Feeding-Related Gut Microbial Composition Associates With Peripheral T-Cell Activation and Mucosal Gene Expression in African InfantsOriginal 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?
Researchers followed 155 infants from birth in a high-HIV-prevalence, low-income setting in South Africa. They asked whether feeding pattern (exclusive versus nonexclusive breastfeeding) shapes gut microbiota in ways that could explain why exclusive breastfeeding lowers postnatal HIV transmission risk.
How was it studied?
Stool microbial communities were profiled by 16S rRNA gene sequencing, peripheral T-cell activation was measured by flow cytometry, and buccal mucosal gene expression was assessed by quantitative PCR. All infants were exclusively breastfed at birth, but only 43.5% remained so at 6 weeks and 20% at 14 weeks.
What did they find?
Exclusively breastfed infants had lower stool microbial diversity and a distinct microbial composition compared to nonexclusively breastfed infants. Specific taxa abundances correlated with peripheral CD4+ T-cell activation, which was lower in exclusively breastfed infants. In the oral mucosa, expression of chemokines, chemokine receptors, and epithelial cytoskeletal genes tied to recruiting HIV target cells was also lower in this group.
Why it matters
The findings offer a biologically plausible mechanism for exclusive breastfeeding's protection against postnatal HIV transmission: a distinct gut microbiota linked to reduced immune activation and fewer available HIV target cells at mucosal surfaces.