Metabolic cascades drive spatial prebiotic fermentation in a defined gut consortium

In an Oligo-Mouse-Microbiota (OMM12) in vitro consortium with spatial mucin structures, xylooligosaccharide (XOS) supplementation recapitulates in gnotobiotic mice spatio-temporal XOS processing.

• Why it matters: Dietary fiber deficiency is linked to mucus degradation and impaired intestinal homeostasis, but it has been hard to connect in vitro fiber-metabolism dynamics to in vivo outcomes without representative models.
• What they did: The team added spatial mucin structures to the defined OMM12 consortium and compared XOS-driven community changes across in vitro and gnotobiotic mouse settings using compositional, metabolic, and transcriptional readouts.
• The result: XOS rapidly established a stable community state in vitro and in vivo and formed functional guilds where Bifidobacterium animalis and Blautia coccoides partition xylose and arabinose catabolism, while Bacteroides caecimuris benefits from XOS degradation; along the colonic axis, a spatial XOS gradient is linked to Blautia coccoides’s xylose preference and longitudinal functional adaptations.

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