We found that deletion of csgD in the WT strain did not have a substantial impact on the phenotypes tested in this study, especially with almost no effect on swimming motility, auto-aggregation, and predation resistance; on the contrary, overexpression of csgD had an extremely significant effect on the phenotypes of WT, almost consistent with what was observed in the WTΔ rfbP .
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Tetrahymena predation drives adaptive evolution of Salmonella by disrupting O-antigen biosynthesis and upregulating transcriptional regulator csgD.
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