Project description:The purpose of the present study was to investigate the impact of heat stress for increasing imipenem susceptibility in imipenem resistant nontypeable Haemophilus influenzae (NTHi).
Project description:Nontypeable Haemophilus influenzae (NTHi) is a common causative organism of acute otitis media (AOM) in children. A human cDNA microarray comprising 30,968 human genome probes was used to evaluate the transcriptional changes that occur in peripheral blood mononuclear cells (PBMC) at the onset of clinical AOM caused by NTHi infection in children after comparison of microarray results with the pre-infection healthy stage of the same children.
Project description:Gene expresison profiles of the R2866 WT and R2866Δ0112 mutant gorwn 7 hours in supplemented brain-heart infusion medium. This experiment was conducted to determine the effects of R2866_0112 gene deletion on overall gene expression profile. The results from this study are further discussed in: Modified lipooligosaccharide structure protects nontypeable Haemophilus influenzae from IgM-mediated complement killing in experimental otitis media. Langereis JD, Stol K, Schweda EK, Twelkmeyer B, Bootsma HJ, de Vries SP, Burghout P, Diavatopoulos DA, Hermans PW. MBio. 2012 Jul 3;3(7):e00079-12. doi: 10.1128/mBio.00079-12. Print 2012.
Project description:Gene expresison profiles of the R2866 WT and R2866Δ0112 mutant gorwn 4 hours in supplemented brain-heart infusion medium. This experiment was conducted to determine the effects of R2866_0112 gene deletion on overall gene expression profile. The results from this study are further discussed in: Modified lipooligosaccharide structure protects nontypeable Haemophilus influenzae from IgM-mediated complement killing in experimental otitis media. Langereis JD, Stol K, Schweda EK, Twelkmeyer B, Bootsma HJ, de Vries SP, Burghout P, Diavatopoulos DA, Hermans PW. MBio. 2012 Jul 3;3(4):e00079-12. doi: 10.1128/mBio.00079-12. Print 2012.
Project description:We used an in vitro evolved strain of nontypeable Haemophilus influenzae (NTHI) to examine the metabolic contributions to persistence RNASeq analysis identified 55 transcripts that significantly changed in amount within in vitro biofilms formed by RM33, as compared to the parental strain. Expression of genes encoding all enzymes within the tryptophan and glycogen pathways was significantly increased in biofilms formed by RM33 and the parental strains. In addition, increases were observed in metabolite transport, adhesin production and DNA metabolism, while we observed pyruvate ato have a pivotal role in the metabolic pathways associated with persistence.
Project description:Transcriptome analysis of NTHi 86-028NPrpsL, NTHi 86-028NPrpsL∆fur, and NTHi 86-028NPrpsL∆fur(pT-fur) strains Nontypeable Haemophilus influenzae (NTHi) is a commensal microorganism of the normal human nasopharyngeal flora, yet also an opportunistic pathogen of the upper and lower respiratory tracts. Changes in gene expression patterns in response to host microenvironments are likely critical for survival. One such system of gene regulation is the ability to carefully regulate iron uptake. A central regulatory system that controls iron uptake, mediated by the ferric uptake regulator Fur, is present in multiple bacteria, including NTHi. To understand the regulation of iron homeostasis in NTHi, fur was deleted in the NTHi strain 86-028NPrpsL. Using RNA-Seq, we identified both protein-encoding and small RNA genes whose expression was repressed or activated by Fur. Overall design: These data comprise transcriptional anaylses of an rpsL mutant of 86-028NP, an isogenic fur mutant of 86-028NPrpsL and a complemented fur mutant strain. All strains were grown in defined medium containing 10 µg/ml human hemoglobin to mid-log phase. Cells were then harvested and RNA extracted. A total of three biological replicates were generated for these analyses. Analysis of transcriptomes using the Illumina HiSeq 2000 of three strains of nontypeable Haemophilus influenzae which include NTHi 86-028NPrpsL, NTHi 86-028NPrpsL∆fur, and NTHi 86-028NPrpsL∆fur(pT-fur) strains. For each strain three biological replicates were analyzed
