Gut microbiota Turicibacter strains differentially modify bile acids and host lipids

Area of Science:

• Microbiology
• Gut Microbiome Research
• Host-Microbe Interactions

Background:

• Turicibacter bacteria are common in mammalian guts and linked to diet and body weight.
• The precise mechanisms by which Turicibacter influences host physiology remain unclear.

Purpose of the Study:

• To investigate the functional roles of Turicibacter isolates in bile acid metabolism.
• To identify specific genes responsible for Turicibacter-mediated alterations in host lipid metabolism.

Main Methods:

• Characterization of diverse mouse and human Turicibacter isolates.
• Analysis of bile acid transformations and bile salt hydrolase activity.
• Colonization experiments with gnotobiotic mice and engineered bacteria.

Main Results:

• Turicibacter isolates exhibit strain-specific bile acid modification capabilities.
• Colonization with Turicibacter alters host bile acid profiles in vivo.
• Expression of Turicibacter bile acid-modifying genes reduces host cholesterol, triglycerides, and adipose tissue.

Conclusions:

• Turicibacter strains possess genes enabling them to modify host bile acids.
• These modifications influence host lipid metabolism and fat biology.
• Turicibacter represents a significant modulator of host fat metabolism.