Shioya K.,University of Caen Lower Normandy |
Michaux C.,University of Caen Lower Normandy |
Kuenne C.,Justus Liebig University |
Hain T.,Justus Liebig University |
And 5 more authors.
PLoS ONE | Year: 2011
Small RNA molecules (sRNAs) are key mediators of virulence and stress inducible gene expressions in some pathogens. In this work we identify sRNAs in the Gram positive opportunistic pathogen Enterococcus faecalis. We characterized 11 sRNAs by tiling microarray analysis, 5′ and 3′ RACE-PCR, and Northern blot analysis. Six sRNAs were specifically expressed at exponential phase, two sRNAs were observed at stationary phase, and three were detected during both phases. Searches of putative functions revealed that three of them (EFA0080_EFA0081 and EFB0062_EFB0063 on pTF1 and pTF2 plasmids, respectively, and EF0408_EF04092 located on the chromosome) are similar to antisense RNA involved in plasmid addiction modules. Moreover, EF1097_EF1098 shares strong homologies with tmRNA (bi-functional RNA acting as both a tRNA and an mRNA) and EF2205_EF2206 appears homologous to 4.5S RNA member of the Signal Recognition Particle (SRP) ribonucleoprotein complex. In addition, proteomic analysis of the ΔEF3314_EF3315 sRNA mutant suggests that it may be involved in the turnover of some abundant proteins. The expression patterns of these transcripts were evaluated by tiling array hybridizations performed with samples from cells grown under eleven different conditions some of which may be encountered during infection. Finally, distribution of these sRNAs among genome sequences of 54 E. faecalis strains was assessed. This is the first experimental genome-wide identification of sRNAs in E. faecalis and provides impetus to the understanding of gene regulation in this important human pathogen. © 2011 Shioya et al. Source
Klein T.,Vienna University of Technology |
Niklas J.,Genedata AG |
Heinzle E.,Saarland University
Journal of Industrial Microbiology and Biotechnology | Year: 2015
Metabolic bottlenecks play an increasing role in yeasts and mammalian cells applied for high-performance production of proteins, particularly of pharmaceutical ones that require complex posttranslational modifications. We review the present status and developments focusing on the rational metabolic engineering of such cells to optimize the supply chain for building blocks and energy. Methods comprise selection of beneficial genetic modifications, rational design of media and feeding strategies. Design of better producer cells based on whole genome-wide metabolic network analysis becomes increasingly possible. High-resolution methods of metabolic flux analysis for the complex networks in these compartmented cells are increasingly available. We discuss phenomena that are common to both types of organisms but also those that are different with respect to the supply chain for the production and secretion of pharmaceutical proteins. © 2015, Society for Industrial Microbiology and Biotechnology. Source
Rossnerova A.,Academy of Sciences of the Czech Republic |
Tulupova E.,Academy of Sciences of the Czech Republic |
Tulupova E.,Charles University |
Tabashidze N.,Academy of Sciences of the Czech Republic |
And 5 more authors.
Mutation Research - Fundamental and Molecular Mechanisms of Mutagenesis | Year: 2013
Gene expression levels are significantly regulated by DNA methylation. Differences in gene expression profiles in the populations from various locations with different environmental conditions were repeatedly observed. In this study we compare the methylation profiles in 200 blood samples of children (aged 7-15 years) with and without bronchial asthma from two regions in the Czech Republic with different levels of air pollution (a highly polluted Ostrava region and a control Prachatice region). Samples were collected in March 2010 when the mean concentrations of benzo[a]pyrene (B[a]P) measured by stationary monitoring were 10.1±2.4ng/m3 in Ostrava Bartovice (5.6 times higher than in the control region). Significantly higher concentrations of other pollutants (benzene, NO2, respirable air particles and metals) were also found in Ostrava. We applied the Infinium Methylation Assay, using the Human Methylation 27K BeadChip with 27,578 CpG loci for identification of the DNA methylation pattern in studied groups. Results demonstrate a significant impact of different environmental conditions on the DNA methylation patterns of children from the two regions. We found 9916 CpG sites with significantly different methylation (beta value) between children from Ostrava vs. Prachatice from which 58 CpG sites had differences >10%. The methylation of all these 58 CpG sites was lower in children from polluted Ostrava, which indicates a higher gene expression in comparison with the control Prachatice region. We did not find a difference in DNA methylation patterns between children with and without bronchial asthma in individual locations, but patterns in both asthmatics and healthy children differed between Ostrava and Prachatice. Further, we show differences in DNA methylation pattern depending on gender and urinary cotinine levels. Other factors including length of gestation, birth weight and length of full breastfeeding are suggested as possible factors that can impact the DNA methylation pattern in future life. © 2013 Elsevier B.V. Source
De Juan Romero C.,University Miguel Hernandez |
Bruder C.,Karolinska Institutet |
Bruder C.,Genedata AG |
Tomasello U.,University Miguel Hernandez |
And 2 more authors.
EMBO Journal | Year: 2015
Gyrencephalic species develop folds in the cerebral cortex in a stereotypic manner, but the genetic mechanisms underlying this patterning process are unknown. We present a large-scale transcriptomic analysis of individual germinal layers in the developing cortex of the gyrencephalic ferret, comparing between regions prospective of fold and fissure. We find unique transcriptional signatures in each germinal compartment, where thousands of genes are differentially expressed between regions, including ~80% of genes mutated in human cortical malformations. These regional differences emerge from the existence of discrete domains of gene expression, which occur at multiple locations across the developing cortex of ferret and human, but not the lissencephalic mouse. Complex expression patterns emerge late during development and map the eventual location of folds or fissures. Protomaps of gene expression within germinal layers may contribute to define cortical folds or functional areas, but our findings demonstrate that they distinguish the development of gyrencephalic cortices. Synopsis Complex patterns of gene expression emerge in germinal layers during early cortical development of gyrencephalic animals. These modular expression patterns map the eventual location of folds and fissures. Microarray analysis of developing ferret cerebral cortex reveals transcriptomic differences between prospective folds and fissures. Differential gene expression delineates mosaic patterns along proliferative zones prior to the emergence of folds. Some mosaics of gene expression correlate with the prospective location of folds versus fissures. Differentially expressed genes in our microarray analysis include 80% of those mutated in human cortical malformations. Complex patterns of gene expression emerge in germinal layers during early cortical development of gyrencephalic animals. These modular expression patterns map the eventual location of folds and fissures. © 2015 The Authors. Published under the terms of the CC BY NC ND 4.0 license. Source
D'Alia D.,University of Groningen |
Nieselt K.,University of Tubingen |
Steigele S.,University of Tubingen |
Steigele S.,Genedata AG |
And 3 more authors.
Journal of Bacteriology | Year: 2010
Overexpression of antisense chromosomal cis-encoded noncoding RNAss (ncRNAs) in glutamine synthetase I resulted in a decrease in growth, protein synthesis, and antibiotic production in Streptomyces coelicolor. In addition, we predicted 3,597 cis-encoded ncRNAs and validated 13 of them experimentally, including several ncRNAs that are differentially expressed in bacterial hormone-defective mutants. Copyright © 2010, American Society for Microbiology. All Rights Reserved. Source