Transcriptome Comparison of phoU Homologies Genes Deletion strain and the Parent Strain in log-phase (6 h).
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ABSTRACT: Purpose: To compare the transcriptome changes in phoU1(serp0956) or phoU2(serp0316)deletion strain with the parent strain SE1457 in log-phase (6 h) Methods: Total RNA was isolated and sequenced from the phoU1 deletion strain, phoU2 deletion strain and the parent strain SE1457 in log-phase (6 h) in triplicate using an illumina high-seq 2500. Raw data was analyzed using TopHat. Genes were considered changed which performed fold-change>=1.5 and FDR<=0.05. Changed genes were then filtered to reveal the downstream targets of phoU1 or phoU2 in log-phase (6 h). Results: The expression of 23 genes were significantly decreased and 69 genes was significantly increased in expression level due to the loss of phoU1 expression.The expression of 474 genes were significantly decreased and 471 genes were significantly increased in expression level due to the loss of phoU2 expression.
Project description:Purpose: To compare the transcriptome changes in phoU1(serp0956) or phoU2(serp0316)deletion strain with the parent strain SE1457 in stationary phase (10 h). Methods: Total RNA was isolated and sequenced from the phoU1 deletion strain, phoU2 deletion strain and the parent strain SE1457 in stationary phase (10 h) in triplicate using an illumina high-seq 2500. Raw data was analyzed using TopHat. Genes were considered changed which performed fold-change>=1.5 and FDR<=0.05. Changed genes were then filtered to reveal the downstream targets of phoU1 or phoU2. Results: The expression of 2 genes were significantly decreased and no genes was significantly increased in expression level due to the loss of phoU1 expression.The expression of 279 genes were significantly decreased and 716 genes were significantly increased in expression level due to the loss of phoU2 expression.
Project description:The two-component system (TCS) SrrAB responds to the oxidative stress in Staphylococcus epidermidis. To study its regulatory function in oxidative stress, a srrAB deletion mutant (∆srrAB) was constructed using S. epidermidis strain 1457 (SE1457) as the parent strain. Compared to SE1457, the viable cell counts of the ∆srrAB mutant significantly decreased in the post-stationary phase culture, coinciding with a sharp increase in ROS accumulation. The impaired growth of the ∆srrAB mutant was partially restored by shifting the culture from oxic to microaerobic conditions. Consistently, growth of the ∆srrAB mutant in TSB medium containing H2O2 was notably inhibited compared to parent strain SE1457, and the mutant showed significantly decreased resistance (100- to 1000-fold) to H2O2 and CHP in both oxic and microaerobic conditions, which was fully rescued by the addition of ROS inhibitor DIP. Furthermore, deletion of srrAB resulted in decreased intracellular survival in the Ana-1 macrophages due to intracellular ROS accumulation. Complementation of srrAB in the ∆srrAB mutant restored ROS resistance and intracellular survival to wild-type levels. RNA-seq analysis revealed that srrAB deletion affected the transcription levels of 610 genes, including those involved in oxidative stress, respiratory and energy metabolism, and transition ion homeostasis. These findings were corroborated by quantitative real-time reverse transcription-PCR (qRT-PCR). In the ∆srrAB mutant, expressions of ROS-scavenging genes katA, ahpC, scdA, serp1797 and serp0483 were downregulated compared to SE1457. Electrophoretic mobility shift assay further demonstrated that phosphorylated SrrA bound to the promoter regions of srrAB, katA, ahpC, scdA, serp1797 and serp0483 genes. This study elucidates that in S. epidermidis, SrrAB is the first TCS to sense and respond upon the oxidants, directly regulating transcription levels of the genes involved in ROS scavenging and ion homeostasis, thereby facilitating S. epidermidis detoxification of ROS and adaption to the commensal environment.
Project description:Microarray analysis of the expression profiles of a parent and its derived M-bM-^HM-^FlstC mutant in normal and high salt conditions. The analysis was performed to determine which genes were altered in the mutant when grown in high salt conditions relative to the parent strain. Cultures were performed in triplicate and collected during mid-log phase growth in normal and high salt conditions. RNA was extracted for Affymetrix microarray analysis and compared to identify genes significantly altered in their expression using R and Bioconductor.
Project description:Gene regulatory networks play an important role in coordinating biochemical fluxes through diverse metabolic pathways. The modulation of enzyme levels enables efficient utilization of limited resources as organisms dynamically acclimate to nutritional fluctuations in their environment. Here we have identified and characterized a novel nutrient-responsive transcription factor from the halophilic archaea, VNG1451C. In this experiment we used whole-genome microarray analysis in the VNG1451C deletion mutant vs. H. salinarum NRC-1 ura3 parent strain in rich medium during growth to show that the expression of many metabolic genes is perturbed in the VNG1451C deletion mutant. Halobacterium salinarum NRC-1 (ATCC700922) ura3 parent and VNG1451C strains were grown in complex medium (CM; 250g/L NaCl, 20g/L MgSO4.7H2O, 3g/L sodium citrate, 2g/L KCl, 10g/L peptone) at 37ºC under full-spectrum white light. Biological replicate samples were removed throughout the growth curve at early log, mid log, late log, and stationary phase to measure genome-wide transcription.
Project description:We set out to determine a) if histone in Halobacterium salinarum regulates transcription and b) whether the magnitude and extent of these changes matches those observed in organisms which use histone protein as their primary DNA packaging agent. To this end, gene expression data for a histone knock-out (?ura3?hpyA) strain versus parent (?ura3) were collected. The histone deletion mutant and parent strain, at log and stationary phase, were compared to the common reference strain NRC-1 (log). There are three biological replicates each, plus dye-flips, for a total of 24 arrays
Project description:We compared the expression profile of TTHA0118 deletion mutant strain of Thermus thermophils HB8 with that of wild-type. The mutant strain grown in minimum essential medium (CS medium) exhibited growth retardation. In early log phase, 29 genes were suppressed and 25 genes were activated for the mutant strain. The suppressed genes included genes of electron transport, and cell growth and division. The activated genes included genes of stress response. We suggested that these transcriptional alterations in the mutant cell were induced by the pAp accumulation and mononucleotides starvation. Keywords: cell type comparison Keywords: cell type comparison
Project description:Changes in gene expression of the serotype A wild-type strain H99W with the hva1∆ (8), hva1∆+HVA1 (8-15) or a Galleria-passaged (P15) strain were examined during log-phase growth at 37 ºC.
Project description:Objective of the study is to find out the differentially regulated genes of Mycobacterium BCG strain in extended stationary phase comparison to log phase growth and resuscitation phase. Mycobacterium BCG culture was grown in Sauton medium at 37o C without shaking. Cells at A600 0.6-0.8 were harvested as log phase culture. The cells harvested after 5 months incubation at 37oC without shaking became non culturable and were harvested as extended stationary phase cells. The extended stationary phase cells were treated with resuscitation promoting factor (Rpf) from Micrococcus luteus and harvested after 8 days. Cells of this stage were treated as resuscitation phase cells. Gene expression profiling was carried out using Agilent microarray platform. Keywords: Extended stationary phase, Log phase growth and Resuscitation phase.