Gut microbiome dysbiosis and correlation with blood biomarkers in active-tuberculosis in endemic settingOriginal 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 gut microbiome dysbiosis in active tuberculosis and how it relates to blood immune biomarkers in an endemic setting. Stool bacteria were profiled by 16S ribosomal RNA gene sequencing of the V4 region. Butyrate-producing capacity was measured through bcoA gene copy number by quantitative PCR. Plasma antibodies against 11 Mycobacterium tuberculosis antigens were measured by multiplex immunoassay, then correlated with enriched bacterial genera using Spearman analysis.
Who was studied?
The study enrolled 82 adults in Lahore, Pakistan, between January and June 2017. There were 42 smear-positive, HIV-negative active tuberculosis patients (median age 27) and 40 healthy controls (median age 40) from the same region. Males outnumbered females in both groups. Most patients had classic symptoms: cough (98%), fever (86%), night sweats (76%), and weight loss (76%). Ten patients also had diabetes.
What were the most important findings?
Three phyla were enriched in tuberculosis patients: Fusobacteria rose about 4-fold (p < 0.01), Actinobacteria about 2-fold (p < 0.001), and Firmicutes modestly (p < 0.01). Beneficial Bacteroidetes and Tenericutes were reduced (p < 0.05 and p < 0.001). Gut community structure separated clearly between patients and controls. The butyrate-synthesis gene bcoA fell about five-fold in patients (median 111.8 vs 515.05 copies, p = 0.004). Plasma antibodies against several M. tuberculosis antigens correlated closely with patient-enriched genera.
What are the greatest implications of this study?
The findings suggest active tuberculosis is accompanied by broad gut dysbiosis favoring pro-inflammatory and pathobiont taxa over beneficial commensals. A roughly five-fold drop in butyrate-synthesis gene copies implies reduced production of a metabolite central to gut barrier and epithelial energy, which may compound weight loss and morbidity. Because patient-enriched bacteria correlated with disease-specific antibodies, the authors suggest gut microbiota could complement blood biomarkers. As an observational study, it cannot prove the dysbiosis drives tuberculosis.