@article{KellerFoersterMuelleretal.2010, author = {Keller, Alexander and Foerster, Frank and Mueller, Tobias and Dandekar, Thomas and Schultz, Joerg and Wolf, Matthias}, title = {Including RNA secondary structures improves accuracy and robustness in reconstruction of phylogenetic trees}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-67832}, year = {2010}, abstract = {Background: In several studies, secondary structures of ribosomal genes have been used to improve the quality of phylogenetic reconstructions. An extensive evaluation of the benefits of secondary structure, however, is lacking. Results: This is the first study to counter this deficiency. We inspected the accuracy and robustness of phylogenetics with individual secondary structures by simulation experiments for artificial tree topologies with up to 18 taxa and for divergency levels in the range of typical phylogenetic studies. We chose the internal transcribed spacer 2 of the ribosomal cistron as an exemplary marker region. Simulation integrated the coevolution process of sequences with secondary structures. Additionally, the phylogenetic power of marker size duplication was investigated and compared with sequence and sequence-structure reconstruction methods. The results clearly show that accuracy and robustness of Neighbor Joining trees are largely improved by structural information in contrast to sequence only data, whereas a doubled marker size only accounts for robustness. Conclusions: Individual secondary structures of ribosomal RNA sequences provide a valuable gain of information content that is useful for phylogenetics. Thus, the usage of ITS2 sequence together with secondary structure for taxonomic inferences is recommended. Other reconstruction methods as maximum likelihood, bayesian inference or maximum parsimony may equally profit from secondary structure inclusion. Reviewers: This article was reviewed by Shamil Sunyaev, Andrea Tanzer (nominated by Frank Eisenhaber) and Eugene V. Koonin. Open peer review: Reviewed by Shamil Sunyaev, Andrea Tanzer (nominated by Frank Eisenhaber) and Eugene V. Koonin. For the full reviews, please go to the Reviewers' comments section.}, subject = {Phylogenie}, language = {en} } @article{VainshteinSanchezBrazmaetal.2010, author = {Vainshtein, Yevhen and Sanchez, Mayka and Brazma, Alvis and Hentze, Matthias W. and Dandekar, Thomas and Muckenthaler, Martina U.}, title = {The IronChip evaluation package: a package of perl modules for robust analysis of custom microarrays}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-67869}, year = {2010}, abstract = {Background: Gene expression studies greatly contribute to our understanding of complex relationships in gene regulatory networks. However, the complexity of array design, production and manipulations are limiting factors, affecting data quality. The use of customized DNA microarrays improves overall data quality in many situations, however, only if for these specifically designed microarrays analysis tools are available. Results: The IronChip Evaluation Package (ICEP) is a collection of Perl utilities and an easy to use data evaluation pipeline for the analysis of microarray data with a focus on data quality of custom-designed microarrays. The package has been developed for the statistical and bioinformatical analysis of the custom cDNA microarray IronChip but can be easily adapted for other cDNA or oligonucleotide-based designed microarray platforms. ICEP uses decision tree-based algorithms to assign quality flags and performs robust analysis based on chip design properties regarding multiple repetitions, ratio cut-off, background and negative controls. Conclusions: ICEP is a stand-alone Windows application to obtain optimal data quality from custom-designed microarrays and is freely available here (see "Additional Files" section) and at: http://www.alice-dsl.net/evgeniy. vainshtein/ICEP/}, subject = {Microarray}, language = {en} } @article{FriedrichRahmannWeigeletal.2010, author = {Friedrich, Torben and Rahmann, Sven and Weigel, Wilfried and Rabsch, Wolfgang and Fruth, Angelika and Ron, Eliora and Gunzer, Florian and Dandekar, Thomas and Hacker, Joerg and Mueller, Tobias and Dobrindt, Ulrich}, title = {High-throughput microarray technology in diagnostics of enterobacteria based on genome-wide probe selection and regression analysis}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-67936}, year = {2010}, abstract = {The Enterobacteriaceae comprise a large number of clinically relevant species with several individual subspecies. Overlapping virulence-associated gene pools and the high overall genome plasticity often interferes with correct enterobacterial strain typing and risk assessment. Array technology offers a fast, reproducible and standardisable means for bacterial typing and thus provides many advantages for bacterial diagnostics, risk assessment and surveillance. The development of highly discriminative broad-range microbial diagnostic microarrays remains a challenge, because of marked genome plasticity of many bacterial pathogens. Results: We developed a DNA microarray for strain typing and detection of major antimicrobial resistance genes of clinically relevant enterobacteria. For this purpose, we applied a global genome-wide probe selection strategy on 32 available complete enterobacterial genomes combined with a regression model for pathogen classification. The discriminative power of the probe set was further tested in silico on 15 additional complete enterobacterial genome sequences. DNA microarrays based on the selected probes were used to type 92 clinical enterobacterial isolates. Phenotypic tests confirmed the array-based typing results and corroborate that the selected probes allowed correct typing and prediction of major antibiotic resistances of clinically relevant Enterobacteriaceae, including the subspecies level, e.g. the reliable distinction of different E. coli pathotypes. Conclusions: Our results demonstrate that the global probe selection approach based on longest common factor statistics as well as the design of a DNA microarray with a restricted set of discriminative probes enables robust discrimination of different enterobacterial variants and represents a proof of concept that can be adopted for diagnostics of a wide range of microbial pathogens. Our approach circumvents misclassifications arising from the application of virulence markers, which are highly affected by horizontal gene transfer. Moreover, a broad range of pathogens have been covered by an efficient probe set size enabling the design of high-throughput diagnostics.}, subject = {Mikroarray}, language = {en} } @article{DandekarArgos1994, author = {Dandekar, Thomas and Argos, Patrick}, title = {Amiloride-sensitive epithelial Na\(^+\) channel is made of three homologous subunits}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-29734}, year = {1994}, abstract = {No abstract available}, language = {en} } @article{ArgosDandekar1994, author = {Argos, P. and Dandekar, Thomas}, title = {Delineating the main chain topology of four-helix bundle proteins using the genetic algorithm and knowledge based on the amino acid sequence alone}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-33807}, year = {1994}, abstract = {No abstract available}, subject = {Proteine}, language = {en} } @article{DandekarTollervey1993, author = {Dandekar, Thomas and Tollervey, David}, title = {Identification and functional analysis of a novel yeast small nucleolar RNA}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-29850}, year = {1993}, abstract = {No abstract available}, language = {en} } @article{DandekarTollervey1992, author = {Dandekar, Thomas and Tollervey, David}, title = {Mutational analysis of Schizosaccharomyces pombe U4 snRNA by plasmid exchange}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-29969}, year = {1992}, abstract = {No abstract available}, language = {en} } @article{DandekarTollervey1991, author = {Dandekar, Thomas and Tollervey, D.}, title = {Thirty-three nucleotides of 5' flanking sequence including the TATA box are necessary and sufficient for efficient U2 snRNA transcription in Schizosaccharomycespombe}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-29959}, year = {1991}, abstract = {No abstract available}, language = {en} } @article{DandekarStripeckeGrayetal.1991, author = {Dandekar, Thomas and Stripecke, Renata and Gray, Nicola K. and Goossen, Britta and Constable, Anne and Johansson, Hans E. and Hentze, Matthias W.}, title = {Identification of a novel iron-responsive element in murine and human erythroid \(\delta\)-aminolevulinic acid synthase mRNA}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-29929}, year = {1991}, abstract = {No abstract available}, language = {en} } @article{DandekarSibbald1990, author = {Dandekar, Thomas and Sibbald, Peter R.}, title = {Trans-splicing of pre-mRNA is predicted to occur in a wide range of organisms including vertebrates}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-29798}, year = {1990}, abstract = {No abstract available}, language = {en} } @article{DandekarRibesTollervey1989, author = {Dandekar, Thomas and Ribes, V. and Tollervey, David}, title = {Schizosaccharomyces pombe U4 small nuclear RNA closely resembles vertebrate U4 and is required for growth}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-29771}, year = {1989}, abstract = {No abstract available}, language = {en} } @article{DandekarTollervey1989, author = {Dandekar, Thomas and Tollervey, David}, title = {Cloning of Schizosaccharomyces pombe genes encoding the U1,U2,U3 and U4 snRNAs}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-29919}, year = {1989}, abstract = {No abstract available}, language = {en} } @article{DandekarSchulz1987, author = {Dandekar, Thomas and Schulz, R.}, title = {Evidence for the expression of peptides derived from three opioid precursors in NG 108CC15 hybrid cells}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-29909}, year = {1987}, abstract = {No abstract available}, language = {en} } @article{SchultzMetznerDandekaretal.1986, author = {Schultz, R{\"u}diger and Metzner, Katharina and Dandekar, Thomas and Gramsch, Christian}, title = {Opiates induce long-term increases in prodynorphin derived peptide levels in the guinea-pig myenteric plexus}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-29809}, year = {1986}, abstract = {No abstract available}, language = {en} } @article{DandekarGramschHoughtonetal.1985, author = {Dandekar, Thomas and Gramsch, Christian and Houghton, Richard A. and Schultz, R{\"u}diger}, title = {Affinity purification of \(\beta\)-endorphin-like material from NG108CC15 cells by means of the monoclonal \(\beta\)-endorphin antibody 3-E7}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-29896}, year = {1985}, abstract = {No abstract available}, language = {en} }