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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...
Viral Replication: Lytic Cycle01:20

Viral Replication: Lytic Cycle

Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...

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A Protocol for Analyzing Hepatitis C Virus Replication
13:04

A Protocol for Analyzing Hepatitis C Virus Replication

Published on: June 26, 2014

Hepatitis C virus RNA replication.

Volker Lohmann1

  • 1Department of Infectious Diseases, University of Heidelberg, Heidelberg, Germany. Volker_lohmann@med.uni-heidelberg.de

Current Topics in Microbiology and Immunology
|March 7, 2013
PubMed
Summary

Hepatitis C virus (HCV) RNA replication depends on nonstructural proteins and replication elements. These viral components induce membrane alterations, forming replication sites crucial for viral propagation.

Area of Science:

  • Virology
  • Molecular Biology
  • Cell Biology

Background:

  • Hepatitis C virus (HCV) is a positive-strand RNA virus.
  • Viral RNA replication is essential for the HCV life cycle.
  • Replication requires viral nonstructural proteins and genomic elements.

Purpose of the Study:

  • To summarize current knowledge on HCV RNA replication.
  • To detail the roles of viral and host factors in replication.
  • To explain the biogenesis of the membranous web and RNA synthesis.

Main Methods:

  • Structural studies
  • Biochemical analyses
  • Reverse genetic studies

Main Results:

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Last Updated: May 13, 2026

A Protocol for Analyzing Hepatitis C Virus Replication
13:04

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Published on: June 26, 2014

Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle
09:35

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

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  • HCV nonstructural proteins associate with endoplasmic reticulum membranes.
  • Membrane alterations form the 'membranous web,' hosting replication sites.
  • The RNA-dependent RNA polymerase NS5B is central to viral RNA synthesis.

    • Conclusions:

    • Viral and host factors, along with cis-acting elements, are critical for HCV RNA replication.
    • Understanding these components is key to deciphering viral propagation mechanisms.