The importance of commensal microbes for human health is increasingly recognized1,2,3,4,5, yet the impacts of evolutionary changes in human diet and culture on commensal microbiota remain almost unknown. Two of the greatest dietary shifts in human evolution involved the adoption of carbohydrate-rich Neolithic (farming) diets6,7 (beginning ∼10,000 years before the present6,8) and the more recent advent of industrially processed flour and sugar (in ∼1850)9. Here, we show that calcified dental plaque (dental calculus) on ancient teeth preserves a detailed genetic record throughout this period. Data from 34 early European skeletons indicate that the transition from hunter-gatherer to farming shifted the oral microbial community to a disease-associated configuration. The composition of oral microbiota remained unexpectedly constant between Neolithic and medieval times, after which (the now ubiquitous) cariogenic bacteria became dominant, apparently during the Industrial Revolution. Modern oral microbiotic ecosystems are markedly less diverse than historic populations, which might be contributing to chronic oral (and other) disease in postindustrial lifestyles.
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We thank D. Brothwell for original inspiration, N. Gully and S. Bent for critical discussions and J. Soubrier for bioinformatics assistance. We thank H. Meller from the State Heritage Museum of Saxony-Anhalt, Germany, and W. Gumiński from the Institute of Archaeology, University of Warsaw, Poland, for prehistoric samples and members of the Australian Centre for Ancient DNA for practical help and providing samples of plaque and calculus. We thank several anonymous reviewers whose comments have considerably improved the manuscript. We thank the Australian Research Council, the Wellcome Trust (WT092799/Z/10/Z and WT098051) and the Sir Mark Mitchell Foundation for funding support.
The authors declare no competing financial interests.
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Adler, C., Dobney, K., Weyrich, L. et al. Sequencing ancient calcified dental plaque shows changes in oral microbiota with dietary shifts of the Neolithic and Industrial revolutions. Nat Genet 45, 450–455 (2013). https://doi.org/10.1038/ng.2536
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