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Title: Multilocus Sequence Typing Scheme versus Pulsed-Field Gel Electrophoresis for Typing Mycobacterium abscessus Isolates
Authors: Machado, Gabriel Esquitini [UNIFESP]
Matsumoto, Cristianne Kayoko [UNIFESP]
Chimara, Erica
Duarte, Rafael da Silva
Freitas, Denise de [UNIFESP]
Palaci, Moises
Hadad, David Jamil
Batista Lima, Karla Valeria
Lopes, Maria Luiza
Ramos, Jesus Pais
Campos, Carlos Eduardo
Caldas, Paulo Cesar
Heym, Beate
Leao, Sylvia Cardoso [UNIFESP]
Universidade Federal de São Paulo (UNIFESP)
Adolfo Lutz Inst
Universidade Federal do Rio de Janeiro (UFRJ)
Univ Fed Espirito Santo
Inst Evandro Chagas
Fiocruz MS
Hop Univ Paris Ile de France Ouest
Issue Date: 1-Aug-2014
Publisher: Amer Soc Microbiology
Citation: Journal of Clinical Microbiology. Washington: Amer Soc Microbiology, v. 52, n. 8, p. 2881-2891, 2014.
Abstract: Outbreaks of infections by rapidly growing mycobacteria following invasive procedures, such as ophthalmological, laparoscopic, arthroscopic, plastic, and cardiac surgeries, mesotherapy, and vaccination, have been detected in Brazil since 1998. Members of the Mycobacterium chelonae-Mycobacterium abscessus group have caused most of these outbreaks. As part of an epidemiological investigation, the isolates were typed by pulsed-field gel electrophoresis (PFGE). in this project, we performed a large-scale comparison of PFGE profiles with the results of a recently developed multilocus sequence typing (MLST) scheme for M. abscessus. Ninety-three isolates were analyzed, with 40 M. abscessus subsp. abscessus isolates, 47 M. abscessus subsp. bolletii isolates, and six isolates with no assigned subspecies. Forty-five isolates were obtained during five outbreaks, and 48 were sporadic isolates that were not associated with outbreaks. for MLST, seven housekeeping genes (argH, cya, glpK, gnd, murC, pta, and purH) were sequenced, and each isolate was assigned a sequence type (ST) from the combination of obtained alleles. the PFGE patterns of DraI-digested DNA were compared with the MLST results. All isolates were analyzable by both methods. Isolates from monoclonal outbreaks showed unique STs and indistinguishable or very similar PFGE patterns. Thirty-three STs and 49 unique PFGE patterns were identified among the 93 isolates. the Simpson's index of diversity values for MLST and PFGE were 0.69 and 0.93, respectively, for M. abscessus subsp. abscessus and 0.96 and 0.97, respectively, for M. abscessus subsp. bolletii. in conclusion, the MLST scheme showed 100% typeability and grouped monoclonal outbreak isolates in agreement with PFGE, but it was less discriminative than PFGE for M. abscessus.
ISSN: 0095-1137
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