in the Human Gut: Dynamics and Ecological Roles in Health and Disease.

The human gut microbiota plays a crucial role in maintaining host health. Our review explores the prevalence and dynamics of , a bacterial family within the Proteobacteria phylum, in the human gut which represents a small fraction of the gut microbiota in healthy conditions. Even though their roles are not yet fully understood, and especially () play a part in creating an anaerobic environment, producing vitamins and protecting against pathogenic infections.

Design and validation of a dual-fluorescence reporter system to monitor bacterial gene expression in the gut environment.

Fluorescence-based reporter systems are valuable tools for studying gene expression dynamics in living cells. However, available strategies to follow gene expression in bacteria within their natural ecosystem that can be typically rich and complex are scarce. In this work, we designed a plasmid-based tool ensuring both the identification of a strain of interest in complex environments and the monitoring of gene expression through the combination of two distinct fluorescent proteins as reporter genes.

Diversity of ethanolamine utilization by human commensal Escherichiacoli.

Ethanolamine (EA) is a substrate naturally present in the human gut and its catabolism by bacteria relies on the presence of eut genes encoding specific metabolic enzymes and accessory proteins. To date, EA utilization has been mostly investigated in gut bacterial pathogens. The aim of this study was to evaluate the ability of human gut commensal Escherichia coli isolates to utilize EA as a nitrogen and/or carbon sources.