Mycobacterial Infections Caused by Nontuberculous Mycobacteria

Heifets, Leonid

doi:10.1055/s-2004-829501

Cited by 48 publications

(41 citation statements)

References 74 publications

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“…Growth rates separate them down into rapid or slow growers, habitat defi nes them as environmental (free living/saprophytic) or host adapted, while disease causing properties separate the tuberculous from the non-tuberculous mycobacteria (NTM) [32]. The terms atypical mycobacteria and mycobacteria other than M. tuberculosis (MOTT) are also in use for NTM that cause infections.…”

Section: Mycobacterial Phylogenymentioning

confidence: 99%

“…associated in the environment with the aquatic insect Naucoris cimicoides [38] and also snails [39] and plants [40.] Similarly, strains within and outside the M. avium complex (MAC) have been studied to address evolution, strain differentiation, differential growth niches and replication rates [7,32,41]. Details for some such fi ndings are presented in later sections of this review.…”

Section: Mycobacterial Phylogenymentioning

confidence: 99%

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Defining mycobacteria: Shared and specific genome features for different lifestyles

Vissa

Sakamuri

et al. 2009

Indian J Microbiol

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During the last decade, the combination of rapid whole genome sequencing capabilities, application of genetic and computational tools, and establishment of model systems for the study of a range of species for a spectrum of biological questions has enhanced our cumulative knowledge of mycobacteria in terms of their growth properties and requirements. The adaption of the corynebacterial surrogate system has simplifi ed the study of cell wall biosynthetic machinery common to actinobacteria. Comparative genomics supported by experimentation reveals that superimposed on a common core of 'mycobacterial' gene set, pathogenic mycobacteria are endowed with multiple copies of several protein families that encode novel secretion and transport systems such as mce and esx; immunomodulators named PE/PPE proteins, and polyketide synthases for synthesis of complex lipids. The precise timing of expression, engagement and interactions involving one or more of these redundant proteins in their host environments likely play a role in the defi nition and differentiation of species and their disease phenotypes. Besides these, only a few species specifi c 'virulence' factors i.e., macromolecules have been discovered. Other subtleties may also arise from modifi cations of shared macromolecules. In contrast, to cope with the broad and changing growth conditions, their saprophytic relatives have larger genomes, in which the excess coding capacity is dedicated to transcriptional regulators, transporters for nutrients and toxic metabolites, biosynthesis of secondary metabolites and catabolic pathways. In this review, we present a sampling of the tools and techniques that are being implemented to tease apart aspects of physiology, phylogeny, ecology and pathology and illustrate the dominant genomic characteristics of representative species. The investigation of clinical isolates, natural disease states and discovery of new diagnostics, vaccines and drugs for existing and emerging mycobacterial diseases, particularly for multidrug resistant strains are the challenges in the coming decades.

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Section: Mycobacterial Phylogenymentioning

confidence: 99%

Section: Mycobacterial Phylogenymentioning

confidence: 99%

Defining mycobacteria: Shared and specific genome features for different lifestyles

Vissa

Sakamuri

et al. 2009

Indian J Microbiol

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“…The increasing prevalence of disease due to NTM is related both to more intense interactions of humans with certain types of environment and to changes in population demographics, including a growing number of people who are immunosuppressed as a result of HIV/AIDS, malignancy or medical intervention (Heifets, 2004).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Speed-Oligo Mycobacteria assay for the identification of nontuberculous mycobacteria

Ramis

Cnockaert

Groll

et al. 2015

Journal of Medical Microbiology

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Nontuberculous mycobacteria (NTM) causing human infectious disease have become increasingly common. Rapid and accurate identification to the species level is, therefore, critical. The Speed-Oligo Mycobacteria assay is an oligochromatographic method that was made available recently for the identification and differentiation of mycobacteria. The present study aimed to evaluate the performance of the Speed-Oligo Mycobacteria assay for the identification of NTM. We examined a total of 62 strains (9 type strains, 19 reference strains and 34 clinical isolates) belonging to 13 different species (Mycobacterium intracellulare, M. fortuitum, M. gordonae, M. kansasii, M. marinum, M. peregrinum, M. scrofulaceum, M. abscessus, M. bovis BCG, M. chelonae, M. avium, M. malmoense and M. xenopi). The Speed-Oligo Mycobacteria assay was performed according to the manufacturer's instructions. Discrepant results between Speed-Oligo Mycobacteria and the original identification were reassessed by the Speed-Oligo Mycobacteria assay and resolved by the GenoType Mycobacterium CM assay and by sequencing of 16S rRNA and protein-encoding genes. We found 93.5 % (58/62) concordance for the identification of NTM as compared with the original identification. Three strains were erroneously identified by Speed-Oligo Mycobacteria: one M. kansasii strain was identified as Mycobacterium tuberculosis complex, and one M. chelonae strain and one M. peregrinum strain were both identified as Mycobacterium abscessus. Moreover, one M. chelonae strain was not identified by Speed-Oligo Mycobacteria since it did not react with any species-specific probe. For these strains, sequencing of the genes hsp65, 16S rRNA and rpoB and the GenoType Mycobacterium CM assay were performed. The Speed-Oligo Mycobacteria assay can be a useful tool for the rapid and easy identification of the most common NTM. If applied in clinical practice it could reduce diagnostic delays and contribute to correct clinical and better management of infections caused by NTM.

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“…Opportunistic mycobacteria are commonly recovered from natural and human-influenced environments and can cause disease in humans and animals, especially birds. These characteristics reference them as environmental opportunistic mycobacteria or non-tuberculous mycobacteria (1,2). Environmental opportunistic mycobacteria include slowly growing mycobacteria (colonies usually visible after seven days, such as the Mycobacterium avium intracellulare complex) and rapidly growing mycobacteria (colonies usually visible less than seven days) (1,3).…”

mentioning

confidence: 99%

Micobacteriosis diseminada con compromiso de válvula aórtica protésica: primer caso de Mycobacterium peregrinum de tipo III reportada en Colombia

Torres‐Duque¹,

Diaz²,

Vargas³

et al. 2011

biomedica

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Rapidly growing mycobacteria are non-tuberculous mycobacteria amply present in the environment. Although they are not usually pathogenic for humans, they are opportunistic in that they can cause disease in people with disadvantageous conditions or who are immunocompromised. Mycobacterium peregrinum, an opportunistic, rapidly growing mycobacteria, belongs to the M. fortuitum group and has been reported as responsible for human cases of mycobacteriosis. A case of M. peregrinum type III is herein reported as the first in Colombia. It presented as a disseminated disease involving a prosthetic aortic valve (endocarditis) in a seventeen-year-old girl with a well-established diagnosis of prosthetic aortic valve endocarditis who was referred for a surgical replacement. Due to a congenital heart disease (subaortic stenosis with valve insufficiency), she had two previous aortic valve implantation surgeries. One year after the second implantation, the patient presented with respiratory symptoms and weight lost indicative of lung tuberculosis. A chest X-ray did not show parenchymal compromise but several Ziehl-Neelsen stains were positive. An echocardiography showed a vegetation on the prosthetic aortic valve. In blood and sputum samples, M. peregrinum type III was identified through culture, biochemical tests and hsp65 gene molecular analysis (PRA). The patient underwent a valve replacement and received a multidrug antimycobacterial treatment. Progressive recovery ensued and further samples from respiratory tract and blood were negative for mycobacteria.Key words: Mycobacterium, Mycobacterium peregrinum infections, aortic valve, endocarditis, Colombia. Micobacteriosis diseminada con compromiso de válvula aórtica protésica: primer caso de Mycobacterium peregrinum de tipo III reportada en ColombiaLas micobacterias de rápido crecimiento son microorganismos pertenecientes a las micobacterias no tuberculosas que tienen amplia distribución ambiental. Aunque usualmente no son patógenas para los humanos, en condiciones desfavorables, pueden causar enfermedad en la población general o en huéspedes inmunocomprometidos, por lo cual se consideran oportunistas. Mycobacterium preregrinum es una micobacteria de rápido crecimiento perteneciente al complejo fortuitum que ha sido reportado como responsable de casos de micobacteriosis en humanos. Se presenta el caso de una micobacteriosis por M. peregrinum de tipo III, el primero reportado en Colombia, en una paciente de 17 años de edad con una endocarditis de una válvula aórtica protésica, implantada inicialmente por estenosis subaórtica congénita con insuficiencia y, posteriormente, por estenosis aórtica relacionada con la válvula inicialmente implantada. Un año después del segundo implante, presentó sintomas respiratorios y pérdida de peso sugestivos de tuberculosis pulmonar. Las coloraciones de Ziehl-Neelsen del esputo fueron positivas aunque la radiografía de tórax no mostró compromiso del parénquima. En el ecocardiograma se encontró una vegetación en la válvula aórtica. En las muestras...

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Mycobacterial Infections Caused by Nontuberculous Mycobacteria

Cited by 48 publications

References 74 publications

Defining mycobacteria: Shared and specific genome features for different lifestyles

Defining mycobacteria: Shared and specific genome features for different lifestyles

Evaluation of the Speed-Oligo Mycobacteria assay for the identification of nontuberculous mycobacteria

Micobacteriosis diseminada con compromiso de válvula aórtica protésica: primer caso de Mycobacterium peregrinum de tipo III reportada en Colombia

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