Variation of Gut Mucosal Microbiome With Anti-Saccharomyces cerevisiae Antibody Status in Pediatric Crohn Disease

Study information

Needs review

study design

case-control

Citation

PMID PubMed identifier for scientific articles.

31764438

DOI Digital object identifier for electronic documents.

10.1097/MPG.0000000000002461

URI Uniform resource identifier for web resources.

Authors

Kansal S, Catto-Smith AG, Boniface K, Thomas S, Cameron DJ, Oliver M, Alex G, Kirkwood CD, Wagner J

Journal

Journal of pediatric gastroenterology and nutrition

Year

2019

OBJECTIVES: Crohn disease (CD) is a chronic relapsing condition possibly caused by a dysbiotic microbiome. Approximately 30% to 60% of patients with CD have anti-Saccharomyces cerevisiae antibody (ASCA), but any association with gut microbiota is unexplored. We hypothesized that ASCA positivity would predict a signature microbial status and clinical phenotype. METHODS: Ileocolonic mucosal biopsies were obtained from children with CD (n = 135), and controls without inflammatory bowel disease (n = 45). Comparison was made between ASCA status, microbial diversity, and clinical characteristics. RESULTS: ASCA was highly specific but poorly sensitive for the diagnosis of CD. In patients with CD, ASCA positivity was associated with older age (≥10 years), ileocolonic disease, and long-term risk of surgery. Microbial alpha and beta diversity were similar in patients with CD with or without ASCA, but significantly less when compared to noninflammatory bowel disease controls. Microbial richness was similar across all 3 groups. Fourteen bacterial species were associated with ASCA-positive patients with CD and 14 species with ASCA-negative patients (P < 0.05). After using a false discovery rate correction Ruminococcus torques and bacterium Yersinia enterocolitica 61 remained significantly associated with CD ASCA positivity (P = 0.0178), whereas Enterobacter cloacae and Faecalibacterium prausnitzii were significantly associated with CD ASCA negativity (P = 0.0178 and 0.0342). CONCLUSION: ASCA-positive and ASCA-negative patients with CD have significant differences in gut microbiome composition, which could possibly be influencing the phenotype of the disease.

Experiment 1

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Curated date: 2021/01/10

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Subjects

Location of subjects: Australia

Host species Species from which microbiome was sampled (if applicable): Homo sapiens

Body site Anatomical site where microbial samples were extracted from according to the Uber Anatomy Ontology: Ileum Distal intestine,Intestinum ileum,Lower intestine,Posterior intestine,Ileum

Condition The experimental condition / phenotype studied according to the Experimental Factor Ontology: Crohn's disease Colitis, Granulomatous,CROHN DIS,Crohn Disease,Crohn disease,Crohn's associated gastritis,Crohn's disease,Crohn's disease of colon,Crohn's disease of large bowel,CROHNS DIS,Crohns Disease,Enteritis, Granulomatous,Enteritis, Regional,Gastritis Associated with Crohn Disease,Gastritis Associated with Crohn's Disease,granulomatous colitis,Ileitis, Regional,Ileitis, Terminal,Ileocolitis,pediatric Crohn's disease,regional enteritis,crohn disease

Group 0 name Corresponds to the control (unexposed) group for case-control studies: crohn disease ASCA negative patients
Group 1 name Corresponds to the case (exposed) group for case-control studies: crohn disease ASCA positive patients
Group 1 definition Diagnostic criteria applied to define the specific condition / phenotype represented in the case (exposed) group: Crohn disease anti-Saccharomyces cerevisiae antibody status
Group 0 sample size Number of subjects in the control (unexposed) group: 39
Group 1 sample size Number of subjects in the case (exposed) group: 38
Antibiotics exclusion Number of days without antibiotics usage (if applicable) and other antibiotics-related criteria used to exclude participants (if any): 3 months

Lab analysis

Sequencing type: 16S

16S variable region One or more hypervariable region(s) of the bacterial 16S gene: V2

Sequencing platform Manufacturer and experimental platform used for quantifying microbial abundance: Non-quantitative PCR

Statistical Analysis

Statistical test: Mann-Whitney (Wilcoxon)

Significance threshold p-value or FDR threshold used for differential abundance testing (if any): 0.05
MHT correction Have statistical tests be corrected for multiple hypothesis testing (MHT)?: Yes

Alpha Diversity

Shannon Estimator of species richness and species evenness: more weight on species richness: unchanged
Chao1 Abundance-based estimator of species richness: unchanged
Simpson Estimator of species richness and species evenness: more weight on species evenness: unchanged
Richness Number of species: unchanged

Signature 1

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Curated date: 2021/01/10

Curator: Rimsha Azhar

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Source: Figure 1

Description: Bacterial species significantly associated with Crohn disease Anti-Saccharomyces cerevisiae antibody status (ASCA) positive patients and CD ASCA-negative patients

Abundance in Group 1: increased abundance in crohn disease ASCA positive patients

NCBI	Links
[Ruminococcus] torques

Revision editor(s): WikiWorks

Signature 2

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Mark reviewed

Your review change was submitted

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Curated date: 2021/01/10

Curator: Rimsha Azhar

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Source: Figure 1

Description: Bacterial species significantly associated with Crohn disease Anti-Saccharomyces cerevisiae antibody status (ASCA) positive patients and CD ASCA-negative patients

Abundance in Group 1: decreased abundance in crohn disease ASCA positive patients

NCBI	Links
Enterobacter cloacae ⚠
Faecalibacterium prausnitzii

Revision editor(s): WikiWorks