Distinct distal gut microbiome diversity and composition in healthy children from Bangladesh and the United StatesOriginal 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 compared the diversity, composition, and temporal stability of the distal gut (fecal) microbiota between healthy children living in two very different settings. The researchers used molecular sequencing of the 16S rRNA gene, analyzing over 8,000 near full-length sequences plus more than 845,000 pyrosequencing reads of the V1-V3 region, to characterize which bacteria were present and how communities were structured. The goal was to fill a gap in knowledge, since prior gut microbiome research had focused mostly on infants and adults in developed countries rather than older children in developing countries.
Who was studied?
The study compared healthy children ages 9 to 14 years living in an urban slum in Bangladesh with healthy children of the same age range living in an upper-middle class suburban community in the United States. Both groups were sampled for fecal bacterial community composition, and community structure was also tracked over time to assess stability. The abstract does not give an exact number of participants in each cohort.
What were the most important findings?
The distal gut microbiota of Bangladeshi children showed significantly greater bacterial diversity than that of U.S. children, including novel lineages from several bacterial phyla. Bangladeshi and U.S. children also had distinct fecal bacterial community membership and structure overall. The Bangladeshi children's microbiota was enriched in Prevotella, Butyrivibrio, and Oscillospira and depleted in Bacteroides relative to U.S. children, a pattern that was similar to what has been seen in Bangladeshi adults.
What are the greatest implications of this study?
These findings show that geography, diet, and living environment are associated with substantial differences in gut microbial diversity and composition even among healthy children of the same age. The presence of novel bacterial lineages and a distinct compositional pattern in Bangladeshi children suggests that microbiome reference data drawn mainly from developed-country populations may not generalize to children in developing countries. This underscores the need to study diverse populations and age groups, including older children and adolescents, when defining what constitutes a healthy gut microbiome.