Lsr2, a pleiotropic regulator at the core of the infectious strategy of Mycobacterium abscessus [ChIP-seq]
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1001309 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR25491352_1.fastq.gz | Fastqsanger.gz | |||
| SRR25491352_2.fastq.gz | Fastqsanger.gz | |||
| SRR25491353_1.fastq.gz | Fastqsanger.gz | |||
| SRR25491353_2.fastq.gz | Fastqsanger.gz | |||
| SRR25491354_1.fastq.gz | Fastqsanger.gz |
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Similar Datasets
Project description:Mycobacterium abscessus (Mabs) is a fast-growing, non-tuberculous mycobacterium responsible for serious lung infections in patients with cystic fibrosis. This bacterium evolves during the pulmonary infection between a smooth (S) and a rough morphotype (R). We have previously isolated the lsr2 gene as being differentially expressed during the transition between Mabs-S and Mabs-R. lsr2 encodes a pleiotropic transcription factor belonging to the superfamily of nucleoid-associated proteins (NAPs), which play an essential role in the hierarchical organization of bacterial chromosomes. The present study aims to unravel the molecular role of Lsr2 in regulating expression of gene involved in the adaptation and the pathobiology of Mabs using both RNA-Seq and ChIP-seq.
2023-11-30 | GSE239869 | GEO
Project description:Mycobacterium abscessus (Mabs) is a fast-growing, non-tuberculous mycobacterium responsible for serious lung infections in patients with cystic fibrosis. This bacterium evolves during the pulmonary infection between a smooth (S) and a rough morphotype (R). We have previously isolated the lsr2 gene as being differentially expressed during the transition between Mabs-S and Mabs-R. lsr2 encodes a pleiotropic transcription factor belonging to the superfamily of nucleoid-associated proteins (NAPs), which play an essential role in the hierarchical organization of bacterial chromosomes. The present study aims to unravel the molecular role of Lsr2 in regulating expression of gene involved in the adaptation and the pathobiology of Mabs using both RNA-Seq and ChIP-seq.
2023-11-30 | GSE239870 | GEO
Project description:Lsr2, a pleiotropic regulator at the core of the infectious strategy of Mycobacterium abscessus
| PRJNA1001304 | ENA
Project description:Lsr2, a pleiotropic regulator at the core of the infectious strategy of Mycobacterium abscessus [RNA-seq]
| PRJNA1001307 | ENA
Project description:This SuperSeries is composed of the SubSeries listed below.
2023-11-30 | GSE239871 | GEO
Project description:Mycobacterium abscessus is a non-tuberculous mycobacterium, causing lung infections in cystic fibrosis patients. During pulmonary infection, M. abscessus switches from smooth (Mabs-S) to rough (Mabs-R) morphotypes, the latter being hyper-virulent. Previously, we isolated the lsr2 gene as differentially expressed during S-to-R transition. lsr2 encodes a pleiotropic transcription factor that falls under the superfamily of nucleoid-associated proteins. Here, we used two functional genomic methods, RNA-seq and chromatin immunoprecipitation-sequencing (ChIP-seq), to elucidate the molecular role of Lsr2 in the pathobiology of M. abscessus. Transcriptomic analysis shows that Lsr2 differentially regulates gene expression across both morphotypes, most of which are involved in several key cellular processes of M. abscessus, including host adaptation and antibiotic resistance. These results were confirmed through quantitative real-time PCR, as well as by minimum inhibitory concentration tests and infection tests on macrophages in the presence of antibiotics. ChIP-seq analysis revealed that Lsr2 extensively binds the M. abscessus genome at AT-rich sequences and appears to form long domains that participate in the repression of its target genes. Unexpectedly, the genomic distribution of Lsr2 revealed no distinctions between Mabs-S and Mabs-R, implying more intricate mechanisms at play for achieving target selectivity.IMPORTANCELsr2 is a crucial transcription factor and chromosome organizer involved in intracellular growth and virulence in the smooth and rough morphotypes of Mycobacterium abscessus. Using RNA-seq and chromatin immunoprecipitation-sequencing (ChIP-seq), we investigated the molecular role of Lsr2 in gene expression regulation along with its distribution on M. abscessus genome. Our study demonstrates the pleiotropic regulatory role of Lsr2, regulating the expression of many genes coordinating essential cellular and molecular processes in both morphotypes. In addition, we have elucidated the role of Lsr2 in antibiotic resistance both in vitro and in vivo, where lsr2 mutant strains display heightened sensitivity to antibiotics. Through ChIP-seq, we reported the widespread distribution of Lsr2 on M. abscessus genome, revealing a direct repressive effect due to its extensive binding on promoters or coding sequences of its targets. This study unveils the significant regulatory role of Lsr2, intricately intertwined with its function in shaping the organization of the M. abscessus genome.
| S-EPMC10913753 | biostudies-literature
Project description:Mycobacterium abscessus is nowadays under the spotlight of the scientific community. This pathogenic mycobacteria is indeed responsible for a wide spectrum of infections involving mostly pulmonary infections in patients with cystic fibrosis. M. abscessus is intrinsically resistant to a broad range of antibiotics, including most antitubercular drugs, and is considered the most pathogenic and chemotherapy-resistant rapidly growing mycobacterium. Consequently, with very limited treatment options, the development of new therapeutic approaches to fight this pathogen are urgently needed. In this context, 19 oxadiazolone (OX) derivatives have been investigated for their antibacterial activity against both the rough (R) and smooth (S) variants of M. abscessus. Several OXs were active against extracellular M. abscessus growth with moderated minimal inhibitory concentrations (MIC), or intracellularly by inhibiting M. abscessus growth inside infected macrophages with MIC values similar to those of imipenem. Such promising results prompted us to identify the potential target enzymes of the sole extra and intracellular inhibitor of M. abscessus growth, i.e., iBpPPOX via activity-based protein profiling combined with mass spectrometry. This approach led to the identification of 21 potential protein candidates being mostly involved in M. abscessus lipid metabolism and/or in cell wall biosynthesis.
2020-08-14 | PXD015680 | Pride
Project description:Detection of species-specific proteotypic peptides for accurate and easy characterization of infectious non-tuberculous mycobacteria such as Mycobacterium abscessus is essential. Therefore, we carried out reanalysis of publicly available M. abscessus proteomic dataset MSV000085363, PXD015680 and PXD022644 by proteome database search and followed by spectral library generation. The raw DDA data were searched against the M. abscessus proteome database using Proteome Discoverer and FragPipe. The resulting peptide spectrum matches were converted into a spectral library using BiblioSpec.
2024-03-07 | PXD045930 | Pride
Project description:Bacterial nucleoid-associated proteins play important roles in chromosome organization and global gene regulation. We find that Lsr2 of Mycobacterium tuberculosis is a novel nucleoid-associated protein that specifically binds AT-rich regions of the genome, including regions encoding major virulence factors, such as the ESX secretion systems, the lipid virulence factors PDIM/PGL, and the PE/PPE families of antigenic proteins. Comparison of genome-wide binding data with expression data indicates that Lsr2 binding results in transcriptional repression. Domain swamping experiments demonstrate that Lsr2 has an N-terminal dimerization domain and a C-terminal DNA binding domain. NMR analysis of the DNA binding domain of Lsr2 and its interaction with DNA reveals a novel structure and a unique mechanism that enables Lsr2 to discriminately target AT-rich sequences through interactions with the minor groove of DNA. Taken together, we provide evidence that mycobacteria have employed a structurally distinct molecule with an apparently different DNA recognition mechanism to achieve an equivalent function as the Enterobacteriaceae H-NS, coordinating global gene regulation and virulence in this group of medically important bacteria. Comparison of Lsr2 chromatin-immunoprecipitated DNA sequences to total reference DNA
2010-06-19 | E-GEOD-18652 | biostudies-arrayexpress
Project description:To survive a dynamic host environment, Mycobacterium tuberculosis must endure a series of challenges from reactive oxygen and nitrogen stress, to drastic shifts in oxygen availability. The mycobacterial Lsr2 protein has been implicated in reactive oxygen defense via direct protection of DNA. To examine the role of Lsr2 in pathogenesis and physiology of M. tuberculosis, we generated a strain deleted for lsr2. Analysis of the M. tuberculosis ?lsr2 strain demonstrated that Lsr2 is not required for DNA protection, as this strain was as equally susceptible as the wild-type to DNA-damaging agents. The lsr2 mutant did display severe growth defects under normoxic and hyperoxic conditions, but was not required for growth under low oxygen conditions. However, it was also required for adaptation to anaerobiosis. The defect in anaerobic adaptation led to a marked decrease in viability during, as well as a lag in recovery from, anaerobiosis. Gene expression profiling of ?lsr2 under aerobic and anaerobic conditions in conjunction with published DNA binding-site data indicate that Lsr2 is a global transcriptional regulator controlling adaptation to changing oxygen levels. The ?lsr2 strain was capable of establishing an early infection in the Balb/c mouse model; however, it was severely defective in persisting in the lungs and caused no discernible lung pathology. These findings demonstrate M. tuberculosis Lsr2 is a global transcriptional regulator required for control of genes involved in adaptation to extremes in oxygen availability and is required for persistent infection. Wild type H37Rv or lsr2 mutant strains were grown aerobically or in a Rach dormancy model in dubos tween albumin media and analyzed. Alternately, either aerobically grown or Rach model hypoxic samples were challenged with H2O2 samples and harvested 1h later. Experiments were repeated in triplicate or quadruplicate.
2014-05-24 | E-GEOD-57948 | biostudies-arrayexpress