Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1236821 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR32740549_1.fastq.gz | Fastqsanger.gz | |||
| SRR32740549_2.fastq.gz | Fastqsanger.gz | |||
| SRR32740550_1.fastq.gz | Fastqsanger.gz | |||
| SRR32740550_2.fastq.gz | Fastqsanger.gz | |||
| SRR32740551_1.fastq.gz | Fastqsanger.gz |
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Project description:Mycobacterium abscessus [M. abscessus (sensu lato) or M. abscessus group] comprises three closely related taxa with taxonomic status under revision: M. abscessus sensu stricto, M. bolletii and M. massiliense. We describe here a simple, robust and cost effective PCR-based method for distinguishing among M. abscessus, M. massiliense and bolletii. Based on the M. abscessus ATCC 19977T genome, discriminatory regions were identified between M. abscessus and M. massiliense from array-based comparative genomic hybridization. A typing scheme using PCR primers designed for four of these locations was applied to 46 well-characterized clinical isolates comprising 29 M. abscessus, 15 M. massiliense and 2 M. bolletii previously identified by multi-target sequencing. Interestingly, 2 isolates unequivocally identified as M. massiliense were shown to have a full length erm(41) instead of the expected gene deletion and showed inducible clarithromycin resistance after 14 days. We propose using this PCR-based typing scheme combined with erm(41) PCR for a straightforward identification of M. abscessus, M. massiliense and M. bolletii and assessment of inducible clarithromycin resistance. This method can be easily implemented into a routine workflow providing subspecies level identification within 24 hours of isolation of M. abscessus group.
2013-07-17 | GSE43629 | GEO
Project description:Mycobacterium abscessus [M. abscessus (sensu lato) or M. abscessus group] comprises three closely related taxa with taxonomic status under revision: M. abscessus sensu stricto, M. bolletii and M. massiliense. We describe here a simple, robust and cost effective PCR-based method for distinguishing among M. abscessus, M. massiliense and bolletii. Based on the M. abscessus ATCC 19977T genome, discriminatory regions were identified between M. abscessus and M. massiliense from array-based comparative genomic hybridization. A typing scheme using PCR primers designed for four of these locations was applied to 46 well-characterized clinical isolates comprising 29 M. abscessus, 15 M. massiliense and 2 M. bolletii previously identified by multi-target sequencing. Interestingly, 2 isolates unequivocally identified as M. massiliense were shown to have a full length erm(41) instead of the expected gene deletion and showed inducible clarithromycin resistance after 14 days. We propose using this PCR-based typing scheme combined with erm(41) PCR for a straightforward identification of M. abscessus, M. massiliense and M. bolletii and assessment of inducible clarithromycin resistance. This method can be easily implemented into a routine workflow providing subspecies level identification within 24 hours of isolation of M. abscessus group. Two-color CGH with 4 independent Mycobacterium clinical isolates and the M massiliense type strain (CCUG 48898) labeled with Cy3 were cohybridized with the M abscessus type strain (ATCC 19977) labeled with Cy5 on a tiling array designed against the M abscessus type strain
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Project description:Mycobacterium abscessus is a major human pathogen, mostly infecting people with pre-existing pathological lung conditions such as cystic fibrosis. Only little is known about the ways M. abscessus regulates its virulence factors and pathogenesis phenotypes. The production of glycopeptidolipids (GPL) is a major determinant of virulence of this bacterium, with clinical isolates that lack GPL synthesis and export generally exhibiting more aggressive clinical behavior. The current paradigm is that GPL production is abolished in vivo via irreversible, spontaneous mutations taking place as part of in-host evolution. Little is known about the mechanisms or extent to which GPL production may be regulated. We have found an unusual TetR-like transcription factor of M. abscessus, mab_1638, identified via screening of a comprehensive transposon-mutant library, that appears to be a strong positive regulator of the entire GPL biosynthesis and export gene cluster through a combination of direct and indirect mechanisms. The inactivation of mab_1638 by a transposon led to stable and visually obvious rough colony morphology, as well as increased virulence in infection models, characteristic of rough, non-GPL-producers. Transcriptome analysis found the mab_1638:tn mutant to have 118 differentially expressed genes, including the GPL locus. It appears mab_1638 encodes an unusual TetR transcription factor required for the production of GPL in M. abscessus and therefore having a profound effect on virulence traits. This finding raises the important possibility that M. abscessus strains appearing smooth in laboratory growth conditions may nonetheless downregulate GPL-cluster genes in other conditions and thus acquire the phenotypic characteristics of rough strains.
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Project description:Mycobacterium abscessus is a major human pathogen, mostly infecting people with pre-existing pathological lung conditions such as cystic fibrosis. Only little is known about the ways M. abscessus regulates its virulence factors and pathogenesis phenotypes. The production of glycopeptidolipids (GPL) is a major determinant of virulence of this bacterium, with clinical isolates that lack GPL synthesis and export generally exhibiting more aggressive clinical behavior. The current paradigm is that GPL production is abolished in vivo via irreversible, spontaneous mutations taking place as part of in-host evolution. Little is known about the mechanisms or extent to which GPL production may be regulated. We have found an unusual TetR-like transcription factor of M. abscessus, mab_1638, identified via screening of a comprehensive transposon-mutant library, that appears to be a strong positive regulator of the entire GPL biosynthesis and export gene cluster through a combination of direct and indirect mechanisms. The inactivation of mab_1638 by a transposon led to stable and visually obvious rough colony morphology, as well as increased virulence in infection models, characteristic of rough, non-GPL-producers. Transcriptome analysis found the mab_1638:tn mutant to have 118 differentially expressed genes, including the GPL locus. It appears mab_1638 encodes an unusual TetR transcription factor required for the production of GPL in M. abscessus and therefore having a profound effect on virulence traits. This finding raises the important possibility that M. abscessus strains appearing smooth in laboratory growth conditions may nonetheless downregulate GPL-cluster genes in other conditions and thus acquire the phenotypic characteristics of rough strains.
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