UNASSIGNED: Understanding the survival mechanisms used by Shiga toxin-producing @entity526 (STEC), including O157:H7 and non-O157 serotypes, is important for minimizing contamination of fresh produce and occurrence of foodborne outbreaks. Recent outbreaks linked to leafy green vegetables and sprouted seeds have prompted researchers to focus on investigating decontamination strategies. Several studies showed that @entity273 ( @entity5568 ) treatment has been effective in reducing pathogens on fresh produce. As such, the effect of @entity273 on stress-associated and virulence gene expression in six STEC isolates was investigated in this study. Logarithmic phase cells of @entity28493 ) and non-O157 serotypes, including E. coli O26:H11 (EC20070549), O103:H2 (EC19970811), O104:H4 (NML#11-3088), O111:NM (EC20070546) and O145:NM (EC19970355) were exposed to 2.5mM @entity5568 for 40min and gene expression was evaluated using quantitative real-time PCR. Different patterns of gene expression were observed in @entity526 O157:H7 and non-O157 serotypes. Particularly, Shiga toxin gene stx2 was upregulated in O157:H7, but not in O104:H4. Moreover, stx1 was significantly upregulated in STEC O157:H7, but only slightly upregulated Stx1-positive non-O157 serotypes. However genes related to motility (fliC) and intimin gene (eae) were downregulated in most strains. Stress-associated sodA gene encoding manganese @entity224 dismutase was significantly upregulated in all serotypes. The dps gene coding for non-specific @entity35137 was upregulated in O145:NM, O111:NM, O103:H2 and O26:H11. However genes related to @entity1457 (cspC) and acid resistance (gadW) were significantly downregulated in all strains tested. The results of this study provide a basic understanding of the oxidative stress impact on survival and virulence of non-O157 serotype STEC strains.

The effect of oxidative stress on gene expression of Shiga toxin-producing XXXX (STEC) O157:H7 and non-O157 serotypes.

@entity5568 :: ('D006861', 'Chemical') :: ['H2O2'] @entity35137 :: ('18157783', 'Gene') :: ['DNA binding protein'] @entity1457 :: ('MESH:D012769', 'Disease') :: ['cold shock'] @entity28493 :: ('155864', 'Species') :: ['E. coli O157:H7 (EDL933'] @entity273 :: ('MESH:D006861', 'Chemical') :: ['hydrogen peroxide'] @entity224 :: ('MESH:D013481', 'Chemical') :: ['superoxide'] @entity526 :: ('562', 'Species') :: ['Escherichia coli', 'E. coli']
@entity526 :: (562,Species) :: ['Escherichia coli']
