Cited by 115Oral microbiology and periodontitis researchMicrobial Community Ecology and PhysiologyGut microbiota and health

A spatial gradient of bacterial diversity in the human oral cavity shaped by salivary flow

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Proctor, Diana M., Fukuyama, Julia A., Loomer, Peter M., Armitage, Gary C., Lee, Stacey A., Davis, Nicole M., Ryder, Mark I., Holmes, Susan P. +1 more·2018·Nature Communications

Abstract

Spatial and temporal patterns in microbial communities provide insights into the forces that shape them, their functions and roles in health and disease. Here, we used spatial and ecological statistics to analyze the role that saliva plays in structuring bacterial communities of the human mouth using >9000 dental and mucosal samples. We show that regardless of tissue type (teeth, alveolar mucosa, keratinized gingiva, or buccal mucosa), surface-associated bacterial communities vary along an ecological gradient from the front to the back of the mouth, and that on exposed tooth surfaces, the gradient is pronounced on lingual compared to buccal surfaces. Furthermore, our data suggest that this gradient is attenuated in individuals with low salivary flow due to Sjögren’s syndrome. Taken together, our findings imply that salivary flow influences the spatial organization of microbial communities and that biogeographical patterns may be useful for understanding host physiological processes and for predicting disease.

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  • Variation in the amount and velocity of salivary flow experienced by these sites, dictated by proximity to salivary glands, affects the composition of microbial communities harbored in distinct niches.

    “Variation in the amount and velocity of salivary flow experienced by these sites, dictated by proximity to salivary glands, affects the composition of microbial communities harbored in distinct niches.231”
  • The oral cavity as a microbial environment is complicated by spatial gradients created by salivary flow, nutrient availability, oxygen concentration, saliva, and gingival crevicular fluids, in addition to regular environmental disturbances caused by eating and mastication, facial movement related to speaking and expression, and oral hygiene practices.

    “The oral cavity as a microbial environment is further complicated by spatial gradients created by salivary flow, nutrient availability, oxygen concentration, saliva, and gingival crevicular fluids,61, 227, 231, 232 in addition to regular environmental disturbances caused by eating and mastication, facial movement related to speaking and expression, and oral hygiene practices.227”

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Authors
Proctor, D. M., Fukuyama, J. A., Loomer, P. M., Armitage, G. C., Lee, S. A., Davis, N. M., Ryder, M. I., Holmes, S. P., & Relman, D. A.
Affiliations
  • University of California, San Francisco (US)
  • Fred Hutch Cancer Center (US)
  • Stanford Medicine (US)
  • Stanford University (US)
  • VA Palo Alto Health Care System (US)
Corresponding author
Relman, David A.
Venue
Nature Communications
Published
2018-02-14
Volume
9
Issue
1
Pages
681-681
ISSN
2041-1723 (ISSN-L)
OpenAlex
W2801640552
Cited by
115
References
62
Citations by year
2026: 8 · 2025: 13 · 2024: 8 · 2023: 10 · 2022: 12 · 2021: 24 · 2020: 23 · 2019: 11 · 2018: 6
FWCI
18.39
Type
journal article
Language
en
Open access
Locations
  • Nature Communications (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • eScholarship (California Digital Library) (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
  • IUScholarWorks Open (Indiana University) (submittedVersion)
Funders
  • National Institutes of Health (DP1OD000964)
  • National Institute of General Medical Sciences (T32GM007276)
  • National Institute of Allergy and Infectious Diseases (T32AI007328)
  • National Institute of Dental and Craniofacial Research (R01DE023113)
  • Division of Graduate Education
Topics
  • Health Sciences › Dentistry › Periodontics › Oral microbiology and periodontitis research
  • Physical Sciences › Environmental Science › Ecology › Microbial Community Ecology and Physiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
Keywords
oral microbiota, salivary flow, spatial gradients, bacterial diversity, Sjögren's syndrome, dental plaque, oral mucosa, biogeography, microbial community structure, tooth surface
MeSH terms
Adult, Aged, Bacteria, Female, Humans, Male, Middle Aged, Mouth, Mouth Mucosa, RNA, Ribosomal, 16S, Saliva, Salivation, Sjogren's Syndrome, Tongue, Tooth, Genetic Variation, Xerostomia, Biodiversity, Young Adult

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