Caracterização de isolados clínicos de Candida albicans de estudo brasileiro multicêntrico de candidemia por metodologia de “Multilocus Sequence Typing (MLST)”

Detalhes bibliográficos
Autor(a) principal: Matta, Daniel Archimedes da [UNIFESP]
Data de Publicação: 2009
Tipo de documento: Tese
Idioma: por
Título da fonte: Repositório Institucional da UNIFESP
Texto Completo: http://repositorio.unifesp.br/handle/11600/9170
Resumo: The DNA sequence-based genotyping technique multilocus sequence typing (MLST) has emerged as an alternative typing tool for C. albicans because can characterize large numbers of isolates rapidly, and does not require the subjective interpretation of banding patterns. This methodology is a very useful tool in understanding the phylogenetics and epidemiology of C. albicans strains from invasive candidiasis. Objective: Our goal was 1) to apply MLST and ABC typing to C. albicans strains recovered from bloodstream infection from public tertiary care hospitals in Brazil and 2) determine whether indistinguishable or different strains were responsible for persistent or recurrent fungemia by performing MLST and ABC typing on sequential C. albicans isolates from the same patient. Methods: We applied MLST and ABC typing, which is based on the presence or absence of an intron in the 25S rDNA region, to C. albicans strains from 61 patients with candidemia collected during a multicenter surveillance study in 11 public tertiary care hospitals, representative of the public health system of 9 of the largest cities in Brazil. We also analyzed C. albicans strains from 8 patients with persistent or recurrent candidemia. Persistent candidemia was defined as two or more blood cultures positive for C. albicans on 2 or more separate days. Recurrent candidemia was defined as an episode of candidemia occurring at least 1 month after the apparent complete resolution of an infectious episode caused by the same Candida species. Results: A total of 48 unique profiles or diploid sequence types (DST) were observed, with 10 new sequence types (STs) and 32 new DSTs. DST 69 was the most common DST isolated. C. albicans clade 1 accounted for 56% of the collection, clade 3 and clade 8 for 10% each, clades 9 and 17 for 6.5% each, and clade 12 for 5%. Clade 2, clade 4, clade 16 and a singleton strain had 1 isolate each (1.5%). For ABC typing, 82% of the isolates were classified as type A, followed for 16.5% type B and 1.5% type C. All the patients’ strains related to persistent or recurrent candidemia but one showed the same MLST diploid sequence type (DST), ABC type and susceptibility profile to antifungals in the first and second samples. One patient with 7 samples collected sequentially over 10 days showed 3 distinct strains, well discriminated by MLST. One of the 3 strains recovered from this patient showed a single C. albicans isolate found in our total collection classified as clade 2, although clade 2 is commonly found worldwide. Conclusion: More than 50% of isolates from this study form a unique set of DSTs and clade 1 was responsible for 56% of the isolates. For ABC typing, 82% of the isolates were type A. To the best of our knowledge, this is the first study describing a blood stream infection with 3 distinct C. albicans strains in the same patient within a short period of time.
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spelling Caracterização de isolados clínicos de Candida albicans de estudo brasileiro multicêntrico de candidemia por metodologia de “Multilocus Sequence Typing (MLST)”Characterization of clinical isolates of Candida albicans from a multicenter Brazilian surveillance of Candidemia by Multilocus Sequence Typing (MLST) methodTipagem de sequências multilocusCandidemiaCandida albicansMultilocus sequence typingCandidemiaCandida albicansThe DNA sequence-based genotyping technique multilocus sequence typing (MLST) has emerged as an alternative typing tool for C. albicans because can characterize large numbers of isolates rapidly, and does not require the subjective interpretation of banding patterns. This methodology is a very useful tool in understanding the phylogenetics and epidemiology of C. albicans strains from invasive candidiasis. Objective: Our goal was 1) to apply MLST and ABC typing to C. albicans strains recovered from bloodstream infection from public tertiary care hospitals in Brazil and 2) determine whether indistinguishable or different strains were responsible for persistent or recurrent fungemia by performing MLST and ABC typing on sequential C. albicans isolates from the same patient. Methods: We applied MLST and ABC typing, which is based on the presence or absence of an intron in the 25S rDNA region, to C. albicans strains from 61 patients with candidemia collected during a multicenter surveillance study in 11 public tertiary care hospitals, representative of the public health system of 9 of the largest cities in Brazil. We also analyzed C. albicans strains from 8 patients with persistent or recurrent candidemia. Persistent candidemia was defined as two or more blood cultures positive for C. albicans on 2 or more separate days. Recurrent candidemia was defined as an episode of candidemia occurring at least 1 month after the apparent complete resolution of an infectious episode caused by the same Candida species. Results: A total of 48 unique profiles or diploid sequence types (DST) were observed, with 10 new sequence types (STs) and 32 new DSTs. DST 69 was the most common DST isolated. C. albicans clade 1 accounted for 56% of the collection, clade 3 and clade 8 for 10% each, clades 9 and 17 for 6.5% each, and clade 12 for 5%. Clade 2, clade 4, clade 16 and a singleton strain had 1 isolate each (1.5%). For ABC typing, 82% of the isolates were classified as type A, followed for 16.5% type B and 1.5% type C. All the patients’ strains related to persistent or recurrent candidemia but one showed the same MLST diploid sequence type (DST), ABC type and susceptibility profile to antifungals in the first and second samples. One patient with 7 samples collected sequentially over 10 days showed 3 distinct strains, well discriminated by MLST. One of the 3 strains recovered from this patient showed a single C. albicans isolate found in our total collection classified as clade 2, although clade 2 is commonly found worldwide. Conclusion: More than 50% of isolates from this study form a unique set of DSTs and clade 1 was responsible for 56% of the isolates. For ABC typing, 82% of the isolates were type A. To the best of our knowledge, this is the first study describing a blood stream infection with 3 distinct C. albicans strains in the same patient within a short period of time.A metodologia do “Multilocus Sequence Typing (MLST)” tornou-se uma ferramenta importante para tipagem molecular para C. albicans porque esta metodologia pode caracterizar grande número de isolados rapidamente e está isenta da interpretação subjetiva de padrões de bandas em géis de eletroforese. Este método é muito útil no entendimento da filogenia e epidemiologia de cepas de C. albicans recuperadas de infecções fúngicas invasivas. Objetivos: 1) aplicar as metodologias de MLST e Tipagem ABC para isolados de C. albicans recuperados de infecções de corrente sanguínea em hospitais terciários no Brasil e 2) determinar se cepas indistinguíveis ou diferentes foram responsáveis pelos episódios de candidemia persistente ou candidemia recorrente em isolados sequenciais de mesmo paciente. Material e Métodos: Nós aplicamos a metodologia do MLST e Tipagem ABC em isolados de C. albicans de 61 pacientes com candidemia coletados durante um estudo multicêntrico realizado em 11 hospitais públicos terciários de 9 cidades brasileiras. Também foram avaliados os isolados sequenciais de 8 pacientes com candemia persistente ou recorrente. Candidemia persistente foi definido como um episódio de fungemia com duas ou mais culturas positivas para C. albicans, em 2 ou mais dias diferentes, a despeito da contínua terapia antifúngica adotada. Candidemia recorrente foi definida como um episódio de candidemia ocorrendo ao menos 1 mês após o episódio incidente e a negativação de duas hemoculturas sequenciais após introdução da terapia antifúngica, envolvendo a mesma espécie de Candida. Resultados: Um total de 48 únicos “diploid sequence types (DSTs)” foram observados, incluindo 10 novos genótipos e 32 novos DSTs. DST 69 foi o mais comum entre os nossos isolados. Isolados clado 1 responderam a 56% da nossa coleção. O clado 3 e clado 8 foram os clados com maior número de isolados depois de clado 1, ambos respondendo por 10% das amostras. O clado 9 e clado 17 foram responsáveis por 6,5% dos isolados cada um. Isolados clado 12 responderam por 5%. Foi isolada uma única cepa (1,5%) do clado 2, clado 4, clado 16 e um isolado categorizado como “solitário”. Para Tipagem ABC, 82% dos isolados foram classificados como tipo A, seguido por tipo B com 16,5% e tipo C com 1,5%. Quanto aos pacientes com candidemia persistente ou recorrente, para todos os pacientes exceto um, verificou-se a permanência dos mesmos DSTs encontrados entre a primeira e última amostra coletada. Um único paciente com coletas sequenciais pelo período de 10 dias apresentou 3 cepas distintas discriminadas pelo MLST. Uma destas 3 cepas foi a única representante do clado 2 em nosso estudo. Conclusão: Mais de 50% dos isolados deste estudo apresentaram novos DSTs, predominando o clado 1 em 56% das amostras. Para a Tipagem ABC, 82% dos isolados foram do tipo A. Este é o primeiro estudo de nosso conhecimento a descrever infecção de corrente sanguínea por 3 cepas distintas de C. albicans documentadas no período de 10 dias.TEDEBV UNIFESP: Teses e dissertaçõesCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)CNPq: GM/GD 142025-2005-4CNPq: SWE 200669/2007-9Universidade Federal de São Paulo (UNIFESP)Colombo, Arnaldo Lopes [UNIFESP]Universidade Federal de São Paulo (UNIFESP)Matta, Daniel Archimedes da [UNIFESP]2015-07-22T20:49:41Z2015-07-22T20:49:41Z2009-09-30info:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/publishedVersion129 p.application/pdfMATTA, Daniel Archimedes da. Caracterização de isolados clínicos de Candida albicans de estudo brasileiro multicêntrico de candidemia por metodologia de “Multilocus Sequence Typing (MLST)”. 2009. 129 f. Tese (Doutorado em Ciências) - Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, 2009.Publico-9170.pdfhttp://repositorio.unifesp.br/handle/11600/9170porinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UNIFESPinstname:Universidade Federal de São Paulo (UNIFESP)instacron:UNIFESP2024-08-05T13:39:00Zoai:repositorio.unifesp.br/:11600/9170Repositório InstitucionalPUBhttp://www.repositorio.unifesp.br/oai/requestbiblioteca.csp@unifesp.bropendoar:34652024-08-05T13:39Repositório Institucional da UNIFESP - Universidade Federal de São Paulo (UNIFESP)false
dc.title.none.fl_str_mv Caracterização de isolados clínicos de Candida albicans de estudo brasileiro multicêntrico de candidemia por metodologia de “Multilocus Sequence Typing (MLST)”
Characterization of clinical isolates of Candida albicans from a multicenter Brazilian surveillance of Candidemia by Multilocus Sequence Typing (MLST) method
title Caracterização de isolados clínicos de Candida albicans de estudo brasileiro multicêntrico de candidemia por metodologia de “Multilocus Sequence Typing (MLST)”
spellingShingle Caracterização de isolados clínicos de Candida albicans de estudo brasileiro multicêntrico de candidemia por metodologia de “Multilocus Sequence Typing (MLST)”
Matta, Daniel Archimedes da [UNIFESP]
Tipagem de sequências multilocus
Candidemia
Candida albicans
Multilocus sequence typing
Candidemia
Candida albicans
title_short Caracterização de isolados clínicos de Candida albicans de estudo brasileiro multicêntrico de candidemia por metodologia de “Multilocus Sequence Typing (MLST)”
title_full Caracterização de isolados clínicos de Candida albicans de estudo brasileiro multicêntrico de candidemia por metodologia de “Multilocus Sequence Typing (MLST)”
title_fullStr Caracterização de isolados clínicos de Candida albicans de estudo brasileiro multicêntrico de candidemia por metodologia de “Multilocus Sequence Typing (MLST)”
title_full_unstemmed Caracterização de isolados clínicos de Candida albicans de estudo brasileiro multicêntrico de candidemia por metodologia de “Multilocus Sequence Typing (MLST)”
title_sort Caracterização de isolados clínicos de Candida albicans de estudo brasileiro multicêntrico de candidemia por metodologia de “Multilocus Sequence Typing (MLST)”
author Matta, Daniel Archimedes da [UNIFESP]
author_facet Matta, Daniel Archimedes da [UNIFESP]
author_role author
dc.contributor.none.fl_str_mv Colombo, Arnaldo Lopes [UNIFESP]
Universidade Federal de São Paulo (UNIFESP)
dc.contributor.author.fl_str_mv Matta, Daniel Archimedes da [UNIFESP]
dc.subject.por.fl_str_mv Tipagem de sequências multilocus
Candidemia
Candida albicans
Multilocus sequence typing
Candidemia
Candida albicans
topic Tipagem de sequências multilocus
Candidemia
Candida albicans
Multilocus sequence typing
Candidemia
Candida albicans
description The DNA sequence-based genotyping technique multilocus sequence typing (MLST) has emerged as an alternative typing tool for C. albicans because can characterize large numbers of isolates rapidly, and does not require the subjective interpretation of banding patterns. This methodology is a very useful tool in understanding the phylogenetics and epidemiology of C. albicans strains from invasive candidiasis. Objective: Our goal was 1) to apply MLST and ABC typing to C. albicans strains recovered from bloodstream infection from public tertiary care hospitals in Brazil and 2) determine whether indistinguishable or different strains were responsible for persistent or recurrent fungemia by performing MLST and ABC typing on sequential C. albicans isolates from the same patient. Methods: We applied MLST and ABC typing, which is based on the presence or absence of an intron in the 25S rDNA region, to C. albicans strains from 61 patients with candidemia collected during a multicenter surveillance study in 11 public tertiary care hospitals, representative of the public health system of 9 of the largest cities in Brazil. We also analyzed C. albicans strains from 8 patients with persistent or recurrent candidemia. Persistent candidemia was defined as two or more blood cultures positive for C. albicans on 2 or more separate days. Recurrent candidemia was defined as an episode of candidemia occurring at least 1 month after the apparent complete resolution of an infectious episode caused by the same Candida species. Results: A total of 48 unique profiles or diploid sequence types (DST) were observed, with 10 new sequence types (STs) and 32 new DSTs. DST 69 was the most common DST isolated. C. albicans clade 1 accounted for 56% of the collection, clade 3 and clade 8 for 10% each, clades 9 and 17 for 6.5% each, and clade 12 for 5%. Clade 2, clade 4, clade 16 and a singleton strain had 1 isolate each (1.5%). For ABC typing, 82% of the isolates were classified as type A, followed for 16.5% type B and 1.5% type C. All the patients’ strains related to persistent or recurrent candidemia but one showed the same MLST diploid sequence type (DST), ABC type and susceptibility profile to antifungals in the first and second samples. One patient with 7 samples collected sequentially over 10 days showed 3 distinct strains, well discriminated by MLST. One of the 3 strains recovered from this patient showed a single C. albicans isolate found in our total collection classified as clade 2, although clade 2 is commonly found worldwide. Conclusion: More than 50% of isolates from this study form a unique set of DSTs and clade 1 was responsible for 56% of the isolates. For ABC typing, 82% of the isolates were type A. To the best of our knowledge, this is the first study describing a blood stream infection with 3 distinct C. albicans strains in the same patient within a short period of time.
publishDate 2009
dc.date.none.fl_str_mv 2009-09-30
2015-07-22T20:49:41Z
2015-07-22T20:49:41Z
dc.type.driver.fl_str_mv info:eu-repo/semantics/doctoralThesis
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format doctoralThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv MATTA, Daniel Archimedes da. Caracterização de isolados clínicos de Candida albicans de estudo brasileiro multicêntrico de candidemia por metodologia de “Multilocus Sequence Typing (MLST)”. 2009. 129 f. Tese (Doutorado em Ciências) - Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, 2009.
Publico-9170.pdf
http://repositorio.unifesp.br/handle/11600/9170
identifier_str_mv MATTA, Daniel Archimedes da. Caracterização de isolados clínicos de Candida albicans de estudo brasileiro multicêntrico de candidemia por metodologia de “Multilocus Sequence Typing (MLST)”. 2009. 129 f. Tese (Doutorado em Ciências) - Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, 2009.
Publico-9170.pdf
url http://repositorio.unifesp.br/handle/11600/9170
dc.language.iso.fl_str_mv por
language por
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.format.none.fl_str_mv 129 p.
application/pdf
dc.publisher.none.fl_str_mv Universidade Federal de São Paulo (UNIFESP)
publisher.none.fl_str_mv Universidade Federal de São Paulo (UNIFESP)
dc.source.none.fl_str_mv reponame:Repositório Institucional da UNIFESP
instname:Universidade Federal de São Paulo (UNIFESP)
instacron:UNIFESP
instname_str Universidade Federal de São Paulo (UNIFESP)
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reponame_str Repositório Institucional da UNIFESP
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repository.name.fl_str_mv Repositório Institucional da UNIFESP - Universidade Federal de São Paulo (UNIFESP)
repository.mail.fl_str_mv biblioteca.csp@unifesp.br
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