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Summary
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Viral evolutionary rates depend on measurement timescale, not just virus type. This study reveals a universal rate decay, enabling accurate dating of viral evolution and reconciling ancient and modern viral data.

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Area of Science:

  • Viral Evolutionary Biology
  • Molecular Evolution
  • Phylogenetics

Background:

  • Traditionally, viruses are categorized as slow-evolving DNA or fast-evolving RNA viruses.
  • Recent data suggest viral evolutionary rates may be timescale-dependent and the DNA/RNA division less distinct.

Purpose of the Study:

  • To investigate the relationship between viral evolutionary rates and measurement timescales.
  • To determine if rate decay dynamics differ across viral types.
  • To refine estimates of viral evolutionary timescales.

Main Methods:

  • Collected 396 viral evolutionary rate estimates across diverse viral genome types and replication strategies.
  • Analyzed rate dynamics and time-dependency across viral taxonomy.
  • Developed a model accounting for rate decay to reestimate evolutionary timescales.

Main Results:

  • Viral evolutionary rate estimates decay with measurement timescale across multiple taxonomic levels.
  • Rate decay speed is consistent across different viral types, irrespective of their biology.
  • Adjusting for rate decay clarifies distinctions between DNA, RNA, and reverse-transcribing viruses.
  • Reestimated lentivirus evolutionary timescales suggest they are millions of years old, aligning with paleovirological evidence.

Conclusions:

  • Viral evolutionary rates are demonstrably time-dependent.
  • A universal rate decay model can improve molecular clock accuracy.
  • This approach reconciles molecular and paleovirological estimates of viral ages.
  • The findings provide a new framework for understanding viral evolution and timescales.