Evidence map›Paper›PMID 23549220›Full record

ArticleGut microbes

Nod1 and Nod2 signaling does not alter the composition of intestinal bacterial communities at homeostasis.

Susan J Robertson, Jun Yu Zhou, Kaoru Geddes, Stephen J Rubino, Joon Ho Cho, Stephen E Girardin, Dana J Philpott

Open access · bronzeAbstract read
In one paragraph

Article in Gut microbes. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 77 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
77citing papers in PubMed, 1 pooled it
7.5field-weighted citation impact, top 2% 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

77 citing papers in PubMed, 1 synthesis or guideline pooled it, 145 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. Article
  4. Article
  5. Pattern Recognition by NOD-Like Receptors.Advances in experimental medicine and biology · 2025
    Review
  6. NOD1: a metabolic modulator.Frontiers in endocrinology · 2024
    Review
  7. Article
  8. Review
  9. International journal of molecular sciences · 2023
    Review
  10. Article
  11. Article
  12. NOD-like Receptors-Emerging Links to Obesity and Associated Morbidities.International journal of molecular sciences · 2023
    Review
  13. Article
  14. Article
  15. Review
  16. Article
  17. Article
  18. Article
  19. Gut microbiota, NLR proteins, and intestinal homeostasis.The Journal of experimental medicine · 2020
    Review
  20. Article

17 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

7 authors at 1 institution in 1 country.

Susan J RobertsonDepartment of Immunology, University of Toronto, Toronto, ON, Canada. susan.robertson@utoronto.ca
Jun Yu Zhou
Kaoru Geddes
Stephen J Rubino
Joon Ho Cho
Stephen E Girardin
Dana J Philpott
University of Toronto · CA

Funding

Canadian Institutes of Health Research
6 · The paper itself

Abstract

Patients with inflammatory bowel diseases (IBD) harbour intestinal bacterial communities with altered composition compared with healthy counterparts; however, it is unknown whether changes in the microbiota are associated with genetic susceptibility of individuals for developing disease or instead reflect other changes in the intestinal environment related to the disease itself. Since deficiencies in the innate immune receptors Nod1 and Nod2 are linked to IBD, we tested the hypothesis that Nod-signaling alters intestinal immune profiles and subsequently alters bacterial community structure. We used qPCR to analyze expression patterns of selected immune mediators in the ileum and cecum of Nod-deficient mice compared with their Nod-sufficient littermates and assessed the relative abundance of major bacterial groups sampled from the ileum, cecum and colon. The Nod1-deficient ileum exhibited significantly lower expression of Nod2, Muc2, α- and β-defensins and keratinocyte-derived chemokine (KC), suggesting a weakened epithelial barrier compared with WT littermates; however, there were no significant differences in the relative abundance of targeted bacterial groups, indicating that Nod1-associated immune differences alone do not promote dysbiosis. Furthermore, Nod2-deficient mice did not display any changes in the expression of immune markers or bacterial communities. Shifts in bacterial communities that were observed in this study correlated with housing conditions and were independent of genotype. These findings emphasize the importance of using F2 littermate controls to minimize environmental sources of variation in microbial analyses, to establish baseline conditions for host-microbe homeostasis in Nod-deficient mice and to strengthen models for testing factors contributing to microbial dysbiosis associated with IBD.

Indexed as

BiotaHomeostasisSignal TransductionAnimalsBiomarkersFemaleGastrointestinal TractGene Expression ProfilingMaleMiceMice, Inbred C57BLMice, KnockoutNod1 Signaling Adaptor ProteinNod2 Signaling Adaptor ProteinReal-Time Polymerase Chain ReactionBiomarkersNod1 protein, mouseNod1 Signaling Adaptor ProteinNod2 protein, mouseNod2 Signaling Adaptor Proteingut bacterial communitieshomeostasisinflammationintestinal environmentNod-like receptors

Identifiers

PMID23549220
PMCPMC3669167
OpenAlexW2061664992

What OpenQuestion holds

Textmetadata
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.