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ABSTRACT: Microbial diversity in mouse intestinal faeces

PROVIDER: PRJNA918963 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR23025473_1.fastq.gz	Fastqsanger.gz
	SRR23025473_2.fastq.gz	Fastqsanger.gz
	SRR23025474_1.fastq.gz	Fastqsanger.gz
	SRR23025474_2.fastq.gz	Fastqsanger.gz
	SRR23025475_1.fastq.gz	Fastqsanger.gz

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Project description:Intestinal microorganisms impact on health maintaining gut homeostasis and shaping the host immunity, while gut dysbiosis associates with many conditions including autism, a complex neurodevelopmental disorder with multifactorial aetiology. In autism, gut dysbiosis correlates with symptom severity and is characterized by a reduced bacterial variability and a diminished beneficial commensal relationship. Microbiota can influence the expression of host microRNAs that, in turn, regulate the growth of intestinal bacteria by means of bidirectional host-gut micro-biota cross-talk. We investigated possible interactions among intestinal microbes and between them and host transcriptional modulators in autism. To this purpose, we analysed, by “omics” technologies, faecal microbiome, mycobiome and small non-coding-RNAs (particularly miRNAs and piRNAs) of children with autism and neurotypical development. Patients displayed gut dysbiosis, related to a reduction of healthy gut micro- and mycobiota, and up-regulated tran-scriptional modulators. The targets of dysregulated non-coding-RNAs are involved in intestinal permeability, inflammation and autism. Furthermore, microbial families, underrepresented in patients, participate to the production of human essential metabolites negatively influencing the health condition. Here, we propose a novel approach to analyse faeces as a whole and, for the first time, we detected miRNAs and piRNAs in faecal samples of patients with autism.

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Project description:We compared the microbiota of paired mouse caecal contents and faeces by applying a multi-omic approach, including 16S rDNA sequencing, shotgun metagenomics, and shotgun metaproteomics. The aim of the study was to verify whether faecal samples are a reliable proxy for the mouse colonic luminal microbiota, as well as to identify changes in taxonomy and functional activity between caecal and faecal microbial communities, which have to be carefully considered when using stool as sample for mouse gut microbiota investigations.

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Small intestinal microbial dysbiosis underlies symptoms associated with functional gastrointestinal disorders

Project description:Small intestinal bacterial overgrowth (SIBO) has been implicated in symptoms associated with functional gastrointestinal disorders (FGIDs), though mechanisms remain poorly defined and treatment involves non-specific antibiotics. Here we show that SIBO based on duodenal aspirate. culture reflects an overgrowth of anaerobes, does not correspond with patient symptoms, and may be a result of dietary preferences. Small intestinal microbial composition, on the other hand, is significantly altered in symptomatic patients and does not correspond with aspirate culture results. In a pilot interventional study we found that switching from a high fiber diet to a low fiber, high simple sugar diet triggered FGID-related symptoms and decreased small-intestinal microbial diversity and small-intestinal permeability. Our findings demonstrate that characterizing small intestinal microbiomes in patients with gastrointestinal symptoms may allow a more targeted antibacterial or a diet-based approach to treatment.

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