title: [Evolutionary engineering in Salmonella: emergence of hybrid virulence-resistance plasmids in non-typhoid serotypes].
abstract: An example of evolutive engineering in bacterial pathogens is the emergence of hybrid virulence-resistance (VR) plasmids in Salmonella enterica, resulting from an association between antimicrobial resistance determinants and specific virulence plasmids of the S. typhimurium and S. choleraesuis serotypes. VR plasmids all possess the spv (Salmonella plasmid virulence) operon, which is involved in systemic infection; however, they differ in the presence of other virulence determinants and in the resistance gene profile. VR plasmids of S. typhimurium have been found in Europe, and show resistance regions with different levels of complexity that can include class 1 integrons and various transposons. VR plasmids of S. choleraesuis, detected in strains isolated in Taiwan, only confer resistance to ampicillin and sulfonamides. Both serotypes are zoonotic and the presence of hybrid VR plasmids may confer an adaptive advantage under certain conditions, resulting in bacterial strains that are more difficult to treat and have a higher epidemic potential.
authors.affiliation: Departamento de Biología Funcional, Area de Microbiología, Facultad de Medicina, Universidad de Oviedo, Oviedo, España. cmendoza@uniovi.es
authors.forename: María Del Carmen
authors.initials: Mdel C
authors.lastname: Mendoza
authors.forename: Ana
authors.initials: A
authors.lastname: Herrero
authors.forename: María Rosario
authors.initials: MR
authors.lastname: Rodicio
mesh_terms: D000818:Animals; D024901:Drug Resistance, Multiple, Bacterial / Q000235:genetics; D005060:Europe / Q000453:epidemiology; D019143:Evolution, Molecular; D005798:Genes, Bacterial; D006801:Humans; D032023:Integrons / Q000235:genetics; D009876:Operon / Q000235:genetics; D010957:Plasmids / Q000235:genetics*; D011815:R Factors / Q000235:genetics; D012475:Salmonella / Q000145:classification / Q000187:drug effects / Q000235:genetics* / Q000472:pathogenicity; D012480:Salmonella Infections / Q000453:epidemiology / Q000382:microbiology; D012481:Salmonella Infections, Animal / Q000453:epidemiology / Q000382:microbiology; D012641:Selection, Genetic; D012703:Serotyping; D013045:Species Specificity; D013624:Taiwan / Q000453:epidemiology; D014774:Virulence / Q000235:genetics; D015047:Zoonoses