Evidence map›Paper›PMID 34348764›Full record

ArticleGenome biology2021

Host adaptation in gut Firmicutes is associated with sporulation loss and altered transmission cycle.

Hilary P Browne, Alexandre Almeida, Nitin Kumar, Kevin Vervier, Anne T Adoum, Elisa Viciani, Nicholas J R Dawson, Samuel C Forster, Claire Cormie, David Goulding and 1 more

Open access · goldAbstract read
In one paragraph

Article in Genome biology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 39 papers.

0numbers the graph read from it
0cells of the map it votes in
39citing papers in PubMed
5.1field-weighted citation impact, top 3% 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

39 citing papers in PubMed, 70 citations in OpenAlex.

  1. Trial
  2. Article
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  4. Article
  5. Evolutionary bioenergetics of sporulation.Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  6. Article
  7. International journal of molecular sciences · 2025
    Article
  8. Review
  9. Article
  10. Article
  11. Article
  12. Article
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  14. Uncovering newMicrobiology spectrum · 2024
    Article
  15. Pathogens (Basel, Switzerland) · 2024
    Review
  16. Article
  17. Article
  18. Genomics and physiology ofMicrobial genomics · 2024
    Article
  19. 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

11 authors at 1 institution in 2 countries.

Hilary P BrowneHost-Microbiota Interactions Laboratory, Wellcome Sanger Institute, Hinxton, UK. hb4@sanger.ac.uk.
Alexandre AlmeidaWellcome Sanger Institute, Hinxton, UK.
Nitin KumarHost-Microbiota Interactions Laboratory, Wellcome Sanger Institute, Hinxton, UK.
Kevin VervierHost-Microbiota Interactions Laboratory, Wellcome Sanger Institute, Hinxton, UK.
Anne T AdoumWellcome Sanger Institute, Hinxton, UK.
Elisa VicianiHost-Microbiota Interactions Laboratory, Wellcome Sanger Institute, Hinxton, UK.
Nicholas J R DawsonHost-Microbiota Interactions Laboratory, Wellcome Sanger Institute, Hinxton, UK.
Samuel C ForsterHost-Microbiota Interactions Laboratory, Wellcome Sanger Institute, Hinxton, UK.
Claire CormieWellcome Sanger Institute, Hinxton, UK.
David GouldingWellcome Sanger Institute, Hinxton, UK.
Trevor D LawleyHost-Microbiota Interactions Laboratory, Wellcome Sanger Institute, Hinxton, UK. tl2@sanger.ac.uk.
Wellcome Sanger Institute · GB

Funding

Wellcome Trust 098051
6 · The paper itself

Abstract

backgroundHuman-to-human transmission of symbiotic, anaerobic bacteria is a fundamental evolutionary adaptation essential for membership of the human gut microbiota. However, despite its importance, the genomic and biological adaptations underpinning symbiont transmission remain poorly understood. The Firmicutes are a dominant phylum within the intestinal microbiota that are capable of producing resistant endospores that maintain viability within the environment and germinate within the intestine to facilitate transmission. However, the impact of host transmission on the evolutionary and adaptive processes within the intestinal microbiota remains unknown.

resultsWe analyze 1358 genomes of Firmicutes bacteria derived from host and environment-associated habitats. Characterization of genomes as spore-forming based on the presence of sporulation-predictive genes reveals multiple losses of sporulation in many distinct lineages. Loss of sporulation in gut Firmicutes is associated with features of host-adaptation such as genome reduction and specialized metabolic capabilities. Consistent with these data, analysis of 9966 gut metagenomes from adults around the world demonstrates that bacteria now incapable of sporulation are more abundant within individuals but less prevalent in the human population compared to spore-forming bacteria.

conclusionsOur results suggest host adaptation in gut Firmicutes is an evolutionary trade-off between transmission range and colonization abundance. We reveal host transmission as an underappreciated process that shapes the evolution, assembly, and functions of gut Firmicutes.

Indexed as

Genome, BacterialAnaerobiosisBacillotaBiological EvolutionGastrointestinal MicrobiomeHost AdaptationHumansMetagenomeMicrobiotaSpores, BacterialSymbiosisBacterial transmissionGenome evolutionGenome reductionHost adaptationIntestinal microbiotaMetabolic specializationMetagenomicsMicrobiomeSporulation

Identifiers

PMID34348764
PMCPMC8340488
OpenAlexW3190393530

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.