Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

In vitro transcriptomic comparison of daptomycin-resistant Staphylococcus aureus

ABSTRACT: Mutants from SG511 and NCTC8325 (wild type isolates) resistant to daptomycin were obtained following serial passage experiments in vitro. Transcriptomic experiments showed alteration in the expression of genes involved in various pathways including general metabolism, cell wall regulon and lipid metabolism.

ORGANISM(S): Staphylococcus aureus subsp. aureus N315 Staphylococcus aureus subsp. aureus COL Staphylococcus aureus subsp. aureus Mu50 Staphylococcus aureus subsp. aureus MRSA252 Staphylococcus aureus Staphylococcus aureus subsp. aureus MW2 Staphylococcus aureus subsp. aureus NCTC 8325 Staphylococcus aureus subsp. aureus USA300 Staphylococcus aureus subsp. aureus MSSA476

PROVIDER: GSE50842 | GEO | 2015/11/01

SECONDARY ACCESSION(S): PRJNA219158

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

In vitro transcriptomic comparison of daptomycin-resistant Staphylococcus aureus

Project description:Mutants from SG511 and NCTC8325 (wild type isolates) resistant to daptomycin were obtained following serial passage experiments in vitro. Transcriptomic experiments showed alteration in the expression of genes involved in various pathways including general metabolism, cell wall regulon and lipid metabolism. Microarray was used to evaluate alteration in the transcriptome between wild type strains SG511 and NCTC8325 and their daptomycin resistant isolates, in antibiotic-free medium.

2015-11-01 | E-GEOD-50842 | biostudies-arrayexpress

Proteomic Investigation of Multiple Methicillin-Resistant Staphylococcus aureus strains with distinct Daptomycin Tolerance and Resistance Phenotypes

Project description:Several groups have shown that through evolution experiments, tolerance and resistance evolved rapidly under cyclic antibiotic treatment. In other words, intermittent antibiotic exposure performed in a typical adaptive laboratory evolution (ALE) experiments will “train” the bacteria to become tolerant/resistant to the drug. Using this experimental strategy, we performed in vitro laboratory evolution in MRSA using daptomycin, and mine novel daptomycin tolerance and resistance mutants, which were isolated at specific time points during the evolution experiments. Three daptomycin-tolerant isolates with different tolerance level were generated from our laboratory evolution (TOL2 and TOL5 with a mild-tolerance phenotype, and TOL6 with a high-tolerance phenotype). They all bear mutations at different genes, and have no increase in MIC towards daptomycin. Besides, we also isolated three daptomycin-resistant isolates (RES1, RES2, RES3) that have a single point mutation in the same gene, mprF, but at different locations, leading to an increased MIC towards daptomycin. Through proteomics, we uncovered the differential adaptation strategies of these daptomycin tolerant and resistant MRSA strains, and how they respond differently to antibiotics compared to the ancestral wild-type.

2022-07-14 | PXD026741 | Pride

Transcriptional Profiling of Daptomycin Induced Staphylococcus aureus

Project description:Daptomycin is a lipopeptide antibiotic that has recently been approved for treatment of Gram-positive bacterial infections. The mode of action of daptomycin is not yet entirely clear. To further understand the mechanism transcriptomic analysis of changes in gene expression in daptomycin-treated Staphylococcus aureus was carried out. The expression profile indicated that cell wall stress stimulon member genes (B. J. Wilkinson, A. Muthaiyan, and R. K. Jayaswal. 2005. Curr. Med. Chem. Anti-Infective Agents 4: 259-276) were significantly induced by daptomycin, and by the cell wall-active antibiotics vancomycin and oxacillin. Comparison of the daptomycin response of a two-component cell wall stress stimulon regulator VraSR mutant, S. aureus KVR, to its parent N315 showed diminished expression of the cell wall stress stimulon in the mutant. Daptomycin has been proposed to cause membrane depolarization, and the transcriptional responses to carbonyl cyanide m-chlorophenylhydrazone (CCCP) and nisin were determined. Transcriptional profiles of the responses to these antimicrobial agents showed significantly different patterns compared to those of the cell wall-active antibiotics, including little or no induction of the cell wall stress stimulon. However, there were a significant number of genes induced by both CCCP and daptomycin that were not induced by oxacillin or vancomycin, such that the daptomycin transcriptome was probably reflecting a membrane depolarizing activity of this antimicrobial also. The results indicate that inhibition of peptidoglycan biosynthesis, either directly or indirectly, and membrane depolarization are parts of the mode of action of daptomycin. Keywords: mode of action, transcriptional profiling

2007-12-25 | GSE9494 | GEO

Genomic and Long-Term Transcriptomic Imprints Related to the Daptomycin Mechanism of Action Occurring in Daptomycin- and Methicillin-Resistant Staphylococcus aureus Under Daptomycin Exposure

Project description:Daptomycin (DAP) is the last-resort treatment for heterogeneous Vancomycin-Intermediate-Staphylococcus aureus (hVISA) and Vancomycin-Intermediate-S.aureus (VISA), and DAP-resistance onset which is also linked to reduced vancomycin susceptibility, is an increasing public health problem. To have more insight into the mechanisms of daptomycin resistance, the comparative transcriptomes of two DAP-R (1C-3B) clinical isogenic isolates vs their DAP-S (1A-3A) counterparts were investigated by Illumina RNA-seq, the Rockhopper tool, computational filtering analyses and bioinformatic tools.

2020-08-07 | GSE121797 | GEO

A mutation in PP2C Phosphatase Gene in a Staphylococcus aureus USA300 Clinical Isolate with Reduced Susceptibility to Vancomycin and Daptomycin

2012-08-03 | GSE39868 | GEO

In vitro selection for chitosan-resistant Staphylococcus aureus - phenotypic and molecular characterisation of resistance development

Project description:A mutant of SG511 (wild type isolate), resistant to the presence of chitosan (polycationic molecule) was obtained following serial passage experiments resistance to chitosan exposition. Transcriptomic experiments showed alteration in the expression of genes involved in the cell wall regulon resulting in the modification of susceptibility phenotype against cell wall active antibiotics

2014-07-15 | GSE48912 | GEO

A mutation in PP2C Phosphatase Gene in a Staphylococcus aureus USA300 Clinical Isolate with Reduced Susceptibility to Vancomycin and Daptomycin

Project description:Investigation of baseline transcription activity of two different clinical isolates of Staphylococcus aureus with two different susceptibility levels to the antibiotics Vancomycin and Daptomycin. Two different strains of Staphylococcus aureus, one that is fully Vancomycin and Daptomycin Sensitive and one with decreased Vancomycin and Daptomycin Sensitivity - grown to mid-log phase in rich broth.

2012-08-03 | E-GEOD-39868 | biostudies-arrayexpress

Metabolic and transcriptional activities of Staphylococcus aureus challenged with high-doses of daptomycin

Project description:Treatment of stationary growth phase Staphylococcus aureus SA113 with 100-fold of the MIC of the lipopeptide antibiotic daptomycin leaves alive a small fraction of drug tolerant albeit genetically susceptible bacteria. This study shows that cells of this subpopulation exhibit active metabolism even hours after the onset of the drug challenge. Isotopologue profiling using fully 13C-labeled glucose revealed de novo biosynthesis of the amino acids Ala, Asp, Glu, Ser, Gly and His. The isotopologue composition in Asp and Glu suggested an increased activity of the TCA cycle under daptomycin treatment compared to unaffected stationary growth phase cells. Microarray analysis showed differential expression of specific genes 10 minutes and 3 hours after addition of the drug. Besides factors involved in drug response, a number of metabolic genes appear to shape the signature of daptomycin-tolerant S. aureus cells. These observations will be useful towards the development of new strategies against persisters and related forms of bacterial cells with downshifted physiology.

2014-06-06 | GSE57908 | GEO

Additional Routes to Staphylococcus aureus Daptomycin Resistance as Revealed by Comparative Genome Sequencing, Transcriptional Profiling, and Phenotypic Studies

Project description:Daptomycin is an extensively used anti-staphylococcal agent due to the rise in methicillin-resistant Staphylococcus aureus. However, both laboratory-derived and clinical decreased susceptibility isolates have been described, but the mechanism(s) of resistance is poorly understood. To further understand daptomycin resistance, comparative genome sequencing, transcriptomics, ultrastructure ,and cell envelope studies were carried out on two relatively higher level (4 and 8 ug/ml-1) laboratory-derived daptomycin-resistant strains (strains CB1541 and CB1540 respectively) compared to their methicillin-resistant parent strain (CB1118;MW2). Genes altered in their expression common to both transcriptomes included some involved in glycine betaine accumulation, mscL, ure genes, femH, spa and smpB. However, the CB1541 transcriptome was further characterized by upregulation of various heat shock chaperone and protease genes, consistent with a mutation in clpP, and lytM and sceD. Both strains showed slow growth, and strongly decreased autolytic activity that appeared to be mainly due to decreased autolysin production. In contrast to previous common findings, we did not find any mutations in phospholipid biosynthesis genes, and it appears there are multiple pathways to and factors in daptomycin resistance.

2012-10-01 | GSE40753 | GEO

Metabolic and transcriptional activities of Staphylococcus aureus challenged with high-doses of daptomycin

2014-06-06 | E-GEOD-57908 | biostudies-arrayexpress