Molecular identification of rapidly growing mycobacteria isolates from pulmonary specimens of patients in the State of Pará, Amazon region, Brazil.
We isolated 44 strains of rapidly growing mycobacteria (RGM) from 19 patients with pulmonary infections assisted at the Instituto Evandro Chagas (Pará, Brazil) from 2004 to 2007. Identification at the species level was performed by PCR restriction fragment length polymorphism analysis (PRA) of a 441 bp hsp65 fragment and partial 16S rRNA, hsp65, and rpoB gene sequencing. Genotyping by PRA yielded 3 digestion patterns: one identical to Mycobacterium abscessus type I (group I); another to M. abscessus type II, Mycobacterium bolletii, and Mycobacterium massiliense (group II); and a third typical for Mycobacterium fortuitum type I (group III). When comparing analysis of the 3 genes, more discrimination was obtained by rpoB gene sequence, which allowed good distinction between group I, II, and III strains and subclassification of group II strains in SG IIa (M. bolletii) and SG IIb (M. massiliense). In this study, we show that the description of new RGM species requires the establishment of standardized procedures for RGM identification and the alert of the clinician about their involvement in pulmonary disease and the necessity of treatment for control and cure.
Núcleo de Medicina Tropical, Universidade Federal do Pará, Belém, Pará 66.055-240, Pará, Brazil. anacosta@iec.pa.gov.br
Ana Roberta Fusco
AR
da Costa
Maria Luiza
ML
Lopes
Sylvia Cardoso
SC
Leão
Maria Paula da Cruz
MP
Schneider
Maísa Silva
MS
de Sousa
Philip Noel
PN
Suffys
Tereza Cristina de Oliveira
TC
Corvelo
Karla Valéria Batista
KV
Lima
D001426:Bacterial Proteins / Q000235:genetics; D001938:Brazil; D018834:Chaperonin 60 / Q000235:genetics; D016172:DNA Fingerprinting; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D012321:DNA-Directed RNA Polymerases / Q000235:genetics; D006801:Humans; D008969:Molecular Sequence Data; D009161:Mycobacterium / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification*; D009164:Mycobacterium Infections / Q000382:microbiology*; D018410:Pneumonia, Bacterial / Q000382:microbiology*; D016133:Polymerase Chain Reaction / Q000379:methods; D012150:Polymorphism, Restriction Fragment Length; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA
D001426:Bacterial Proteins; D018834:Chaperonin 60; D004269:DNA, Bacterial; D012336:RNA, Ribosomal, 16S; C074119:heat-shock protein 65, Mycobacterium; D012321:DNA-Directed RNA Polymerases; C105078:RNA polymerase beta subunit