Listeria monocytogenes
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ABSTRACT:
PROVIDER: PRJNA136239 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Previous studies have shown the increased thermo-tolerance of pathogenic bacteria if pre-exposed to temperatures above their optimal levels prior to a particular heat treatment. It was unclear, however, whether there was a direct relationship between the different gene expression and the induced thermo-tolerance. Microarray analysis was performed to identify the differentially expressed genes during heat stress by comparing the transcriptome of L. monocytogenes under optimal temperature (37°C), and thermo-tolerance inducing (48°C for 30 minutes. A majority of the differentially expressed genes were up-regulated at heat shock as compared to those that were down-regulated when the cells were exposed to thermo-tolerance inducing conditions. Though many of the differentially expressed genes could be tentatively classified based on the current functional classification of genes (COG) per the NCBI database, many of the gene loci could not been attributed to a specific function due to the current limited knowledge on the functional genomics of L. monocytogenes.
2020-12-31 | GSE26570 | GEO
Project description:Differential expression of genes in Listeria monocytogenes under prolonged heat shock
| PRJNA136417 | ENA
Project description:To characterize regulons of alternative sigma factor SigH, SigL, and SigC in Listeria monocytogenes, in-frame mutant strains were created in the 10403S background. Regulons controlled by these 3 alternative sigma factors were characterized by whole-genome microarrays. The L. monocytogenes 10403S wild type and sigma factor null mutation strains were grown at 37 °C to stationary phase (defined in this study as growth to OD600 = 1.0, followed by incubation for an additional 3 h) prior to RNA isolation. Transcriptional profiles of 10403S wild type were compared to those of null mutation strain. In addition to stationary phase condition, SigC regulon was further characterized using heat stress (cultures grown to log phase at OD600 = 0.4, 37 °C and then exposed to heat at 55 °C for 10 min) and a condition with IPTG-inducible expression of sigC (sigC gene is placed under Pspac promoter using pLIV2 vector in wild type 10403S background). Under these conditions, expression profiles were compared between (i) wild type and sigC null mutant for heat stress and (ii) IPTG-inducible sigC strain and sigC null mutant, respectively. Using adjusted P < 0.05 and ≥ 1.5 fold change as cutoff values, microarray analyses identified 169 SigH-dependent, 51 SigL-dependent, and 3 SigC-dependent genes. Keywords: Listeria monocytogenes, alternative sigma factor, SigH, SigL, SigC
2011-04-12 | GSE24339 | GEO
Project description:As the foodborne pathogen Listeria monocytogenes has the ability to grow at refrigeration temperatures, whole-genome microarray experiments were performed using L. monocytogenes strain 10403S to define the cold stress regulon and to identify genes differentially expressed during growth at 4°C and 37°C. Microarray analysis using a stringent cutoff (adjusted p<0.001; fold-change >2.0) revealed 105 and 170 genes that showed higher transcript levels in logarithmic- and stationary-phase cells, respectively, at 4°C (compared to cells at 37°C). A total of 74 and 102 genes showed lower transcript levels in logarithmic- and stationary-phase cells grown at 4°C, respectively. Genes upregulated at 4°C during both stationary- and log-phase included those encoding a two-component response regulator (lmo0287), a cold shock protein (cspL), and two RNA helicases (lmo0866 and lmo1722), whereas genes encoding selected virulence factors and heat shock proteins were downregulated at 4°C. Selected genes that were upregulated at 4°C during both stationary- and log-phase were confirmed by quantitative reverse transcriptase PCR. Our data show (i) a large number of L. monocytogenes genes are differentially expressed at 4 and 37°C with a larger number of genes showing higher transcript level at 4°C than genes showing lower transcript levels at 4°C; (ii) L. monocytogenes genes upregulated at 4°C include a number of genes and operons with previously reported or plausible roles in cold adaptation; and (iii) L. monocytogenes genes downregulated at 4°C include a number of virulence and virulence-associated genes as well as some heat shock genes. Keywords: Listeria monocytogenes, cold regulon, temperature
2007-08-31 | GSE7465 | GEO
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
2007-10-14 | GSE7514 | GEO
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
2007-11-03 | GSE7517 | GEO
Project description:The stationary phase stress response transcriptome of the human bacterial pathogen Listeria monocytogenes was defined using RNA sequencing (RNA-Seq) with the Illumina Genome Analyzer. Specifically, bacterial transcriptomes were compared between stationary phase cells of L. monocytogenes 10403S and an otherwise isogenic DsigB mutant, which does not express the alternative sigma factor σB, a major regulator of genes contributing to stress response. Keywords: Transcriptome and differential expression analyses
2010-01-05 | GSE15651 | GEO
Project description:Microarray analysis was performed to identify the differentially expressed genes during heat stress by comparing the transcriptome of L. monocytogenes under optimal temperature (37°C), and prolonged heat shock (60°C for 9 minutes) conditions.
2020-12-31 | GSE26670 | GEO
Project description:These studies were designed to examine the acute Listeria monocytogenes transcriptional response to mammalian (porcine) bile.
2011-04-12 | GSE28507 | GEO
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.
2014-03-07 | GSE48187 | GEO