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Inferring Metabolic Mechanisms of Interaction within a Defined Gut Microbiota

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September 10 2018
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Cell Syst. 2018 Sep 26;7(3):245-257.e7. doi: 10.1016/j.cels.2018.08.003. Epub 2018 Sep 5.

ABSTRACT

The diversity and number of species present within microbial communities create the potential for a multitude of interspecies metabolic interactions. Here, we develop, apply, and experimentally test a framework for inferring metabolic mechanisms associated with interspecies interactions. We perform pairwise growth and metabolome profiling of co-cultures of strains from a model mouse microbiota. We then apply our framework to dissect emergent metabolic behaviors that occur in co-culture. Based on one of the inferences from this framework, we identify and interrogate an amino acid cross-feeding interaction and validate that the proposed interaction leads to a growth benefit in vitro. Our results reveal the type and extent of emergent metabolic behavior in microbial communities composed of gut microbes. We focus on growth-modulating interactions, but the framework can be applied to interspecies interactions that modulate any phenotype of interest within microbial communities.

PMID:30195437 | PMC:PMC6166237 | DOI:10.1016/j.cels.2018.08.003

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