Evidence map›Paper›PMID 34468181›Full record

ArticleMicrobiology and molecular biology reviews : MMBR2021

Viruses Defined by the Position of the Virosphere within the Replicator Space.

Eugene V Koonin, Valerian V Dolja, Mart Krupovic, Jens H Kuhn

Open access · greenAbstract read
In one paragraph

Article in Microbiology and molecular biology reviews : MMBR, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 54 papers.

0numbers the graph read from it
0cells of the map it votes in
54citing papers in PubMed
13.1field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

54 citing papers in PubMed, 94 citations in OpenAlex.

  1. Why did some viruses evolve to be giants while others did not?Proceedings of the National Academy of Sciences of the United States of America · 2026
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  7. The Viruses ofViruses · 2025
    Article
  8. Article
  9. Article
  10. Human Riboviruses: A Comprehensive Study.Journal of molecular evolution · 2025
    Review
  11. Article
  12. Article
  13. Article
  14. Article
  15. Article
  16. Promotion of orderJournal of virology · 2024
    Article
  17. Article
  18. The polinton-like supergroup of viruses: evolution, molecular biology, and taxonomy.Microbiology and molecular biology reviews : MMBR · 2024
    Review
  19. Journal of virology · 2024
    Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 3 institutions in 2 countries.

Eugene V KooninNational Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, Maryland, USA.ORCID 0000-0003-3943-8299
Valerian V DoljaDepartment of Botany and Plant Pathology, Oregon State Universitygrid.4391.f, Corvallis, Oregon, USA.ORCID 0000-0002-8148-4670
Mart KrupovicArchaeal Virology Unit, Institut Pasteurgrid.428999.7, Paris, France.ORCID 0000-0001-5486-0098
Jens H KuhnIntegrated Research Facility at Fort Detrick, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Frederick, Maryland, USA.ORCID 0000-0002-7800-6045
National Institutes of Health · USInstitut Pasteur · FROregon State University · US

Funding

NIAID NIH HHS HHSN272201800013C
6 · The paper itself

Abstract

Originally, viruses were defined as miniscule infectious agents that passed through filters that retain even the smallest cells. Subsequently, viruses were considered obligate intracellular parasites whose reproduction depends on their cellular hosts for energy supply and molecular building blocks. However, these features are insufficient to unambiguously define viruses as they are broadly understood today. We outline possible approaches to define viruses and explore the boundaries of the virosphere within the virtual space of replicators and the relationships between viruses and other types of replicators. Regardless of how, exactly, viruses are defined, viruses clearly have evolved on many occasions from nonviral replicators, such as plasmids, by recruiting host proteins to become virion components. Conversely, other types of replicators have repeatedly evolved from viruses. Thus, the virosphere is a dynamic entity with extensive evolutionary traffic across its boundaries. We argue that the virosphere proper, here termed orthovirosphere, consists of a distinct variety of replicators that encode structural proteins encasing the replicators' genomes, thereby providing protection and facilitating transmission among hosts. Numerous and diverse replicators, such as virus-derived but capsidless RNA and DNA elements, or defective viruses occupy the zone surrounding the orthovirosphere in the virtual replicator space. We define this zone as the perivirosphere. Although intense debates on the nature of certain replicators that adorn the internal and external boundaries of the virosphere will likely continue, we present an operational definition of virus that recently has been accepted by the International Committee on Taxonomy of Viruses.

Indexed as

VirusesBiological EvolutionDNADNA VirusesPlasmidsDNAMGEmobile genetic elementorthovirosphereperivirospherereplicatorvirospherevirusvirus classificationvirus definitionvirus taxonomy

Identifiers

PMID34468181
PMCPMC8483706
OpenAlexW3197045863

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.