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Culturing of a complex gut microbial community in mucin-hydrogel carriers reveals strain- and gene-associated spatial organization
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Culturing of a complex gut microbial community in mucin-hydrogel carriers reveals strain- and gene-associated spatial organization
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Journal Article
Culturing of a complex gut microbial community in mucin-hydrogel carriers reveals strain- and gene-associated spatial organization
2023
Overview
Microbial community function depends on both taxonomic composition and spatial organization. While composition of the human gut microbiome has been deeply characterized, less is known about the organization of microbes between regions such as lumen and mucosa and the microbial genes regulating this organization. Using a defined 117 strain community for which we generate high-quality genome assemblies, we model mucosa/lumen organization with in vitro cultures incorporating mucin hydrogel carriers as surfaces for bacterial attachment. Metagenomic tracking of carrier cultures reveals increased diversity and strain-specific spatial organization, with distinct strains enriched on carriers versus liquid supernatant, mirroring mucosa/lumen enrichment in vivo. A comprehensive search for microbial genes associated with this spatial organization identifies candidates with known adhesion-related functions, as well as novel links. These findings demonstrate that carrier cultures of defined communities effectively recapitulate fundamental aspects of gut spatial organization, enabling identification of key microbial strains and genes.
The organization of gut microbes in lumen and mucosa and the microbial genes regulating this organization remain poorly understood. Here, using in vitro cultures incorporating a complex gut microbial community in mucin-hydrogel carriers, the authors show greater richness and strain-specific spatial organization, enabling discovery of associated genes.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
