In Vivo Transcriptional Profiling of Listeria monocytogenes and Mutagenesis Identify New Virulence Factors Involved in Infection
Figure 1
(A) Analysis of the impact of the in vitro culture conditions used as reference. The expression of known and potential virulence factors was analyzed in BHI at 37°C in exponential (BHI log) or stationary (BHI stat) growth phase, or in minimal medium in exponential growth phase (MM log) by real-time RT-PCR, and normalized to expression in mouse spleen. (B) Validation of macroarray data by real-time RT-PCR. Fold changes in in vivo gene expression 48 h p.i. compared to that in BHI were measured by macroarray and real-time RT-PCR, log transformed and compared for correlation analysis. (C) Analysis of the effect of the RNA extraction method on L. monocytogenes gene expression. RNAs from bacteria grown in BHI were prepared using the standard and adapted procedures for RNA extraction. The relative expression of potential virulence genes, cold shock genes and known virulence genes was determined by real-time RT-PCR.