Figure 1.

Medium- and temperature-dependent differential expression of Y. pseudotuberculosis chromosomal genes involved in virulence and/or iron uptake & storage. Significant (p < 0.05) upshifts (yellow to red scale) or downshifts (blue scale) in individual gene transcription levels when bacteria were grown in human plasma versus LB (triangles) and/or at 37°C versus 28°C (squares) are indicated by the color scale bar. Genes encoding iron uptake/storage systems, virulence factors and their regulators are symbolized by gray, white and black arrows, respectively. Nomenclature used for gene designation correspond to the Y. pseudotuberculosis IP32953 genome annotation. Mean fold changes in transcription and p-values are indicated in Table 2.