Strain-level heterogeneity in Vibrio parahaemolyticus limits the predictive value of baseline planktonic gene expression for surface-associated phenotypes

Description

Xia Huang, Thomas Alter, Roswitha Merle, and Vanessa Szott deliver a blunt result in 2026 for anyone predicting bacterial behaviour from gene activity. Vibrio parahaemolyticus, a marine bacterium behind seafood poisoning, swims, sticks, and builds biofilms depending on conditions. Researchers often read its genes while it floats freely and assume the reading forecasts those surface behaviours. Across a diverse panel of strains, that assumption failed.

Traits and gene expression both varied widely by strain. Once multiple-testing corrections were applied, no robust links tied expression levels to surface phenotypes, and predictive models performed worse than guessing the average. Family-tree style analysis confirmed strain identity dominating the variation. The authors argue that studies pooling strains or reading the wrong growth condition will keep making false confidence, and that a strain-level, condition-matched measure is the honest route.

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Source: https://europepmc.org/article/MED/PMC13408953