Stool microRNA profiles reflect different dietary and gut microbiome patterns in healthy individualsOriginal 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 examined whether stool microRNA (miRNA) profiles differ between vegans, vegetarians, and omnivores, and whether these differences track with gut microbial composition. The goal was to understand how diet shapes both host miRNA expression and the microbiome in healthy people.
How was it studied?
The team ran small RNA and shotgun metagenomic sequencing on stool samples from 120 healthy volunteers, split evenly across the three diets and matched for sex and age. Findings in vegans and vegetarians were checked against an independent cohort of 45 omnivores.
What did they find?
Forty-nine miRNAs were differentially expressed across the three diet groups. Two lipid-metabolism miRNAs, miR-636 and miR-4739, correlated inversely with how long someone had followed a non-omnivorous diet, regardless of age. Seventeen miRNAs correlated with nutrient intake, especially animal protein, phosphorus, and lipids, and miR-425-3p and miR-638 tracked with abundance shifts in specific gut microbial species across diets. Combining 25 miRNAs, 25 taxa, and 7 dietary nutrients distinguished the three diets with an area under the curve of 0.89.
Why it matters
The results suggest stool miRNA signatures reflect dietary lipid intake and correspond with specific microbiome shifts, pointing to lipids as a driver of host-microbe molecular interactions in the gut.