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Bacteroides

ABSTRACT: Bacteroides ovatus and Bacteroides xylanisolvens Sequencing and Assembly

PROVIDER: PRJNA484981 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR10138215_1.fastq.gz	Fastqsanger.gz
	SRR10138215_2.fastq.gz	Fastqsanger.gz
	SRR9592370_1.fastq.gz	Fastqsanger.gz
	SRR9592370_2.fastq.gz	Fastqsanger.gz

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RNA-seq of human gut Bacteroides xylanisolvens and Bacteroides ovatus isolates grown on mucin O-linked glycans compared to glucose

Project description:Purpose: Examining the transcriptome of human gut bacteria (Bacteroides xylanisolvens/Bacteroides ovatus) that grow on mucin O-linked glycans as a sole carbon source Methods: Strains were grown on 10 mg/ml mucin O-linked glycans (MOG) or 5 mg/ml glucose as a sole carbon source in vitro. Fold change was calculated as MOG over glucose. Once cells reached an optical density corresponding to mid-log phase growth, RNA was isolated and rRNA depleted. Samples were multiplexed for sequencing on the Illumina HiSeq platform at the University of Michigan Sequencing Core. Data was analyzed using Arraystar software (DNASTAR, Inc.) Genes with significant up- or down-regulation were determined by the following criteria: genes with an average fold-change >10-fold and biological replicates with a normalized expression level >1% of the overall average RPKM expression level. Results: We identified genes activated in response to mucin O-linked glycans from Bacteroides xylanisolvens/Bacteroides ovatus strains

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Project description:Bacteroides xylanisolvens overview

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Depolymerization of plant cell wall glycans by symbiotic human gut bacteria (Bacteroides ovatus)

Project description:Symbiotic bacteria inhabiting the distal human gut have evolved under intense pressure to utilize complex carbohydrates, predominantly plant cell wall glycans abundant in our diets. These substrates are recalcitrant to depolymerization by digestive enzymes encoded in the human genome, but are efficiently targeted by some of the ~103-104 bacterial species that inhabit this niche. These species augment our comparatively narrow carbohydrate digestive capacity by unlocking otherwise unusable sugars and fermenting them into host-absorbable forms, such as short-chain fatty acids. We used phenotype profiling, whole-genome transcriptional analysis and molecular genetic approaches to investigate complex glycan utilization by two fully sequenced and closely related human gut symbionts: Bacteroides thetaiotaomicron and Bacteroides ovatus. Together these species target all of the common glycosidic linkages found in the plant cell wall, as well as host polysaccharides, but each species exhibits a unique ‘glycan niche’: in vitro B. thetaiotaomicron targets plant cell wall pectins in addition to linkages contained in host N- and O-glycans; B. ovatus uniquely targets hemicellulosic polysaccharides along with several pectins, but is deficient in host glycan utilization. Bacteroides ovatus bacteria were grown either in vitro on defined complex glycan sources, or in vivo in the intestinal tract of gnotobiotic mice fed variable diets. Increased in vitro gene expression was used to indicate the genes required for metabolism of complex glycans and compared to in vivo transcriptional activity to determine expression in the mouse gut.

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