A proofreading-impaired herpesvirus generates populations with quasispecies-like structure

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

2 Scopus Citations
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Author(s)

  • Jakob Trimpert
  • Nicole Groenke
  • Dusan Kunec
  • Kathrin Eschke
  • Shulin He
  • Dino P. McMahon

Detail(s)

Original languageEnglish
Pages (from-to)2175-2183
Journal / PublicationNature Microbiology
Volume4
Issue number12
Online published2 Sep 2019
Publication statusPublished - Dec 2019
Externally publishedYes

Abstract

RNA virus populations are composed of highly diverse individuals that form a cloud of related sequences commonly referred to as a ‘quasispecies’1–3. This diversity arises as a consequence of low-fidelity genome replication4,5. By contrast, DNA virus populations contain more uniform individuals with similar fitness6. Genome diversity is often correlated with increased fitness in RNA viruses, while DNA viruses are thought to require more faithful genome replication. During DNA replication, erroneously incorporated bases are removed by a 3′-5′ exonuclease, a highly conserved enzymatic function of replicative DNA but not RNA polymerases. This proofreading process enhances replication fidelity and ensures the genome integrity of DNA organisms, including large DNA viruses7. Here, we show that a herpesvirus can tolerate impaired exonucleolytic proofreading, resulting in DNA virus populations, which, as in RNA viruses8, are composed of highly diverse genotypes of variable individual fitness. This indicates that herpesvirus mutant diversity may compensate for individual fitness loss. Notably, in vivo infection with diverse virus populations results in a marked increase in virulence compared to genetically homogenous parental virus. While we cannot exclude that the increase in virulence is caused by selection of and/or interactions between individual genotypes, our findings are consistent with quasispecies dynamics. Our results contrast with traditional views of DNA virus replication and evolution, and indicate that a substantial increase in population diversity can lead to higher virulence.

Citation Format(s)

A proofreading-impaired herpesvirus generates populations with quasispecies-like structure. / Trimpert, Jakob; Groenke, Nicole; Kunec, Dusan; Eschke, Kathrin; He, Shulin; McMahon, Dino P.; Osterrieder, Nikolaus.

In: Nature Microbiology, Vol. 4, No. 12, 12.2019, p. 2175-2183.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal