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Topics in herpesvirus genomics and evolution.

Duncan J McGeoch1, Frazer J Rixon, Andrew J Davison

  • 1Medical Research Council Virology Unit, Institute of Virology, University of Glasgow, Church Street, Glasgow G11 5JR, UK. d.mcgeoch@vir.gla.ac.uk

Virus Research
|February 24, 2006
PubMed
Summary

Herpesviruses, extensively studied DNA viruses, show three distinct evolutionary groupings based on host. Capsid structure analysis suggests a common origin for all herpesviruses and even tailed DNA bacteriophages.

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Area of Science:

  • Virology
  • Evolutionary Biology
  • Genomics

Background:

  • Herpesviruses are a large, widespread group of DNA viruses infecting humans and other vertebrates.
  • Extensive genome sequencing has provided insights into viral functions and evolutionary relationships.

Purpose of the Study:

  • To construct a robust phylogenetic tree for mammalian herpesviruses.
  • To investigate the evolutionary relationships among different herpesvirus groupings.
  • To explore the common ancestry of herpesviruses and bacteriophages.

Main Methods:

  • Genome sequence analysis
  • Phylogenetic tree construction
  • Comparative analysis of capsid structures

Main Results:

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  • A robust phylogenetic tree for mammalian herpesviruses was constructed, revealing synchronous evolution with host lineages.
  • Three distinct herpesvirus groupings were identified based on natural hosts: mammals/birds/reptiles, amphibians/fish, and invertebrates.
  • Evidence suggests a common ancestor for the first two groups, with extremely remote relationships between the three.
  • Capsid structure analysis indicates a common origin for all three herpesvirus groups and a potential link to tailed DNA bacteriophages.

Conclusions:

  • Herpesvirus evolution is deeply intertwined with host lineage evolution.
  • Despite distinct groupings, all herpesviruses likely share a common ancestor, evidenced by capsid structure.
  • Herpesviruses may share a distant evolutionary origin with tailed DNA bacteriophages.