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In vitro effect of Isomalto/malto-polysaccharides (IMMPs) on human gut microbiota.

ABSTRACT: The effects of selected Isomalto/malto-polysaccharides (IMMPs) on human microbiota composition and function during in vitro fermentation

PROVIDER: PRJEB13209 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR1341720.fastq.gz	Fastqsanger.gz
	ERR1341730.fastq.gz	Fastqsanger.gz
	ERR1341740.fastq.gz	Fastqsanger.gz
	ERR1341750.fastq.gz	Fastqsanger.gz
	ERR1341721.fastq.gz	Fastqsanger.gz

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Metatranscriptomic analysis indicates prebiotic effect of isomalto/malto-polysaccharides on human colonic microbiota in-vitro.

Project description:Isomalto/malto-polysaccharides (IMMPs) are a novel type of soluble dietary fibres with a prebiotic potential promoting growth of beneficial microbes in the gut. However, the mode of action of IMMPs remains unknown. Previous studies on IMMPs showed an increase in total bacteria, especially lactobacilli, and higher production of short chain fatty acids (SCFA) when IMMPs were fed to rats or used during in vitro fermentation. Here we used metatranscriptomics to investigate how IMMPs with different amounts of α - (1 → 6) glycosidic linkages affected microbial function during incubation with human fecal inoculum. We showed that active microbial community dynamics during fermentation varied depending on the type of IMMP used and that the observed changes were reflected in the community gene expression profiles. Based on metatranscriptome analysis, members of Bacteroides, Lactobacillus and Bifidobacterium were the predominant degraders of IMMPs, and the increased gene expression in these bacteria correlated with high amounts of α - (1 → 6) glycosidic linkages. We also noted an increase in relative abundance of these bacteria and an activation of pathways involved in SCFA synthesis. Our findings could provide a baseline for more targeted approaches in designing prebiotics for specific bacteria and to achieve more controlled modulation of microbial activity towards desired health outcomes.

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