Hybrids of RNA viruses and viroid-like elements replicate in fungi.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
05 05 2023
05 05 2023
Historique:
received:
24
03
2023
accepted:
25
04
2023
medline:
8
5
2023
pubmed:
6
5
2023
entrez:
5
5
2023
Statut:
epublish
Résumé
Earth's life may have originated as self-replicating RNA, and it has been argued that RNA viruses and viroid-like elements are remnants of such pre-cellular RNA world. RNA viruses are defined by linear RNA genomes encoding an RNA-dependent RNA polymerase (RdRp), whereas viroid-like elements consist of small, single-stranded, circular RNA genomes that, in some cases, encode paired self-cleaving ribozymes. Here we show that the number of candidate viroid-like elements occurring in geographically and ecologically diverse niches is much higher than previously thought. We report that, amongst these circular genomes, fungal ambiviruses are viroid-like elements that undergo rolling circle replication and encode their own viral RdRp. Thus, ambiviruses are distinct infectious RNAs showing hybrid features of viroid-like RNAs and viruses. We also detected similar circular RNAs, containing active ribozymes and encoding RdRps, related to mitochondrial-like fungal viruses, highlighting fungi as an evolutionary hub for RNA viruses and viroid-like elements. Our findings point to a deep co-evolutionary history between RNA viruses and subviral elements and offer new perspectives in the origin and evolution of primordial infectious agents, and RNA life.
Identifiants
pubmed: 37147358
doi: 10.1038/s41467-023-38301-2
pii: 10.1038/s41467-023-38301-2
pmc: PMC10162972
doi:
Substances chimiques
RNA, Catalytic
0
RNA, Viral
0
RNA
63231-63-0
RNA-Dependent RNA Polymerase
EC 2.7.7.48
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
2591Informations de copyright
© 2023. The Author(s).
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