Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

B.thetaiotaomicron or B. longum mono-association versus B. thetaiotaomicron/B. longum co-colonization, PR chow, NMRI

ABSTRACT: Genome wide transcriptional comparison of B. thetaiotaomicron or B. longum mono-association vs. B. thetaiotaomicron bi-association with B. longum. Cecal populations from 10d colonizations with NMRI gnotobiotic mice fed a standard-chow polysaccharide rich (PR) diet (n=5 samples/group) were profiled. Total RNA was prepared from cecal contents of 10 day associated gnotobiotic mice and hybridized to B. thetaiotaomicron/B. longum GeneChips.

ORGANISM(S): Bifidobacterium longum

SUBMITTER: Christina Chen

PROVIDER: E-GEOD-5865 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Genomic and metabolic studies of the impact of probiotics on a model gut symbiont and host.

Sonnenburg Justin L JL Chen Christina T L CT Gordon Jeffrey I JI

PLoS biology 20061101 12

Probiotics are deliberately ingested preparations of live bacterial species that confer health benefits on the host. Many of these species are associated with the fermentation of dairy products. Despite their increasing use, the molecular details of the impact of various probiotic preparations on resident members of the gut microbiota and the host are generally lacking. To address this issue, we colonized germ-free mice with Bacteroides thetaiotaomicron, a prominent component of the adult human ...[more]

PMID: 17132046

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Project description:The adult human gut microbial community is typically dominated by two bacterial phyla (divisions), the Firmicutes and the Bacteroidetes. Little is known about the factors that govern the interactions between their members. Here we examine the niches of representatives of both phyla in vivo. Finished genome sequences were generated from E. rectale and E. eligens, which belong to Clostridium Cluster XIVa, one of the most common gut Firmicute clades. Comparison of these and 25 other gut Firmicutes and Bacteroidetes indicated that the former possess smaller genomes and a disproportionately smaller number of glycan-degrading enzymes. Germ-free mice were then colonized with E. rectale and/or a prominent human gut Bacteroidetes, Bacteroides thetaiotaomicron, followed by whole genome transcriptional profiling of both organisms in their distal gut (cecal) habitat as well as host responses, high resolution proteomic analysis of cecal contents, and biochemical assays of carbohydrate metabolism. B. thetaiotaomicron adapts to E. rectale by upregulating expression of a variety of polysaccharide utilization loci (PULs) encoding numerous glycoside hydrolase gene families, and by signaling the host to produce mucosal glycans that it, but not E. rectale, can access. E. rectale adapts to B. thetaiotaomicron by decreasing production of its glycan-degrading enzymes, increasing expression of selected amino acid and sugar transporters, and facilitating glycolysis by reducing levels of NADH, in part via generation of butyrate from acetate, which in turn is utilized by the gut epithelium. This simplified model of the human gut microbiota illustrates niche specialization and functional redundancy within members of major gut bacterial phyla, and the importance of host glycans as a nutrient foundation that ensures ecosystem stability. The interactions between E. rectale and B. thetaiotaomicron were characterized by performing whole genome transcriptional profiling of each species after colonization of gnotobiotic mice with each organism alone, or in combination. E. rectale was also profiled during in vitro growth.

Dataset Information

B.thetaiotaomicron or B. longum mono-association versus B. thetaiotaomicron/B. longum co-colonization, PR chow, NMRI

Publications

Genomic and metabolic studies of the impact of probiotics on a model gut symbiont and host.

Similar Datasets

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