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      Fungal dysbiosis: immunity and interactions at mucosal barriers

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      Journal: Nature Reviews Immunology
      Publisher: Springer Nature

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          Abstract

          Changes in the composition of the microbiota — also known as dysbiosis — are important contributors to inflammatory diseases. In this Review, the authors explore how disruptions in fungal communities can influence host immunity, and how the immune system has evolved to distinguish between fungal infection and dysbiosis.

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          Regional specialization within the intestinal immune system.

          Allan M Mowat, William Agace (2014)
          The intestine represents the largest compartment of the immune system. It is continually exposed to antigens and immunomodulatory agents from the diet and the commensal microbiota, and it is the port of entry for many clinically important pathogens. Intestinal immune processes are also increasingly implicated in controlling disease development elsewhere in the body. In this Review, we detail the anatomical and physiological distinctions that are observed in the small and large intestines, and we suggest how these may account for the diversity in the immune apparatus that is seen throughout the intestine. We describe how the distribution of innate, adaptive and innate-like immune cells varies in different segments of the intestine and discuss the environmental factors that may influence this. Finally, we consider the implications of regional immune specialization for inflammatory disease in the intestine.
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            Fungal microbiota dysbiosis in IBD

            Harry Sokol, Valentin Leducq, Hugues Aschard … (2016)
            Objective The bacterial intestinal microbiota plays major roles in human physiology and IBDs. Although some data suggest a role of the fungal microbiota in IBD pathogenesis, the available data are scarce. The aim of our study was to characterise the faecal fungal microbiota in patients with IBD. Design Bacterial and fungal composition of the faecal microbiota of 235 patients with IBD and 38 healthy subjects (HS) was determined using 16S and ITS2 sequencing, respectively. The obtained sequences were analysed using the Qiime pipeline to assess composition and diversity. Bacterial and fungal taxa associated with clinical parameters were identified using multivariate association with linear models. Correlation between bacterial and fungal microbiota was investigated using Spearman's test and distance correlation. Results We observed that fungal microbiota is skewed in IBD, with an increased Basidiomycota/Ascomycota ratio, a decreased proportion of Saccharomyces cerevisiae and an increased proportion of Candida albicans compared with HS. We also identified disease-specific alterations in diversity, indicating that a Crohn's disease-specific gut environment may favour fungi at the expense of bacteria. The concomitant analysis of bacterial and fungal microbiota showed a dense and homogenous correlation network in HS but a dramatically unbalanced network in IBD, suggesting the existence of disease-specific inter-kingdom alterations. Conclusions Besides bacterial dysbiosis, our study identifies a distinct fungal microbiota dysbiosis in IBD characterised by alterations in biodiversity and composition. Moreover, we unravel here disease-specific inter-kingdom network alterations in IBD, suggesting that, beyond bacteria, fungi might also play a role in IBD pathogenesis.
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              Interactions between commensal fungi and the C-type lectin receptor Dectin-1 influence colitis.

              Iliyan D Iliev, Vincent A Funari, Kent D Taylor … (2012)
              The intestinal microflora, typically equated with bacteria, influences diseases such as obesity and inflammatory bowel disease. Here, we show that the mammalian gut contains a rich fungal community that interacts with the immune system through the innate immune receptor Dectin-1. Mice lacking Dectin-1 exhibited increased susceptibility to chemically induced colitis, which was the result of altered responses to indigenous fungi. In humans, we identified a polymorphism in the gene for Dectin-1 (CLEC7A) that is strongly linked to a severe form of ulcerative colitis. Together, our findings reveal a eukaryotic fungal community in the gut (the "mycobiome") that coexists with bacteria and substantially expands the repertoire of organisms interacting with the intestinal immune system to influence health and disease.
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                Author and article information

                Journal
                Title: Nature Reviews Immunology
                Abbreviated Title: Nat Rev Immunol
                Publisher: Springer Nature
                ISSN (Print): 1474-1733
                ISSN (Electronic): 1474-1741
                Publication date Created: June 12 2017
                Publication date (Print): June 12 2017
                Volume:
                Issue:
                Article
                DOI: 10.1038/nri.2017.55
                PMC ID: 5724762
                PubMed ID: 28604735
                SO-VID: 3708fee4-2537-4e64-8bbf-bb9dd46d0500
                Copyright © © 2017
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