Biliary microbiota in disease-free, obstructive and post-drainage biliary tracts

Area of Science:

• Microbiology
• Gastroenterology
• Genomics

Background:

• Human physiological bile microbial populations remain largely uncharacterized.
• Current bile sampling methods are invasive and typically used for disease diagnosis.
• Bacterial infections post-biliary drainage are a clinical concern with poorly understood causes.

Purpose of the Study:

• To characterize the taxonomic composition of human bile microbiota.
• To investigate the impact of biliary drainage on bile microbiota.
• To explore the relationship between biliary drainage and antibiotic resistance.

Main Methods:

• Metagenomic sequence analysis of bile samples.
• Comparison of microbiota in disease-free individuals, obstructive biliary tracts, and post-drainage biliary tracts.
• Inclusion of liver donors as a control group.

Main Results:

• Abundant bacterial populations were found in healthy liver donor bile.
• Microbial composition was similar between disease-free and malignant obstructive biliary tracts.
• Biliary drainage led to decreased microbial diversity and increased antibiotic resistance genes.

Conclusions:

• Biliary drainage significantly alters bile microbiota composition.
• The altered microbiota becomes more aggressive and antibiotic-resistant.
• Findings provide fundamental insights into human bile microbiota and drainage-induced changes.