Alterations in the gut microbiota of patients with acquired immune deficiency syndromeOriginal 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 patterns of gut microbiota composition in people living with HIV/AIDS compared to HIV-uninfected healthy individuals. Stool samples were profiled by sequencing bacterial 16S rRNA genes to characterize community structure and abundance of specific taxa. The researchers also compared microbiota differences between treated and untreated HIV patients, and between patients grouped by mode of HIV transmission (homosexual versus heterosexual).
Who was studied?
The study enrolled 33 patients with HIV/AIDS from a population in South China, including 14 participants who had received highly active antiretroviral therapy (HAART) for more than 3 months and 19 who had not received treatment. A comparison group of 35 healthy controls was also enrolled. This was a cross-sectional design using stool samples collected from these participants.
What were the most important findings?
Dysbiosis was more common in patients with AIDS than in healthy controls, marked by decreased alpha-diversity. Patients with AIDS had lower mean counts of Bacteroidetes, Faecalibacterium, Prevotella, Bacteroides vulgatus, Dialister, and Roseburia inulnivorans, alongside higher mean counts of Proteobacteria, Enterococcus, Streptococcus, Lactobacillus, Lachnoclostridium, Ruminococcus gnavus, and Streptococcus vestibularis. Bacilli abundance was increased specifically in homosexual patients, while Proteobacteria abundance was higher among heterosexual patients with HIV.
What are the greatest implications of this study?
These findings reinforce that HIV/AIDS is associated with a distinct, reproducible gut dysbiosis signature involving both reduced beneficial commensals and increased pro-inflammatory or opportunistic taxa. The differences observed by transmission route and treatment status suggest that host behavioral and clinical factors may shape the gut microbiome in HIV infection beyond the virus itself. Characterizing these shifts could help identify microbial targets relevant to the gastrointestinal disease and systemic immune activation seen in AIDS.