HIV-associated gut dysbiosis is independent of sexual practice and correlates with noncommunicable diseasesOriginal 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 examined whether gut microbiota alterations previously linked to HIV are actually explained by sexual practice, since sexual practice is a known source of microbiota variation. The researchers compared gut microbiota composition between antiretroviral-treated persons with HIV (PWH) and seronegative controls, using a design that matched participants for age, body-mass index, sex, and sexual practice to remove these as confounders. They then related the resulting HIV-associated microbiota pattern to inflammatory markers and age-associated noncommunicable comorbidities.
Who was studied?
Participants were drawn from the AGEhIV Cohort, specifically a well-powered subset of antiretroviral-treated PWH and HIV-seronegative controls. Controls were matched to the PWH group for age, body-mass index, sex, and sexual practice, including men who have sex with men (MSM) and individuals reporting receptive anal intercourse. The abstract does not give an exact number of participants.
What were the most important findings?
Gut microbiota differences in PWH were significant regardless of sex and sexual practice, including enrichment of Gammaproteobacteria, depletion of Lachnospiraceae and Ruminococcaceae, and decreased alpha diversity. Separately, MSM showed a distinct microbiota signature marked by Prevotella enrichment and increased alpha diversity, which was linked to receptive anal intercourse in both males and females. The HIV-associated microbiota signature also correlated with inflammatory markers such as suPAR, with nadir CD4 count, and with the prevalence of age-associated noncommunicable comorbidities.
What are the greatest implications of this study?
By matching for sexual practice, the study shows that HIV-associated gut dysbiosis is not simply a byproduct of sexual behavior but a distinct feature of treated HIV disease itself. The depletion of commensal families like Lachnospiraceae and Ruminococcaceae alongside Gammaproteobacteria enrichment suggests a loss of beneficial gut bacteria that coincides with inflammation and comorbidity risk. This supports the idea that gut microbiota alterations in PWH are clinically relevant markers linked to chronic inflammation and noncommunicable disease burden, separate from sexual practice-related signatures like the Prevotella-enriched MSM pattern.