

Background:

  • Hepatitis C virus (HCV) replication depends on the liver-specific microRNA-122 (miR-122).
  • The impact of HCV infection on endogenous microRNA (miRNA) targets within the host transcriptome remains largely unknown.

Purpose of the Study:

  • To investigate the global effects of HCV infection on host miRNA targets, particularly those regulated by miR-122.
  • To explore the mechanism by which HCV RNA interacts with miR-122 and its consequences on host gene expression.

Main Methods:

  • High-throughput sequencing and crosslinking immunoprecipitation (HITS-CLIP) to map Argonaute (AGO) binding sites on HCV RNA and the human transcriptome during infection.
  • Analysis of mRNA de-repression of miR-122 targets in HCV-infected cells.
  • Experimental manipulation of viral miRNA tropism by swapping miRNA binding sites.
  • Single-cell expression analysis using reporter systems containing miR-122 binding sites.
  • Development of a quantitative mathematical model for HCV-induced miR-122 sequestration.

Main Results:

  • HCV 5' untranslated region (UTR) showed robust AGO binding at miR-122 sites, indicating direct interaction.
  • HCV infection led to reduced AGO binding on endogenous miR-122 targets and significant mRNA de-repression.
  • Altering viral miRNA tropism shifted the sequestration effect from miR-122 to other miRNAs, like miR-15.
  • Single-cell data confirmed miR-122 target de-repression during HCV infection, correlating with expression levels and the number of miR-122 binding sites.

Conclusions:

  • HCV RNA acts as a molecular sponge, sequestering miR-122 and disrupting its normal function.
  • This sequestration leads to the de-repression of a broad range of host miR-122 targets.
  • The study proposes that this mechanism may contribute to the oncogenic potential of chronic HCV infection by creating a pro-oncogenic cellular environment.