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Related Concept Videos

Viruses with RNA Genomes01:29

Viruses with RNA Genomes

RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
Hepatitis01:25

Hepatitis

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. The...
Retrovirus Life Cycles01:10

Retrovirus Life Cycles

Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the retrovirus to...
Viral Hepatitis I: Introduction01:28

Viral Hepatitis I: Introduction

Viral hepatitis is an inflammatory condition of the liver caused by infection with hepatotropic viruses, most commonly hepatitis A, B, C, D, and E. Despite variations in structure and transmission, all viruses mentioned infect hepatocytes and provoke immune responses that can hinder liver function. Additionally, some non-hepatotropic viruses can also lead to hepatic inflammation.Hepatitis A VirusHepatitis A virus (HAV) is transmitted through the fecal–oral route, typically by ingestion of food...
Retroviruses02:33

Retroviruses

Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
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Inhibitors Of Virion Release

Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...

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Related Experiment Video

Updated: Jun 14, 2026

A Protocol for Analyzing Hepatitis C Virus Replication
13:04

A Protocol for Analyzing Hepatitis C Virus Replication

Published on: June 26, 2014

Hijacking hepatitis C viral replication with a non-coding replicative RNA.

Juliette Bitard1, Gaëlle Chognard, Estelle Dumas

  • 1UMR CNRS, IFR, Université Victor Segalen Bordeaux, France.

Antiviral Research
|April 13, 2010
PubMed
Summary

This study introduces a novel RNA-based strategy to target antiviral protein expression exclusively to virus-infected cells, enhancing efficacy and reducing side effects for RNA virus infections like Hepatitis C virus.

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09:35

Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle

Published on: February 1, 2017

Area of Science:

  • Virology
  • Molecular Biology
  • Antiviral Therapeutics

Background:

  • Current RNA virus treatments show limited efficacy and cause side effects.
  • Targeting antiviral proteins specifically to infected cells can improve outcomes.

Purpose of the Study:

  • To develop a novel strategy for targeted antiviral protein expression in virus-infected cells.
  • To leverage viral replication machinery for selective delivery of therapeutic agents.

Main Methods:

  • Designed a non-coding (-)RNA carrying binding structures for the viral replication complex and an antiviral gene sequence.
  • Utilized the viral replication complex to replicate (-)RNA into coding (+)RNA for antiviral protein expression.
  • Tested the approach in Hepatitis C virus (HCV) replicon-harboring cells (genotype 1b) and JFH-1 infected cells (genotype 2a).

Main Results:

  • The developed non-coding RNAs (nrRNAs) significantly reduced HCV genomic RNA and viral protein NS5A levels.
  • This targeted approach demonstrated effectiveness in both replicon-harboring and infected cells.
  • Observed a strong activation of interferon-stimulating genes, indicating an innate immune response.

Conclusions:

  • The novel RNA-based strategy effectively targets antiviral protein expression to HCV-infected cells.
  • This approach offers a promising new avenue for developing more efficient and safer antiviral therapies.
  • The mechanism involves hijacking the viral replication machinery for selective therapeutic protein production.