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Cell. Author manuscript; available in PMC 2015 November 6.

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PMCID: PMC4255478

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Human genetics shape the gut microbiome

Julia K. Goodrich,^{1, 2} Jillian L. Waters,^{1, ii} Angela C. Poole,^{1, two} Jessica L. Sutter,^{i, two} Omry Koren,^{i, ii, ¥} Ran Blekhman,^{i, $} Michelle Beaumont,³ William Van Treuren,⁴ Rob Knight,^{iv, five, half-dozen} Jordana T. Bell,³ Timothy D. Spector,³ Andrew G. Clark,ⁱ and Ruth E. Ley^{1, 2, *}

Julia Thou. Goodrich

¹ Department of Molecular Biology & Genetics, Cornell University, Ithaca, NY 14853, USA

² Department of Microbiology, Cornell Academy, Ithaca, NY 14853, Usa

Jillian L. Waters

¹ Section of Molecular Biology & Genetics, Cornell University, Ithaca, NY 14853, United states

² Department of Microbiology, Cornell University, Ithaca, NY 14853, USA

Angela C. Poole

¹ Department of Molecular Biology & Genetics, Cornell University, Ithaca, NY 14853, United states of america

² Section of Microbiology, Cornell University, Ithaca, NY 14853, United states

Jessica L. Sutter

¹ Department of Molecular Biology & Genetics, Cornell University, Ithaca, NY 14853, USA

² Section of Microbiology, Cornell Academy, Ithaca, NY 14853, USA

Omry Koren

¹ Department of Molecular Biological science & Genetics, Cornell University, Ithaca, NY 14853, U.s.

² Section of Microbiology, Cornell University, Ithaca, NY 14853, U.s.a.

Ran Blekhman

ⁱ Section of Molecular Biology & Genetics, Cornell University, Ithaca, NY 14853, USA

Michelle Beaumont

³ Department of Twin Research & Genetic Epidemiology, King's College London, SE1 7EH London, Britain

William Van Treuren

⁴ Department of Chemistry and Biochemistry, Academy of Colorado, Bedrock, CO 80309, United states of america

Rob Knight

^iv Department of Chemistry and Biochemistry, Academy of Colorado, Boulder, CO 80309, The states

⁵ Biofrontiers Institute, Academy of Colorado, Boulder, CO 80309, USA

^six Howard Hughes Medical Institute, University of Colorado, Boulder, CO 80309, USA

Jordana T. Bell

³ Department of Twin Research & Genetic Epidemiology, King'southward College London, SE1 7EH London, UK

Timothy D. Spector

ⁱⁱⁱ Department of Twin Research & Genetic Epidemiology, Male monarch's College London, SE1 7EH London, U.k.

Andrew G. Clark

¹ Department of Molecular Biology & Genetics, Cornell University, Ithaca, NY 14853, USA

Ruth Due east. Ley

^ane Department of Molecular Biology & Genetics, Cornell University, Ithaca, NY 14853, The states

² Department of Microbiology, Cornell University, Ithaca, NY 14853, USA

Supplementary Materials

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Summary

Host genetics and the gut microbiome tin both influence metabolic phenotypes. However, whether host genetic variation shapes the gut microbiome and interacts with it to affect host phenotype is unclear. Here, we compared microbiotas across > 1,000 fecal samples obtained from the TwinsUK population, including 416 twin-pairs. We identified many microbial taxa whose abundances were influenced past host genetics. The most heritable taxon, the family Christensenellaceae, formed a cooccurrence network with other heritable Leaner and with methanogenic Archaea. Furthermore, Christensenellaceae and its partners were enriched in individuals with low body mass alphabetize (BMI). An obese-associated microbiome was amended with Christensenella minuta, a cultured fellow member of the Christensenellaceae, and transplanted to germfree mice. C. minuta subpoena reduced weight proceeds and contradistinct the microbiome of recipient mice. Our findings indicate that host genetics influence the composition of the homo gut microbiome and can do and so in ways that impact host metabolism.

Introduction

The human gut microbiome has been linked to metabolic affliction and obesity (Karlsson et al., 2013; Le Chatelier et al., 2013; Ley et al., 2005; Qin et al., 2012; Turnbaugh et al., 2009). Variation in host genetics can also underlie susceptibility to metabolic disease (Frayling et al., 2007; Frazer et al., 2009; Herbert et al., 2006; Yang et al., 2012). Despite these shared effects, the human relationship betwixt host genetic variation and the diversity of gut microbiomes is largely unknown.

The gut microbiome is environmentally caused from birth (Costello et al., 2012; Walter and Ley, 2011), therefore it may part as an environmental factor that interacts with host genetics to shape phenotype, as well every bit a genetically determined aspect that is shaped by, and interacts with, the host (Bevins and Salzman, 2011; Spor et al., 2011; Tims et al., 2011). Because the microbiome tin can exist modified for therapeutic applications (Borody and Khoruts, 2012; Hamilton et al., 2013; Khoruts et al., 2010; van Nood et al., 2013), it constitutes an attractive target for manipulation. Once the interactions betwixt host genetics and the microbiome are understood, its manipulation could exist optimized for a given host genome to reduce affliction take chances.

Although gut microbiomes tin can differ markedly in diversity across adults (Consortium, 2012; Qin et al., 2010), family members are oftentimes observed to have more than similar microbiotas than unrelated individuals (Lee et al., 2011; Tims et al., 2013; Turnbaugh et al., 2009; Yatsunenko et al., 2012). Familial similarities are usually attributed to shared environmental influences, such as dietary preference, a powerful shaper of microbiome composition (Cotillard et al., 2013; David et al., 2013; Wu et al., 2011). Yet related individuals share a larger degree of genetic identity, raising the possibility that shared genetic composition underlies familial microbiome similarities.

Back up for a host genetic event on the microbiome comes generally from studies taking a targeted approach. For case, the concordance charge per unit for carriage of the methanogen Methanobrevibacter smithii is higher for monozygotic (MZ) than dizygotic (DZ) twin pairs (Hansen et al., 2011), and studies comparison microbiotas between human subjects differing at specific genetic loci have shown gene-microbiota interactions (Frank et al., 2011; Khachatryan et al., 2008; Rausch et al., 2011; Rehman et al., 2011; Wacklin et al., 2011). A more than full general approach to this question has linked genetic loci with abundances of gut bacteria in mice (Benson et al., 2010; McKnite et al., 2012), but in humans, a general approach (east.g., using twins) has failed to reveal significant genotype furnishings on microbiome diversity (Turnbaugh et al., 2009; Yatsunenko et al., 2012). Thus, heritable components of the man gut microbiome remain to exist identified using an unbiased approach.

Here, we assessed the heritability of the gut microbiome with a well-powered twin study. Comparisons between MZ and DZ twin pairs allowed u.s.a. to assess the impact of genotype and early shared environment on their gut microbiota. Our study addressed the following questions: Which specific taxa within the gut microbiome are heritable, and to what extent? Which predicted metagenomic functions are heritable? How do heritable microbes relate to host BMI? Finally, we apply fecal transplants into germfree mice to assess the phenotype effects of the almost heritable taxon.

Results

Twin dataset

We obtained one,081 fecal samples from 977 individuals: 171 MZ and 245 DZ twin pairs, 2 from twin pairs with unknown zygosity, and 143 samples from simply one twin within a twinship (i.due east., unrelated). In addition, nosotros collected longitudinal samples from 98 of these individuals (see Supplemental Information). Well-nigh subjects were female, ranging in age from 23 to 86 years (average age: sixty.half dozen ± 0.3 years). The boilerplate BMI of the subjects was 26.25 (± 0.16) with the post-obit distribution: 433 subjects had a low to normal BMI (<25), 322 had an overweight BMI (25-30), 183 were obese (>30) and 39 individuals in which the current BMI status was unknown. We generated 78,938,079 quality-filtered sequences that mapped to the Bacteria and Archaea in the Greengenes database (average sequences per sample: 73,023 ± 889).

Microbiome limerick and richness

Nosotros sorted sequences into ix,646 operational taxonomic units (OTUs, ≥97% ID). Of these OTUs, 768 were present in at least 50% of the samples. Taxonomic classification revealed a fairly typical Western variety profile: the dominant bacterial phyla were Firmicutes (53.nine% of total sequences), Bacteroidetes (35.three%), Proteobacteria (four.5%), with Verrucomicrobia, Actinobacteria, and Tenericutes each comprising ii% of the sequences, and a tail of rare bacterial phyla that together accounted for the remaining 1% of the sequences.

The most widely shared methanogen was M. smithii (64% of people, using nonrarefied data), followed by vadinCA11, a member of the Thermoplasmata with no cultured representatives (~6%), Methanospheara stadtmanae (~4%), and Methanomassiliicoccus (~4%, a member of the Thermoplasmata). 40-six of the 61 samples in which we detected vadinCA11 also contained 1000. smithii, indicating that the two most dominant archaeal taxa are non mutually exclusive. Faith's PD was positively correlated with the relative abundance of the family Methanobacteriaceae (rho = 0.42 rarefied, 0.37 for transformed counts, P < 1 x x⁻¹¹), which corroborates previous reports of higher richness associating with methanogens.

Broad diversity comparisons between MZ and DZ twin pairs

We observed that microbiotas were more than like overall inside individuals (resampled) than betwixt unrelated individuals (P < 0.001 for weighted and unweighted UniFrac and Bray-Curtis using a Educatee's t-test with 1,000 Monte Carlo simulations; Table S1A), and were also more similar within twin pairs compared to unrelated individuals (P < 0.009 for weighted and unweighted UniFrac and Bray-Curtis; Effigy 1, S1 and Table S1). MZ twin pairs had more similar microbiotas than DZ twins for the unweighted UniFrac metric (P = 0.032), but non the weighted UniFrac and Bray-Curtis metrics (Figures 1A, S1). Every bit greater similarities for MZ versus DZ twin pairs are seen in unweighted UniFrac simply non abundance-based metrics, MZ similarities are driven by shared community membership rather than structure.

Microbiomes are more similar for monozygotic than dizygotic twins

A, C-F: Box plots of beta-diverseness distances between microbial communities obtained when comparing individuals within twinships for monozygotic (MZ) twin pairs and dizygotic (DZ) twin pairs, and between unrelated individuals (UN). A: the whole microbiome; C: the bacterial family Ruminococcaceae; D-E: the bacterial family Lachnospiraceae; F: the family Bacteroidaceae. The specific distance metric used in each assay is indicated on the axes. *P<0.05, **P<0.01, ***P<0.001 for Educatee's t-tests with i,000 Monte Carlo simulations. B: The average relative abundances in the whole dataset for the top half-dozen most prevalent bacterial families (unrarefied data, see Methods). Relates to Figure S1 and Table S1.

We adjacent constrained the distance metric analyses to the iii most ascendant bacterial families: the Lachnospiraceae and Ruminococcaceae (Firmicutes) and Bacteroidaceae (Effigy 1B). Nosotros observed greater similarities for MZ compared to DZ twins using the unweighted UniFrac metric within the Ruminococcaceae family (Effigy 1C). Within the Lachnospiraceae family, significantly greater similarity for MZ compared to DZ twins emerged using the weighted UniFrac and Bray-Curtis metrics (Figures 1D, Eastward). In contrast, when restricted to the Bacteroidaceae family unit, we found that MZ and DZ twins had similar pair-wise variety using all three metrics (Figures 1F, S1B and S1E).

MZ twins have more highly correlated microbiotas

We side by side asked if the abundances of specific taxa were generally more highly correlated within MZ twin pairs compared to DZ twin pairs. For each twin pair we generated intraclass correlation coefficients (ICCs) for the relative abundances of OTUs. Mean ICCs were significantly greater for MZ compared to DZ twin pairs (Wilcoxon signed rank test on ICCs at the OTU level, P = 6 ten 10⁻⁰⁴; Effigy 2). Since many OTUs are closely phylogenetically related, their abundances may non be independent, which may inflate levels of significance. To account for this effect, nosotros maintained the structure of the phylogenetic tree but permuted the MZ and DZ labels in x,000 tests to generate randomized ICCs. Equally an independent validation, we also applied these analyses to two previously published datasets generated originating in a population of twins from Missouri, Us: 'Turnbaugh' (Turnbaugh et al., 2009), which described 54 twin pairs ranging from 21-32 years of historic period, and 'Yatsunenko' (Yatsunenko et al., 2012), which included 63 twin pairs with an age range of 13-thirty years of age. Mean ICCs of OTU abundances were significantly greater for MZ compared to DZ twin pairs in both of these datasets (significance by permutation: P < 0.001 and 0.047 respectively; Figure S2), corroborating our observations.

OTU relative abundances are more highly correlated inside MZ than DZ twin pairs

At left is a phylogeny of taxa in the TwinsUK study (Greengenes tree pruned to include just OTUs shared by l% of the TwinsUK participants) and at correct are corresponding twin-pair intra class correlation coefficients (ICCs). ICCs were calculated for each OTU and the divergence in correlation coefficients for MZ twin pairs versus DZ twin pairs. Bars pointing to the right indicate that the difference is positive (i.eastward., MZ ICCs > DZ ICCs) and confined pointing to the left indicate negative differences (DZ ICCs > MZ ICCs). The scale bar associated with the phylogeny shows substitutions/site. Relates to Effigy S2.

Heritability estimates for OTUs and predicted functions

Nosotros estimated heritability using the twin-based ACE model, which partitions the total variance into three component sources: genetic effects (A), common environment (C), and unique environment (East) (Eaves et al., 1978). The largest proportion of variance in abundances of OTUs could be attributed to the twins' unique environments (i.due east., Eastward > A; Tabular array S2). Still, for the majority of OTUs (63%), the proportion of variance attributed to genetic furnishings was greater than the proportion of variance attributed to common environment (A > C; Table S2).

From the ACE model we calculated 95% confidence intervals for the heritability estimates, and determined the significance of the heritability values using a permutation method to generate nominal P values (Table S2). We found a high correlation betwixt the tail probability for inclusion of zero in the confidence interval of heritability and the P values obtained from the permutation tests (rho = 0.872, P < 10⁻¹⁵), indicating substantial consistency across these tests. Although heritability studies traditionally written report confidence intervals and nominal P values only, we also generated FDR-corrected P values (Table S2).

We besides applied the ACE model to the abundances of sequences mapping to each node in the phylogeny. Across the three studies, the nodes of the phylogeny with the strongest heritabilities lie within the Ruminococcaceae and Lachnospiraceae families, and the Bacteroidetes are mostly environmentally determined (Figures 3 and S3). Subsets of the Archaea are as well heritable in the TwinsUK and the Yatsunenko studies (the Turnbaugh study did not include data for Archaea).

Heritability of microbiota in the TwinsUK dataset

A: OTU Heritability (A from ACE model) estimates mapped onto a microbial phylogeny and displayed using a rainbow gradient from blue (A = 0) to red (A ≥ 0.iv). This phylogenetic tree was obtained from the Greengenes database and pruned to include just nodes for which at least 50% of the TwinsUK participants were represented. B: The significance for the heritability values shown in A was determined using a permutation test (n=1,000) and are shown on the same phylogeny as in panel A. P values range from 0 (red) to >0.ane (blue). Relates to Effigy S3 and Table S2.

We characterized the longitudinal stability of each OTU by calculating the ICCs of the OTU abundance across repeat samples, which consisted of ii samples nerveless from the same individual at different times. Past permuting these repeat sample ICCs, we found that heritable OTUs (A > 0.2) were more stable (ICC > 0.6) than expected by chance (Effigy S3E; P < 0.001, P value was determined as the fraction of permutations that had greater than or equal to the observed number of OTUs that are both heritable and stable).

We used PICRUSt (Langille et al., 2013) to produce predicted metagenomes from the 16S rRNA gene sequence data and applied the ACE model to approximate the heritability of predicted abundances of conserved orthologous groups (COGs). This analysis revealed 6 functions with heritabilities A > 0.2 and nominal P values < 0.05 (P values are generated by permutation testing; Supplementary Methods; Table S2). Correcting for multiple comparisons, one category, "secondary metabolites biosynthesis, ship and catabolism" (Q), passed a stringent FDR (A = 0.32, 95% CI = 0.16-0.44). We also tested alpha diversity for heritability and institute that it was not heritable.

The family Christensenellaceae is the well-nigh highly heritable taxon

The nearly heritable taxon overall was the family Christensenellaceae (A = 0.39, 95% confidence interval 0.21-0.49, P = 0.001, Figure 4A and Table S2; this taxon passes a stringent FDR) of the order Clostridiales. Christensenellaceae was also highly heritable in the Yatsunenko dataset (A = 0.62, 95% conviction interval 0.38-0.77; Effigy 4B and Table S2). We repeated this analysis for the taxa abundances with the consequence of BMI regressed out, and results were highly correlated (Pearson correlation = 0.95, P < 1×x⁻¹⁵).

MZ twin pairs accept college correlations of Christensenellaceae than DZ twin pairs in TwinsUK and Yatsunenko datasets

Besprinkle plots comparing the abundances of Christensenellaceae in the gut microbiota of MZ and DZ co-twins. Christensenellaceae abundances were transformed and adapted to command for technical and other covariates (Residuals are plotted, see Supplemental Methods) and the data are separated by zygosity (MZ or DZ twins). A: TwinsUK dataset. B: Yatsunenko dataset.

Christensenellaceae is the hub in a co-occurrence network with other heritable taxa

We observe a module of co-occurring heritable families, and the hub (node connected to well-nigh other nodes) of this module is the family unit Christensenellaceae (Figures 5A and S4A). The heritable module includes the families Methanobacteriaceae (Archaea) and Dehalobacteriaceae (Firmicutes) and the orders SHA-98 (Firmicutes), RF39 (Tenericutes) and ML615J-28 (Tenericutes). The Christensenellaceae-network is anti-correlated with the Bacteroidaceae and Bifidobacteriaceae families. Nosotros validated these results by applying this method to the family unit-level taxonomic abundances in the Yatsunenko dataset (as this ane is most technically similar to the TwinsUK dataset), where we also found the same Christensenellaceae-centered module of heritable families anti-correlated to the Bacteroidaceae/Bifidobacteriaceae module (Effigy S4B).

Christensenellaceae is the hub of a consortium of co-occurring heritable microbes that are associated with a lean BMI

A and B show the same network built from SparCC correlation coefficients between sequence abundances complanate at the family level. The nodes represent families and the edges correspond the correlation coefficients between families. Edges are colored blue for a positive correlation and grey for a negative correlation, and the weight of the edge reflects the strength of the correlation. Nodes are positioned using an edge-weighted strength directed layout. In panel A, the nodes are colored by the heritability of the family, and in console B, the nodes are colored past the significance of the association families and a normal vs. obese BMI. Family unit names are either indicated on the panel, or nodes are given a letter lawmaking. Phylum Actinobacteria: (a) Actinomycetaceae, (b) Coriobacteriaceae; Phylum Bacteroidetes: (c) Barnesiellaceae, (d) Odoribacteraceae, (east) Paraprevotellaceae, (f) Porphyromonadaceae, (g) Prevotellaceae, (h) Rikenellaceae; Phylum Firmicutes: (i) Carnobacteriaceae, (j) Clostridiaceae, (k) Erysipelotrichaceae, (l) Eubacteriaceae, (m) Lachnospiraceae, (northward) Lactobacillaceae, (o) Mogibacteriaceae, (p) Peptococcaceae, (q) Peptostreptococcaceae, (r) Ruminococcaceae, (s) Streptococcaceae, (t) Tissierellaceae, (u) Turicibacteraceae, (v) Unclassified Clostridiales, (west) Veillonellaceae; Phylum Proteobacteria: (ten) Alcaligenaceae, (y) Enterobacteriaceae, (z) Oxalobacteraceae, (aa) Pasteurellaceae, (ab) Unclassified RF32; Phylum Verrucomicrobia: (ac) Verrucomicrobiaceae. Relates to Figure S4.

Christensenellaceae associates with a low BMI

The family Christensenellaceae was significantly enriched in subjects with a lean BMI (< 25) compared to those with an obese BMI (> thirty; Benjamini-Hochberg corrected P value < 0.05 from t-examination on transformed counts; Tabular array S2). Other members of the Christensenellaceae consortium were also enriched in lean-BMI subjects: the Dehalobacteriaceae, SHA-98, RF39, and the Methanobacteriaceae (Effigy 5B). Overall, a bulk (n=35) of the OTUs with highest heritability scores (A > 0.2, nominal P < 0.05) were enriched in the lean subjects. A subset of OTUs classified as Oscillospira were enriched in lean subjects, and M. smithii, though non significantly heritable, was positively associated with a lean BMI.

Christensenellaceae is associated with wellness in published datasets

Because the names Christensenella and Christensenellaceae were only recently assigned to the bacterial phylogeny, we assessed the abundances of sequences assigned to these taxa in previously published studies. This analysis revealed that members of the Christensenellaceae were enriched in fecal samples of healthy versus pediatric and immature adult IBD patients (P < 0.05) (Papa et al., 2012). Christensenellaceae were at greater abundance in lean-BMI compared to obese-BMI twins in the Turnbaugh dataset but the departure was not quite pregnant ('time-bespeak 2' samples, P = 0.07). In a case written report of the development of an infant's gut microbiome (Koenig et al., 2011), Christensenellaceae was present at viii.half-dozen% in the mother's stool at the time of birth, and at 20% in the babe's meconium. Nosotros too noted that Christensenellaceae is enriched in omnivorous compared to herbivorous and cannibal mammals (Muegge et al., 2011). However, nosotros did not find a relationship between Christensenellaceae and diet data in human studies (Wu et al., 2011; Martinez et al., 2010; Koren et al., 2012).

Christensenellaceae is associated with reduced weight gain in germfree mice inoculated with lean and obese human being fecal samples

Methanogens co-occurred with Christensenellaceae in this study and take been linked to low BMI in previous studies. Because of this previous clan with a low-BMI, we wanted to ensure that methanogens were present in the Christensenellaceae consortium in an initial experiment exploring its effect on weight phenotypes. Therefore, we selected 21 donors for fecal transfer to germfree mice based on BMI status (low or high) and presence or absence of the methanogen-Christensenellaceae consortium. Donors fell into ane of four categories: lean with detectable methanogens (L+), lean without methanogens (L-), obese with methanogens (O+), or obese without methanogens (O-). The abundance of Christensenellaceae positively correlated with the abundance of methanogens in donor stool (rho=0.72, P=0.0002), indicating that methanogen abundance was a skilful proxy for the methanogen-Christensenellaceae consortium.

A 16S rRNA assay of the fecal microbiomes before and after transfer to germfree mice showed that although members of the Christensenellaceae were present throughout the experiment in recipient mice (Effigy 6A), M. smithii was undetectable in the mouse fecal or cecal samples (the offset sampling was at 20hrs post-inoculation). At xx hrs post-inoculation, the microbiota had shifted dramatically in diverseness from the inoculation, simply by Day 5 had shifted back partially and remained adequately stable through 24-hour interval 21 (Figures 6B, 6C, S5A, and S5B). Abundances of Christensenella were correlated with PC3 (abundances rarefied at 55,000 sequences per sample vs. unweighted UniFrac; Spearman rho = 0.59, P < 2.ii x ten⁻¹⁶), and PC3 captured the differences betwixt the 4 donor groups (Figure 6D). Nosotros observed a tendency for Christensenella abundances as highest in the Fifty+ group and lowest in the O- group (Figure 6A), which mirrored the weight differences between those groups: the percent alter in body weights of the recipient mice was significantly lower in the L+ group compared to the O- group (Day 12, P < 0.05, t-test; Figure 6E and 6F). Cecal levels of propionate and butyrate were significantly elevated in mice receiving methanogen-positive compared to methanogen-negative microbiomes controlling for the event of donor BMI (two-way ANOVA, P < 0.05 for both SCFAs, Figures S5C-Due east). Stool free energy content was significantly higher for the methanogen-positive microbiomes at Day 12, when the per centum changes in weight were greatest (two-way ANOVA, P = 0.004, no upshot of BMI or interaction; Figure S5F). In a replicated experiment, using 21 new donors, the same weight differences were observed (a significantly lower mean weight gain for the L+ compared to the O- mouse recipients at Day 10 post-inoculation; one-way t-test, P = 0.047; Figure S5G).

Fecal transplants from obese and lean UK Twins to germfree mice reveal levels of Christenenallaceae post-transfer mirror delayed weight gain

A: Median relative abundances for OTUs classified as the genus Christensenella in the four donor treatment groups over fourth dimension in the recipient mouse microbiotas. B: Principal coordinates analysis of unweighted UniFrac distances for (i) the inoculum prior to transplantation, (2) fecal samples at four fourth dimension points, and (3) cecal samples at Day 21 post-transplant; see panel legend for color key. The amount of variance described by the first 2 PCs is shown on the axes. C: Richness (Faith's PD) for the microbiomes of the transplant mice plotted against time (days post inoculation, with Day 0 = inoculation solar day). D: The hateful values ± S.East.Thou. for PC3 derived for the same analysis as shown in panel B are plotted against time (Day 0 = inoculation day) for the four treatment groups. The amount of variance explained by PC3 is in parentheses. Eastward: Percent weight change since inoculation for germfree mouse recipients of 21 donor stools that were obtained from lean or obese donors with or without detectable Chiliad. smithii, which was used as a marker for the Christensenellaceae consortium. Ways for each handling group are plotted ± South. Eastward. K. F: Box plots for percent weight changes for the 4 groups at 24-hour interval 12 post-transplant, when maximal weight differences were observed. Letters adjacent to boxes signal meaning differences if letters are different (p < 0.05). For all panels, Dark blueish = L+, lean donor with methanogens; Light blue = Fifty-, lean donor lacking methanogens; Dark orange = O+, obese donor with methanogens; Light orange = O-, obese donor without methanogens. We repeated this experiment with a set up of 21 new mice and unique human being donors and recovered the aforementioned issue. Relates to Figure S5.

Christensenella minuta added to donor stool reduces adiposity gains in recipient mice

Based on the ascertainment that Christensenella levels in the previous experiment were similar to the weight gain patterns, we performed experiments in which a donor stool defective detectable Christensenella was amended with C. minuta and weight gain of recipient mice was monitored. One obese human being donor was selected from the 21 donors from the first transplant experiment based on its lack of detectable OTUs assigned to the genus Christensenella. At Mean solar day 21 post-gavage, mice receiving the C. minuta treatment weighed significantly less than those that received unamended stool (nested ANOVA, P < 0.05, Figure 7A). Adiposity was significantly lower for mice receiving the C. minuta treatment (nested ANOVA, P = 9.4 x x⁻⁵, Figure 7B). Energy content for stool nerveless at Twenty-four hour period 21 was not different between treatments (data non shown).

Addition of Christensenella minuta to donor stool leads to reduced weight and adiposity gains in recipient mice

A: Box plot of percent weight change for germfree mouse recipients of a single donor stool only (lacking detectable Christensenella in unrarefied 16S rRNA information) or the donor stool amended with live C. minuta. B: Box plots showing pct body fat for mice in each group at Day 21 Northward = 12 mice per treatment. C, D: Main coordinates analysis of unweighted UniFrac distances for (i) the inoculum prior to transplantation, (two) fecal samples at 5 time points post-transplant; see panel fable for colour key. The amount of variance described by the kickoff ii PCs is shown on the axes. The same data project is shown in panels C and D; sample symbols are colored by time point (C) and by treatment (D). E: Human relationship between PCs from the PCoA analysis and levels of Oscillospira at 24-hour interval 21 (rho = −0.71, P = P < 0.001). Symbols are colored past treatment. Relates to Figure S6.

Analysis of the microbial community by 16S rRNA gene sequencing showed an impact on the overall community diversity that persisted over time (Figure 7C, D). Subsequently an initial acclimation (20 h), the communities inside recipient mice began to dissever by treatment regardless of the effects of fourth dimension and co-caging (Figures 7C, D and S6). At 5 days post-inoculation, the relative abundance of C. minuta was similar to that observed in the previous transplant experiment and persisted throughout the duration of the study. Nosotros identified two genera that discriminated the ii treatments at Mean solar day 21: Oscillospira and a genus within the Rikenellaceae were enriched in the C. minuta treatment (misclassification mistake rate of 0.06). Oscillospira abundances were significantly correlated with PC2 in the unweighted UniFrac assay of the communities (rho = −0.71, P = 0.0009; Figure 7E), which is the PC that separates the C. minuta-amended and unamended microbiotas.

Discussion

Our results represent the starting time strong testify that the abundances of specific members of the gut microbiota are influenced in role by the genetic makeup of the host. Earlier studies using fingerprinting approaches likewise reported host genetic effects (Stewart et al., 2005; Zoetendal et al., 2001), but without sequence data it is non possible to know if the taxa shown here to be heritable were also driving those patterns. The Turnbaugh et al. and Yatsunenko et al. studies, which are quite similar in experimental approach, reported a lack of host genetic result on the gut microbiome, most likely because both studies were underpowered. However, re-analysis of the information from both studies validated our observation that the abundances of taxa are more than highly correlated within MZ than DZ twin pairs. Thus, host genetic interactions with specific taxa are likely widespread beyond man populations, with profound implications for human biological science.

The virtually highly heritable taxon in our dataset was the family Christensenellaceae, which was likewise the hub of a co-occurrence network that includes other taxa with high heritability. A notable component of this network was the archaeal family Methanobacteriaceae. Similarly, Hansen et al. had previously identified members of the Christensenellaceae (reported as relatives of Catabacter) as co-occurring with Grand. smithii (Hansen et al., 2010). These co-occurrence patterns could derive from dissimilar scenarios: for instance, multiple taxa may be heritable and co-occur while each taxon is affected by host genetics independently, or alternatively 1 (or a few) taxa may exist heritable and other taxa correlate with host genetics due to their co-occurrence with these key heritable taxa. Further experimental research will exist required to elucidate if the co-occurring heritable taxa collaborate in syntrophic partnerships or simply respond similarly to host-influenced environmental cues in the gut.

Our results suggest that environmental factors mostly shape the Bacteroidetes community, since most were not heritable. These results are consistent with those of a recent study of Finnish MZ twins, in which levels of Bacteroides spp. were more similar between twins when their diets were similar (Simoes et al., 2013). Members of the Bacteroidetes have been shown to respond to nutrition interventions (Wu et al., 2011; David et al. 2013)

Importantly, the family Christensenellaceae is heritable in the Yatsunenko dataset and its network is too present. This validation did not involve a directed search using the taxa identified in this report but was fabricated by applying the ACE model independently. In the TwinsUK also every bit the Missouri twins datasets, the majority of OTUs with the highest heritability estimates fell within the Ruminococcaceae and Lachnospiraceae families. The Missouri and TwinsUK studies differed somewhat in the levels and structure of heritability, which may relate to report size (Kuczynski et al., 2010), participant age (Claesson et al., 2011), population (Yatsunenko et al., 2012), and/or diet (Wu et al., 2011), all of which have been shown to affect microbiome structure.

The high heritability of the Christensenellaceae raises questions about the nature of interactions between the host and members of this family unit, simply to date there is little published work with which to infer their roles. Christensenella minuta is Gram-negative, non-spore forming, non-motile, and produces SCFAs (Morotomi et al., 2012). A review of publicly bachelor data suggests it is present from birth and associates with a healthy state but not with diet. Thus, although diet is a heritable trait in the same population (Menni et al., 2013; Teucher et al., 2007), it does not appear to exist driving the heritability of the Christensenellaceae. Obesity is besides strongly heritable in the TwinsUK population, raising the question of whether the heritabilities we saw for gut microbes were driven past BMI. To examination this, nosotros reran the heritability calculations using residuals afterwards regressing out the effect of BMI and constitute that results of the two analyses were highly correlated. This suggests that the effect of host genetics on Christensenellaceae abundance is contained of an effect of BMI.

Our transplantation experiments showed a moderating effect of methanogen-presence in the homo donor on weight gain of recipient mice, although strikingly, Chiliad. smithii did not persist in mice. In dissimilarity, Christensenellaceae levels in mice mirrored their weight gain. Transfer to germfree mice of microbiomes from obese and lean donors more often than not results in greater adiposity gains for obese compared to lean donors (Ridaura et al., 2013; Turnbaugh et al., 2008; Vijay-Kumar et al., 2010). These studies have non reported the methanogen or Christensenellaceae status of the donors, and then whether these microbes affect the host phenotype is unknown. M. smithii has been associated with a lean phenotype in multiple studies (1000000 et al., 2013; 1000000 et al., 2012; Schwiertz et al., 2010; Armougom et al., 2009; Le Chatelier, 2013), raising the possibility that methanogens are key components of the consortium for regulating host phenotype. The results of our methanogen-Christensenellaceae transfer revealed that although methanogens may exist a marker for a low BMI in humans, they are not required to promote a lean phenotype in the germfree mouse experimental model. This result suggests that methanogens may be functionally replaced by another consortium fellow member in the mouse, while the Christensenellaceae are not.

The results of the C. minuta spike-in experiments supported the hypothesis that members of the Christensenellaceae promote a lean host phenotype. Addition of C. minuta as well remodeled the variety of the community. Intriguingly, Oscillospira, which includes heritable OTUs in the TwinsUK dataset and is associated with a lean BMI, was enriched in the C. minuta-amended microbiomes. How C. minuta reshapes the customs remains to exist explored. The relatively depression levels of C. minuta and its profound effects on the community and the host may bespeak that it is a keystone taxon. Together these findings signal that the Christensenellaceae are highly heritable bacteria that tin can direct contribute to the host phenotype with which they acquaintance.

Conclusion

Host genetic variation drives phenotype variation, and this written report solidifies the notion that our microbial phenotype is too influenced by our genetic state. We accept shown that the host genetic effect varies across taxa and includes members of dissimilar phyla. The host alleles underlying the heritability of gut microbes, once identified, should allow u.s.a. to understand the nature of our clan with these health-associated bacteria, and eventually to exploit them to promote health.

Experimental Procedures

Human subjects and sample collection

Fecal samples were obtained from developed twin pair participants of the TwinsUK registry (Moayyeri, 2013). Most participants were women (only 20 men were included). Twins collected fecal samples at home, and the samples were refrigerated for upwardly to 2 days prior to their annual clinical visit at Male monarch's Higher London, at which pointed they were stored at −fourscore°C until processing.

Diversity and phylogenetic analyses

Nosotros amplified 16S rRNA genes (V4) from bulk DNA past PCR prior to sequencing on the Illumina MiSeq 2x250bp platform at Cornell Biotechnology Resource Center Genomics Facility. We performed quality filtering and assay of the 16S rRNA factor sequence data with QIIME 1.7.0 (Caporaso et al., 2010).

Predicted metagenomes

PICRUSt v1.0.0 was used to predict abundances of COGs from the OTU abundances rarefied at 10,000 sequences per sample.

Heritability estimations

Heritability estimates were calculated on the OTU abundances, taxon bins, nodes throughout the bacterial phylogenetic tree, α-diversity, and PICRUSt-predicted COGs using the structural equation modeling software OpenMx (Boker et al., 2011).

Microbiota transfer experiments

Stool samples from the Twins Uk cohort were selected as described in the main text and inoculated into 6-week sometime germ-gratuitous Swiss Webster mice via oral gavage, with one recipient mouse per fecal donor. Mice were unmarried-housed. For the Christensenella minuta addition, three experiments were conducted: In the first experiment, one treatment grouping received only donor stool inoculum, whereas the other received donor stool amended with 1 × 10⁸ C. minuta cells;for the second experiment, a heat-killed C. minuta control was added; in the third experiment, the heat-killed command was compared to live C. minuta only (no vehicle-only control). Mice were housed 4 per cage, with 3 cages per handling. In all experiments, mice were provided with autoclaved food and water advertising libitum and maintained on a 12-60 minutes light/dark cycle. Torso weight and chow consumption were monitored and fecal pellets were collected weekly. At sacrifice, adiposity was analyzed using DEXA. Body, mesenteric adipose tissue, and gonadal fat pad tissue weights were collected at this fourth dimension. Gross energy content of mouse stool samples was measured by bomb calorimetry using an IKA C2000 calorimeter (Dairy One, Ithaca, NY). Wet cecal contents were weighed and resuspended in 2% (five/v) formic acid by vortexing and measured using a gas chromatograph (HP series 6890) with flame ionization detection.

Statistical assay

Values are expressed every bit the mean ± SEM unless otherwise indicated. Full methods are described in the Supplemental Data

Supplementary Material

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Acknowledgements

We thank Wei Zhang, Sara Di Rienzi, Lauren Harroff, Largus Angenent, Hannah de Jong, Gabe Fox, Nick Scalfone, Aymé Spor, and Beth Bell for their assist. We likewise give thanks 3 anonymous reviewers for their helpful comments, and Mary-Claire King for her advice and encouragement. This work was funded by NIH RO1 DK093595, DP2 OD007444, The Cornell Centre for Comparative Population Genomics, the Wellcome Trust, and the European Customs's Seventh Framework Programme (FP7/2007-2013). The study too received support from the National Institute for Health Research (NIHR) BioResource Clinical Research Facility and Biomedical Research Centre based at Guy'due south and St Thomas' NHS Foundation Trust and King'southward Higher London. R.E.L. is a Fellow of the David and Lucile Packard Foundation and of the Arnold and Mabel Beckman Foundation; J.K.G. is a National Academy of Sciences predoctoral Fellow; Tim Spector is holder of an ERC Advanced Researcher Award; R.K. is a Howard Hughes Medical Establish Early Career Scientist.

Footnotes

Publisher's Disclaimer: This is a PDF file of an unedited manuscript that has been accepted for publication. Equally a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before information technology is published in its terminal citable form. Please note that during the product process errors may exist discovered which could affect the content, and all legal disclaimers that utilize to the journal pertain.

Writer Contributions: R.E.L. and A.Chiliad.C. supervised the written report, and J.T.B. and T.D.S. helped design study and provided comments and give-and-take. J.T.B. and T.D.S. oversaw drove of samples; J.K.G., R.E.L., O.K., J.L.South., A.C.P, J.L.W. oversaw microbial data generation; J.Yard.1000. performed the analysis with contributions from R.E.L, R.B., A.G.C., J.L.W., O.K., A.C.P, Thou.B., W.V.T. and R.K; J.K.G. and J.L.West. performed microbiota transfer experiments; J.G.Thousand., J. L.W and R.Eastward.L. prepared the manuscript, with comments from A.1000.C, T.D.S, J.T.B, R.B., and R.M.

Author Data: The 16S rRNA cistron sequences accept been deposited in the European Nucleotide Archive (ENA), European Bioinformatics Establish, with accretion numbers ERP006339 and ERP006342.

SUPPLEMENTAL INFORMATION

Supplemental Information includes Extended Experimental Procedures and data and can be found with this article online.

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Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4255478/

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