Project description:In Streptococcus pyogenes, mutation of GidA results in avirulence despite the same growth rate as the wild type. To understand the basis of this effect, global transcription profiling was conducted. Keywords: Wild type vs. GidA mutant Streptococcus pyogenes
Project description:Whole genone expression profile comparing wild-type NZ131 to serR deletion mutant, grown in C-medium Mutants and interpretation are described further in the manuscript to be submitted: LaSarre and Federle, 2010. Title: Regulation and Consequence of Serine Catabolism in Streptococcus pyogenes. A two chip study using total RNA recovered from three separate wild-type cultures of Streptococcus pyogenes NZ131 and three separate mutant cultures of Streptococcus pyogenes NZ131 seR-, pooled following RNA extraction
Project description:Purpose: RNase Y is a major enzyme responsible for mRNA degradation in Streptococcus pyogenes. The goals of this study are to understand whether RNase Y plays a role in operon transcription of S. pyogenes NZ131 by using RNA-seq analysis. Methods: S. pyogenes mRNA profiles of wild type (WT) and RNase Y mutant (∆rny) were generated by deep sequencing, in duplicate, using Illumina Hiseq 2000. The sequence reads were aligned to the S. pyogenes genome using Bowtie2. The aligned files were sorted to BAM format and indexed using Samtools. The read depth of each base was derived from BAM files using BEDtools. Operon organization of S. pyogenes WT and ∆rny strains were predicted based on base reads. Results: A total of 11 to 12 billion reads were obtained from each sample. More than 99% of these reads were mapped to the S. pyogenes genome. Predictions of operon organization using WT and ∆rny samples showed little difference between the two strains. Conclusions: Our result shows that the mutation of RNase Y does not affect the operon organization of S. pyogenes NZ131.
Project description:Whole genome expression profile comparing MGAS315 treated with XIP pheromone versus vehicle-treated cells Interpretations are described further in the manuscript to be submitted: authors Mashburn-Warren, Morrison, and Federle. Title: The Cryptic Competence Pathway in Streptococcus pyogenes is Controlled by a Peptide Pheromone. A two chip study using total RNA recovered from three separate cultures of Streptococcus pyogenes MGAS315, each treated with either XIP pheromone or with vehicle; RNA preparation of cultures receiving same type of treatment were pooled using equivalent amounts of RNA from each culture. RNA pools were fluorescently labeled and hybridized to arrays designed to the S. pyogenes NZ131 genome.
Project description:Streptococcus pyogenes (group A Streptococcus, GAS) responds to environmental changes in a manner that results in an adaptive regulation of the transcriptome. Global transcriptional regulators are able to integrate important extracellular and intracellular information and are responsible for modulation of the transcriptional network. The roles of several global transcriptional regulators in adaptation and virulence gene expression have been described. In this study we used microarray to investigate the regulatory roles of CodY and CovRS played in Streptococcus pyogenes. keywords: genetic modification Streptococcus pyogenes NZ131 wild-type cells, ΔcodY, ΔcovRS and ΔcodYcovRS strains were grown in C-medium until mid-exponential phase or early-stationary phase. The transcriptional profile of the whole genome was examined with microarray.
Project description:The human pathogen Streptococcus pyogenes, or group A streptococcus, is responsible for mild infections to life-threatening diseases. We previously have performed the transcription start site profiling of a Streptococcus pyogenes emm1 strain, strain S119, an invasive strain isolated from a blood culture. Here, we perform strand-specific RNA-seq experiments to complete this characterization and analyze the global coverage and the differential expression in growth medium complemented or not with 15 mM MgCl2. In addition we compare these results to those obtained with a related strain, strain S126, corresponding to a colonization sample, that differs from S119 by only one mutation in the two-component regulator of virulence CovRS.