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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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Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
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Dengue virus RNA structure specialization facilitates host adaptation.

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Dengue virus adapts to mosquito or human cells by specializing RNA structures, impacting fitness. Duplication of these RNA structures enhances viral robustness during host switching.

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Area of Science:

  • Virology
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Many viruses, including dengue virus, cycle between insect and human hosts.
  • Understanding viral adaptation mechanisms to different hosts is crucial but poorly understood.
  • RNA virus adaptation involves complex evolutionary strategies.

Purpose of the Study:

  • To investigate the role of RNA structures in dengue virus adaptation to mosquito and human hosts.
  • To elucidate the mechanistic basis of viral host switching and adaptation.
  • To identify specific RNA elements involved in host specialization.

Main Methods:

  • Deep sequencing of dengue virus populations during host adaptation.
  • RNA structure analysis to identify changes in the viral genome.
  • Viral fitness evaluation in different host cells (mosquito and mammalian).
  • Functional studies using recombinant viruses with modified RNA structures.

Main Results:

  • Host specialization of RNA elements within the dengue virus 3' untranslated region (UTR) was identified.
  • Adaptation to specific hosts involved selection of distinct viral populations with mutations in a stem-loop structure.
  • Specialized RNA structures led to fitness costs in non-adapted hosts, constraining host switching.
  • Duplication of a key stem-loop structure in dengue and related viruses allows accommodation of host-specific beneficial mutations.

Conclusions:

  • RNA structure specialization drives dengue virus adaptation to distinct hosts.
  • RNA duplication provides evolutionary robustness, enabling viruses to navigate host transitions.
  • These findings offer new insights into RNA virus adaptation and evolution.