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Large-scale metabolic interaction network of the mouse and human gut microbiota

A Publisher Correction to this article was published on 12 August 2020

This article has been updated


The role of our gut microbiota in health and disease is largely attributed to the collective metabolic activities of the inhabitant microbes. A system-level framework of the microbial community structure, mediated through metabolite transport, would provide important insights into the complex microbe-microbe and host-microbe chemical interactions. This framework, if adaptable to both mouse and human systems, would be useful for mechanistic interpretations of the vast amounts of experimental data from gut microbiomes in murine animal models, whether humanized or not. Here, we constructed a literature-curated, interspecies network of the mammalian gut microbiota for mouse and human hosts, called NJC19. This network is an extensive data resource, encompassing 838 microbial species (766 bacteria, 53 archaea, and 19 eukaryotes) and 6 host cell types, interacting through 8,224 small-molecule transport and macromolecule degradation events. Moreover, we compiled 912 negative associations between organisms and metabolic compounds that are not transportable or degradable by those organisms. Our network may facilitate experimental and computational endeavors for the mechanistic investigations of host-associated microbial communities.

Measurement(s) metabolic process • transport • macromolecule catabolic process • gut microbiome measurement
Technology Type(s) digital curation • Phylogenetic Analysis
Factor Type(s) Species of microorganisms • Type of host cells
Sample Characteristic - Organism Homo sapiens • Mus musculus • Bacteria • Archaea • Eukaryota

Machine-accessible metadata file describing the reported data:

Background & Summary

The mammalian intestinal tract is colonized by various microorganisms, called the gut microbiota or microbiome1,2,3. Recent advances in metagenomics have revealed that alterations in the human gut microbiota are implicated in a number of disorders, such as obesity, inflammatory bowel disease, colorectal cancer, and diabetes4,5,6,7. At the center of the gut microbiota functions are the various interactions between microbes and their interplay with the host environment2,6,8. Microbes degrade diet-derived and host-derived chemical substances, and release the degradation products to other members of the community. The microbial transport of nutrients and metabolic byproducts gives rise to competition for resources and cooperative relationships via metabolic cross-feeding2,8. The metabolites secreted by the microbes are absorbed by host tissues, and translate into beneficial or detrimental mediators of host physiology6,9. As a result, such microbe-microbe and microbe-host interactions form a complex ecological network in the gut environment10.

In the microbiome research, one common practice for reconstructing metabolite-mediated microbial networks is to combine the entire biochemical reactions inferred from annotated metagenomes11,12. This method, by its nature, does not delineate biochemical reactions to the species from which they originate, making it difficult to elucidate interspecies interactions. On the other hand, there exist previous works on the modeling of diverse interspecies interactions explicitly mediated by metabolites that are transported (imported or exported) by individual microbial species13,14. Yet, these works are based on error-prone, automated identification protocols for transportable metabolites, which are possibly inaccurate to some degrees. There are ongoing computational efforts towards biologically realistic microbial interactions, by using manually curated, constraint-based metabolic models or relatively simple kinetic models15,16. Nevertheless, most of these models are far from the scale of diversity seen in the gut community, which typically comprises hundreds of different microbial species. Notably, this scale of microbial diversity has been recently captured by constraint-based metabolic models with semi-automatic model reconstructions17, but they still exhibit limited biological accuracies18,19,20.

Recently, we have constructed an extensive, literature-curated interspecies metabolic interaction network of the human gut microbiota, NJS16, which represents another system-level framework for gut microbiota analysis10. This network is primarily based on biological knowledge and experimental evidence documented in the literature. The network NJS16 encompasses >4,000 small-molecule transport and macromolecule degradation events of >500 bacterial and archaeal species and 3 human cell types. Although NJS16 is useful to explore the microbial community inside the human gut, mechanistic studies in the microbiome research field have been mainly conducted on animal models, rather than on human subjects, due to the technical and regulatory limitations on human experimentation21,22. Regarding animal models, physiological, anatomical, and genetic similarities between humans and mice, as well as massively accumulated knowledge of mouse genetics, have facilitated the use of murine models, to elucidate causality and mechanisms of host-microbiota interactions4,7,23. In this regard, a phylogenetic extension of NJS16 to murine gut microbes would be useful for the system-level mechanistic exploration of gut microbiota functions using murine animal models.

Here, we present a literature-curated, interspecies metabolic interaction network of the microbiota associated with the mouse and human gut, NJC19. To our knowledge, NJC19 represents the largest ever, literature-based network data resource for the mammalian gut microbiota, as a compilation of information from 769 research and review articles and textbooks (Fig. 1). This network is an advancement from our previous network, NJS16, which is limited to the human gut microbiota10. Specifically, NJC19 greatly expands the diversity of microbial species and host cells to those relevant to the mouse gut environments, and even covers a certain range of eukaryotic microbes that were completely missing in the predecessor NJS16. Therefore, NJC19 serves as a global network template, adaptable to the gut microbiota of either a mouse, human, or humanized mouse. Moreover, not only does NJC19 incorporate metabolite transport and macromolecule degradation events of the microbiota, but it also provides literature-annotated, negative information of which metabolic compounds are not able to be transported or degraded by the organisms. Such negative information would be useful to curate computational microbial models, such as constraint-based metabolic models, which can include false-positive transport reactions from automatic genome annotations.

Fig. 1
figure 1

Construction of the mammalian (mouse and human) gut microbiota interaction network NJC19. The flow chart of the network construction is presented. NJC19 is mainly built upon literature-curated, metabolic information of the mouse gut microbiota, combined with the revised version of NJS16 that represents the human gut microbiota interaction network.

We expect our network NJC19 to be a useful template for the mechanistic interpretation of various microbiome data from murine and human experiments.


Collection of mouse microbiome data and taxonomic identification for NJC19 construction

We aimed to construct a large-scale network for the mammalian gut microbiota that comprises microbial species populating the mouse and human gut. Figure 1 provides the overview of our network construction procedure. To construct the network, we started by collecting raw shotgun metagenome and 16S rRNA gene sequence data from fecal and cecal samples of laboratory and wild-caught mice from seven different studies3,24,25,26,27,28,29, as detailed in Online-only Table 1. It is noteworthy that the inclusion of the data from wild-caught mice3 allows the coverage of diverse microbial communities associated with natural murine lifestyles. The species-level taxonomic profiling of the shotgun metagenome sequence data was performed using the MetaPhlAn v2.0 software, which utilizes clade-specific marker sequences to identify microbial taxa30. When using MetaPhlAn v2.0, the “sensitive-local” mapping option was selected. For the taxonomic profiling of 16S rRNA gene sequence data, we used the open-reference OTU picking workflow of QIIME v1.8.0 with Greengenes v13_8_pp reference files31, and then selected species-level microbial taxa from the results. Among all species detected from the metagenome and 16S rRNA gene sequence data, priority for the collection of metabolic information (see below) was given to species absent in our previous network, NJS1610. In the case of the metagenome sequence data, the number of the detected species was rather excessive for our further processing; therefore, among those species, we only considered the species inhabiting ≥90% of the metagenome samples (with the relative abundance ≥0.001%) in each study. We found that the genera of these selected species account for the vast majority [89.6 ± 4.3% (avg. ± s.d.)] of the total microbial abundances in the metagenome samples. In addition, we manually considered some relevant species, such as Citrobacter rodentium32 (Online-only Table 23).

Collection and integration of metabolic information for NJC19 construction

Using the repertoire of the aforementioned microbial species, metabolic information primarily collected for NJC19 construction was direct experimental evidence of the import and export of small-molecule metabolites (e.g., sugars, vitamins, organic acids, and gases) and the degradation of macromolecules (e.g., starch, cellulose, hemicellulose, and mucin), reported in literature. For the small-molecule metabolites, we mostly considered primary metabolites, i.e., nutrients and metabolic byproducts associated with microbial growth or reproduction. In addition, literature sources that report the mRNA or protein expression for metabolite-specific enzymes or transporters were considered. When encountering the information of which chemical compounds are not able to be transported or degraded by a given organism, we recorded this negative information as well, as part of our collected data. Despite technically not being a part of the gut microbiota, some host cells directly affect or are affected by microbial metabolism, and thus were considered to be a functional extension of the microbial community. In a similar fashion to our previous network NJS16 for the human case, the specific mouse tissue cells that we considered were the intestinal absorptive cell, the mucin-secreting goblet cell, and the bile acid-secreting hepatocyte. Although the hepatocyte is not part of intestinal tissue, its secreted bile acids are utilized by microbes in the gut. In the case of the mouse intestinal absorptive cell, the information from a manually-curated, genome-scale metabolic model (iSS1393) was adopted33. All annotated metabolite transport or macromolecule degradation processes for different strains of the same species were consolidated for that species as its collective feature. Because degradation of a given macromolecule is often performed by multiple species in the gut, we considered the corresponding degradation products to be indirect export products of all species participating in that macromolecule degradation. In this work, we differentiated two macromolecules, xylan and mannan, from a “hemicellulose” macromolecule in NJS16, for more specific representation of their degradation products.

In parallel, we carefully re-examined the existing components of NJS1610,34, and removed the incorrectly-placed components and added new links found from literature, according to more specific and accurate information. The revised NJS16 was finally connected to the above mouse gut microbiota interaction network through the common chemical compounds shared by the both networks, to form the mouse and human gut microbiota interaction network, NJC19 (Fig. 1 and Table 1). NJC19 is provided in both human- and machine-readable forms, through Online-only Tables 15 and Supplementary File 1 (XLSX file) and through JavaScript Object Notation (JSON) files deposited in the Dryad Digital Repository35, respectively. In addition, the Cytoscape Session (cys) file of NJC19 is provided for interactive network visualization35.

Table 1 Datasets used for the construction and validation of NJC19.

Data Records

Our network NJC19 offers the reference map of the mammalian gut microbiota and chemical compound relationships (from 769 literature sources), which can be adapted for each context of mouse, human, and humanized mouse microbiomes. In NJC19, one set of nodes corresponds to organisms (i.e., microbial species and host cells), while the other set corresponds to chemical compounds (i.e., small-molecule metabolites or macromolecules). An organism and a chemical compound are connected if the organism imports, exports, or degrades the chemical compound. NJC19 comprises 838 microbial species (766 bacteria, 53 archaea, and 19 eukaryotes) in the mouse and human gut, 6 mouse and human cell types metabolically interacting with those microbes, and 283 chemical compounds (266 small molecules and 17 macromolecules)—all interconnected by 8,224 small-molecule transport or macromolecule degradation events. In addition, NJC19 provides information on small molecules and macromolecules that are reportedly not transportable or degradable by certain organisms—described through 912 negative metabolic associations. These negative associations can be particularly useful for the curation of automatically-generated metabolic models, which may include false-positive transport reactions derived from inaccurate genome annotations.

Figure 2a shows the overall phylogenetic composition of microbial species included in NJC19. To overview the network topology of NJC19, we counted the number of metabolites imported or exported by each microbial species. Each species in the network imports 5.8 and exports 3.5 metabolites on average, and the probability that a given species imports (or exports) k metabolites follows an exponential distribution P(k) erk (r ≈ 0.2 and 0.3 for the import and export cases, respectively; see Fig. 2b,c). Bacteroides thetaiotaomicron is one of the most promiscuous species, importing 33 and exporting 29 metabolites. Conversely, for each metabolite, we counted the number of species importing or exporting that metabolite. The probability that a given metabolite is imported (or exported) by k species follows a power-law distribution P(k) kγ (γ ≈ 1.4 for both import and export cases; Fig. 2d,e), which is much broader than the above exponential distributions. Among metabolites, glucose and acetate are the most frequent substrate and product, respectively, and are imported by 303 species (36.2% of the total species) and exported by 461 species (55.0% of the total species). In contrast, an average metabolite is imported by 21.8 species and exported by 13.0 species. Collectively, metabolites are highly uneven in terms of the ranges of their transporting species.

Fig. 2
figure 2

Microbial taxonomic composition and network structural properties of NJC19. (a) Fraction of microbial species in the network, which belong to each domain (left) or phylum (right). The right panel shows several phyla with the largest fractions in each domain. Both left and right panels show bacteria in blue, archaea in tan, and eukaryotes in green. (b,c) The vertical axis represents the distribution of the probability P(k) that a given microbial species imports (b) or exports (c) k metabolites on the horizontal axis. (d,e) The vertical axis represents the distribution of the probability P(k) that a given metabolite is imported (d) or exported (e) by k species on the horizontal axis.

As noted above, the full details of NJC19 are available in both human- and machine-readable forms, through Online-only Tables 15 and Supplementary Table 1 and through JSON files in the Dryad Digital Repository35, respectively. As noted above, the cys file of NJC19 is available for network visualization35, and can be accessed by Cytoscape v3.7.236.

Online-only Table 1 shows the detailed sources of mouse metagenome and 16S rRNA gene sequence data that were used for microbial species identification when we constructed NJC19. Online-only Table 2 shows the literature sources of metabolic information used for NJC19 construction. Online-only Table 3 shows the list of microbial species and host cell types in NJC19. The name of each microbial species is presented with the NCBI taxonomy ID. Online-only Table 4 includes the list of small-molecule metabolites and macromolecules in NJC19. The name of each compound is presented with the KEGG compound ID. Supplementary Table 1 provides all the metabolic associations between chemical compounds and microbial species/host cells in NJC19, along with their literature sources. These metabolic associations include both positive and negative associations (see above). Online-only Table 5 shows the degradation products of macromolecules in NJC19.

On the other hand, our JSON files35 include “NJC19_network.json”, “NJC19_organism.json”, “NJC19_compound.json”, and “NJC19_reference.json”. Among them, “NJC19_network.json” is equivalent to Supplementary Table 1, in terms of its contents. This file consists of a total of 9,136 items. Each object in the file is exactly matched with one association in Supplementary Table 1. Each object has its own identification number that starts with “NJC19_” followed by a five-digit number. The object includes four key-value pairs. The keys are “Species”, “Small-molecule metabolite or macromolecule”, “Metabolic activity”, and “Ref. #”, reminiscent of the column names in Supplementary Table 1. The other files “NJC19_organism.json”, “NJC19_compound.json”, and “NJC19_reference.json” include detailed information on the values of the keys “Species”, “Small-molecule metabolite or macromolecule”, and “Ref. #” in the file “NJC19_network.json”, respectively. In a similar fashion to Online-only Tables 3 and 4, each microbial species in “NJC19_organism.json” is annotated with the NCBI taxonomy ID, and each compound in “NJC19_compound.json” is annotated with the KEGG compound ID. Furthermore, the specific sample sources of these microbial species are also present in “NJC19_organism.json”. Full metadata of these JSON files are provided in another file “README_NJC19.txt”, which is available in the Dryad Digital Repository together with the JSON files35.

As described in Methods, our NJC19 construction was started with taxonomic identification of mouse gut microbiome samples. The comprehensive repertoire of those microbial taxa, identified before the collection of their metabolic information, is provided in the Dryad Digital Repository35 (Table 1). In the case of the metagenome samples, it also provides the list of the selected species based on the frequency of their occurrence across the samples (Methods).

Technical Validation

Metabolic information collected in this study was primarily experimental evidence of small molecule transport and macromolecule degradation events, reported in the literature. Given the information dispersed across research papers, review articles, and textbooks (Online-only Table 2), a careful read of these sources was done to distinguish experimentally-verified information from the predictions solely based on automated bioinformatics algorithms. To check the accuracy of our network, the entire individual links in the compiled network were thoroughly re-examined by the independent authors who had not participated in the initial construction of the network. If potential errors were identified from the examined links (e.g., errors from the possible misinterpretations of the literature), these errors were carefully corrected based on the discussion of multiple authors.

To further assess the validity of our network, we examined the correlations between microbe-metabolite links in the network and measured metabolite levels in the mouse gut and portal vein plasma. Specifically, we examined whether the abundance increase/decrease of microbes associated with a particular metabolite in our network is consistent with the shift of the metabolite level across different experimental conditions. Regarding this analysis, three published mouse studies were found to provide the information of both microbial and metabolite levels in their collected samples: one study is for antibiotics (cefoperazone) treatment and recovery37, another is for fecal microbiota transplantation from twins discordant for obesity4, and the other for gnotobiotic mice with multiple diets38. From these studies, we considered only the cases with clear variations in the microbial and metabolite levels, which span at least 1.5-fold changes across different mouse groups for the metabolites and their microbial producers/consumers in NJC19. We further excluded host- and diet-derived metabolites, which may confound our analysis focusing on the effects of microbial metabolism. For all the resulting metabolites, Fig. 3 presents the levels of their microbial producers in NJC19 and those metabolite levels across the mouse groups with varying experimental conditions (Table 1). In Fig. 3, we did not consider microbial consumers because they were relatively deficient in their abundance, less than a half of the producers in each case. Here, microbial producers of each metabolite from the gnotobiotic mouse study38 in Fig. 3 are defined as the microbial species that produce this metabolite in NJC19. However, for the other two studies in Fig. 3, the finest taxonomic information is available at the genus level35, from the 16S rRNA gene sequence data processed by the Ribosomal Database Project Classifier in this analysis (RDP Naive Bayesian rRNA Classifier Version 2.11 with 16S rRNA training set 16)39. Therefore, for these two studies, microbial producers of a given metabolite are defined as the microbial genera, with each having the species whose majority (>50%) can produce that metabolite in NJC19. We also defined microbial consumers in a similar way, although they were excluded from Fig. 3 as discussed above.

Fig. 3
figure 3

Comparison of mouse microbiome and metabolome data based on NJC19. (a,b) In the left panels, the abundances of the propionate (a) and acetate (b) producers in NJC19 were obtained from cecal 16S rRNA gene sequence data35 in ref. 37 Cecal metabolite concentrations in the right panels were obtained from Fig. 3c of the same study. Mouse group I consists of mice six weeks after 10-day cefoperazone treatment on mouse group II, cefoperazone-naive mice. (c) In the left panel, the abundances of the butyrate producers in NJC19 were obtained from fecal 16S rRNA gene sequence data35 in ref. 4 Cecal butyrate concentrations in the right panel were obtained from Fig. 2c of the same study. Although we used the fecal 16S rRNA gene sequence data for the left panel due to the limited data availability, fecal and cecal microbial compositions were found to strongly correlate in other samples from that study, allowing us to use the fecal sequence data as a proxy for the cecal ones. All mice were initially germ-free in the study. Mouse groups I to V comprise mice transplanted with an obese twin’s microbiota (Ob; group I), mice co-housed with Ob and Ln mice (group II; see next for the definition of Ln mice), mice transplanted with the lean co-twin’s microbiota (Ln; group III), Ob mice co-housed with Ln and germ-free mice (group IV), and Ln mice co-housed with Ob and germ-free mice (group V). (df) In the left panels, the abundances of the succinate (d,e) and isovalerate (f) producers in NJC19 were obtained from cecal 16S rRNA gene copy levels in Fig. 2a of ref. 38 We re-scaled succinate producers in (d) to the total 16S rRNA gene copy levels, because the corresponding succinate concentrations (d) were available per cecal dry weight (i.e., per cecal microbial load). Cecal and portal vein metabolite concentrations in the right panels were obtained from Fig. 2b and Supplementary Table 4 of the same study, respectively. Mouse groups ‘HF/HS’, ‘ZF/HS’, and ‘Chow’ represent gnotobiotic mice on a high-fat/high-sucrose diet, a zero-fat/high-sucrose diet, and a chow diet, respectively. In (ad), each error bar represents standard deviation across replicates. Error bars are missing for (e,f), as well as for the left panel in (d), and units are missing for the right panels in (e,f), because of the information unavailability from the data sources.

Figure 3 indeed demonstrates that alternations in the producer and metabolite levels tend to agree with each other, with the overall 71.4% matches of their increasing or decreasing tendencies across the mouse groups. For example, the propionate producers in NJC19 decreased by 90.0% in the cecum after cefoperazone treatment and recovery, consistent with an 88.5% decrease in the cecal propionate concentration (Fig. 3a). Likewise, the acetate producers in NJC19 decreased by 64.5% at the same time, consistent with a 59.3% decrease in the cecal acetate concentration (Fig. 3b). In these examples, the total microbial loads remained similar during the experiments37, and thus the metabolite concentration changes here are not likely to be a mere consequence of the microbial load changes. To test the statistical significance of these correlations, we introduce quantities fij, gij, and fij’ for each pair of mouse groups i and j: fij (gij) denotes a fold change from group i to group j in the measured producer (metabolite) abundance averaged over the replicates in the group i or j. fij’ denotes a group-i-to-j fold change in the average abundance of randomly-assigned producers, while the number of those randomly-assigned producers from all the data sources in Fig. 3 is maintained as the same as the number of the total observed producers. To assess the significance of the observed producer and metabolite correlations against a scenario that the producer information in NJC19 may not be more correct than expected by chance, we computed the P value as the probability of satisfying fij’ ≥ fij (fij’ ≤ fij) for all (i, j)-pairs that have fij and gij with both ≥ 1 (≤1). Accordingly, our P value calculation reveals that the producers in NJC19 and the detected metabolic compounds are significantly correlated in Fig. 3, thereby supporting the validity of the microbe-compound associations in NJC19 (P = 0.02 for Fig. 3a,c–e, P < 10–4 for Fig. 3f, and P = 0.06 for Fig. 3b).

Code availability

Our Python code that converts the JSON format of NJC19 network data (NJC19_network.json35) to the format of Supplementary Table 1 can be downloaded from the Dryad Digital Repository35. For the taxonomic profiling of microbiome samples for the NJC19 construction, we used MetaPhlAn v2.0 with the “sensitive-local” mapping option and QIIME v1.8.0 with Greengenes v13_8_pp reference files30,31, as described above. The aforementioned cys file of NJC19 for network visualization was produced by Cytoscape v3.7.236.

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We thank John F. Baines and Philipp Rausch for kindly providing wild-caught mouse metagenome data, and Jonathan W. Johnson for preparing most icons in Fig. 1. This work was supported by Hong Kong Baptist University, Faculty Research Grant Category II (FRG2/17-18/097) and Start-up Grant Tier 2 (RC-SGT2/18-19/SCI/001). This work was conducted using the resources of the High Performance Cluster Computing Centre, Hong Kong Baptist University, which receives funding from Research Grant Council, University Grant Committee of the HKSAR and Hong Kong Baptist University.

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P.-J.K. designed the research. R.L., J.J.T.C., T.L.P.M., H.K., S.K., J.S. and P.-J.K. performed the research. R.L., J.J.T.C., T.L.P.M., H.K., C.-M.G. and P.-J.K. analyzed the data. R.L., J.J.T.C., J.S., C.-M.G. and P.-J.K. wrote the manuscript.

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Correspondence to Pan-Jun Kim.

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Online-only Table

Online-only Table 1 Sources of mouse microbiome samples for microbial species identification for NJC19 construction.
Online-only Table 2 List of literature sources of metabolic information used for NJC19 construction.
Online-only Table 3 List of microbial species and host cell types in NJC19.
Online-only Table 4 List of small-molecule metabolites and macromolecules in NJC19.
Online-only Table 5 Degradation products of macromolecules in NJC19.

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Lim, R., Cabatbat, J.J.T., Martin, T.L.P. et al. Large-scale metabolic interaction network of the mouse and human gut microbiota. Sci Data 7, 204 (2020).

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