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Related Experiment Videos

Structural constraints on RNA virus evolution.

P Simmonds1, D B Smith

  • 1Department of Medical Microbiology, University of Edinburgh, Edinburgh EH8 9AG, United Kingdom. Peter.Simmonds@ed.ac.uk

Journal of Virology
|June 11, 1999
PubMed
Summary
This summary is machine-generated.

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Hepatitis G virus (HGV) RNA secondary structures limit sequence changes, impacting evolutionary rate estimates. This finding challenges the molecular clock assumption for viruses like HGV/GBV-C.

Area of Science:

  • Virology
  • Molecular Evolution
  • Genomics

Background:

  • Hepatitis G virus (HGV), also known as GB virus C (GBV-C), is prevalent in human populations.
  • Homologous viruses are found in various primate species, suggesting co-evolution with hosts.
  • Observed sequence similarity is inconsistent with the rapid mutation rate of HGV/GBV-C.

Purpose of the Study:

  • To investigate if RNA secondary structure formation constrains sequence variability in HGV/GBV-C.
  • To identify covariant sites associated with potential structural elements in the viral genome.

Main Methods:

  • Comparative analysis of complete coding sequences (8,500 bases) from different HGV/GBV-C genotypes.
  • Development of an algorithm to detect covariant sites and their spatial association with potential stem-loop structures.

Related Experiment Videos

  • Correlation analysis between identified structural sites and regions of reduced synonymous variability.

    • Main Results:

    • An excess of invariant synonymous sites (23%) was observed in HGV/GBV-C, significantly higher than expected by chance (10%).
    • At least 35 covariant sites linked to potential stem-loop structures were identified.
    • These structurally constrained sites correlated with genomic regions showing reduced synonymous variability.

    Conclusions:

    • RNA secondary-structure formation acts as a mechanism restricting sequence variability at specific sites in HGV/GBV-C.
    • This structural constraint leads to differential rates of nucleotide substitution, creating a disparity between short- and long-term evolutionary rates.
    • The findings violate molecular clock assumptions, limiting the use of sequence comparisons for divergence time estimations in structurally constrained viruses.