Published online Jun 14, 2020. doi: 10.3748/wjg.v26.i22.3098
Peer-review started: January 6, 2020
First decision: January 19, 2020
Revised: March 30, 2020
Accepted: May 28, 2020
Article in press: May 28, 2020
Published online: June 14, 2020
Several studies have employed animal models to explore the association between microbiota and interleukin (IL) 10 signaling; however, limited information is available about the human microbiome.
To characterize the microbiome in patients with IL10RA mutations and to explore the association between gut dysbiosis and disease severity.
Fecal samples were collected from patients who were diagnosed with loss-of-function mutations in the IL10RA gene between January 2017 and July 2018 at the Children's Hospital of Fudan University. Age-matched volunteer children were recruited as healthy controls. Patients with Crohn's disease (CD) were used as disease controls to standardize the antibiotic exposure. Microbial DNA was extracted from the fecal samples. All analyses were based on the 16S rRNA gene sequencing data.
Seventeen patients with IL10RA mutations (IL10RA group), 17 patients with pediatric CD, and 26 healthy children were included. Both patients with IL10RA mutations and those with CD exhibited a reduced diversity of gut microbiome with increased variability. The relative abundance of Firmicutes was substantially increased in the IL10RA group (P = 0.02). On further comparison of the relative abundance of taxa between patients with IL10RA mutations and healthy children, 13 taxa showed significant differences. The IL10RA-specific dysbiosis indices exhibited a significant positive correlation with weighted pediatric CD activity index and simple endoscopic score for CD.
In patients with IL10RA mutations and early onset inflammatory bowel disease, gut dysbiosis shows a moderate association with disease severity.
Core tip: Understanding the role of microbes in sub-populations of inflammatory bowel disease patients is important. The focus on this relatively unique and uniform interleukin (IL)10RA group provides an excellent opportunity. In this study, clinical variables of IL10RA-deficient patients (such as disease course) were linked with changes in the stool microbiome, which implies potential clinical relevance of the changes in microbial populations.