Publikationsdatenbank

A proofreading-impaired herpesvirus generates populations with quasispecies-like structure (2019)

Art

Zeitschriftenartikel / wissenschaftlicher Beitrag

Autoren

Trimpert, Jakob (WE 5)

Groenke, Nicole (WE 5)

Kunec, Dusan (WE 5)

Eschke, Kathrin

He, Shulin

McMahon, Dino P.

Osterrieder, Nikolaus (WE 5)

Quelle

Nature microbiology

Bandzählung: 4

Seiten: 2175 – 2183

ISSN: 2058-5276

Sprache

Englisch

Verweise

URL (Volltext): https://www.nature.com/articles/s41564-019-0547-x

DOI: 10.1038/s41564-019-0547-x

Pubmed: 31477893

Kontakt

Institut für Virologie

Robert-von-Ostertag-Str. 7-13
14163 Berlin
+49 30 838 51833
virologie@vetmed.fu-berlin.de

Abstract / Zusammenfassung

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.

Author Correction in: Nature microbiology. - 4, 2019, 11, Seite 2025 / doi: 10.1038/s41564-019-0598-z