Characterization of In Vitro-Generated and Clinical Optochin-Resistant Strains of Streptococcus pneumoniae Isolated from Argentina

Autores
Cortes, Paulo; Albarracín Orio, Andrea Georgina; Regueira, Mabel; Piñas, German Eduardo; Echenique, Jose Ricardo
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Optochin susceptibility is a key test used for pneumococcal diagnosis, but optochin-resistant (Optr) pneumococci have been reported in the last 2 decades. In this work, we characterized eight Optr clinical strains which presented a new mutation, G47V, a predominant A49S mutation (recently reported in Brazil) and A49T. These mutations were found in the c subunit of the F0F1 ATPase encoded by the atpC gene, and W206C was found in the a subunit encoded by the atpA gene. The Optr clinical isolates were analyzed by BOX PCR, multilocus sequence typing, and serotype and antimicrobial resistance profiles, and they showed no epidemiological relationship. To characterize the Optr mutations that could emerge among clinical strains, we studied a pool of spontaneous Optr colonies obtained in vitro from the virulent D39 strain. We compared the atpAC mutations of these Optr pneumococci (with or without passage through C57BL/6 mice) with those described in the clinical isolates. This analysis revealed three new mutations, G47V and L26M in the c subunit and L184S in the a subunit. Most of the mutations identified in the laboratory-generated Optr strains were also found in clinical strains, with the exception of the L26M and L184S mutations, and we suppose that both mutations could emerge among invasive strains in the future. Considering that atpAC are essential genes, we propose that all spontaneous mutations that confer in vitro optochin resistance would not present severe physiological alterations in S. pneumoniae and may be carried by circulating pneumococcal strains.
Fil: Cortes, Paulo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; Argentina
Fil: Albarracín Orio, Andrea Georgina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; Argentina
Fil: Regueira, Mabel. Dirección Nacional de Institutos de Investigación. Administración Nacional de Laboratorios e Institutos de Salud. Instituto Nacional de Enfermedades Infecciosas; Argentina
Fil: Piñas, German Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; Argentina
Fil: Echenique, Jose Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; Argentina
Materia
STREPTOCOCCUS PNEUMONIAE
H+-ATPASE
OPTOQUIN RESISTANCE
atpAC GENES
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/241124
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Characterization of In Vitro-Generated and Clinical Optochin-Resistant Strains of Streptococcus pneumoniae Isolated from ArgentinaCortes, PauloAlbarracín Orio, Andrea GeorginaRegueira, MabelPiñas, German EduardoEchenique, Jose RicardoSTREPTOCOCCUS PNEUMONIAEH+-ATPASEOPTOQUIN RESISTANCEatpAC GENEShttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Optochin susceptibility is a key test used for pneumococcal diagnosis, but optochin-resistant (Optr) pneumococci have been reported in the last 2 decades. In this work, we characterized eight Optr clinical strains which presented a new mutation, G47V, a predominant A49S mutation (recently reported in Brazil) and A49T. These mutations were found in the c subunit of the F0F1 ATPase encoded by the atpC gene, and W206C was found in the a subunit encoded by the atpA gene. The Optr clinical isolates were analyzed by BOX PCR, multilocus sequence typing, and serotype and antimicrobial resistance profiles, and they showed no epidemiological relationship. To characterize the Optr mutations that could emerge among clinical strains, we studied a pool of spontaneous Optr colonies obtained in vitro from the virulent D39 strain. We compared the atpAC mutations of these Optr pneumococci (with or without passage through C57BL/6 mice) with those described in the clinical isolates. This analysis revealed three new mutations, G47V and L26M in the c subunit and L184S in the a subunit. Most of the mutations identified in the laboratory-generated Optr strains were also found in clinical strains, with the exception of the L26M and L184S mutations, and we suppose that both mutations could emerge among invasive strains in the future. Considering that atpAC are essential genes, we propose that all spontaneous mutations that confer in vitro optochin resistance would not present severe physiological alterations in S. pneumoniae and may be carried by circulating pneumococcal strains.Fil: Cortes, Paulo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; ArgentinaFil: Albarracín Orio, Andrea Georgina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; ArgentinaFil: Regueira, Mabel. Dirección Nacional de Institutos de Investigación. Administración Nacional de Laboratorios e Institutos de Salud. Instituto Nacional de Enfermedades Infecciosas; ArgentinaFil: Piñas, German Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; ArgentinaFil: Echenique, Jose Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; ArgentinaAmerican Society for Microbiology2008-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/241124Cortes, Paulo; Albarracín Orio, Andrea Georgina; Regueira, Mabel; Piñas, German Eduardo; Echenique, Jose Ricardo; Characterization of In Vitro-Generated and Clinical Optochin-Resistant Strains of Streptococcus pneumoniae Isolated from Argentina; American Society for Microbiology; Journal of Clinical Microbiology; 46; 6; 6-2008; 1930-19340095-1137CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://journals.asm.org/doi/10.1128/jcm.02318-07info:eu-repo/semantics/altIdentifier/doi/10.1128/jcm.02318-07info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:28:48Zoai:ri.conicet.gov.ar:11336/241124instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-22 11:28:48.466CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Characterization of In Vitro-Generated and Clinical Optochin-Resistant Strains of Streptococcus pneumoniae Isolated from Argentina
title Characterization of In Vitro-Generated and Clinical Optochin-Resistant Strains of Streptococcus pneumoniae Isolated from Argentina
spellingShingle Characterization of In Vitro-Generated and Clinical Optochin-Resistant Strains of Streptococcus pneumoniae Isolated from Argentina
Cortes, Paulo
STREPTOCOCCUS PNEUMONIAE
H+-ATPASE
OPTOQUIN RESISTANCE
atpAC GENES
title_short Characterization of In Vitro-Generated and Clinical Optochin-Resistant Strains of Streptococcus pneumoniae Isolated from Argentina
title_full Characterization of In Vitro-Generated and Clinical Optochin-Resistant Strains of Streptococcus pneumoniae Isolated from Argentina
title_fullStr Characterization of In Vitro-Generated and Clinical Optochin-Resistant Strains of Streptococcus pneumoniae Isolated from Argentina
title_full_unstemmed Characterization of In Vitro-Generated and Clinical Optochin-Resistant Strains of Streptococcus pneumoniae Isolated from Argentina
title_sort Characterization of In Vitro-Generated and Clinical Optochin-Resistant Strains of Streptococcus pneumoniae Isolated from Argentina
dc.creator.none.fl_str_mv Cortes, Paulo
Albarracín Orio, Andrea Georgina
Regueira, Mabel
Piñas, German Eduardo
Echenique, Jose Ricardo
author Cortes, Paulo
author_facet Cortes, Paulo
Albarracín Orio, Andrea Georgina
Regueira, Mabel
Piñas, German Eduardo
Echenique, Jose Ricardo
author_role author
author2 Albarracín Orio, Andrea Georgina
Regueira, Mabel
Piñas, German Eduardo
Echenique, Jose Ricardo
author2_role author
author
author
author
dc.subject.none.fl_str_mv STREPTOCOCCUS PNEUMONIAE
H+-ATPASE
OPTOQUIN RESISTANCE
atpAC GENES
topic STREPTOCOCCUS PNEUMONIAE
H+-ATPASE
OPTOQUIN RESISTANCE
atpAC GENES
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Optochin susceptibility is a key test used for pneumococcal diagnosis, but optochin-resistant (Optr) pneumococci have been reported in the last 2 decades. In this work, we characterized eight Optr clinical strains which presented a new mutation, G47V, a predominant A49S mutation (recently reported in Brazil) and A49T. These mutations were found in the c subunit of the F0F1 ATPase encoded by the atpC gene, and W206C was found in the a subunit encoded by the atpA gene. The Optr clinical isolates were analyzed by BOX PCR, multilocus sequence typing, and serotype and antimicrobial resistance profiles, and they showed no epidemiological relationship. To characterize the Optr mutations that could emerge among clinical strains, we studied a pool of spontaneous Optr colonies obtained in vitro from the virulent D39 strain. We compared the atpAC mutations of these Optr pneumococci (with or without passage through C57BL/6 mice) with those described in the clinical isolates. This analysis revealed three new mutations, G47V and L26M in the c subunit and L184S in the a subunit. Most of the mutations identified in the laboratory-generated Optr strains were also found in clinical strains, with the exception of the L26M and L184S mutations, and we suppose that both mutations could emerge among invasive strains in the future. Considering that atpAC are essential genes, we propose that all spontaneous mutations that confer in vitro optochin resistance would not present severe physiological alterations in S. pneumoniae and may be carried by circulating pneumococcal strains.
Fil: Cortes, Paulo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; Argentina
Fil: Albarracín Orio, Andrea Georgina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; Argentina
Fil: Regueira, Mabel. Dirección Nacional de Institutos de Investigación. Administración Nacional de Laboratorios e Institutos de Salud. Instituto Nacional de Enfermedades Infecciosas; Argentina
Fil: Piñas, German Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; Argentina
Fil: Echenique, Jose Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; Argentina
description Optochin susceptibility is a key test used for pneumococcal diagnosis, but optochin-resistant (Optr) pneumococci have been reported in the last 2 decades. In this work, we characterized eight Optr clinical strains which presented a new mutation, G47V, a predominant A49S mutation (recently reported in Brazil) and A49T. These mutations were found in the c subunit of the F0F1 ATPase encoded by the atpC gene, and W206C was found in the a subunit encoded by the atpA gene. The Optr clinical isolates were analyzed by BOX PCR, multilocus sequence typing, and serotype and antimicrobial resistance profiles, and they showed no epidemiological relationship. To characterize the Optr mutations that could emerge among clinical strains, we studied a pool of spontaneous Optr colonies obtained in vitro from the virulent D39 strain. We compared the atpAC mutations of these Optr pneumococci (with or without passage through C57BL/6 mice) with those described in the clinical isolates. This analysis revealed three new mutations, G47V and L26M in the c subunit and L184S in the a subunit. Most of the mutations identified in the laboratory-generated Optr strains were also found in clinical strains, with the exception of the L26M and L184S mutations, and we suppose that both mutations could emerge among invasive strains in the future. Considering that atpAC are essential genes, we propose that all spontaneous mutations that confer in vitro optochin resistance would not present severe physiological alterations in S. pneumoniae and may be carried by circulating pneumococcal strains.
publishDate 2008
dc.date.none.fl_str_mv 2008-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/241124
Cortes, Paulo; Albarracín Orio, Andrea Georgina; Regueira, Mabel; Piñas, German Eduardo; Echenique, Jose Ricardo; Characterization of In Vitro-Generated and Clinical Optochin-Resistant Strains of Streptococcus pneumoniae Isolated from Argentina; American Society for Microbiology; Journal of Clinical Microbiology; 46; 6; 6-2008; 1930-1934
0095-1137
CONICET Digital
CONICET
url http://hdl.handle.net/11336/241124
identifier_str_mv Cortes, Paulo; Albarracín Orio, Andrea Georgina; Regueira, Mabel; Piñas, German Eduardo; Echenique, Jose Ricardo; Characterization of In Vitro-Generated and Clinical Optochin-Resistant Strains of Streptococcus pneumoniae Isolated from Argentina; American Society for Microbiology; Journal of Clinical Microbiology; 46; 6; 6-2008; 1930-1934
0095-1137
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://journals.asm.org/doi/10.1128/jcm.02318-07
info:eu-repo/semantics/altIdentifier/doi/10.1128/jcm.02318-07
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Society for Microbiology
publisher.none.fl_str_mv American Society for Microbiology
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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