The dynamics of the gut microbiota in prediabetes during a four-year follow-up among European patients-an IMI-DIRECT prospective studyOriginal 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 tracked gut microbiota changes over four years in 486 European patients with prediabetes, part of the IMI-DIRECT cohort. They examined whether shifts in the microbiome tracked with worsening metabolic health.
How was it studied?
Shotgun metagenomic sequencing profiled gut bacteria and viruses at baseline and after four years, using identical bioinformatics pipelines. The same phenotyping protocols measured fasting and OGTT glucose and insulin, insulin sensitivity indices, body mass index, waist circumference, and blood pressure at both timepoints.
What did they find?
Bacterial and viral species richness and microbial pathway richness significantly declined over four years, with changes in relative abundance and genetic composition of multiple bacterial species and diminished bacterial-viral interactions. Still, 80 core bacterial species and 78 core microbial pathways persisted in 99 percent of individuals at both timepoints. Glycemia and insulinemia rose while insulin sensitivity declined, and microbiota dynamics correlated significantly with these metabolic changes.
Why it matters
The findings show the gut microbiome keeps changing substantially even years into prediabetes, in step with worsening glucose control. The authors note it remains unsettled whether these microbial shifts drive metabolic decline or simply reflect it.