Microbial Disruptions in Inflammatory Bowel Disease: A Comparative Analysis

Area of Science:

• Gastroenterology
• Microbiology
• Immunology

Background:

• Inflammatory bowel disease (IBD) encompasses ulcerative colitis (UC) and Crohn's disease (CD).
• Gut microbiota dysbiosis is implicated in IBD pathogenesis.
• Understanding IBD-associated microbial alterations is crucial for diagnosis and treatment.

Purpose of the Study:

• To investigate the fecal microbiota composition in IBD patients.
• To compare gut microbiota characteristics across IBD subtypes and disease stages.
• To identify specific gut bacteria associated with IBD.

Main Methods:

• Fecal samples collected from 41 IBD patients (18 UC, 23 CD) and 20 healthy controls.
• 16S rRNA gene sequencing performed on fecal samples.
• Bioinformatics analysis used to characterize microbial communities.

Main Results:

• IBD patients exhibited significantly lower fecal microbiota abundance and diversity than controls.
• Reduced abundance of *Subdoligranulum*, *Ruminococcus*, *Anaerostipes*, and *Lachnospira* in IBD patients.
• Distinct microbial profiles observed in UC and CD patients, with specific increases in *Streptococcus* (UC) and *Lachnoclostridium*, *Fusobacterium* (CD).
• Significant alterations noted between active IBD and remission periods, with reduced *Roseburia*, *Coprococcus*, and *Ruminiclostridium* in active disease.

Conclusions:

• Intestinal microbiota imbalance is evident in IBD patients.
• Reduced abundance of *Roseburia*, *Coprococcus*, and *Ruminiclostridium* may correlate with active IBD.
• These findings highlight potential microbial biomarkers for IBD activity.