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Viruses with RNA Genomes

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...

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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Viral Recombination

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Retroviruses

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Bacterial Artificial Chromosomes: A Functional Genomics Tool for the Study of Positive-strand RNA Viruses

Bacterial Artificial Chromosomes: A Functional Genomics Tool for the Study of Positive-strand RNA Viruses

Published on: December 29, 2015

Competition-colonization dynamics in an RNA virus.

Samuel Ojosnegros¹, Niko Beerenwinkel, Tibor Antal

¹Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid, Campus de Cantoblanco, 28049 Madrid, Spain.

Proceedings of the National Academy of Sciences of the United States of America

|January 19, 2010

Summary

This summary is machine-generated.

RNA viruses evolve diverse mutants that compete and colonize. Viral competition dynamics influence host cell killing, with competitors outcompeting colonizers during coinfection.

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Area of Science:

Virology
Evolutionary Biology
Ecology

Background:

RNA viruses rapidly produce diverse mutants during replication.
These viral mutants exhibit varying capacities for host cell killing.
Viral populations can exhibit complex ecological dynamics.

Purpose of the Study:

To investigate the evolutionary dynamics of RNA virus populations.
To explore the competition-colonization dynamics within viral mutant spectra.
To understand the evolution of viral virulence based on intra-population interactions.

Main Methods:

Passaging a single RNA viral genome through cell culture over hundreds of generations.
Analyzing the diversification into genetically distinct subpopulations.
Employing mathematical modeling to simulate coinfection dynamics.
Conducting experimental validation of model predictions.

Main Results:

Viral progeny diversified into two distinct subpopulations: competitors and colonizers.
Colonizers were more efficient at killing cells when alone.
In coinfection, viral interference reduced cell killing, and competitors replaced colonizers.
Selection was demonstrated to be density-dependent.

Conclusions:

Viral population dynamics are shaped by a trade-off between competition and colonization.
Intra-population interactions within viral quasispecies influence virulence evolution.
Ecological principles of competition and colonization apply to viral evolution.