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Updated: Sep 12, 2025
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Guided Protocol for Fecal Microbial Characterization by 16S rRNA-Amplicon Sequencing
Published on: March 19, 2018
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Demographic drivers of gut microbiome diversity
Hannaneh Kabir1, Matilda Holtz1,2, Justine Choueiri1
1Molecular Cell Biomechanics Lab, Departments of Bioengineering and Mechanical Engineering, University of California Berkeley, Berkeley, CA, USA.
AMB Express
|August 8, 2025
Summary
Demographic factors like age and geography significantly shape the gut microbiome in healthy individuals. Sex has a minimal effect, providing crucial context for understanding disease-related microbiome changes.
Area of Science:
- Human microbiome research
- Gut health and disease
- Demographic influences on microbial ecology
Background:
- The gut microbiome is vital for human health, influencing metabolic, immune, and neurological functions.
- Research on gut microbiome composition has largely focused on diseases, with less attention paid to demographic factors.
- Understanding demographic influences is crucial for interpreting microbiome variations in disease states and for personalized medicine.
Purpose of the Study:
- To investigate the impact of key demographic variables (age, sex, geography) on gut microbiome diversity in healthy individuals.
- To establish a baseline understanding of normal microbiome variation.
- To provide a framework for contextualizing disease-associated microbiome alterations.
Main Methods:
- Utilized the comprehensive dataset from the American Gut Project.
- Employed the QIIME2 bioinformatics pipeline for microbial profile analysis.
- Analyzed gut microbiome composition and diversity across different demographic groups.
Main Results:
- Significant age-related shifts were observed in microbial richness and composition.
- Geographic location demonstrated a strong influence on phylogenetic diversity.
- Sex showed a limited impact on gut microbiome diversity among individuals with healthy BMI.
Conclusions:
- Demographic factors, particularly age and geography, are critical determinants of gut microbiome diversity in healthy populations.
- Sex has a less pronounced effect on the gut microbiome compared to age and geography in this cohort.
- These findings are foundational for advancing personalized healthcare by better contextualizing disease-related microbiome variations.
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