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Last update: May 2021

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Micalis

Microbial Adaptation Determinants

MicrobAdapt

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Notre équipe étudie le comportement de bactéries opportunistes à Gram-positif dans divers environnements. Nos principaux modèles bactériens sont Staphylococcus aureus et Streptococcus agalactiae. Ils sont largement retrouvés dans les milieux d’élevages où ils peuvent conduire à des infections comme les mammites chez les bovins pour les pathologies les moins sévères. Grâce à leur forte capacité d’adaptation on les retrouve également dans les matrices alimentaires mais aussi chez l’humain. Chez ce dernier, ils peuvent provoquer de graves infections. Une façon de traiter les populations animales et humaines contre les infections est l’antibiothérapie mais avec le risque de faire émerger des isolats résistants. Pour aborder les problèmes d’adaptation, de contrôle et de résistance aux antibiotiques, nous développons 3 axes de recherche :

Axe 1 Ecologie et Opportunisme : les interactions au sein du microbiote, comme l'échange de métabolites, peuvent-elle influencer la persistance et la colonisation d’organismes opportunistes ?

Axe 2 Les acides gras et l’antibiorésistance : l’utilisation d’acides gras de l’hôte ou de la matrice alimentaire par les bactéries permet-elle de contourner les effets des antibiotiques ciblant la synthèse des lipides bactériens ?

Axe 3 Sécurité alimentaire : Peut-on mettre en place des méthodes de détection sensibles contre ces pathogènes et autres comme Campylobacter jejuni dans les matrices alimentaires ?

Illustration 2022MicrobAdapt

Articles récemment publiés :

Franza, T., Rogstam, A., Thiyagarajan, S., Sullivan, M. J., Derré-Bobillot, A., Bauer, M. C., Goh, G.K.G., Da Cunha, V., Glaser, P., Logan, D.T., Ulett, G.C., von Wachenfeldt, C. & Gaudu, P. (2021). NAD+ pool depletion as a signal for the Rex regulon involved in Streptococcus agalactiae virulence. PLoS pathogens, 17(8), e1009791.

Cesselin, B., Garrigues, C., Pedersen, M. B., Roussel, C., Gruss, A., & Gaudu, P. (2018). Task distribution between acetate and acetoin pathways to prolong growth in Lactococcus lactis under respiration conditions. Applied and environmental microbiology, 84(18), e01005-18.

Franza, T., & Gaudu, P. (2022). Quinones: More Than Electron Shuttles. Research in Microbiology, 103953.

Pathania, A., Anba-Mondoloni, J., Gominet, M., Halpern, D., Dairou, J., Dupont, L., Lamberet G., Trieu-Cuot P., Gloux K. & Gruss, A. (2021). (p) ppGpp/GTP and malonyl-CoA modulate Staphylococcus aureus adaptation to FASII antibiotics and provide a basis for synergistic bi-therapy. Mbio, 12(1), e03193-20.

Kénanian, G., Morvan, C., Weckel, A., Pathania, A., Anba-Mondoloni, J., Halpern, D., Gaillard, M., Solgadi, A., Dupont, L., Henry, C., Poyart, C., Fouet, A., Lamberet, G., Gloux, K. & Gruss, A. (2019). Permissive fatty acid incorporation promotes staphylococcal adaptation to FASII antibiotics in host environments. Cell reports, 29(12), 3974-3982.

Vizzini, P., Manzano, M., Farre, C., Meylheuc, T., Chaix, C., Ramarao, N., & Vidic, J. (2021). Highly sensitive detection of Campylobacter spp. In chicken meat using a silica nanoparticle enhanced dot blot DNA biosensor. Biosensors and Bioelectronics, 171, 112689.

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Contact:

Philippe GAUDU

INRA - MICALIS
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