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Related Concept Videos

Hepatitis01:25

Hepatitis

37
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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Viruses with RNA Genomes01:29

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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...
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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...
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Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

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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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Replication in Eukaryotes

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Updated: Mar 30, 2026

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

John M Taylor1

  • 1Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111.

Cold Spring Harbor Perspectives in Medicine
|November 4, 2015
PubMed
Summary
This summary is machine-generated.

This review details hepatitis delta virus (HDV) replication, covering its genome, antigens, and assembly with hepatitis B virus (HBV) proteins. It explores historical discoveries and current challenges in understanding HDV.

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Area of Science:

  • Virology
  • Hepatitis Viruses
  • Molecular Biology

Background:

  • Hepatitis delta virus (HDV) is a unique RNA virus that requires hepatitis B virus (HBV) for its replication and propagation.
  • HDV infection can lead to severe liver disease, making its study crucial for public health.

Purpose of the Study:

  • To provide a comprehensive review of the key aspects of HDV reproduction.
  • To discuss the current understanding and remaining challenges in HDV research.

Main Methods:

  • Literature review and synthesis of existing research on HDV.
  • Analysis of virion structure, RNA genome, replication mechanisms, delta antigens, and virus assembly.

Main Results:

  • Detailed examination of HDV's RNA genome and its replication cycle.
  • Explanation of delta antigens' roles and the process of HDV assembly using HBV envelope proteins.
  • Historical perspective on HDV discovery and identification of unresolved scientific questions.

Conclusions:

  • HDV replication is intricately linked with HBV, presenting complex biological challenges.
  • Further research is needed to fully elucidate HDV's life cycle and develop effective interventions.