Fecal microbiota in pouchitis and ulcerative colitis

Area of Science:

• Gastroenterology
• Microbiology
• Genomics

Background:

• Ulcerative colitis (UC) is a chronic inflammatory bowel disease.
• Pouchitis is a complication following ileal pouch-anal anastomosis (IPAA) surgery in UC patients.
• Alterations in fecal microbiota are implicated in the pathogenesis of UC and pouchitis.

Purpose of the Study:

• To investigate changes in fecal microbiota composition in patients with UC and pouchitis.
• To compare the microbiota of UC and pouchitis patients with healthy controls.
• To identify specific microbial signatures associated with disease activity.

Main Methods:

• DNA extraction from fecal samples.
• 16S rRNA gene V3 region amplification using touchdown polymerase chain reaction.
• Denaturing gradient gel electrophoresis for amplicon separation.
• Digital analysis of band profiles and similarity indices.
• Sequencing of 16S rRNA gene to confirm predominant microbiota.

Main Results:

• Significantly lower microbial biodiversity in UC and pouchitis groups compared to healthy controls (P < 0.001).
• Distinct changes in predominant microbiota in UC patients with moderate to severe disease activity.
• Reduced abundance of dominant microbiota in pouchitis patients, negatively correlated with UC disease activity (r = -6.591, P < 0.01).
• Decreased levels of *Faecalibacterium prausnitzii* and *Eubacterium rectale* in UC patients.
• Altered and less diverse microbiota in pouchitis patients compared to UC patients.
• *Clostridium perfringens* was found in both UC and pouchitis patients.

Conclusions:

• Patients with UC and pouchitis exhibit reduced fecal microbiota diversity.
• Increased presence of *Clostridium perfringens* in feces suggests a role in the exacerbation of UC and pouchitis.