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Importance of integrons in the diffusion of resistance

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Carattoli, Alessandra·2001·Veterinary Research

Abstract

Horizontal transfer of resistance genes is a successful mechanism for the transmission and dissemination of multiple drug resistance among bacterial pathogens.The impact of horizontally transmitted genetic determinants in the evolution of resistance is particularly evident when resistance genes are physically associated in clusters and transferred en bloc to the recipient cell.Recent advances in the molecular characterisation of antibiotic resistance mechanisms have highlighted the existence of genetic structures, called integrons, involved in the acquisition of resistance genes.These DNA elements have frequently been reported in multi-drug resistant strains isolated from animals and humans, and are located either on the bacterial chromosome or on broad-host-range plasmids.The role of integrons in the development of multiple resistance relies on their unique capacity to cluster and express drug resistance genes.Moreover, the spread of resistance genes among different replicons and their exchange between plasmid and bacterial chromosome are facilitated by the integration of integrons into transposable elements.The association of a highly efficient gene capture and expression system, together with the capacity for vertical and horizontal transmission of resistance genes represents a powerful weapon used by bacteria to combat the assault of antibiotics. antimicrobial resistance / integron / transposon / horizontal gene transferRésumé -Importance des intégrons dans la diffusion de la résistance.Le transfert horizontal de gènes est un mécanisme efficace pour la transmission et la dissémination, parmi les agents pathogènes bactériens, de résistances multiples aux antibiotiques.L'impact des déterminants génétiques transmis horizontalement dans l'évolution de la résistance est particulièrement évident lorsque les gènes de résistance sont physiquement regroupés, et transférés en bloc à la cellule réceptrice.Des avancées récentes dans la caractérisation moléculaire des mécanismes de résistance aux antibiotiques ont mis en évidence l'existence de structures génétiques, appelées intégrons, impliqués dans l'acquisition de gènes de résistance.Ces éléments d'ADN ont été fréquemment observés dans des souches bactériennes multi-résistantes isolées chez des animaux ou chez des humains, localisés soit sur le chromosome bactérien, soit sur des plasmides à large spectre d'hôte.Le rôle des intégrons dans le développement de la multi-résistance repose sur leur capacité unique à former des clusters de gènes et à exprimer des gènes Vet.

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Metadata

Authors
Carattoli, A.
Venue
Veterinary Research
Publisher
EDP Sciences
Published
2001-05
Volume
32
Issue
3/4
Pages
243-259
ISSN
  • 0928-4249 (ISSN-L)
  • 1297-9716
OpenAlex
W1964159659
Cited by
287
References
1
FWCI
3.84
Type
journal article
Language
en
Open access
bronze

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Carattoli, A. (2001). Importance of integrons in the diffusion of resistance. Veterinary Research. https://doi.org/10.1051/vetres%3A2001122

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