After Surgically Induced Remission, Ileal and Colonic Mucosa-Associated Microbiota Predicts Crohn's Disease RecurrenceOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
Researchers studied whether mucosa-associated microbiota, sampled after ileocolic resection for Crohn's disease, could predict later endoscopic recurrence. They analyzed neoterminal ileum, colon, and rectosigmoid biopsies from 262 patients across 6 academic centers.
How was it studied?
349 postoperative colonoscopies yielded 944 biopsies, profiled with 16S rRNA gene sequencing. Among 97 patients in confirmed remission at their first postoperative colonoscopy, the team compared microbiota in those who later developed recurrence versus those who stayed in remission, then tested a random forest model combining microbial and clinical features.
What did they find?
Patients who later recurred had lower ileal microbial diversity and depletion of the genus Anaerostipes, alongside increases in several Gammaproteobacteria genera, across all three biopsy sites. The family Ruminococcaceae, containing anti-inflammatory butyrate producers, was reduced both in active ileal inflammation and in remission samples that preceded recurrence. Microbiome plus clinical data predicted recurrence better than clinical features alone (AUC 79.5 percent versus 56.4 percent for neoterminal ileum; 83.1 percent versus 68 percent for rectosigmoid).
Why it matters
Microbial shifts appear before visible inflammation returns, suggesting the gut microbiome could serve as an early warning biomarker after Crohn's surgery. The findings point to Anaerostipes depletion and Gammaproteobacteria expansion as plausible targets for microbial modulation to prevent recurrence.