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- W4387666064 endingPage "e3002338" @default.
- W4387666064 startingPage "e3002338" @default.
- W4387666064 abstract "Bacteria commonly adhere to surfaces where they compete for both space and resources. Despite the importance of surface growth, it remains largely elusive how bacteria evolve on surfaces. We previously performed an evolution experiment where we evolved distinct Bacilli populations under a selective regime that favored colony spreading. In just a few weeks, colonies of Bacillus subtilis showed strongly advanced expansion rates, increasing their radius 2.5-fold relative to that of the ancestor. Here, we investigate what drives their rapid evolution by performing a uniquely detailed analysis of the evolutionary changes in colony development. We find mutations in diverse global regulators, RicT, RNAse Y, and LexA, with strikingly similar pleiotropic effects: They lower the rate of sporulation and simultaneously facilitate colony expansion by either reducing extracellular polysaccharide production or by promoting filamentous growth. Combining both high-throughput flow cytometry and gene expression profiling, we show that regulatory mutations lead to highly reproducible and parallel changes in global gene expression, affecting approximately 45% of all genes. This parallelism results from the coordinated manner by which regulators change activity both during colony development-in the transition from vegetative growth to dormancy-and over evolutionary time. This coordinated activity can however also break down, leading to evolutionary divergence. Altogether, we show how global regulators function as major pleiotropic hubs that drive rapid surface adaptation by mediating parallel changes in both colony composition and expansion, thereby massively reshaping gene expression." @default.
- W4387666064 created "2023-10-17" @default.
- W4387666064 creator A5041512711 @default.
- W4387666064 creator A5048422357 @default.
- W4387666064 creator A5079730045 @default.
- W4387666064 date "2023-10-16" @default.
- W4387666064 modified "2023-10-18" @default.
- W4387666064 title "Pleiotropic hubs drive bacterial surface competition through parallel changes in colony composition and expansion" @default.
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