Project description:This study investigated the alternative gene, protein expression and morphological changes of L. monocytogenes 08-5923 following 15min, 4h and 30h exposure to bacteriocin carnocyclin A (cclA). The microarray experiment studied the gene expression of untreated and treated Listeria cells following 4h exposure to cclA.
Project description:This study investigated the alternative gene, protein expression and morphological changes of L. monocytogenes 08-5923 following 15min, 4h and 30h exposure to bacteriocin carnocyclin A (cclA). The microarray experiment studied the gene expression of untreated and treated Listeria cells following 4h exposure to cclA. A six chip study using total RNA recovered from six separate cultures of L. monocytogenes 08-5923; three grown in TSB (untreated) and three grown in TSB with cclA (treated); Each chip measures the expression level of 2,857 genes from L. monocytogenes 08-5923 with five 60-mer probe pairs (PM/MM) per gene, with 1-fold technical redundancy.
Project description:A wild type strain of Listeria monocytogenes (L. mono) was used for infections. Mice were infected subcutaneously on the footpad with a sublethal dose of 1 × 10^6 colony-forming units (CFU). Mice were left for indicated times before being sacrificed. Control cells were from either PBS injected mouse or from the uninjected leg of infected animal.
Project description:The foodborne pathogen Listeria monocytogenes uses a number of transcriptional regulators, including the negative regulator CtsR, to control gene expression under different environmental conditions and in response to stress. Gene expression patterns of DctsR log phase cells were compared to both wt and ictsR-mcsA log phase cells grown with 0.5mM IPTG to identify CtsR-dependent genes.We identified 62 CtsR-dependent genes that showed significant expression ratios (adj. P < 0.05), with ≥ 1.5-fold differential expression either between ΔctsR and wt or between ΔctsR and ictsR-mcsA. Keywords: Listeria monocytogenes, CtsR regulon, log phase
Project description:The foodborne pathogen Listeria monocytogenes uses a number of transcriptional regulators, including the negative regulator HrcA, to control gene expression under different environmental conditions and in response to stress. Gene expression patterns of DhrcA stationary phase cells were compared to wt to identify hrcA-dependent genes. We identified 61 HrcA-dependent genes that showed significant expression ratios (adj. P < 0.05), with ≥ 1.5-fold differential expression between ΔhrcA and wt. Combined with microarray analysis, Hidden Markov Model searches show HrcA directly repress at least 8 genes. Keywords: Listeria monocytogenes, HrcA regulon, stationary phase
Project description:Listeria monocytogenes strain 10403S has been studied extensively for stress response activity toward multiple stressors (acid, osmotic, cold, high temperature, etc.) as well as multiple stress regulons (SigB, CtsR, HrcA, etc.). Here we aimed to determine the transcriptional response of Listeria monocytogenes in early log phase towards the strong oxidative stress imposed by ClO2. The elucidation of such a response allows for further a more completel understanding of the mechanism of inactivation by sanitizers, specifically ClO2.
Project description:Investigation of whole genome gene expression level changes in Listeria monocytogenes LO28 delta-lhrC1-5 mutant, compared to the wild type strain. The lhrC1-5 genes encode the regulatory sRNAs LhrC1-5. The microarray studied the gene expression of unstressed cells and cells exposed to cefuroxime for 30 min. The lhrC1-5 mutant employed in this study is further described in Sievers et al. (2014) A multicopy sRNA of Listeria monocytogenes regulates expression of the virulence adhesin LapB. Nucleic Acids Res. 42:9383-98.
