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Cartography of methicillin-resistant S. aureus transcripts: detection, orientation and temporal expression during growth phase and stress conditions

Deluen, Cecile
Gaspin, Christine
Romby, Pascale
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Published in PloS one. 2010, vol. 5, no. 5, e10725
Abstract BACKGROUND: Staphylococcus aureus is a versatile bacterial opportunist responsible for a wide spectrum of infections. The severity of these infections is highly variable and depends on multiple parameters including the genome content of the bacterium as well as the condition of the infected host. Clinically and epidemiologically, S. aureus shows a particular capacity to survive and adapt to drastic environmental changes including the presence of numerous antimicrobial agents. Mechanisms triggering this adaptation remain largely unknown despite important research efforts. Most studies evaluating gene content have so far neglected to analyze the so-called intergenic regions as well as potential antisense RNA molecules. PRINCIPAL FINDINGS: Using high-throughput sequencing technology, we performed an inventory of the whole transcriptome of S. aureus strain N315. In addition to the annotated transcription units, we identified more than 195 small transcribed regions, in the chromosome and the plasmid of S. aureus strain N315. The coding strand of each transcript was identified and structural analysis enabled classification of all discovered transcripts. RNA purified at four time-points during the growth phase of the bacterium allowed us to define the temporal expression of such transcripts. A selection of 26 transcripts of interest dispersed along the intergenic regions was assessed for expression changes in the presence of various stress conditions including pH, temperature, oxidative shocks and growth in a stringent medium. Most of these transcripts showed expression patterns specific for the defined stress conditions that we tested. CONCLUSIONS: These RNA molecules potentially represent important effectors of S. aureus adaptation and more generally could support some of the epidemiological characteristics of the bacterium.
Keywords Base SequenceConserved SequenceDNA, Complementary/geneticsGene Expression Profiling*Gene Expression Regulation, BacterialGenome, Bacterial/geneticsHigh-Throughput Screening AssaysMethicillin-Resistant Staphylococcus aureus/*genetics/*growth & developmentMolecular Sequence DataNucleic Acid ConformationRNA, Antisense/genetics/metabolismRNA, Bacterial/chemistry/classification/geneticsRNA, Messenger/genetics/metabolismReproducibility of ResultsReverse Transcriptase Polymerase Chain ReactionSequence Analysis, RNAStress, Physiological/*geneticsTime Factors
PMID: 20505759
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Research groups Acquisition et expression de facteurs de virulence chez Staphylococcus aureus (86)
Analyse génomique et fonctionnelle du staphylocoque doré (604)
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BEAUME, Marie-Emilie et al. Cartography of methicillin-resistant S. aureus transcripts: detection, orientation and temporal expression during growth phase and stress conditions. In: PloS one, 2010, vol. 5, n° 5, p. e10725. doi: 10.1371/journal.pone.0010725 https://archive-ouverte.unige.ch/unige:20766

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Deposited on : 2012-05-23

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