Expanding the human gut microbiome atlas of AfricaOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
This study examined the human gut microbiome across diverse African populations using shotgun metagenomic sequencing. It aimed to characterize how geography, lifestyle, and environmental factors shape gut microbial composition in regions underrepresented in prior microbiome research. The researchers also assembled bacterial genomes directly from the metagenomic data and looked for microbiome signatures associated with HIV infection.
Who was studied?
The AWI-Gen 2 Microbiome Project sampled 1,801 women from Burkina Faso, Ghana, Kenya, and South Africa. The cohort spanned a wide range of community settings, from rural and horticultural communities to post-industrial and urban informal settlements. This design was intended to capture a breadth of population diversity not typically represented in large-scale gut microbiome studies, which have historically underrepresented low- and middle-income countries.
What were the most important findings?
The study identified taxa with clear geographic and lifestyle associations, including loss of Treponema and Cryptobacteroides species and gain of Bifidobacterium species in urban populations. The researchers assembled 1,005 bacterial metagenome-assembled genomes from the dataset. They also found evidence that antibiotic susceptibility may drive the absence of Treponema succinifaciens in urban populations. Additionally, an HIV infection signature was identified, defined by several taxa, including Dysosmobacter welbionis and Enterocloster species, not previously linked to HIV.
What are the greatest implications of this study?
This work represents the largest population-representative survey of the gut microbiome in Africa, expanding the global microbiome atlas beyond historically overrepresented, industrialized populations. The urbanization-linked taxa shifts suggest that lifestyle transitions, including antibiotic exposure, can rapidly reshape the gut microbiome. The discovery of a novel HIV-associated taxa signature, involving organisms not previously implicated, opens new avenues for investigating host-microbiome interactions in HIV infection across diverse global populations.