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Bifidobacterium longum subsp. infantis

ABSTRACT: Bifidobacterium longum subsp. infantis Genome sequencing and assembly

PROVIDER: PRJNA732070 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR14625522_1.fastq.gz	Fastqsanger.gz
	SRR14625522_2.fastq.gz	Fastqsanger.gz
	SRR14625523_1.fastq.gz	Fastqsanger.gz
	SRR14625523_2.fastq.gz	Fastqsanger.gz

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Bifidobacterium longum subsp. infantis utilizes urea as a nitrogen source

Project description:Bifidobacterium longum subsp. infantis is a bacterial commensal that colonizes the breast-fed infant gut where it utilizes indigestible components delivered in human milk. Accordingly, human milk contains several non-protein nitrogenous molecules, including urea at high abundance. This project investigates the degree to which urea is utilized as a primary nitrogen source by Bifidobacterium longum subsp. infantis and incorporation of hydrolysis products into the expressed proteome.

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RNA sequencing of Bifidobacterium longum subsp. infantis in response to various substrates

Project description:The purpose of this project was to determine the whole transcriptome response of Bifidobacterium longum subsp. Infantis to pooled and individual human milk oligosaccharides (HMO) relative to lactose Bacterial isolates grown on lactose, pooled human milk oligosaccharides (HMO), lacto-N-tetraose (LNT), lacto-N-neotetraose (LNnT), 2âfucosyllactose (2âFL), 3-fucosyllactose (3FL), and 6âsialyllactose (6âSL). RNA was extracted and sequenced, in duplicate, on an Illumina HiSeq. Early, mid, and late timepoints in response to pooled HMO were additionally sequenced in duplicate.

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Project description:Bifidobacterium longum subsp. infantis (B. infantis) colonizes the infant gut microbiome with a 43-kb gene cluster that enables human milk oligosaccharide (HMO) utilization. Although there is relative genomic homogeneity in this regard, previous observations suggest that B. infantis strains may differ in their utilization phenotype. To test this hypothesis, a panel of B. infantis strains were evaluated for their ability to utilize pooled HMOs to yield differential phenotypes including biomass accumulation, HMO consumption glycoprofile, end-product secretion, and global transcriptomes. Two strains (ATCC 15697 and UMA301) efficiently consumed several HMO isomers/anomers that exhibit degrees of polymerization (DP) ³ 4. These same strains partially consumed the smaller DP HMOs including fucosyllactose and lactodifucotetraose isomers/anomers. In contrast, UMA299 efficiently utilized fucosylated small molecular weight HMOs (DP<4), and accumulated greater biomass on purified 2´FL with significantly higher 1,2-propanediol production. This study identifies several strain-dependent features in HMO utilization phenotypes that are consistent with metabolic variation within a bifidobacterial-dominated infant-gut microbiome.

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