RESUMO
In this article, the first isolation of Mycobacterium kyorinense specimens in Brazil is described. M. kyorinense is a recently identified species, with a few strains reported only in Japan. The Brazilian isolates were initially identified as Mycobacterium celatum by PCR restriction enzyme pattern analysis (PRA) with hsp65. However, biochemical tests indicated the same profile of M. kyorinense and distinguished them from M. celatum and Mycobacterium branderi. The sequencing of the hsp65, rpoB, and 16S rRNA genes allowed the accurate identification of isolates as M. kyorinense.
Assuntos
Infecções por Mycobacterium/diagnóstico , Infecções por Mycobacterium/microbiologia , Mycobacterium/classificação , Mycobacterium/isolamento & purificação , Proteínas de Bactérias/genética , Brasil , Chaperonina 60/genética , DNA Bacteriano/química , DNA Bacteriano/genética , RNA Polimerases Dirigidas por DNA/genética , Humanos , Dados de Sequência Molecular , Filogenia , RNA Ribossômico 16S/genética , Análise de Sequência de DNARESUMO
Human tuberculosis (TB) is caused by members of the Mycobacterium tuberculosis complex (MTBC), including Mycobacterium tuberculosis var. tuberculosis (MTB) and Mycobacterium tuberculosis var. africanum (MAF). While MTB is isolated worldwide, MAF is almost completely restricted to the African continent, and despite the historical proximity between Brazil and Africa during the slave trade, no case of TB being caused by MAF has been reported in Brazil to date. We hereby describe the first case of TB caused by MAF in Brazil comparing its genome against the published ones. A female patient who had never visited Africa presented with clinical symptoms typical of pulmonary TB. Based on 16S rRNA gene sequencing, the cultured isolate was identified as belonging to MTBC and partial sequence of the hsp65 gene was identical to that of MAF. This was confirmed by genotyping based on detection of Single Nucleotide Polymorphism (SNP), Region of Difference (RD) and spoligotyping. The isolate presented the Shared International Typing (SIT) 181. In the whole-genome comparison against MAF genomes available on published EMBL-EBI European Nucleotide Archive (ENA), the Brazilian genome (MAFBRA00707) was identified as belonging to Lineage 6 and clustered with isolates from The Gambia. This is the first report of the isolation of MAF from a patient from Brazil, without evidence of having any contact with an African index case.
Assuntos
Mycobacterium tuberculosis/classificação , Mycobacterium tuberculosis/genética , Tuberculose Pulmonar/diagnóstico , Tuberculose Pulmonar/microbiologia , Brasil/epidemiologia , Genes Bacterianos , Genoma Bacteriano , Genótipo , Humanos , Epidemiologia Molecular , Tipagem Molecular , Mycobacterium tuberculosis/isolamento & purificação , Filogenia , Polimorfismo de Nucleotídeo Único , RNA Ribossômico 16S , Tuberculose Pulmonar/epidemiologiaRESUMO
Twenty-one pulmonary sputum samples from nine Brazilian patients were analyzed by the PRA-hsp65 method for identification of Mycobacterium species and the results were compared by sequencing. We reported a mutation at the position 381, that generates a suppression cutting site in the BstEII enzyme, thus leading to a new PRA-hsp65 pattern for M. asiaticum identification.
Assuntos
Infecções por Mycobacterium/microbiologia , Mycobacterium/classificação , Mutação Puntual , Brasil , DNA Bacteriano/genética , Humanos , Mycobacterium/genética , Mycobacterium/isolamento & purificação , Filogenia , Reação em Cadeia da Polimerase/métodos , Escarro/microbiologiaRESUMO
OBJECTIVES: Mycobacterium kansasii (M. kansasii) pulmonary infection can cause disease with clinical and radiological features similar to tuberculosis. Failure to treat M. kansasii infection is usually associated with resistance; to increase the chance of successful treatment it is important to identify the species and know the susceptibility profile. This study aimed to evaluate the antimycobacterial susceptibility profiles of M. kansasii isolates from Brazil. METHODS: Sixty-nine M. kansasii isolates from 69 patients were identified by partial sequencing of the hsp65 gene, and their susceptibility profiles were analysed by minimal inhibitory concentration (MIC) assays. RESULTS: From 69 isolates, 68 showed susceptibility to clarithromycin, amikacin, and moxifloxacin. Most strains showed high rates of resistance to trimethoprim-sulfamethoxazole and ciprofloxacin. Resistance to rifampicin and ethambutol was found in 12% and 25% of isolates, respectively. CONCLUSIONS: Worrying results were found regarding susceptibility to some drugs used as first-line agents in the treatment of diseases caused by M. kansasii.
Assuntos
Antibacterianos/farmacologia , Farmacorresistência Bacteriana Múltipla , Infecções por Mycobacterium não Tuberculosas/microbiologia , Mycobacterium kansasii/efeitos dos fármacos , Proteínas de Bactérias/genética , Brasil , Chaperonina 60/genética , Humanos , Testes de Sensibilidade MicrobianaRESUMO
In this study we describe the first isolation of Mycobacterium triplex in Latin America. This species causes infections in humans, with very few reports from around the world. We isolated two sputum specimens of a patient with a 6-year history of human immunodeficiency and tuberculosis treatment failure. All tests used confirmed M. triplex and the patient responded well to drug therapy for 18months.
Assuntos
Infecções por Mycobacterium não Tuberculosas/microbiologia , Micobactérias não Tuberculosas/isolamento & purificação , Escarro/microbiologia , Coinfecção , DNA Bacteriano , Feminino , Infecções por HIV/complicações , Infecções por HIV/tratamento farmacológico , Humanos , América Latina/epidemiologia , Pessoa de Meia-Idade , Infecções por Mycobacterium não Tuberculosas/complicações , Infecções por Mycobacterium não Tuberculosas/epidemiologia , Micobactérias não Tuberculosas/classificação , Micobactérias não Tuberculosas/genética , Filogenia , Reação em Cadeia da Polimerase , Análise de Sequência de DNARESUMO
This work comprises 9 pulmonary nontuberculous mycobateria isolates obtained from sputum of 4 different patients from Brazil. The sequencing and phylogenetic analysis allowed their accurate identification as Mycobacterium intracellulare. We report a mutation at position 453 creating a new HaeIII cutting site and, therefore, a new PRA-hsp65 M. intracellulare profile.