Large Comparative Analyses of Primate Body Site Microbiomes Indicate that the Oral Microbiome Is Unique among All Body Sites and Conserved among Nonhuman Primates.
Level 5 - mechanism / opinion, no new human data
Level 5 by design analogy (comparative non-human animal research)
PubMed 35587638 · doi:10.1128/spectrum.01643-21
What was done
Microbiome community compositions were profiled and compared across 8 distinct anatomical body sites among 17 phylogenetically diverse nonhuman primate species. The analysis evaluated 898 microbial samples acquired predominantly from wild populations to assess patterns of variation and clustering across host species, body sites, and individuals.
What was found
The abstract does not report specific numerical metrics, alpha/beta diversity indices, or p-values. Across 898 samples, oral microbiomes formed a distinct cluster showing marked divergence from all other body sites and high conservation across diverse primate species despite dietary and phylogenetic variation. In contrast, microbiomes from the other seven body sites clustered primarily by host species rather than by anatomical niche, differentiating by body site secondarily within each species.
Why it matters
These findings demonstrate that the primate oral microbiome occupies a uniquely specialized and evolutionary conserved niche across host lineages. Understanding these baseline biogeographical patterns clarifies how mammalian host-microbial relationships evolved and contextualizes human microbiome research.
Limits
The abstract provides no quantitative statistics, effect sizes, taxonomic resolution, or sequencing methods. The total number of unique individual animals sampled is not stated (only the total sample count of 898 is given). Because samples were collected largely from wild animals, unmeasured environmental, dietary, and seasonal factors could introduce uncontrolled variability.
Cited by
- supports The bacterial composition of the oral microbiome is distinct from and not similar to the gut/digestive microbiome.