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Genomic Loss of Penicillin-Binding Protein 3 in Burkholderia pseudomallei Confers Clinical Resistance to Ceftazidime

ABSTRACT: Array-CGH analysis and Burkholderia pseudomallei isolates pre and post ceftazidime relapse.

ORGANISM(S): Burkholderia pseudomallei Burkholderia pseudomallei K96243

PROVIDER: GSE25832 | GEO | 2011/10/07

SECONDARY ACCESSION(S): PRJNA135743

REPOSITORIES: GEO

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Genomic Loss of Penicillin-Binding Protein 3 in Burkholderia pseudomallei Confers Clinical Resistance to Ceftazidime

Project description:Array-CGH analysis and Burkholderia pseudomallei isolates pre and post ceftazidime relapse. Genomic DNA from both the parental strains and variant strains were labeled with Cy3 or Cy5 fluorescent dyes and hybridized onto a customized microarray with probes designed from the reference Bp K96243 genome. Log2 signal ratios of parental strain over the variant strains were then computed after normalization to find genomic loss or gain in the variant strains.

2011-10-06 | E-GEOD-25832 | biostudies-arrayexpress

Transcriptomics analysis during the transient ceftazidime tolerance of Burkholderia pseudomallei

Project description:B. pseudomallei strain K96243 is sensitive to the drug ceftazidime (CAZ), but has been shown to exhibit transient CAZ tolerance when in a biofilm form. To investigate an observed shift in gene expression profile during ceftazidime (CAZ) tolerance and to better understand the mechanistic aspects of this transient tolerance, RNA-sequencing was performed on B. pseudomallei K96243 from the following three growth states: planktonic-free, biofilm, and planktonic shedding cells. Results indicated that the expression of 651 genes (10.97%) were significantly changed in both biofilm (resistant) and planktonic shedding (sensitive) cells in comparison to the planktonic state. Burkholderia biofilm shifts its transcriptome in response to ceftazidime exposure by regulating iron-sulfur stabilizing and metabolic-related genes.

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The expression of virulence and antimicrobial related proteins in different Burkholderia mallei and Burkholderia pseudomallei isolates

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Project description:We report the application of single-molecule-based sequencing technology for high-throughput profiling of DNA methylations in Burkholderia pseudomallei.

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The Condition-Dependent Transcriptional Landscape of Burkholderia pseudomallei

Project description:Bacterial transcriptomes are dynamic, context-specific and condition-dependent. Infection by the soil bacterium, Burkholderia pseudomallei, causes melioidosis, an often fatal infectious disease of humans and animals. Possessing a large multi-chromosomal genome, B. pseudomallei is able to persist and survive in a multitude of environments. To obtain a comprehensive overview of B. pseudomallei expressed transcripts, we initiated whole-genome transcriptome profiling covering a broad spectrum of conditions and exposures – a so-called “condition compendium”. Using the compendium, we confirmed many previously-annotated genes and operons, and also identified hundreds of novel transcripts including anti-sense transcripts and non-coding RNAs. By systematically examining genes exhibiting highly similar expression patterns, we ascribed putative functions to previously uncharacterized genes, and identified novel regulatory elements controlling these expression patterns. We also used the compendium to elucidate candidate virulence pathways associated with quorum-sensing and infection in mice. Our study showcases the power of a B. pseudomallei condition compendium as a valuable resource for understanding microbial physiology and the pathogenesis of melioidosis.

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