Nutrient competition predicts gut microbiome restructuring under drug perturbations.

Area of Science:

• Microbiology
• Systems Biology
• Pharmacology

Background:

• Human gut commensal bacteria face stresses like therapeutic drugs.
• Predicting collateral effects of drugs on microbial communities is challenging.

Purpose of the Study:

• To systematically investigate community-level effects of drug perturbations on gut bacteria.
• To understand the role of nutrient competition in drug responses.

Main Methods:

• Screened stool-derived in vitro communities with 707 small molecules.
• Analyzed compositional and metabolomic responses across ~5,000 conditions.
• Utilized consumer-resource models to interpret results.

Main Results:

• Nutrient competition predictably impacted community composition and metabolism.
• Some species benefited from drug-induced competitor inhibition.
• Community changes were often reversible, but some effects were long-lasting.
• Drug resistance emergence was infrequent.

Conclusions:

• Quantitative understanding of microbial interactions, especially nutrient competition, can predict drug side effects.
• This knowledge can help mitigate unintended consequences of drug treatments on the gut microbiota.