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Université de Fribourg

Dimercaptosuccinic acid in combination with carbapenems against isogenic strains of Escherichia coli producing or not producing a metallo-β-lactamase in vitro and in murine peritonitis

Cheminet, G. ; de Lastours, V. ; Poirel, Laurent ; Chau, F. ; Peoc’h, K. ; Massias, L. ; Fantin, B. ; Nordmann, Patrice

In: Journal of Antimicrobial Chemotherapy, 2020, vol. 75, no. 12, p. 3593–3600

Background: Carbapenemase-producing Enterobacterales represent a major therapeutic challenge. MBLs, requiring zinc at their catalytic site, could be inhibited by meso-dimercaptosuccinic acid (DMSA), a heavy metal chelator already widely used for treating lead intoxication.Objectives: To evaluate the activity of carbapenems alone or combined with DMSA against MBL-producing Escherichia coli in...

Université de Fribourg

The inoculum effect of Escherichia coli expressing mcr-1 or not on colistin activity in a murine model of peritonitis

Fantin, B. ; Poujade, J. ; Grégoire, N. ; Chau, F. ; Roujansky, A. ; Kieffer, Nicolas ; Berleur, M. ; Couet, W. ; Nordmann, Patrice

In: Clinical Microbiology and Infection, 2019, vol. 25, no. 12, p. 1563.e5-1563.e8

Colistin often remains the last resort antibiotic active against carbapenemase- producing Enterobacteriaceae. However, while in vitro inoculum effect has been reported, therapeutic relevance of this phenomenon remains questioned.Methods: Ten E. coli strains were used that included the wild-type CFT073 and its transconjugant CFT073-MCR-1 and eight susceptible clinical isolates. Mice with ...

Université de Fribourg

mcr-9, An inducible gene encoding an acquired phosphoethanolamine transferase in Escherichia coli, and its origin

Kieffer, Nicolas ; Royer, b Guilhem ; Decousser, Jean-Winoc ; Bourrel, Anne-Sophie ; Palmieri, Mattia ; Ortiz De La Rosa, Jose-Manuel ; Jacquier, Hervé ; Denamur, Erick ; Nordmann, Patrice ; Poirel, Laurent

In: Antimicrobial Agents and Chemotherapy, 2019, vol. 63, no. 9, p. -

The plasmid-located mcr-9 gene, encoding a putative phosphoethanolamine transferase, was identified in a colistin-resistant human fecal Escherichia coli strain belonging to a very rare phylogroup, the D-ST69-O15:H6 clone. This MCR-9 protein shares 33% to 65% identity with the other plasmid-encoded MCR-type enzymes identified (MCR-1 to -8) that have been found as sources of acquired resistance...

Université de Fribourg

Altering the temporal regulation of one transcription factor drives evolutionary trade-offs between head sensory organs

Ramaekers, Ariane ; Claeys, Annelies ; Kapun, Martin ; Mouchel-Vielh, Emmanuèle ; Potier, Delphine ; Weinberger, Simon ; Grillenzoni, Nicola ; Dardalhon-Cuménal, Delphine ; Yan, Jiekun ; Wolf, Reinhard ; Flatt, Thomas ; Buchner, Erich ; Hassan, Bassem A.

In: Developmental Cell, 2019, vol. 50, no. 6, p. 780-792.e7

Size trade-offs of visual versus olfactory organs is a pervasive feature of animal evolution. This could result from genetic or functional constraints. We demonstrate that head sensory organ size trade-offs in Drosophila are genetically encoded and arise through differential subdivision of the head primordium into visual versus non- visual fields. We discover that changes in the temporal...

Université de Fribourg

Colistin resistance in Parisian inpatient faecal Escherichia coli as the result of two distinct evolutionary pathways

Bourrel, Anne Sophie ; Poirel, Laurent ; Royer, Guilhem ; Darty, Mélanie ; Vuillemin, Xavier ; Kieffer, Nicolas ; Clermont, Olivier ; Denamur, Erick ; Nordmann, Patrice ; Decousser, Jean-Winoc ; The IAME Resistance Group

In: Journal of Antimicrobial Chemotherapy, 2019, vol. 74, no. 6, p. 1521–1530

Beyond plasmid-encoded resistance (mcr genes) prevalence in strain collections, large epidemiological studies to estimate the human burden of colistin-resistant Escherichia coli gut carriage are lacking.Objectives: To evaluate the prevalence of colistin-resistant E. coli carriage in inpatients and decipher the molecular support of resistance and the genetic background of the strains.Methods:...