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Gastro-intestinal and oral microbiome signatures associated with healthy aging

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Abstract

The human oral and gut microbiomes influence health via competition for a distinct niche in the body with pathogens, via metabolic capabilities that increase host digestive capacity and generate compounds engaged in signaling pathways and modulation of immune system functions. Old age alters our metabolic and regenerative capacity. Following recruitment of 65 human subjects in the age range of 70 to 82, we discerned healthy aging (HA) and non-healthy aging (NHA) cohorts discordant in the occurrence of one or more major diseases: (1) cancer, (2) acute or chronic cardiovascular diseases, (3) acute or chronic pulmonary diseases, (4) diabetes, and (5) stroke or neurodegenerative disorders. We analyzed these cohorts’ oral microbiomes (saliva) and gut microbiomes (stool) to assess diversity and identify microbial biomarkers for HA. In contrast to the gut microbiome where no change was observed, we found that the saliva microbiome had higher α-diversity in the HA compared with the NHA group. We observed the genus Akkermansia to be significantly more abundant in the gut microbiota of the HA group. Akkermansia muciniphila is a colonic mucin-degrading bacterium believed to have beneficial effects on gastrointestinal health, particularly in the context of diabetes and obesity. Erysipelotrichaceae UCG-003 was a taxon increased in abundance in the HA cohort. Streptococcus was the only genus observed to be significantly decreased in abundance in both the gut and oral microbiomes of the HA cohort compared with the NHA cohort. Our data support the notion that these microbes are potential probiotics to decrease the risks of non-healthy aging.

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Acknowledgments

We thank Mr. Zachary Gortler (Danbury Hospital) and Mrs. Tamara Tsitrin (J. Craig Venter Institute) for their contributions to coordinate specimen collection, shipment, cataloging samples, and generating aliquots for laboratory analysis.

Funding

This work was generously funded by the Ruggles Family Foundation, Moline, IL, and Mr. and Mrs. Rudy Ruggles.

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Authors

Contributions

Harinder Singh: microbiome data analysis and interpretation, manuscript writing; Manolito G Torralba, led DNA library preparation work; K. Moncera, generated DNA libraries; Joann Petrini, directed human subject enrolment, questionnaires on medical history, sample collections, and human subject protocols; Lauren DiLello, coordinated human subject enrolment; Karen E. Nelson, project conception and design and manuscript review; Rembert Pieper, project conception, directed the study over all, wrote manuscript, and interpreted data.

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Correspondence to Harinder Singh or Rembert Pieper.

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The authors declare that they have no conflicts of interest.

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The funding bodies did not have a role in study design, data collection and analysis, decision to publish, and preparation of the manuscript.

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Singh, H., Torralba, M.G., Moncera, K.J. et al. Gastro-intestinal and oral microbiome signatures associated with healthy aging. GeroScience 41, 907–921 (2019). https://doi.org/10.1007/s11357-019-00098-8

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  • DOI: https://doi.org/10.1007/s11357-019-00098-8

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