Evidence map›Paper›PMID 19781061›Full record

ArticleGenome biology2009

Comparative genome and phenotypic analysis of Clostridium difficile 027 strains provides insight into the evolution of a hypervirulent bacterium.

Richard A Stabler, Miao He, Lisa Dawson, Melissa Martin, Esmeralda Valiente, Craig Corton, Trevor D Lawley, Mohammed Sebaihia, Michael A Quail, Graham Rose and 6 more

Abstract readComparative Study
In one paragraph

Article in Genome biology, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 309 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
309citing papers in PubMed, 1 pooled it
–field-weighted citation impact
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

309 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Trial
  3. Article
  4. Article
  5. A programmed reset mechanism primesScience advances · 2026
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  8. bioRxiv : the preprint server for biology · 2026
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  9. Phylogenomic analysis of the collagen-like BclA proteins inApplied and environmental microbiology · 2026
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  10. CenIR, an essential BlaIR-family regulatory system inbioRxiv : the preprint server for biology · 2026
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  11. Journal of bacteriology · 2026
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  12. International journal of microbiology · 2026
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  15. Analysis of essential genes inJournal of bacteriology · 2025
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  16. Review
  17. Article
  18. bioRxiv : the preprint server for biology · 2025
    Article
  19. Phenotypic analysis of variousApplied and environmental microbiology · 2025
    Article
  20. Analysis of Essential Genes inbioRxiv : the preprint server for biology · 2025
    Article

249 more citing papers are in PubMed but not listed here.

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

16 authors.

Richard A StablerLondon School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK. Richard.Stabler@lshtm.ac.uk
Miao He
Lisa Dawson
Melissa Martin
Esmeralda Valiente
Craig Corton
Trevor D Lawley
Mohammed Sebaihia
Michael A Quail
Graham Rose
Dale N Gerding
Maryse Gibert
Michel R Popoff
Julian Parkhill
Gordon Dougan
Brendan W Wren

Funding

Medical Research Council G0300020Wellcome Trust
6 · The paper itself

Abstract

backgroundThe continued rise of Clostridium difficile infections worldwide has been accompanied by the rapid emergence of a highly virulent clone designated PCR-ribotype 027. To understand more about the evolution of this virulent clone, we made a three-way genomic and phenotypic comparison of an 'historic' non-epidemic 027 C. difficile (CD196), a recent epidemic and hypervirulent 027 (R20291) and a previously sequenced PCR-ribotype 012 strain (630).

resultsAlthough the genomes are highly conserved, the 027 genomes have 234 additional genes compared to 630, which may contribute to the distinct phenotypic differences we observe between these strains relating to motility, antibiotic resistance and toxicity. The epidemic 027 strain has five unique genetic regions, absent from both the non-epidemic 027 and strain 630, which include a novel phage island, a two component regulatory system and transcriptional regulators.

conclusionsA comparison of a series of 027 isolates showed that some of these genes appeared to have been gained by 027 strains over the past two decades. This study provides genetic markers for the identification of 027 strains and offers a unique opportunity to explain the recent emergence of a hypervirulent bacterium.

Indexed as

Evolution, Molecular3T3 CellsAnimalsBacterial ProteinsBacterial ToxinsCaco-2 CellsCell LineCell Line, TumorCell SurvivalChlorocebus aethiopsCHO CellsClostridioides difficileCricetinaeCricetulusGenes, BacterialGenome, BacterialBacterial ProteinsBacterial ToxinstoxB protein, Clostridium difficile

Identifiers

PMID19781061
PMCPMC2768977

What OpenQuestion holds

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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.