Shared Ancestral Gut Microbes Discovered
Researchers found that the Hadza and Tsimane peoples share 1,200 gut bacterial species inherited from common ancestors.
Updated on Oct. 8, 2026 in Life Sciences
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A study comparing gut health in the Hadza of Tanzania and the Tsimane of Bolivia revealed a 90% overlap in their microbial populations. Scientists suggest these specific bacterial strains have been passed down through human generations for approximately 17,000 years.
Why it matters
The persistence of these ancestral microbes across isolated global populations provides critical insight into the evolution of human immunity and digestion. Understanding these shared strains may reveal why modern, industrialized populations have lost essential microbial diversity.
Researchers identified 1,200 shared bacterial species in populations living 7,000 miles apart. Genetic dating suggests these strains have been maintained for 17,000 years, with 60% of these microbes missing in industrialized humans.
The players
Hadza
An indigenous ethnic group living in northern Tanzania that relies primarily on foraging for their diet.
Tsimane
An indigenous group residing in the Bolivian Amazon who maintain traditional lifestyle practices.
The details
By analyzing stool samples from the Tanzanian Hadza and the Bolivian Tsimane, researchers determined that microbial profiles were transmitted from common ancestors in Africa. These bacteria co-evolved alongside humans before migration separated the groups, effectively serving as an ancient biological legacy.
Timeline
The ancestral microbial strains originated approximately 17,000 years ago.
The Big Picture
The study expands upon the foundational diversity data established by the Human Microbiome Project by documenting ancestral strains absent in modern clinical cohorts. This discovery challenges previous assumptions regarding the rate of microbial loss during human evolution.
This research suggests that the gut microbiomes of modern, industrialized populations may be missing beneficial ancestral bacteria that aid in immune function. Future findings could lead to new medical interventions aimed at restoring these lost strains to combat inflammatory conditions.
The takeaway
These findings underscore that many aspects of human health are dictated by a long-standing microbial legacy rather than just modern environment. Maintaining biological diversity through these ancestral strains remains a key focus for researchers studying human immunity.
Further reading
Explore more studies on human biology in our Life Sciences section.
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