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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...
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
Mutations in Microorganisms01:18

Mutations in Microorganisms

Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...
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.
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...
Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).

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Updated: Jun 27, 2026

Isolation of Fidelity Variants of RNA Viruses and Characterization of Virus Mutation Frequency
18:10

Isolation of Fidelity Variants of RNA Viruses and Characterization of Virus Mutation Frequency

Published on: June 16, 2011

Multistrain virus dynamics with mutations: a global analysis.

Patrick De Leenheer1, Sergei S Pilyugin

  • 1Department of Mathematics, University of Florida, Gainesville, FL 32611-8105, USA. deleenhe@math.ufl.edu

Mathematical Medicine and Biology : a Journal of the IMA
|November 19, 2008
PubMed
Summary
This summary is machine-generated.

This study shows that even with mutations, the fittest virus strain remains dominant within the host. Small genetic changes (mutations) do not destabilize the overall viral population dynamics.

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Last Updated: Jun 27, 2026

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Published on: June 16, 2011

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Area of Science:

  • Virology
  • Mathematical Biology
  • Epidemiology

Background:

  • Within-host virus dynamics are complex, involving multiple strains.
  • Understanding viral evolution and competition is crucial for disease control.

Purpose of the Study:

  • To analyze the stability of viral populations with multiple strains and mutation.
  • To determine if the fittest strain remains dominant under mutation pressure.

Main Methods:

  • Mathematical modeling of within-host virus dynamics.
  • Analysis of n >= 2 virus strains with mutation.
  • Application of Lyapunov functions and perturbation theory (Smith & Waltman, 1999).

Main Results:

  • A Lyapunov function confirms global stability for the fittest strain when no mutation occurs.
  • The fittest strain's steady state persists even with mutations.
  • Small concentrations of other strains may coexist, depending on mutation pathways.

Conclusions:

  • The fittest viral strain demonstrates robust dominance in within-host models, even with mutations.
  • Mutation does not inherently destabilize the viral population's equilibrium.
  • These findings have implications for antiviral strategies and understanding viral evolution.