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Quasispecies development by high frequency RNA recombination during MHV persistence

C L Rowe1, S C Baker, M J Nathan

  • 1Department of Microbiology and Immunology, Loyola University of Chicago, Stritch School of Medicine, Maywood, Illinois 60153, USA.

Advances in Experimental Medicine and Biology
|October 23, 1998
PubMed
Summary
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Persistent viral RNA populations, known as quasispecies, are linked to severe disease. This study found that complex viral quasispecies in mice with chronic paralysis correlate with specific RNA deletions, suggesting a role in pathogenesis.

Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • Infectious viruses, particularly persisting viral RNAs, often exist as diverse populations termed "quasispecies".
  • Understanding the role of viral quasispecies in pathogenesis is crucial for developing effective treatments.

Purpose of the Study:

  • To characterize viral quasispecies populations during persistent mouse hepatitis virus (MHV) infection.
  • To investigate the association between viral quasispecies complexity and MHV-induced pathogenesis.

Main Methods:

  • Analysis of persisting viral RNA populations using reverse-transcription polymerase chain reaction (RT-PCR) of the spike gene's S1 region.
  • Differential colony hybridization to identify spike deletion variants (SDVs).
  • Sequence analysis of SDVs and mapping to predicted RNA secondary structures.

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Main Results:

  • Mice exhibiting the most severe chronic paralysis harbored the most complex viral quasispecies.
  • A frequently deleted structural motif in the spike RNA was identified as an isolated stem loop structure.
  • High-frequency recombination at sites of RNA secondary structure appears to drive viral quasispecies expansion.

Conclusions:

  • Viral quasispecies complexity is associated with the severity of persistent MHV infection.
  • Specific RNA secondary structures may serve as recombination hotspots, contributing to viral evolution and pathogenesis.
  • These findings provide insights into the mechanisms underlying persistent viral infections and disease progression.