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dc.contributor.author
Zerbetto de Palma, Gerardo Gabriel  
dc.contributor.author
Mendiondo, Nicolas  
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Wonaga, Andrés  
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Viola, Luis  
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Ibarra, Daniela  
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Campitelli, Esteban  
dc.contributor.author
Salim, Nicolas  
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Corti, Rodolfo  
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Goldman, Cinthia Gabriela  
dc.contributor.author
Catalano, Mariana  
dc.date.available
2018-03-20T18:04:45Z  
dc.date.issued
2016-07  
dc.identifier.citation
Zerbetto de Palma, Gerardo Gabriel; Mendiondo, Nicolas; Wonaga, Andrés; Viola, Luis; Ibarra, Daniela; et al.; Occurrence of Mutations in the Antimicrobial Target Genes Related to Levofloxacin, Clarithromycin, and Amoxicillin Resistance in Helicobacter pylori Isolates from Buenos Aires City; Mary Ann Liebert; Microbial Drug Resistance: Mechanisms Epidemiology and Disease; 23; 3; 7-2016; 1-8  
dc.identifier.issn
1076-6294  
dc.identifier.uri
http://hdl.handle.net/11336/39381  
dc.description.abstract
Domain V of 23S rRNA, gyrA and gyrB Quinolones Resistance-Determining Region (QRDR), and pbp-1A gene point mutations were investigated in Helicobacter pylori-resistant isolates from three centres of Buenos Aires. Minimal inhibitory concentrations (MICs) were performed in 197 isolates from 52 H. pylori-positive naive patients by agar dilution method. Point mutations were achieved by amplification and sequencing of the target genes, and their association with resistance was determined by natural transformation assays. Resistance rates were as follows: metronidazole 28.8%, clarithromycin (CLA) 26.9%, levofloxacin (LEV) 32.7%, and amoxicillin (AMX) 7.6%. Nearly one-third of patients carried multidrug-resistant isolates. A2143G or A2142G in domain V of 23S-rRNA was found in all isolates showing high level of resistance to CLA (MIC >2 mg/L), accounting for 76.0% (38/50) of those with the resistant phenotype. The mutations A2267G or T1861C carried by 8/12 isolates with MIC 1–2 mg/L (low level) did not confer resistance by transformation. Substitutions at GyrA position 87 or 91, mainly N87K and D91G, were found in 92.8% (52/56) of the LEV-resistant isolates: 48 isolates with MIC 4–64 mg/L and 4/8 isolates with MIC 2 mg/L. The remaining four harboured K133N, also present in susceptible isolates. None of the substitutions in GyrB demonstrated to confer resistance. Transformation proved that PBP-1A N562Y and/or T556S substitutions confer the AMX resistance in our isolates, showing an additive effect. In conclusion, the usually reported mutations related to CLA, LEV, and AMX resistance were found in our isolates. However, low-level CLA resistance seems not to be due to mutations in Domain V of 23S rRNA gene.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Mary Ann Liebert  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Helicobacter Pylori  
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Antibiotic Resistance  
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Enfermedades Infecciosas  
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Ciencias de la Salud  
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CIENCIAS MÉDICAS Y DE LA SALUD  
dc.title
Occurrence of Mutations in the Antimicrobial Target Genes Related to Levofloxacin, Clarithromycin, and Amoxicillin Resistance in Helicobacter pylori Isolates from Buenos Aires City  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2018-03-20T14:35:17Z  
dc.journal.volume
23  
dc.journal.number
3  
dc.journal.pagination
1-8  
dc.journal.pais
Estados Unidos  
dc.description.fil
Fil: Zerbetto de Palma, Gerardo Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones en Microbiología y Parasitología Médica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en Microbiología y Parasitología Médica; Argentina  
dc.description.fil
Fil: Mendiondo, Nicolas. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones en Microbiología y Parasitología Médica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en Microbiología y Parasitología Médica; Argentina  
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Fil: Wonaga, Andrés. Centro Integral de Gastroenterología; Argentina  
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Fil: Viola, Luis. Centro Integral de Gastroenterología; Argentina  
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Fil: Ibarra, Daniela. Hospital Aeronáutico Central; Argentina  
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Fil: Campitelli, Esteban. Hospital Aeronáutico Central; Argentina  
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Fil: Salim, Nicolas. Gobierno de la Ciudad de Buenos Aires. Hospital de Gastroenterología "Dr. Carlos B. Udaondo"; Argentina  
dc.description.fil
Fil: Corti, Rodolfo. Gobierno de la Ciudad de Buenos Aires. Hospital de Gastroenterología "Dr. Carlos B. Udaondo"; Argentina  
dc.description.fil
Fil: Goldman, Cinthia Gabriela. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Físico Matemática; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina  
dc.description.fil
Fil: Catalano, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones en Microbiología y Parasitología Médica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en Microbiología y Parasitología Médica; Argentina  
dc.journal.title
Microbial Drug Resistance: Mechanisms Epidemiology and Disease  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1089/mdr.2015.0361  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.liebertpub.com/doi/10.1089/mdr.2015.0361