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- W3208784609 abstract "Abstract Background: One of the main goals of microbiome research is to identify bacterial members that significantly affect host phenotypes and understand their contributions to disease pathogenesis. Studies identifying bacterial members that dictate host phenotype have focused mainly on the dominant members, and the role of low abundance microbes in determining host phenotypes and pathogenesis of diseases remains unexplored. In this study, we compared the gut bacterial community of mice with wide-ranging microbial exposure to determine if low abundance bacteria vary based on microbial exposure or remain consistent. Results: We noted that similar to the high abundance bacterial community, a core community of low abundance bacteria made up a significant portion of the gut microbiome irrespective of microbial exposure. To determine the effect of low abundance bacteria on community structure and host gene expression, we devised a microbiome dilution strategy to “delete” out low abundance bacteria and engrafted the diluted microbiomes into germ-free mice. Our approach successfully excluded low abundance bacteria from small and large intestinal bacterial communities and induced global changes in microbial community structure and composition in the large intestine. Gene expression analysis of intestinal tissue revealed that loss of low abundance bacteria resulted in a drastic reduction in expression of multiple genes involved MHC class II antigen presentation pathway and T-cell cytokine production in the small intestine. The effect of low abundance bacteria on MHC class II expression was found specific to the intestinal epithelium at an early timepoint post-colonization and correlated with bacteria belonging to the family Erysipelotrichaceae. Conclusions: We conclude that low abundance bacteria have a significantly higher immuno-stimulatory effect compared to dominant bacteria and are thus potent drivers of early immune education in the gut. Therefore, characterizing immune interaction of low abundance bacteria with the host will offer greater insight into the intestinal immune landscape and disease pathogenesis.Keywords: Gut microbiome, Low abundance bacteria, Immune education, MHC class II, Erysipelotrichaceae" @default.
- W3208784609 created "2021-11-08" @default.
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- W3208784609 date "2021-10-29" @default.
- W3208784609 modified "2023-09-23" @default.
- W3208784609 title "Low Abundance Members of the Gut Microbiome are Potent Drivers of Immune Cell Education." @default.
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- W3208784609 doi "https://doi.org/10.21203/rs.3.rs-996487/v1" @default.
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