Transcription profiling of MT1110 cdaR deletion mutant compared to MT1110 of Streptomyces coelicolor
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ABSTRACT:
ORGANISM(S): Streptomyces coelicolor A3(2)
SUBMITTER: unknown unknown
PROVIDER: E-MAXD-14 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
Project description:Time-dependent gene expression patterns during development and antibiotic production on solid growth medium (SMM) comparing a M600 bldA deletion mutant with wild-type M600 of S.coelicolor A3(2). Eight time points matched in all three replicates of both wild-type and mutant were picked to span the entire Streptomyces growth curve.
2008-06-05 | E-MAXD-27 | biostudies-arrayexpress
Project description:In Streptomyces coelicolor the SigR sigma factor controls genes involved in coping with the deleterious formation of disulphide bonds in cellular proteins. This experiment provides global gene expression patterns of M600 and J2139 (sigR deletion) grown in NMMP plus glucose medium to mid-log phase then treated with diamide. The data reveal that sigR activates, directly or indirectly, more than 65 transcription units, encoding functions that include thiol-disulphide oxidoreductases, thiol buffers, and ATP-dependent proteases. The sigR regulon partially overlaps the ClgR and HspR regulons, that include functions for protein degradation and protein refolding. Diamide also leads to the transient down-regulation of central metabolic gene expression, in particular ribosomal protein expression.
2010-12-21 | E-MAXD-57 | biostudies-arrayexpress
Project description:Comaprison of PBMCs from patients with systemic juvenile idiopathic arthritis during active and inactive disease
2007-03-31 | E-MEXP-987 | biostudies-arrayexpress
Project description:Introduction Community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) are increasingly isolated, with USA300-0114 being the predominant clone in the USA. Comparative whole genome sequencing of USA300 isolates collected in 2002, 2003 and 2005 showed a limited number of single nucleotide polymorphisms and regions of difference. This suggests that USA300 has undergone rapid clonal expansion without great genomic diversification. However, whole genome comparison of CA-MRSA has been limited to isolates belonging to USA300. The aim of this study was to compare the genetic repertoire of different CA-MRSA clones with that of HA-MRSA from the USA and Europe through comparative genomic hybridization (CGH) to identify genetic clues that may explain the successful and rapid emergence of CA-MRSA. Materials and Methods Hierarchical clustering based on CGH of 48 MRSA isolates from the community and nosocomial infections from Europe and the USA revealed dispersed clustering of the 19 CA-MRSA isolates. This means that these 19 CA-MRSA isolates do not share a unique genetic make-up. Only the PVL genes were commonly present in all CA-MRSA isolates. However, 10 genes were variably present among 14 USA300 isolates. Most of these genes were present on mobile elements. Conclusion The genetic variation present among the 14 USA300 isolates is remarkable considering the fact that the isolates were recovered within one month and originated from a confined geographic area, suggesting continuous evolution of this clone. Data is also available from <ahref=http://bugs.sgul.ac.uk/E-BUGS-108 target=_blank>BuG@Sbase</a>
2011-04-15 | E-BUGS-108 | biostudies-arrayexpress
Project description:Data is also available from <ahref=http://bugs.sgul.ac.uk/E-BUGS-96 target=_blank>BuG@Sbase</a>
2010-10-08 | E-BUGS-96 | biostudies-arrayexpress
Project description:Background. During infection, pneumococci exist mainly in sessile biofilms rather than in planktonic form, except during sepsis. However, relatively little is known about how biofilms contribute to pneumococcal pathogenesis. Methods. We performed a biofilm assay and mouse infection experiments on opaque and transparent variants of a clinical serotype 19F strain. Results. After 4 days incubation, scanning electron microscopy revealed that opaque biofilm bacteria produced an extracellular matrix, whereas the transparent variant did not. The opaque biofilm-derived bacteria translocated from the nasopharynx to the lungs and brain of mice, and showed 100-fold greater in vitro adherence to A549 cells. Microarray analysis of planktonic and sessile bacteria from transparent and opaque variants showed differential gene expression in two operons: the lic operon, involved in choline uptake, and in the two-component system, ciaRH. Mutants of these genes did not form an extracellular matrix, could not translocate from the nasopharynx to the lungs or the brain, and adhered poorly to A549 cells. Conclusions. We conclude that only the opaque phenotype is able to form extracellular matrix, and that the lic operon and ciaRH contribute to this process. We propose that during infection, extracellular matrix formation enhances the ability of pneumococci to cause invasive disease. Data is also available from http://bugs.sgul.ac.uk/E-BUGS-117
2011-04-20 | E-BUGS-117 | biostudies-arrayexpress
Project description:Data is also available from http://bugs.sgul.ac.uk/E-BUGS-51
2007-09-06 | E-BUGS-51 | biostudies-arrayexpress
Project description:Subclass IIa bacteriocins have strong antilisterial activity and can control the growth of Listeria monocytogenes in food. However, L. monocytogenes may develop resistance towards such bacteriocins. In this follow-up study, the transcriptomes of a high level (L502-1) and a low level (L502-6) spontaneous sakacin P-resistant mutant strain of L. monocytogenes were compared to the wild-type (L502). The growth of the resistant strains was reduced on mannose but not affected on cellobiose and the transcriptomics was performed during growth on these sugars. The mannose phosphotransferase system (PTS) encoded by the mptACD operon (mpt) is known for transporting mannose and also act as a receptor to class IIa bacteriocins. The mpt was repressed in L502-1 and this is in accordance with abolition of the bacteriocin receptor with resistance to class IIa bacteriocins. In contrast, the mpt was induced in L502-6. Despite the induction of the mpt, L502-6 showed 1,000 times more resistance phenotype and reduced growth on mannose suggesting the mannose-PTS may not be functional in L502-6. The microarray data suggests the presence of other transcriptional responses that may be linked to the sakacin P resistance phenotype particularly in L502-6. Most of commonly regulated genes encode proteins involved in transport and energy metabolism. The resistant strains displayed shift in general carbon catabolite control possibly mediated by the mpt. Our data suggest that the resistant strains may have a reduced virulence potential. Growth sugar- and mutant-specific responses were also revealed. The two resistant strains also displayed difference in stability of the sakacin P resistance phenotype, growth in the presence of both the lytic bacteriophage P100 and activated charcoal. Taken together, the present study showed that a single time exposure to the class IIa bacteriocin sakacin P may elicit contrasting phenotypic and transcriptome responses in L. monocytogenes possibly through regulation of the mpt. Data is also available from <ahref=http://bugs.sgul.ac.uk/E-BUGS-110 target=_blank>BuG@Sbase</a>
2011-04-15 | E-BUGS-110 | biostudies-arrayexpress
Project description:Genome sequencing of Mycobacterium tuberculosis complex members has accelerated the search for new disease control tools. Antigen mining is one area that has benefited enormously from access to genome data. Here genes that were identified by transcriptome analysis as upregulated in response to an in vitro acid shock were screened for their in vivo expression profile and antigenicity. We show that the genes encoding two methyltransferases of Mycobacterium bovis, Mb1438c and Mb1440c, were highly upregulated in a mouse model of infection, and were antigenic in cattle infected with M.bovis. To define the regulation of the genes encoding these antigens we constructed a mutant that was deleted for their putative regulator, and showed that loss of the regulator led to increased expression of the flanking methyltransferases. This work has therefore generated both applied and fundamental outputs, with the description of novel mycobacterial antigens that can now be moved into field trials, but also with the description of a regulatory network that is responsive to both in vivo and in vitro stimuli. Data is also available from <ahref=http://bugs.sgul.ac.uk/E-BUGS-59 target=_blank>BuG@Sbase</a>
2008-01-09 | E-BUGS-59 | biostudies-arrayexpress
Project description:Combination of reverse- and chemical genetic screens reveals a network of novel angiogenesis inhibitors and targets Drug target identification and validation are bottlenecks in the drug discovery process. Accordingly there is a need to develop new methods to facilitate the development of much-needed innovative drugs. We have combined reverse- and chemical genetics to identify new targets modulating blood vessel development. Through mRNA expression profiling in mice we identified 155 drugable gene products that were enriched in the microvasculature. Orthologs of 50 of these candidates were knocked down in a reverse genetic screen in zebrafish. 16 of the 50 genes encoded products that affected angiogenesis. In parallel, screening of 300 known drugs and pharmacologically active compounds in a human cell-based angiogenesis assay identified 11 angiogenesis inhibitors. Strikingly the reverse- and chemical genetic screens identified an overlap of three gene products of the same superfamily of serine/threonine protein phosphatases and two compounds targeting that family. Furthermore, the gene products identified in the reverse genetic screen comprise an interacting network with the targets of the chemical genetic screen. Thus, combining reverse- and chemical genetic screens is a powerful approach to identify novel biological processes and drug targets in vertebrates. Keywords: Cell-type comparison 24 samples were analyzed, representing 8 sample groups. In every sample group, three biological replicates were hybridized separately. The microarrays were hybridized with a Cy3-labeled sample and Cy-5 labeled Common Reference (Universal Mouse Reference RNA, cat. No.: 740100, Stratagene) simultaneously.
2010-05-18 | E-GEOD-10035 | biostudies-arrayexpress