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© Michel-Robert Popoff
Clostridium difficile en microscopie à contraste de phase. On distingue des bactéries sporulées, non sporulées et d'autres en cours de lyse (destruction). Bactérie de l'environnement (sol, eau, foin, sable), elle est à l'origine d'infections nosocomiales survenant après un traitement antibiotique : Clostridium difficile prédomine alors que les autres bactéries de la flore intestinale ont été détruites. L'infection peut provoquer deux types de pathologies graves : les colites pseudo-membraneuses dont l'origine est quasiment due à 100 % à C. difficile et la diarrhée post-antibiothérapie due à C. difficile dans 30 % des cas de ces diarrhées.
Publication : Methods in enzymology

Riboswitch discovery by combining RNA-seq and genome-wide identification of transcriptional start sites

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Methods in enzymology - 01 Jan 2014

Rosinski-Chupin I, Soutourina O, Martin-Verstraete I

Link to Pubmed [PMID] – 25432742

Meth. Enzymol. 2014;549:3-27

Deep-sequencing technologies applied to RNA have tremendous potential to identify novel transcripts with single-nucleotide resolution. By combining whole-transcript cDNA sequencing (RNA-seq) and genome-wide identification of transcription start sites (dRNA-seq), it is possible to characterize long 5′-untranslated regions potentially endowed with regulatory capacities and to detect premature termination of transcription. This can be used to identify new potential riboswitches. In this chapter, we provide a detailed protocol of the dRNA-seq method based on differential pretreatment of RNAs with tobacco acid pyrophosphatase to differentiate between 5′-ends of primary and processed RNAs. We also give a briefer protocol of the preparation of RNA-seq libraries and of how to go through data bioinformatics analysis and data visualization using genome browsers. This approach is powerful to identify novel riboswitches and to demonstrate the functionality of riboswitches predicted in silico.

http://www.ncbi.nlm.nih.gov/pubmed/25432742