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Related Concept Videos

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...
Viral Recombination00:57

Viral Recombination

Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
Infectious Diseases and Their Occurrence01:28

Infectious Diseases and Their Occurrence

Infectious diseases appear in populations through various transmission patterns, influenced by pathogen characteristics, population immunity, environmental conditions, and social behavior. Understanding these patterns is essential for effective public health surveillance and intervention. These categories—sporadic, outbreak, epidemic, pandemic, and endemic—help frame the nature and scope of disease events.Sporadic diseases occur irregularly and infrequently, without a predictable temporal or...
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...
Human Virome01:26

Human Virome

The human body harbors a vast and diverse viral community known as the human virome. The virome includes bacteriophages that infect bacteria, and eukaryotic viruses that infect human cells. Transient dietary and environmental viruses also contribute to this dynamic ecosystem. Estimates suggest the human body may contain on the order of 10¹³ viral particles, though abundance varies widely by body site and detection method.Comprehensive characterization of the virome has become possible only with...
Viral Replication: Lysogenic Cycle01:16

Viral Replication: Lysogenic Cycle

The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects its...

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Pairwise Growth Competition Assay for Determining the Replication Fitness of Human Immunodeficiency Viruses
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Pairwise Growth Competition Assay for Determining the Replication Fitness of Human Immunodeficiency Viruses

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Viral population dynamics and virulence thresholds.

Karen Z Lancaster1, Julie K Pfeiffer

  • 1Department of Microbiology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9048, USA.

Current Opinion in Microbiology
|June 5, 2012
PubMed
Summary
This summary is machine-generated.

Understanding the virulence threshold in RNA viruses is key to predicting disease and designing therapies. Studying viral population dynamics, including quasispecies, offers insights into infection outcomes and pathogen emergence.

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Area of Science:

  • Virology
  • Evolutionary Biology
  • Infectious Disease

Background:

  • Viral factors and host barriers determine disease severity.
  • The concept of a 'virulence threshold' governs symptomatic versus asymptomatic infections.
  • RNA viruses, with their high mutation rates, are ideal models for studying population dynamics and evolution.

Purpose of the Study:

  • To explore the modulation of virulence thresholds in RNA viruses.
  • To understand how viral population dynamics influence disease outcomes.
  • To aid in the rational design of therapeutics and vaccines.

Main Methods:

  • Utilizing RNA viruses as replicons to study quasispecies evolutionary theory.
  • Applying short generation times and high mutation rates to test theoretical models.
  • Integrating multiple theoretical models with experimental data.

Main Results:

  • RNA viruses provide a robust system for investigating virulence thresholds.
  • Quasispecies evolutionary theory has significantly shaped the understanding of viral population dynamics.
  • Novel approaches are emerging to combine theory and data for predicting viral behavior.

Conclusions:

  • Modulating virulence thresholds offers potential for therapeutic and vaccine development.
  • Studying RNA virus population dynamics is crucial for predicting disease and pathogen emergence.
  • The integration of theoretical models and experimental data represents a new frontier in virology.