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Des ARN non-codants au cœur du métabolisme des sucres : nouveaux mécanismes et impact sur l'adaptation et la virulence

Abstract : Staphylococcus aureus is a human opportunist pathogenic bacterium capable to colonize different host tissues and organs and therefore generates multiple infectious conditions. Its pathogenic power is due to the expression of multiple virulence factors, and by it’s ability to adapt to the environment. Once entered in human tissues, S. aureus must face environmental changes, as the availability of nutriments to survive. Gene expressions implicated in these adaptive responses are submitted to a fine regulation, carried by two component systems, transcriptional factors, and sRNA (small RNA). In this study, I have identified the functions of a sRNA, called RsaI, which is repressed when the external concentration of glucose is at high levels. RsaI represses the translation of multiple mRNA implicated in the carbon metabolism, including a major glucose transporter, and IcaR, implicated in the biofilms synthesis. Furthermore, RsaI interacts with other sRNA. This multifunctional RNA is a real sensor of the external glucose levels, generating a metabolic switch that is necessary to ensure S. aureus adaptive response in infectious conditions.
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Delphine Mege-Bronesky. Des ARN non-codants au cœur du métabolisme des sucres : nouveaux mécanismes et impact sur l'adaptation et la virulence. Génomique, Transcriptomique et Protéomique [q-bio.GN]. Université de Strasbourg, 2017. Français. ⟨NNT : 2017STRAJ053⟩. ⟨tel-02003421⟩

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