Abstract
The pathogenesis of inflammatory bowel diseases (IBD) is characterized by a dysregulated crosstalk between the host and the microbiome that leads to the development of inflammation and dysbiosis. Dysbiosis in IBD involves an expansion of Proteobacteria and a reduction of Firmicutes, particularly of butyrate-producing species such as Faecalibacterium prausnitzii. The epithelial NADPH oxidase dual oxidase 2 (DUOX2), which prevents bacterial colonization of the mucosa through the production of hydrogen peroxide (H2O2), is the only gene consistently altered in IBD patients before the onset of disease.
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