Factors that drive variation among gut microbial communities

Area of Science:

• Microbiology
• Primatology
• Evolutionary Biology

Background:

• Human gut microbiota varies geographically, but distinguishing genetic from environmental influences is challenging due to shared ancestry and lifestyle.
• Understanding factors shaping gut microbial communities is crucial for human health and disease.

Purpose of the Study:

• To investigate the relative contributions of heritable and external factors to gut microbiota composition in chimpanzees.
• To leverage chimpanzee populations to control for heritable factors and isolate the impact of external influences on gut microbes.

Main Methods:

• Analysis of gut microbial communities in geographically separated chimpanzee populations in Gombe Stream National Park.
• Comparative analysis to differentiate heritable versus external influences on microbiota composition.

Main Results:

• Differences in gut microbiota composition between separated chimpanzee groups are predominantly driven by external factors.
• The contribution of heritable factors to gut microbiota variation within chimpanzees is negligible.
• External factors like diet, geography, and cultural practices are the primary drivers of gut microbial diversity.

Conclusions:

• External factors exert a dominant influence on gut microbiota composition in chimpanzees, our closest living relatives.
• The findings support the potential for manipulating the human gut microbiome by altering environmental factors.
• Controlled studies are essential to pinpoint specific external factors influencing gut microbiota composition.