GUT MICROBIOTA COMPOSITION AND CHARACTERIZATION OF CULTIVABLE FUNGAL ISOLATES IN IBS PATIENTS
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PROVIDER: PRJEB38069 | ENA |
REPOSITORIES: ENA
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Project description:Studies so far conducted on irritable bowel syndrome (IBS) have been focused mainly on the role of gut bacterial dysbiosis in modulating the intestinal permeability, inflammation, and motility, with consequences on the quality of life. Limited evidences showed a potential involvement of gut fungal communities. Here, the gut bacterial and fungal microbiota of a cohort of IBS patients have been characterized and compared with that of healthy subjects (HS). The IBS microbial community structure differed significantly compared to HS. In particular, we observed an enrichment of bacterial taxa involved in gut inflammation, such as Enterobacteriaceae, Streptococcus, Fusobacteria, Gemella, and Rothia, as well as depletion of health-promoting bacterial genera, such as Roseburia and Faecalibacterium. Gut microbial profiles in IBS patients differed also in accordance with constipation. Sequence analysis of the gut mycobiota showed enrichment of Saccharomycetes in IBS. Culturomics analysis of fungal isolates from feces showed enrichment of Candida spp. displaying from IBS a clonal expansion and a distinct genotypic profiles and different phenotypical features when compared to HS of Candida albicans isolates. Alongside the well-characterized gut bacterial dysbiosis in IBS, this study shed light on a yet poorly explored fungal component of the intestinal ecosystem, the gut mycobiota. Our results showed a differential fungal community in IBS compared to HS, suggesting potential for new insights on the involvement of the gut mycobiota in IBS. KEY POINTS: • Comparison of gut microbiota and mycobiota between IBS and healthy subjects • Investigation of cultivable fungi in IBS and healthy subjects • Candida albicans isolates result more virulent in IBS subjects compared to healthy subjects.
| S-EPMC8053167 | biostudies-literature
Project description:Gut mycobiota in an Italian cohort of IBS patients
| PRJEB42596 | ENA
Project description:Irritable Bowel Syndrome (IBS) is a disorder of the gut-brain axis, characterized by altered gut function and frequent psychiatric co-morbidity. Although altered intestinal microbiome profiles have been documented, their relevance to the clinical expression of IBS is unknown. To evaluate a functional role of the microbiota, we colonized germ-free mice with fecal microbiota from healthy controls or IBS patients with accompanying anxiety, and monitored gut function and behavior. Mouse microbiota profiles clustered according to their human donors. Despite having taxonomically similar composition as controls, mice with IBS microbiota had distinct serum metabolomic profiles related to neuro- and immunomodulation. Mice with IBS, but not control microbiota, exhibited faster gastrointestinal transit, intestinal barrier dysfunction, innate immune activation and anxiety-like behavior. These results support the notion that the microbiota contributes to both intestinal and behavioral manifestations of IBS and rationalize the use of microbiota-directed therapies in ameliorating IBS.
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Project description:Irritable bowel syndrome (IBS) patients often experience meal associated symptoms. Our objective was to determine small intestinal mechanisms of lipid-induced symptoms and rectal hypersensitivity in IBS based on RNA-seq.
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Project description:A subset of post-infection irritable bowel syndrome (PI-IBS) patients have elevated, or high fecal proteolytic activity (PA). Fecal PA has been shown to correlate with increased symptom severity as well as lower quality of life scores, increased fecal output and increased intestinal permeability. To address the underlying mechanisms of barrier disruption as a consequence of high fecal PA, colonic biopsies were collected from healthy individuals PI-IBS patients (n=11). Individuals diagnosed with PI-IBS were further divided in to 2 subgroups, high PA and low PA as defined by the PA in matched fecal samples. RNA was extracted from the biopsies for bulk RNA sequencing to understand transcriptional differences between healthy and high PA PI-IBS patients as well as high PA and Low PA PI-IBS patients.
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Project description:An investigation of gene expression changes in rectal biopsies from donors with IBS compared to controls to begin to understand this complex syndrome. To further investigate differences between IBS groups (constipation and diarrhoea predominant) (part1) and how IBS relates to bacterial infection (part2) with biopsies taken 6 months after Campylobacter jejuni infection. Part1: 18 Constipation predominant IBS subjects (IBS-C) and 27 diarrhoea predominant IBS subjects (IBS-D) compared to 21 healthy volunteers (HV). Part2: 21 Campylobacter jejuni infection (PIBD, PIBS, PINIBS) compared to 19 healthy volunteers (HV). PIBD = post Campylobacter infection with IBS (within 6 months) PIBS = post infection IBS (unknown time point and organism) PINIBS = post Campylobacter infection with no resulting IBS
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Project description:Purposes: To investigate the epigenetic mechanism of IBS-D(Irritable Bowel Syndrome with Diarrhea) by tRF & tiRNA sequencing in intestinal biopsies of IBS-D patients and healthy volunteers Methods: Five IBS-D and five healthy volunteers were screened, and biopsies were taken under colonoscopy. Small RNA sequencing was performed on Illumina NexSeq instrument Results:If P < 0.05, fold change > 1.5 as the cutoff, there were 14 up-regulated tRFs & tiRNAs and 14 down-regulated tRFs & tiRNAs. Conclusions:There were 14 up-regulated tRFs & tiRNAs and 14 down-regulated tRFs & tiRNAs in intestinal tissues of IBS-D .
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Project description:IBS-D is a disease with multi-factor interaction between environment, central system, gut and gene, and its pathogenesis is relatively complex. In order to find the regulation of mRNA in the pathogenesis of IBS-D, intestinal tissue samples of IBS-D patients and healthy subjects were obtained (5 IBS-D patients,5 healthy subjects)， Changes in mRNA expression profiles were detected by high-throughput sequencing.
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Project description:Micro-inflammation and gut dysfunction are features of diarrhea-irritable bowel syndrome (d-IBS) patients, although the underlying interacting molecular mechanisms remain mostly unknown. Therefore, we aimed to identify critical networks and signaling pathways active in chronic diarrhea-associated inflammation. Experiment Overall Design: Healthy volunteers and d-IBS patients were studied. Jejunal biopsies were subjected to chip analysis (Affymetrix Human Genome U133 Plus 2.0 GeneChips).
2009-02-21 | E-GEOD-14841 | biostudies-arrayexpress
Project description:IBS: Patients who have undergone a diagnostic program for gastrointestinal symptoms and where the diagnosis irritable bowel syndrome was reached. UC: Patients with well-diagnosed ulcerative colitis Keywords: other
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