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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...
Viral Mutations00:36

Viral Mutations

A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...
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...
Hepatic Drug Excretion: Influencing Factors01:16

Hepatic Drug Excretion: Influencing Factors

The biliary system of the liver, crucial for bile secretion and drug excretion, comprises intrahepatic bile ducts that merge to form the common hepatic duct. This duct, carrying hepatic bile, combines with the cystic duct, draining the gallbladder and forming the common bile duct, which empties into the duodenum. Bile, produced by hepatic cells lining the bile canaliculi, is composed primarily of water, bile salts, pigments, electrolytes, and lesser amounts of cholesterol and fatty acids. Bile...
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...

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Updated: Jun 12, 2026

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

Published on: November 7, 2018

Coevolution and HBV drug resistance.

Yury Khudyakov1

  • 1Division of Viral Hepatitis, Centers for Disease Control and Prevention, Atlanta, GA, USA. yek0@CDC.gov

Antiviral Therapy
|June 3, 2010
PubMed
Summary

High mutation rates in Hepatitis B virus (HBV) contribute to antiviral drug resistance. Coevolutionary dynamics within the HBV population and with the host provide a fuller explanation for varied resistance patterns observed in patients.

Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • High mutation rates in Hepatitis B virus (HBV) are a known factor in the development of antiviral drug resistance.
  • Observed variations in drug resistance rates and types among patients are not fully explained by mutation rates alone.

Purpose of the Study:

  • To explore the role of coevolutionary dynamics in explaining variations in HBV antiviral drug resistance.
  • To propose a comprehensive framework for understanding HBV drug resistance incorporating coevolutionary factors.

Main Methods:

  • Analysis of coevolutionary interactions at individual genomic sites within the HBV genome.
  • Consideration of coevolution among viral variants and subpopulations.
  • Examination of coevolution between the intrahost HBV population and the host immune system.

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Analysis of HBV-Specific CD4 T-cell Responses and Identification of HLA-DR-Restricted CD4 T-Cell Epitopes Based on a Peptide Matrix

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

Published on: February 1, 2017

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Last Updated: Jun 12, 2026

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

Published on: November 7, 2018

Analysis of HBV-Specific CD4 T-cell Responses and Identification of HLA-DR-Restricted CD4 T-Cell Epitopes Based on a Peptide Matrix
10:37

Analysis of HBV-Specific CD4 T-cell Responses and Identification of HLA-DR-Restricted CD4 T-Cell Epitopes Based on a Peptide Matrix

Published on: October 20, 2021

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

Main Results:

  • Coevolutionary processes at multiple levels significantly influence the emergence and patterns of HBV drug resistance.
  • Interactions between viral genomic sites, subpopulations, and the host environment are critical determinants of resistance.

Conclusions:

  • A coevolutionary perspective provides a more complete understanding of antiviral drug resistance in Hepatitis B virus.
  • Incorporating coevolutionary dynamics is essential for predicting and managing HBV drug resistance in clinical settings.