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Related Concept Videos

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...
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...
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...
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...
Retrovirus Life Cycles01:10

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DNA Bacteriophages

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Related Experiment Video

Updated: Jul 17, 2026

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

Published on: February 1, 2017

Hepatitis B virus replication.

Juergen Beck1, Michael Nassal

  • 1Department of Internal Medicine II/Molecular Biology, University Hospital Freiburg, Hugstetter Street 55, D-79106 Freiburg, Germany.

World Journal of Gastroenterology
|January 9, 2007
PubMed
Summary

Hepadnaviruses like hepatitis B virus (HBV) use a unique RNA intermediate for replication. Cell-free systems now enable detailed biochemical analysis of this complex process, advancing our understanding of viral replication.

Area of Science:

  • Virology
  • Molecular Biology
  • Biochemistry

Background:

  • Hepadnaviruses, including human hepatitis B virus (HBV), replicate via reverse transcription of a pregenomic RNA (pgRNA).
  • Hepadnaviral replication initiation is complex, involving protein-priming, an RNA hairpin (epsilon), cellular chaperones, and intact nucleocapsids.

Purpose of the Study:

  • To review the current understanding of hepadnaviral genome replication.
  • To highlight new insights gained from cell-free systems that reconstitute active replication initiation complexes.

Main Methods:

  • Utilizing reconstituted cell-free systems with purified components for duck HBV (DHBV) replication initiation.
  • Analyzing the biochemistry of hepadnaviral replication at the molecular level.

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Detection of Low Copy Number Integrated Viral DNA Formed by In Vitro Hepatitis B Infection

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Last Updated: Jul 17, 2026

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

Published on: February 1, 2017

A Protocol for Analyzing Hepatitis C Virus Replication
13:04

A Protocol for Analyzing Hepatitis C Virus Replication

Published on: June 26, 2014

Detection of Low Copy Number Integrated Viral DNA Formed by In Vitro Hepatitis B Infection
11:14

Detection of Low Copy Number Integrated Viral DNA Formed by In Vitro Hepatitis B Infection

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Main Results:

  • Cell-free systems have enabled the analysis of hepadnaviral replication initiation biochemistry.
  • While structural data is limited, emerging information on the epsilon RNA element is promising.

Conclusions:

  • Cell-free systems provide a powerful tool for studying hepadnaviral replication mechanisms.
  • Integrating biophysics, biochemistry, and genetics is expected to resolve outstanding questions and aid drug development.