Establishment of a non-Westernized gut microbiota in men who have sex with men is associated with sexual practicesOriginal 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?
This study used species-level shotgun metagenomic sequencing to characterize the gut microbiota of men who have sex with men (MSM). It investigated why the MSM gut microbiome, previously shown to differ from that of non-MSM, so often resembles the microbial communities seen in non-Westernized populations. The researchers also used questionnaire data and machine learning to link specific sexual practices to variation in microbiota composition among MSM.
Who was studied?
The study population was men who have sex with men of Western origin, compared against patterns typical of non-Westernized populations. The abstract does not give an exact sample size, but participants contributed both stool samples for shotgun metagenomics and questionnaire responses on sexual practices. This design allowed the authors to relate individual behavioral data to individual gut microbiome profiles within the MSM cohort.
What were the most important findings?
Many MSM with Western origin had gut microbiomes resembling those of non-Westernized populations rather than typical Western gut profiles. These microbiomes were frequently dominated by Prevotellaceae family members, including co-colonization by species from the Segatella copri complex alongside unknown Prevotellaceae members. Questionnaire analysis and machine learning further identified specific sexual practices as microbial features associated with this altered, Prevotellaceae-rich composition.
What are the greatest implications of this study?
The findings show that sexual activity itself can be a driver of major gut microbiome alterations, independent of the diet and lifestyle factors usually invoked to explain Westernized versus non-Westernized microbiota differences. Because MSM gut microbiomes can resemble non-Westernized profiles, sexual practice becomes an important variable that population-based microbiota studies may need to account for. This has implications for how researchers select and interpret control or reference populations in microbiome research and for disentangling behavioral from dietary or geographic influences on gut microbial composition.