Cerebral small vessel disease burden is associated with decreased abundance of gut Barnesiella intestinihominis bacterium in the Framingham Heart 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 examined whether gut microbiome composition relates to cerebral small vessel disease (cSVD) markers and cognition in 972 Framingham Heart Study participants with MRI scans, neurocognitive testing, and stool samples.
How was it studied?
Gut microbiota was profiled with 16S rRNA sequencing. Multivariable association and differential abundance analyses, adjusted for age, sex, BMI, and education, linked microbial taxa to white matter hyperintensities, peak width of skeletonized mean diffusivity (PSMD), and executive function.
What did they find?
Higher Pseudobutyrivibrio and Ruminococcus abundance was associated with lower white matter hyperintensities and PSMD, and with better executive function. Barnesiella intestinihominis, a gram-negative bacterium, was consistently associated with markers of higher cSVD burden across both analyses. PICRUSt functional analysis also implicated pathways such as quorum sensing and β-hydroxybutyrate production, previously tied to cognition and dementia.
Why it matters
This cross-sectional study links specific gut bacteria to brain small vessel disease markers, a major contributor to Alzheimer's disease and related dementias, though the authors note replication is still needed.