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• W2034490487 abstract "Background Reduced mucosal concentrations of Faecalibacterium prausnitzii predict disease recurrence in patients with Crohn's disease (CD). Siblings of CD patients have elevated risk of developing CD and share aspects of disease phenotype compared with healthy controls (HC), including dysbiosis in the faecal microbiota.[1] No study has compared the mucosal microbiota of CD siblings with unrelated healthy controls. Aim: to determine whether dysbiosis is present in the mucosal microbiota of siblings of CD patients with reference to HC, and to apply 16S rRNA gene pyrosequencing in order to accomplish a more comprehensive characterisation of that dysbiosis. Methods Rectal biopsies were taken from 21 patients with quiescent CD, 17 of their healthy siblings and 19 unrelated HC. Total DNA was extracted using phenol/chloroform based method. The V1 to V3 region of the bacterial 16S ribosomal RNA gene was amplified using PCR, and microbiota composition resolved by 454 pyrosequencing. Sequence processing and analyses were performed using the open source Mothur software package (www.mothur.org). Results For each group the resulting species in the microbiota were classified into core (common and abundant among similar subjects) versus infrequent and rare.[2] In terms of both microbial diversity (measured by both the ShannonWiener and Simpson's indexes of diversity) and species richness, the core mucosal microbiota of both siblings and CD patients were significantly less diverse than HC. Although the diversity of the rare microbiota was lower in CD compared with HC, there was no difference in diversity of rare microbiota between siblings and HC. Metacommunity profiling using the Bray-Curtis (SBC) index of similarity with unweighted pair group averages showed that the core microbial metacommunity of siblings was more similar to CD (SBC=0.70) than to HC, whereas the rare microbial metacommunity of siblings was more similar to HC (SBC= 0.42). As in CD patients, the species that contributed most to the dissimilarity between healthy siblings and HC was F. prausnitzii, Table 1. Conclusions This is the first in depth case-control study of the mucosal microbiota in the siblings of CD patients. We report a dysbiosis characterised by reduced diversity of core microbiota and lower abundance of F. prausnitzii. Given that siblings of CD patients have elevated risk of developing CD, this dysbiosis in otherwise healthy people implicates microbiological processes in CD pathogenesis and risk." @default.
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• W2034490487 date "2014-05-01" @default.
• W2034490487 modified "2023-09-25" @default.
• W2034490487 title "150 Siblings of Crohn's Disease Patients Exhibit a Pathologically Relevant Dysbiosis: Examination of Mucosal Microbiota Communities Using 16S rRNA Gene Pyrosequencing" @default.
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• W2034490487 doi "https://doi.org/10.1016/s0016-5085(14)60145-1" @default.
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