interactions may play an important role in human health and behavior. Although rodent models have demonstrated effects of the gut microbiota
on emotional, nociceptive, and social behaviors, there is little translational human evidence to date. In this study, we identify brain and behavioral characteristics of healthy women clustered by gut microbiota
Forty women supplied fecal samples for 16S rRNA profiling. Microbial clusters were identified using Partitioning Around Medoids. Functional magnetic resonance imaging was acquired. Microbiota
-based group differences were analyzed in response to affective images. Structural and diffusion tensor imaging provided gray matter metrics (volume, cortical thickness, mean curvature, surface area) as well as fiber density between regions. A sparse Partial Least Square-Discrimination Analysis was applied to discriminate microbiota
clusters using white and gray matter metrics.
Two bacterial genus-based clusters were identified, one with greater Bacteroides
= 33) and one with greater Prevotella
= 7). The Prevotella
group showed less hippocampal activity viewing negative valences images. White and gray matter imaging discriminated the two clusters, with accuracy of 66.7% and 87.2%, respectively. The Prevotella
cluster was associated with differences in emotional, attentional, and sensory processing regions. For gray matter, the Bacteroides
cluster showed greater prominence in the cerebellum, frontal regions, and the hippocampus
These results support the concept of brain-gut-microbiota
interactions in healthy humans. Further examination of the interaction between gut microbes, brain, and affect in humans is needed to inform preclinical reports that microbial modulation may affect mood and behavior.