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. 2015 Jan 8;517(7533):205-8.
doi: 10.1038/nature13828. Epub 2014 Oct 22.

Precision microbiome reconstitution restores bile acid mediated resistance to Clostridium difficile

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Precision microbiome reconstitution restores bile acid mediated resistance to Clostridium difficile

Charlie G Buffie et al. Nature. .

Abstract

The gastrointestinal tracts of mammals are colonized by hundreds of microbial species that contribute to health, including colonization resistance against intestinal pathogens. Many antibiotics destroy intestinal microbial communities and increase susceptibility to intestinal pathogens. Among these, Clostridium difficile, a major cause of antibiotic-induced diarrhoea, greatly increases morbidity and mortality in hospitalized patients. Which intestinal bacteria provide resistance to C. difficile infection and their in vivo inhibitory mechanisms remain unclear. Here we correlate loss of specific bacterial taxa with development of infection, by treating mice with different antibiotics that result in distinct microbiota changes and lead to varied susceptibility to C. difficile. Mathematical modelling augmented by analyses of the microbiota of hospitalized patients identifies resistance-associated bacteria common to mice and humans. Using these platforms, we determine that Clostridium scindens, a bile acid 7α-dehydroxylating intestinal bacterium, is associated with resistance to C. difficile infection and, upon administration, enhances resistance to infection in a secondary bile acid dependent fashion. Using a workflow involving mouse models, clinical studies, metagenomic analyses, and mathematical modelling, we identify a probiotic candidate that corrects a clinically relevant microbiome deficiency. These findings have implications for the rational design of targeted antimicrobials as well as microbiome-based diagnostics and therapeutics for individuals at risk of C. difficile infection.

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Figures

Extended Data Figure 1
Extended Data Figure 1. Dynamics of intestinal microbiota structure and C. difficile susceptibility following antibiotic exposure
Strategy for determining C. difficile susceptibility duration post-antibiotic exposure (n=3 separately-housed mouse colonies per antibiotic arm) and relating infection resistance to microbiota structure (a). Intestinal bacterial density of animals before and after antibiotic exposure (b). Results were representative of two independent experiments. Center values (mean), error bars (s.e.m.) (b). Relative abundance of bacterial OTUs (≥97% sequence identity, >0.01% relative abundance) sorted by class (red) and corresponding C. difficile susceptibility (blue) among antibiotic-exposed mice (n=68) allowed to recover for variable time intervals prior to C. difficile infection challenge (c). Results were representative of two independent experiments. ND (not detectable).
Extended Data Figure 2
Extended Data Figure 2. Allo-HSCT patient timelines and C. difficile infection status transitions
Transitions between C. difficile (tcdB-positive) colonization status in patients receiving allogeneic hematopoietic stem cell transplantation, as measured by C. difficile 16S rRNA abundance during the period of hospitalization (light gray bars). Timepoints when C. difficile colonization was determined to be positive (red diamonds) and negative (blue diamonds), and when C. difficile infection was clinically diagnosed (black dots) and metronidazole was administered (dark gray bars), are displayed relative to the time of transplant per patient.
Extended Data Figure 3
Extended Data Figure 3. Identification of bacteria conserved across human and murine intestinal microbiota predicted to inhibit C. difficile
Identification of bacterial OTUs abundant in mice (n=68) and humans (n=24) (a) that account for a minority of OTU membership (b) but the majority of the structure of the intestinal microbiota of both host species following antibiotic exposure (b). Subnetworks of abundant OTUs predicted inhibit (blue) or positively associate with (red) C. difficile in murine (c) and human (d) intestinal microbiota.
Extended Data Figure 4
Extended Data Figure 4. Phylogenetic distribution of resistance-associated intestinal bacteria and isolates selected for adoptive transfer
The maximum likelihood phylogenetic tree (Kimura model, bootstrap of 100 replicates) was constructed using the MEGA 6.06 package from representative sequences of intestinal bacteria associated with resistance to C. difficile infection (blue), including cultured representatives subsequently used in adoptive transfer experiments (bold). The tree was rooted using intestinal bacteria associated with susceptibility to infection (red) as an out-group.
Extended Data Figure 5
Extended Data Figure 5. Adoptive transfer and engraftment of four-bacteria consortium or C. scindens ameliorates intestinal C. difficile cytotoxin load and acute C. difficile-associated weight loss
C. difficile toxin load in antibiotic-exposed animals receiving adoptive transfers 24 hours after C. difficile infection challenge (a). Animals weights 48 hours after infection challenge (b) and C. difficile CFU 24 hours after infection challenge (c). Engraftment of bacterial isolates in the intestinal microbiota of antibiotic-exposed animals two days following adoptive transfer of B. intestihominis, P. capillosus, B. hansenii, and/or C. scindens (d). Intestinal bacterial density (feces) from antibiotic-exposed mice administered suspensions containing 4 bacteria, C. scindens, or vehicle (PBS) as measured by quantitative RT-PCR of 16S rRNA genes (e). ****P<0.0001, ***P<0.001, **P<0.01, *P<0.05; Mann-Whitney (two-tailed) (a,b,d,e), Kruskal-Wallis with Dunn correction (c) (n=6–10 per group). Center values (mean), error bars (s.e.m.). Results were representative of at least two independent experiments. Numbers under group columns in (a) denote the number of mice with detectable engraftment of the given bacterium (out of 10 possible separately-housed animals per group) (d).
Extended Data Figure 6
Extended Data Figure 6. Adoptive transfer of consortia or C. scindens restores baiCD and secondary bile acid biosynthesis gene family abundance
PCR-based detection of the 7α-HSDH-encoding baiCD gene in bacterial isolates, intestinal microbiomes (feces) of animals prior to antibiotic exposure, and intestinal microbiomes (feces) of animals that, following antibiotic exposure, remained C. difficile-susceptible or recovered resistance to infection spontaneously or following adoptive transfer of bacterial isolates (a). Reconstituted abundance of the secondary bile acid biosynthesis gene family, as predicted by PICRUSt, in antibiotic-exposed animals receiving adoptive transfers (n=10 per group) (b). ***P<0.001, *P<0.05, ns (not significant); Mann-Whitney (two-tailed) (b). Center values (mean), error bars (s.e.m.).
Extended Data Figure 7
Extended Data Figure 7. Impacts of bacteria adoptive transfers on intestinal abundance of bile acids
Intestinal abundance of the secondary bile acids lithochoate (LCA) (a), ursodeoxycholate (UDCA) (b), and primary bile acids (c-f) in mice following antibiotic exposure and adoptive transfer of bacteria indicated. ****P<0.0001, *P<0.05, ns (not significant), Kruskal-Wallis test with Dunn’s correction. Center values (mean), error bars (s.e.m.).
Extended Data Figure 8
Extended Data Figure 8. C. difficile growth inhibition by secondary bile acids and intestinal content from antibiotic-naive animals
Addition of the secondary bile acids deoxycholate (DCA) (a) or lithochoate (LCA) (b) to culture media inhibits C. difficile. Bile acid-dependent inhibition of C. difficile enumerated by recovery of CFU after inoculation of vegetative C. difficile into cell-free (c) or whole (d) intestinal content harvested from C57BL/6J mice (n=5–6 per group), with or without pre-incubation with cholestyramine. **P<0.01, Mann-Whitney (two-tailed) (c,d).
Figure 1
Figure 1. Different antibiotics induce distinct changes to C. difficile infection resistance and intestinal microbiota composition
Susceptibility to C. difficile infection following clindamycin (a), ampicillin (b), or enrofloxacin (c). Correlation of C. difficile CFU and toxin in cecal content following infection (d). Intestinal microbiota composition at timepoints indicated (e,f,g). Each stacked bar represents the mean microbiota composition of three separately-housed animals. ****P<0.0001. Center values (mean), error bars (s.e.m.) (a, b, c).
Figure 2
Figure 2. Native intestinal bacterial species conserved across murine and human microbiota are predicted to inhibit C. difficile infection
Intestinal microbiota alpha diversity (a) and Beta diversity (weighted UniFrac distances) (b) of antibiotic-naïve (n=15) and antibiotic-exposed animals susceptible (n=21) or resistant (n=47) to C. difficile infection. Correlation of individual bacterial OTUs with susceptibility to C. difficile infection (c). Colonization (C. difficile-negative to -positive) and clearance (C. difficile-positive to –negative) events among C. difficile-diagnosed and carrier patients included in microbiota time-series inference modeling (d). Bacterial species with strong C. difficile interactions in human and murine microbiota models (e) that exist in a conserved subnetwork predicted to inhibit (blue) or positively associate (red) with C. difficile (f). ***P<0.001. In (c), P<0.0005 (“any biodiversity”, n=68) or P<0.05 (“Low biodiversity”, Shannon≤1 (n=16 animals). Center values (mean), error bars (s.e.m.).
Figure 3
Figure 3. Adoptive transfer of resistance-associated intestinal bacteria following antibiotic exposure increases resistance to C. difficile infection
Intestinal burden of C. difficile CFU (a) and toxin (b) 24 hours after C. difficile infection of antibiotic-exposed animals receiving adoptive transfers. Weight loss (c) and mortality (d) of animals post-infection. Correlation of adoptively-transferred bacteria engraftment with C. difficile susceptibility, (e) and microbiota biodiversity (f) pre-infection. ****P<0.0001, **P<0.01, *P<0.05, ns (not significant). Mean (f)), error bars (range (a), s.e.m. (f)).
Figure 4
Figure 4. C. scindens-mediated C. difficile inhibition is associated with secondary bile acid synthesis and dependent on bile endogenous to intestinal content
Relative abundance of secondary bile species (a) and biosynthesis gene abundance predicted by PICRUSt (b) in intestinal content from antibiotic-exposed C. difficile susceptible (n=21), resistant (n=47), and pre-antibiotic (n=15) animals. Correlation of C. difficile susceptibility with secondary bile acid biosynthesis gene family abundance in intestinal content (n=6) quantified using shotgun sequencing (c). Intestinal abundance of deoxycholic acid (DCA) following adoptive transfer of bacteria (n=10 per group) (d). Correlation of C. scindens engraftment with DCA abundance and baiCD status in intestinal content of antibiotic-exposed, adoptively transferred animals (n=30) (e). Bile acid-dependent C. scindens-mediated inhibition of C. difficile quantified ex vivo (n=6 per group) (f). ****P<0.0001, ***P<0.001, **P<0.01, *P<0.05. Gylceroltransferase F51, endogenous reference gene (c). Shaded region around mean ‘pre-antibiotic (abx)’ DCA abundance (s.d.) (e).

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