Unsuitability of MALDI-TOF MS to discriminate Acinetobacter baumannii clones under our routine experimental conditions
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/35242 |
Resumo: | MALDI-TOF MS (matrix-assisted laser desorption/ionization time-of-flight mass spectrometry) is now in the forefront for routine bacterial species identification methodologies, being its value for clonality assessment controversial. In this work we evaluated the potential of MALDI-TOF MS for assisting infection control by depicting Acinetobacter baumannii clones. Mass spectra of 58 A. baumannii clinical isolates belonging to the worldwide spread lineages (ST98, ST103, ST208 and ST218) isolated in our country, were obtained and analysed with several chemometric tools (pseudo gel views, peakfind function and partial least squares discriminant analysis). The clonal lineages were obtained using the Oxford scheme, belonging ST98, ST208 and ST218 to the international clone II and ST103 to an epidemic clonal lineage (SG5). Additionally, mass spectra of a highly diverse international collection of 38 isolates belonging to 22 STs were obtained for further comparisons. Pseudo gel views and direct peak pattern analysis didnt allow the discrimination of A. baumannii isolates belonging to ST98, ST103, ST208 or ST218. Moreover, a partial least square discriminant analysis of the mass spectra considering two spectral ranges (2-20kDa and 4-10kDa) revealed a poor degree of discrimination with only 64.6% and 65.8% of correct ST assignments, respectively. Also, mass spectra of the international isolates (n=38, 22STs) revealed a very congruent peak pattern among them as well as among the four lineages included in this work. Despite the increasing interest of MALDI-TOF MS for bacterial typing at different taxonomical levels, we demonstrated, using routine experimental conditions, the unsuitability of this methodology for A. baumannii clonal discrimination. |
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Unsuitability of MALDI-TOF MS to discriminate Acinetobacter baumannii clones under our routine experimental conditionsAcinetobacter baumanniitypingMALDI-TOF MSsubspecieschemometricssequence typeCiências Médicas::Biotecnologia MédicaScience & TechnologyMALDI-TOF MS (matrix-assisted laser desorption/ionization time-of-flight mass spectrometry) is now in the forefront for routine bacterial species identification methodologies, being its value for clonality assessment controversial. In this work we evaluated the potential of MALDI-TOF MS for assisting infection control by depicting Acinetobacter baumannii clones. Mass spectra of 58 A. baumannii clinical isolates belonging to the worldwide spread lineages (ST98, ST103, ST208 and ST218) isolated in our country, were obtained and analysed with several chemometric tools (pseudo gel views, peakfind function and partial least squares discriminant analysis). The clonal lineages were obtained using the Oxford scheme, belonging ST98, ST208 and ST218 to the international clone II and ST103 to an epidemic clonal lineage (SG5). Additionally, mass spectra of a highly diverse international collection of 38 isolates belonging to 22 STs were obtained for further comparisons. Pseudo gel views and direct peak pattern analysis didnt allow the discrimination of A. baumannii isolates belonging to ST98, ST103, ST208 or ST218. Moreover, a partial least square discriminant analysis of the mass spectra considering two spectral ranges (2-20kDa and 4-10kDa) revealed a poor degree of discrimination with only 64.6% and 65.8% of correct ST assignments, respectively. Also, mass spectra of the international isolates (n=38, 22STs) revealed a very congruent peak pattern among them as well as among the four lineages included in this work. Despite the increasing interest of MALDI-TOF MS for bacterial typing at different taxonomical levels, we demonstrated, using routine experimental conditions, the unsuitability of this methodology for A. baumannii clonal discrimination.This work was funded by FEDER funds through the Operational Programme for Competitiveness Factors - COMPETE and by National Funds through FCT - Foundation for Science and Technology under the project UID/MULTI/04378/2013. LS was supported by doctoral grant (SFRH/BD/88028/2012) and FG by a post doc grant (SFRH/BPD/95556/2013) from Fundacao para a Ciencia e a Tecnologia. CS was funded by a CIENCIA2008 contract from FCT.Frontiers MediaUniversidade do MinhoSousa, C. C. S.Botelho, JoãoGrosso, FilipaSilva, LilianaLopes, JoãoPeixe, Luísa2015-052015-05-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/35242engSousa, C. C. S.; Botelho, J.; Grosso, F.; Silva, L.; Lopes, J.; Peixe, L., Unsuitability of MALDI-TOF MS to discriminate Acinetobacter baumannii clones under our routine experimental conditions. Frontiers in Microbiology, 6(481), 20151664-302X10.3389/fmicb.2015.00481http://journal.frontiersin.org/article/10.3389/fmicb.2015.00481/abstractinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:10:27Zoai:repositorium.sdum.uminho.pt:1822/35242Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:02:05.342355Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Unsuitability of MALDI-TOF MS to discriminate Acinetobacter baumannii clones under our routine experimental conditions |
title |
Unsuitability of MALDI-TOF MS to discriminate Acinetobacter baumannii clones under our routine experimental conditions |
spellingShingle |
Unsuitability of MALDI-TOF MS to discriminate Acinetobacter baumannii clones under our routine experimental conditions Sousa, C. C. S. Acinetobacter baumannii typing MALDI-TOF MS subspecies chemometrics sequence type Ciências Médicas::Biotecnologia Médica Science & Technology |
title_short |
Unsuitability of MALDI-TOF MS to discriminate Acinetobacter baumannii clones under our routine experimental conditions |
title_full |
Unsuitability of MALDI-TOF MS to discriminate Acinetobacter baumannii clones under our routine experimental conditions |
title_fullStr |
Unsuitability of MALDI-TOF MS to discriminate Acinetobacter baumannii clones under our routine experimental conditions |
title_full_unstemmed |
Unsuitability of MALDI-TOF MS to discriminate Acinetobacter baumannii clones under our routine experimental conditions |
title_sort |
Unsuitability of MALDI-TOF MS to discriminate Acinetobacter baumannii clones under our routine experimental conditions |
author |
Sousa, C. C. S. |
author_facet |
Sousa, C. C. S. Botelho, João Grosso, Filipa Silva, Liliana Lopes, João Peixe, Luísa |
author_role |
author |
author2 |
Botelho, João Grosso, Filipa Silva, Liliana Lopes, João Peixe, Luísa |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Sousa, C. C. S. Botelho, João Grosso, Filipa Silva, Liliana Lopes, João Peixe, Luísa |
dc.subject.por.fl_str_mv |
Acinetobacter baumannii typing MALDI-TOF MS subspecies chemometrics sequence type Ciências Médicas::Biotecnologia Médica Science & Technology |
topic |
Acinetobacter baumannii typing MALDI-TOF MS subspecies chemometrics sequence type Ciências Médicas::Biotecnologia Médica Science & Technology |
description |
MALDI-TOF MS (matrix-assisted laser desorption/ionization time-of-flight mass spectrometry) is now in the forefront for routine bacterial species identification methodologies, being its value for clonality assessment controversial. In this work we evaluated the potential of MALDI-TOF MS for assisting infection control by depicting Acinetobacter baumannii clones. Mass spectra of 58 A. baumannii clinical isolates belonging to the worldwide spread lineages (ST98, ST103, ST208 and ST218) isolated in our country, were obtained and analysed with several chemometric tools (pseudo gel views, peakfind function and partial least squares discriminant analysis). The clonal lineages were obtained using the Oxford scheme, belonging ST98, ST208 and ST218 to the international clone II and ST103 to an epidemic clonal lineage (SG5). Additionally, mass spectra of a highly diverse international collection of 38 isolates belonging to 22 STs were obtained for further comparisons. Pseudo gel views and direct peak pattern analysis didnt allow the discrimination of A. baumannii isolates belonging to ST98, ST103, ST208 or ST218. Moreover, a partial least square discriminant analysis of the mass spectra considering two spectral ranges (2-20kDa and 4-10kDa) revealed a poor degree of discrimination with only 64.6% and 65.8% of correct ST assignments, respectively. Also, mass spectra of the international isolates (n=38, 22STs) revealed a very congruent peak pattern among them as well as among the four lineages included in this work. Despite the increasing interest of MALDI-TOF MS for bacterial typing at different taxonomical levels, we demonstrated, using routine experimental conditions, the unsuitability of this methodology for A. baumannii clonal discrimination. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-05 2015-05-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/1822/35242 |
url |
http://hdl.handle.net/1822/35242 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Sousa, C. C. S.; Botelho, J.; Grosso, F.; Silva, L.; Lopes, J.; Peixe, L., Unsuitability of MALDI-TOF MS to discriminate Acinetobacter baumannii clones under our routine experimental conditions. Frontiers in Microbiology, 6(481), 2015 1664-302X 10.3389/fmicb.2015.00481 http://journal.frontiersin.org/article/10.3389/fmicb.2015.00481/abstract |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
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openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Frontiers Media |
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Frontiers Media |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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