Evaluación pre-analítica de dos métodos de extracción de ADN para la amplificación del gen de la pneumolisina (PLY) de Streptococcus pneumoniae, en muestras de hemocultivo

Background: Streptococcus pneumoniae is a common etiologic agent of invasive respiratory infections among children under 5 years of age and older adults. Isolation rates of S. pneumoniae by traditional culture techniques are low. Aim: To study the sensitivity and specificity of two different DNA ext...

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Autores principales:	Hernández G,Carolina, Durán T,Claudia, Ulloa F,María Teresa, Prado J,Valeria
Lenguaje:	Spanish / Castilian
Publicado:	Sociedad Médica de Santiago 2004
Materias:	Cytotoxins Polimerase chain reaction Streptolyzins Streptococcus pneumoniae
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0034-98872004000500001
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spelling	oai:scielo:S0034-988720040005000012005-11-18Evaluación pre-analítica de dos métodos de extracción de ADN para la amplificación del gen de la pneumolisina (PLY) de Streptococcus pneumoniae, en muestras de hemocultivoHernández G,CarolinaDurán T,ClaudiaUlloa F,María TeresaPrado J,Valeria Cytotoxins Polimerase chain reaction Streptolyzins Streptococcus pneumoniae Background: Streptococcus pneumoniae is a common etiologic agent of invasive respiratory infections among children under 5 years of age and older adults. Isolation rates of S. pneumoniae by traditional culture techniques are low. Aim: To study the sensitivity and specificity of two different DNA extraction methods to amplify the ply gene, applied to three different types of blood culture broths, experimentally inoculated with S. pneumoniae. Material and methods: DNA was extracted from the cultures using an organic method or a technique that consists in dilution, washing with NaOH and concentration of the sample. This was followed by PCR amplification of a 355 pb fragment of the pneumolysin gene (ply). Results: The organic DNA extraction method inhibited the PCR reaction at all concetrations studied (0.6 to 10(6) colony forming units/mL). Using the NaOH extraction, ply gene amplification was positive in all three blood culture broths, but only at concentrations of 10³ colony forming units/mL or higher. Using the same DNA extraction method, PCR was negative when the broths were inoculated with seven other related bacterial species, which results in a 100% specificity. Conclusions: Detection of S. pneumoniae by amplification of ply gene from blood cultures using the protocol of NaOH for DNA extraction is specific and provides results in a short lapse. However, the diagnostic sensitivity is not optimal, wich limits its clinical use (Rev Méd Chile 2004; 132: 533-8).info:eu-repo/semantics/openAccessSociedad Médica de SantiagoRevista médica de Chile v.132 n.5 20042004-05-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0034-98872004000500001es10.4067/S0034-98872004000500001
institution	Scielo Chile
collection	Scielo Chile
language	Spanish / Castilian
topic	Cytotoxins Polimerase chain reaction Streptolyzins Streptococcus pneumoniae
spellingShingle	Cytotoxins Polimerase chain reaction Streptolyzins Streptococcus pneumoniae Hernández G,Carolina Durán T,Claudia Ulloa F,María Teresa Prado J,Valeria Evaluación pre-analítica de dos métodos de extracción de ADN para la amplificación del gen de la pneumolisina (PLY) de Streptococcus pneumoniae, en muestras de hemocultivo
description	Background: Streptococcus pneumoniae is a common etiologic agent of invasive respiratory infections among children under 5 years of age and older adults. Isolation rates of S. pneumoniae by traditional culture techniques are low. Aim: To study the sensitivity and specificity of two different DNA extraction methods to amplify the ply gene, applied to three different types of blood culture broths, experimentally inoculated with S. pneumoniae. Material and methods: DNA was extracted from the cultures using an organic method or a technique that consists in dilution, washing with NaOH and concentration of the sample. This was followed by PCR amplification of a 355 pb fragment of the pneumolysin gene (ply). Results: The organic DNA extraction method inhibited the PCR reaction at all concetrations studied (0.6 to 10(6) colony forming units/mL). Using the NaOH extraction, ply gene amplification was positive in all three blood culture broths, but only at concentrations of 10³ colony forming units/mL or higher. Using the same DNA extraction method, PCR was negative when the broths were inoculated with seven other related bacterial species, which results in a 100% specificity. Conclusions: Detection of S. pneumoniae by amplification of ply gene from blood cultures using the protocol of NaOH for DNA extraction is specific and provides results in a short lapse. However, the diagnostic sensitivity is not optimal, wich limits its clinical use (Rev Méd Chile 2004; 132: 533-8).
author	Hernández G,Carolina Durán T,Claudia Ulloa F,María Teresa Prado J,Valeria
author_facet	Hernández G,Carolina Durán T,Claudia Ulloa F,María Teresa Prado J,Valeria
author_sort	Hernández G,Carolina
title	Evaluación pre-analítica de dos métodos de extracción de ADN para la amplificación del gen de la pneumolisina (PLY) de Streptococcus pneumoniae, en muestras de hemocultivo
title_short	Evaluación pre-analítica de dos métodos de extracción de ADN para la amplificación del gen de la pneumolisina (PLY) de Streptococcus pneumoniae, en muestras de hemocultivo
title_full	Evaluación pre-analítica de dos métodos de extracción de ADN para la amplificación del gen de la pneumolisina (PLY) de Streptococcus pneumoniae, en muestras de hemocultivo
title_fullStr	Evaluación pre-analítica de dos métodos de extracción de ADN para la amplificación del gen de la pneumolisina (PLY) de Streptococcus pneumoniae, en muestras de hemocultivo
title_full_unstemmed	Evaluación pre-analítica de dos métodos de extracción de ADN para la amplificación del gen de la pneumolisina (PLY) de Streptococcus pneumoniae, en muestras de hemocultivo
title_sort	evaluación pre-analítica de dos métodos de extracción de adn para la amplificación del gen de la pneumolisina (ply) de streptococcus pneumoniae, en muestras de hemocultivo
publisher	Sociedad Médica de Santiago
publishDate	2004
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0034-98872004000500001
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Evaluación pre-analítica de dos métodos de extracción de ADN para la amplificación del gen de la pneumolisina (PLY) de Streptococcus pneumoniae, en muestras de hemocultivo

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