Cited by 237Genomics and Phylogenetic StudiesGut microbiota and healthMicrobial Community Ecology and Physiology

Large-Scale Analyses of Human Microbiomes Reveal Thousands of Small, Novel Genes

Open access
Sberro, Hila, Fremin, Brayon J., Zlitni, Soumaya, Edfors, Fredrik, Greenfield, Nicholas, Snyder, Michael P., Pavlopoulos, Georgios A., Kyrpides, Nikos C. +1 more·2019·Cell

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Abstract

Small proteins are traditionally overlooked due to computational and experimental difficulties in detecting them. To systematically identify small proteins, we carried out a comparative genomics study on 1,773 human-associated metagenomes from four different body sites. We describe >4,000 conserved protein families, the majority of which are novel; ∼30% of these protein families are predicted to be secreted or transmembrane. Over 90% of the small protein families have no known domain and almost half are not represented in reference genomes. We identify putative housekeeping, mammalian-specific, defense-related, and protein families that are likely to be horizontally transferred. We provide evidence of transcription and translation for a subset of these families. Our study suggests that small proteins are highly abundant and those of the human microbiome, in particular, may perform diverse functions that have not been previously reported.

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Crossref · 10.1016/j.cell.2019.07.016

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  • Growing experimental evidence in mycobacteria and other prokaryotes has shown that many sproteins are functional, requiring a rethinking of gene definitions.

    “However, growing experimental evidence in mycobacteria and other prokaryotes has shown that many sproteins are functional, requiring a rethinking of gene definitions (71–75).”

    From Mycobacterium smegmatis: The Vanguard of Mycobacterial Research (2023) · cites this paper as [73]

    The Introduction says recent studies have found functions for small proteins in prokaryotes, and the Discussion says accumulating evidence suggests roles in bacterial physiology. But this paper does not specifically discuss experimental evidence in mycobacteria or conclude that many small proteins are functionally established; it says mechanistic studies are still needed. Its account of overlooked small genes supports reconsidering annotation practices, but not an explicit call to rethink gene definitions. Page numbers are unavailable in our copy. (LLM, conf=0.85)

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Authors
Sberro, H., Fremin, B. J., Zlitni, S., Edfors, F., Greenfield, N., Snyder, M. P., Pavlopoulos, G. A., Kyrpides, N. C., & Bhatt, A. S.
Affiliations
  • Stanford Medicine (US)
  • Stanford University (US)
  • Joint Genome Institute (US)
  • Lawrence Berkeley National Laboratory (US)
Corresponding author
Bhatt, Ami S.
Venue
Cell
Publisher
Elsevier BV
Published
2019-08
Volume
178
Issue
5
Pages
1245-1259.e14
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2968334948
Cited by
237
References
102
Citations by year
2026: 22 · 2025: 30 · 2024: 30 · 2023: 29 · 2022: 31 · 2021: 42 · 2020: 44 · 2019: 9
FWCI
10.43
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
Funders
  • National Human Genome Research Institute (T32 HG000044)
  • National Institutes of Health (S100D023452, P30 CA124435)
  • U.S. Department of Energy (P30 CA124435)
  • National Cancer Institute (1R01AT01023201, K08 CA184420)
  • Stanford Cancer Institute
  • Damon Runyon Cancer Research Foundation
  • Office of Science (DE-AC02-05CH11231)
  • Stanford University
  • Stiftelsen Blanceflor Boncompagni Ludovisi, född Bildt
  • Pharmaceutical Research and Manufacturers of America Foundation
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Physical Sciences › Environmental Science › Ecology › Microbial Community Ecology and Physiology
Keywords
small proteins, human microbiome, metagenome, novel protein families, conserved protein families, secreted proteins, transmembrane proteins, horizontal gene transfer, host defense proteins
MeSH terms
Amino Acid Sequence, Cell Communication, Humans, Proteins, Ribosomal Proteins, Open Reading Frames, Sequence Alignment, Host-Pathogen Interactions, Metagenome, Microbiota

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