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Transcriptomes of ΔrelAspoT and ΔdksA mutants of Haemophilus ducreyi in mid-log, transition, and stationary phase

ABSTRACT: To better understand the role of the (p)ppGpp-mediated stringent response in control of H. ducreyi virulence determinants, here we defined genes potentially regulated by either (p)ppGpp or DksA by using RNA-seq. We were able to show that loss of either (p)ppGpp or DksA resulted in dysregulation of multiple genes including several known virulence determinants. We also show that loss of (p)ppGpp or DksA resulted in differential expression of putative H. ducreyi small RNAs.

ORGANISM(S): [Haemophilus] ducreyi 35000HP

PROVIDER: GSE67202 | GEO | 2015/06/04

SECONDARY ACCESSION(S): PRJNA279254

REPOSITORIES: GEO

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Transcriptomes of ΔrelAspoT and ΔdksA mutants of Haemophilus ducreyi in mid-log, transition, and stationary phase

Project description:To better understand the role of the (p)ppGpp-mediated stringent response in control of H. ducreyi virulence determinants, here we defined genes potentially regulated by either (p)ppGpp or DksA by using RNA-seq. We were able to show that loss of either (p)ppGpp or DksA resulted in dysregulation of multiple genes including several known virulence determinants. We also show that loss of (p)ppGpp or DksA resulted in differential expression of putative H. ducreyi small RNAs. RNA of Haemophilus ducreyi wildtype, relAspoT and dksA mutants were collected at mid-log, transition, and stationary phases of growth, in quadruplicate using stranded RNA -seq.

2015-06-04 | E-GEOD-67202 | biostudies-arrayexpress

Transcriptomes of 35000HP, ΔcpxA, ΔcpxR mutant strains of Haemophilus ducreyi in mid-log, transition, and stationary phase

Project description:To better understand the role of H. ducreyi CpxRA in controlling virulence determinants, here we defined genes potentially regulated by CpxRA by using RNA-Seq. Activation of CpxR by deletion of cpxA repressed nearly 70% of its targets, including seven established virulence determinants. Inactivation of CpxR by deletion of cpxR differentially regulated few genes and increased the expression of one virulence determinant. We identified a CpxR binding motif that was enriched in downregulated but not upregulated targets. These data reinforce the hypothesis that CpxA phosphatase activity plays a critical role in controlling H. ducreyi virulence in vivo. Characterization of the downregulated genes may offer new insights into pathogenesis.

2015-11-21 | GSE75237 | GEO

Transcriptomes of 35000HP, ÎcpxA, ÎcpxR mutant strains of Haemophilus ducreyi in mid-log, transition, and stationary phase

2015-11-21 | E-GEOD-75237 | biostudies-arrayexpress

Haemophilus ducreyi transcriptome during human infection

Project description:To better understand the molecular mechanisms underlying Haemophilus ducreyi infection in humans, here we determined the transcriptional profile of H. ducreyi in human lesions using RNA-Seq and compared it to that of in vitro growth. We were able to show that the in vivo transcriptome did not resemble that of in vitro growth. Compared to the inoculum, H. ducreyi harvested from pustules differentially expressed ~120 genes, of which 68 were upregulated. A large proportion of the upregulated genes encoded homologs of proteins involved in nutrient transport, alternative carbon pathways, growth arrest response, heat shock response, and DNA recombination. H. ducreyi upregulated few genes or operons (hgbA, flp-tad, and lspB-lspA2) required for human infection; expression of these genes is known to increase under nutrient stress. Homologs of several genes involved in anaerobic metabolism and ascorbate utilization were upregulated in vivo, suggesting that the organism is adjusting its metabolism to anaerobiosis in vivo.

2015-11-21 | GSE75236 | GEO

Haemophilus ducreyi 35000HPhfq relative to 35000HP

Project description:The goal of this study was to compare the global trascription profile of a Haemophilus ducreyi hfq deletion mutant to that of the wild type parental strain.

2014-03-07 | GSE44535 | GEO

Haemophilus ducreyi 35000HPfis relative to 35000HP

Project description:The goal of this study was to compare the global trascription profile of a Haemophilus ducreyi fis deletion mutant to that of the wild type parental strain.

2013-11-04 | GSE44413 | GEO

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Haemophilus ducreyi transcriptome during human infection

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Haemophilus ducreyi 35000HPcpxA gene expression relative to 35000HP

Project description:Comparative analysis of the global gene expression of a Haemophilus ducreyi 35000HP cpxA deletion mutant relative to the wild type strain

2011-05-03 | GSE21788 | GEO

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