Clinical severity score-guided metagenomic analysis identifying gut microbial taxonomic and functional markers for severe hepatitis E progression.

Gut microbiome alterations, especially enrichment of Veillonella atypica, are strongly linked to hepatitis E severity with an AUC of 0.944 in discriminating patients from controls.

• Why it matters: Understanding microbiome determinants of hepatitis E severity is crucial because the role of gut microbes across the disease spectrum remains poorly defined, limiting potential diagnostic and therapeutic advances.
• What they did: Shotgun metagenomic sequencing was performed on fecal samples from 125 individuals with varying hepatitis E severity, and an integrative framework combining XGBoost and LASSO identified microbial taxonomic and functional markers associated with disease severity.
• The result: The study found a microbiome signature characterized by lactate-utilizing bacteria and depletion of beneficial commensals, with a core set of 16 KOs explaining 61% of variance in severity, suggesting a strong link between microbial lactate metabolism and hepatitis E progression.