The human distal gut harbours a vast ensemble of microbes (the microbiota) that provide important metabolic capabilities, including the ability to extract energy from otherwise indigestible dietary polysaccharides1,2,3,4,5,6. Studies of a few unrelated, healthy adults have revealed substantial diversity in their gut communities, as measured by sequencing 16S rRNA genes6,7,8, yet how this diversity relates to function and to the rest of the genes in the collective genomes of the microbiota (the gut microbiome) remains obscure. Studies of lean and obese mice suggest that the gut microbiota affects energy balance by influencing the efficiency of calorie harvest from the diet, and how this harvested energy is used and stored3,4,5. Here we characterize the faecal microbial communities of adult female monozygotic and dizygotic twin pairs concordant for leanness or obesity, and their mothers, to address how host genotype, environmental exposure and host adiposity influence the gut microbiome. Analysis of 154 individuals yielded 9,920 near full-length and 1,937,461 partial bacterial 16S rRNA sequences, plus 2.14 gigabases from their microbiomes. The results reveal that the human gut microbiome is shared among family members, but that each person’s gut microbial community varies in the specific bacterial lineages present, with a comparable degree of co-variation between adult monozygotic and dizygotic twin pairs. However, there was a wide array of shared microbial genes among sampled individuals, comprising an extensive, identifiable ‘core microbiome’ at the gene, rather than at the organismal lineage, level. Obesity is associated with phylum-level changes in the microbiota, reduced bacterial diversity and altered representation of bacterial genes and metabolic pathways. These results demonstrate that a diversity of organismal assemblages can nonetheless yield a core microbiome at a functional level, and that deviations from this core are associated with different physiological states (obese compared with lean).
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This Whole Genome Shotgun project is deposited in DDBJ/EMBL/GenBank under accession number 32089. 454 pyrosequencing reads are deposited in the NCBI Short Read Archive. Nearly full-length 16S rRNA gene sequences are deposited in GenBank under accession numbers FJ362604–FJ372382. Annotated sequences are also available in MG-RAST (http://metagenomics.nmpdr.org/). 454-generated 16S rRNA sequences with sample identifiers are also available at http://gordonlab.wustl.edu/SuppData.html.
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We thank: S. Wagoner and J. Manchester for technical support; S. Marion and D. Hopper for recruitment of participants and sample collection; A. Goodman, B. Muegge, and M. Mahowald for suggestions; S. Huse (Marine Biological Laboratory), F. Niazi and S. Attiya (454 Life Sciences), C. Markovic, L. Fulton, B. Fulton, E. Mardis and R. Wilson (Washington University Genome Sequencing Center) and S. Macmil, G. Wiley, C. Qu, and P. Wang (University of Oklahoma) for their assistance with sequencing; and P. M. Coutinho (Université de Provence, France) for help with the CAZy analysis. Deep draft assemblies of reference gut genomes were generated as part of a National Human Genome Research Institute (NHGRI)-sponsored human gut microbiome initiative (http://genome.wustl.edu/pub/organism/Microbes/Human_Gut_Microbiome/). This work was supported in part by the National Institutes of Health (DK78669/ES012742/AA09022/HD049024), the National Science Foundation (OCE0430724), the W.M. Keck Foundation, and the Crohn’s and Colitis Foundation of America.
Author Contributions P.J.T., A.C.H., R.K. and J.I.G. designed the experiments. P.J.T., T.Y., A.D., R.E.L., M.L.S., W.J.J., B.A.R., J.P.A. and M.E. generated the data. P.J.T., M.H., M.L.S., B.L.C., A.D., B.H., A.C.H., R.K. and J.I.G. analysed the data. P.J.T., A.C.H., R.K. and J.I.G. wrote the manuscript with input from the other members of the team.
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Turnbaugh, P., Hamady, M., Yatsunenko, T. et al. A core gut microbiome in obese and lean twins. Nature 457, 480–484 (2009). https://doi.org/10.1038/nature07540
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