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Uniform bacterial genetic diversity along the gut
Michael Wasney1, Leah Briscoe2, Richard Wolff3
1Human Genetics, University of California, Los Angeles, Los Angeles, CA, USA.
Nature Communications
|March 18, 2026
Summary
Bacterial species composition varies across the gut, but genetic diversity within species remains uniform. Evolutionary adaptations spread globally, indicating uniform bacterial genetics is a conserved feature in mammals.
Area of Science:
- Microbiome research
- Gut microbial ecology
- Bacterial population genetics
Background:
- Environmental gradients influence bacterial species distribution in the gastrointestinal tract.
- Spatial distribution of genetic diversity within gut bacterial species is poorly understood.
- Bacterial genetic variants impact host traits such as inflammation and metabolism.
Purpose of the Study:
- To investigate the spatial distribution of genetic diversity within common gut commensals.
- To determine if genetic diversity within bacterial species segregates along the gastrointestinal tract.
- To understand the dynamics of bacterial evolution and adaptation within the gut ecosystem.
Main Methods:
- Analysis of ~30 common gut commensals in germ-free mice colonized with human stool.
- Comparison of species composition and genetic diversity across different gut regions.
- Tracking of evolutionary adaptations and strain frequencies throughout the gut lumen.
Main Results:
- Species composition varied significantly across gut regions.
- Genetic diversity within bacterial species remained remarkably uniform across the gut.
- ~60 evolutionary adaptations swept globally throughout the gut with little region-specificity.
- Similar dynamics were observed in conventional mice and humans.
Conclusions:
- Uniform bacterial genetic diversity is a conserved and robust feature of mammalian gut ecosystems.
- Genetically divergent bacterial strains can coexist without spatial segregation in the gut.
- Bacterial adaptations tend to spread globally within the gut, irrespective of region.
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