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Sialylated milk oligosaccharides impact bone growth

ABSTRACT: Mechanisms by which sialylated milk oligosaccharides impact bone growth in a gnotobiotic mouse model of infant undernutrition

PROVIDER: PRJEB29697 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	CAAKNQ01.dat.gz	Other
	CAAKNQ01.fasta.gz	Fasta.gz
	CAAKNQ01.master.dat	Other
	CAAKNR01.dat.gz	Other

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Fecal metatranscriptomics from healthy adults before and after supplementation with bovine milk oligosaccharides

Project description:Complex oligosaccharides found in human milk play a vital role in gut microbiome development for the human infant. Bovine milk oligosaccharides (BMO) have similar structures with those derived from human milk, but have not been well studied for their effects on the healthy adult human gut microbiome. Healthy human subjects consumed BMO over two-week periods at two different doses and provided fecal samples. Metatranscriptomics of fecal samples was conducted to determine microbial and host gene expression in response to the supplement. Fecal samples were also analyzed by mass spectrometry to determine levels of undigested BMO. No changes were observed in microbiome activity across all participants. Repeated sampling enabled subject-specific analyses: four of six participants had minor, yet statistically significant, changes in microbial activity. No significant change was observed in the gene expression of host cells in stool. Levels of BMO excreted in feces after supplementation were not significantly different from placebo and were not correlated with dosage or expressed microbial enzyme levels. Collectively, these data suggest that BMO is fully digested in the human gastrointestinal tract prior to stool collection. Participants’ gut microbiomes remained stable but varied between individuals. Additionally, the unaltered host transcriptome provides further evidence for the safety of BMO as a dietary supplement or food ingredient.

2020-02-18 | GSE108809 | GEO

In vitro transcriptional profiling of Bacteroides fragilis in glucose and human milk oligosaccharides

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Project description:In this study, we quantitated the disappearance of intact HMOs and characterized the glycan digestion products in the gut that are produced by the action of microbial enzymes on HMOs and glycoconjugates from breast milk. Oligosaccharides from fecal samples of exclusively breast-fed infants were extracted and profiled using nanoLC-MS. Intact HMOs were found in the fecal samples, additionally, other oligosaccharides were found corresponding to degraded HMOs and non-HMO based compounds. The latter compounds were fragments of N-glycans released through the cleavage of the linkage to the asparagine residue and through cleavage of the chitobiose core of the N-glycan.

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In vitro transcriptional profiling of Bacteroides thetaiotaomicron in lactose, galactose and human milk oligosaccharides

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In vitro transcriptional profiling of Bacteroides fragilis in glucose and human milk oligosaccharides

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RNA sequencing of CACO-2 cells incubated with bifidobacteria grown on human milk oligosaccharides.

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Bifidobacterium longum subsp. infantis (B. infantis) strain dependent utilization of human milk oligosaccharides

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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