TY - Generic T1 - Dynamic querying for pattern identification in microarray and genomic data T2 - 2003 International Conference on Multimedia and Expo, 2003. ICME '03. Proceedings Y1 - 2003 A1 - Hochheiser, H. A1 - Baehrecke, E. H. A1 - Stephen M. Mount A1 - Shneiderman, Ben KW - Bioinformatics KW - data sets KW - Displays KW - dynamic querying KW - expression profiles KW - Frequency KW - Gene expression KW - genes KW - Genetics KW - genomic data KW - Genomics KW - linear ordered sequences KW - macromolecules KW - medical signal processing KW - Mice KW - Microarray KW - pattern identification KW - pattern recognition KW - premRNA splicing KW - Query processing KW - sequences KW - Signal processing KW - splicing KW - TimeSearcher AB - Data sets involving linear ordered sequences are a recurring theme in bioinformatics. Dynamic query tools that support exploration of these data sets can be useful for identifying patterns of interest. This paper describes the use of one such tool - timesearcher - to interactively explore linear sequence data sets taken from two bioinformatics problems. Microarray time course data sets involve expression levels for large numbers of genes over multiple time points. Timesearcher can be used to interactively search these data sets for genes with expression profiles of interest. The occurrence frequencies of short sequences of DNA in aligned exons can be used to identify sequences that play a role in the pre-mRNA splicing. Timesearcher can be used to search these data sets for candidate splicing signals. JA - 2003 International Conference on Multimedia and Expo, 2003. ICME '03. Proceedings PB - IEEE VL - 3 SN - 0-7803-7965-9 ER - TY - JOUR T1 - Analysis of stage-specific gene expression in the bloodstream and the procyclic form of Trypanosoma brucei using a genomic DNA-microarray JF - Molecular and Biochemical ParasitologyMolecular and Biochemical Parasitology Y1 - 2002 A1 - Diehl, Susanne A1 - Diehl, Frank A1 - Najib M. El‐Sayed A1 - Clayton, Christine A1 - Hoheisel, Jörg D. KW - Expression KW - Gene KW - Microarray KW - Regulation KW - Trypanosoma brucei AB - A microarray comprising 21[punctuation space]024 different PCR products spotted on glass slides was constructed for gene expression studies on Trypanosoma brucei. The arrayed fragments were generated from a T. brucei shotgun clone library, which had been prepared from randomly sheared and size-fractionated genomic DNA. For the identification of stage-specific gene activity, total RNA from in vitro cultures of the human, long slender form and the insect, procyclic form of the parasite was labelled and hybridised to the microarray. Approximately 75% of the genomic fragments produced a signal and about 2% exhibited significant differences between the transcript levels in the bloodstream and procyclic forms. A few results were confirmed by Northern blot analysis or reverse-transcription and PCR. Three hundred differentially regulated clones have been selected for sequencing. So far, of 33 clones that showed about 2-fold or more over-expression in bloodstream forms, 15 contained sequences similar to those of VSG expression sites and at least six others appeared non-protein-coding. Of 29 procyclic-specific clones, at least eight appeared not to be protein-coding. A surprisingly large proportion of known regulated genes was already identified in this small sample, and some new ones were found, illustrating the utility of genomic arrays. VL - 123 SN - 0166-6851 ER -