PreprintCited by 73Bacteriophages and microbial interactionsRNA and protein synthesis mechanismsGenomics and Phylogenetic Studies

Viroid-like colonists of human microbiomes

Open access
Zheludev, Ivan N., Edgar, Robert C., Lopez-Galiano, Maria Jose, de la Peña, Marcos, Babaian, Artem, Bhatt, Ami S., Fire, Andrew Z.·2024·Cell

Preprint — published as 10.1016/j.cell.2024.09.033 · Paper page

Abstract

Here, we describe the “Obelisks,” a previously unrecognised class of viroid-like elements that we first identified in human gut metatranscriptomic data. “Obelisks” share several properties: (i) apparently circular RNA ∼1kb genome assemblies, (ii) predicted rod-like secondary structures encompassing the entire genome, and (iii) open reading frames coding for a novel protein superfamily, which we call the “Oblins”. We find that Obelisks form their own distinct phylogenetic group with no detectable sequence or structural similarity to known biological agents. Further, Obelisks are prevalent in tested human microbiome metatranscriptomes with representatives detected in ∼7% of analysed stool metatranscriptomes (29/440) and in ∼50% of analysed oral metatranscriptomes (17/32). Obelisk compositions appear to differ between the anatomic sites and are capable of persisting in individuals, with continued presence over >300 days observed in one case. Large scale searches identified 29,959 Obelisks (clustered at 90% nucleotide identity), with examples from all seven continents and in diverse ecological niches. From this search, a subset of Obelisks are identified to code for Obelisk-specific variants of the hammerhead type-III self-cleaving ribozyme. Lastly, we identified one case of a bacterial species ( Streptococcus sanguinis ) in which a subset of defined laboratory strains harboured a specific Obelisk RNA population. As such, Obelisks comprise a class of diverse RNAs that have colonised, and gone unnoticed in, human, and global microbiomes.

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Authors
Zheludev, I. N., Edgar, R. C., Lopez-Galiano, M. J., de la Peña, M., Babaian, A., Bhatt, A. S., & Fire, A. Z.
Affiliations
  • Stanford University (US)
  • University of Toronto (CA)
  • Stanford Medicine (US)
Corresponding author
  • Zheludev, Ivan N.
  • Fire, Andrew Z.
Venue
Cell
Publisher
openRxiv
Published
2024-01-21
Volume
187
Issue
23
Pages
6521-6536.e18
ISSN
0092-8674 (ISSN-L)
OpenAlex
W4403959930
Cited by
73
References
125
Citations by year
2026: 21 · 2025: 27 · 2024: 24
FWCI
19.69
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • RiuNet (Universitat Politècnica de València) (publishedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, other-oa)
  • PubMed Central (submittedVersion, cc-by-nc)
  • Repository of Digital Objects for Teaching Research and Culture (University of Valencia) (submittedVersion, cc-by-nc)
Funders
  • Division of Intramural Research, National Institute of Allergy and Infectious Diseases (R01AI148623, R01AI143757)
  • American Welding Society
  • Allen Institute
  • Generalitat Valenciana (PROMETEO CIPROM/2022/21, CIPROM/2022/21)
  • Universitat de València
  • University of Toronto
  • University of British Columbia
  • National Institutes of Health
  • School of Medicine, Stanford University
  • Stand Up To Cancer
  • Canadian Institutes of Health Research (PTJ-496709)
  • National Institute of General Medical Sciences (R35GM130366)
  • National Institute of Allergy and Infectious Diseases (R01AI148623, R01AI143757, 3.1416)
Topics
  • Physical Sciences › Environmental Science › Ecology › Bacteriophages and microbial interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
Keywords
obelisks, human microbiome, Streptococcus sanguinis, RNA secondary structure, metatranscriptomics, oral microbiota, gut microbiota

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