In silico identification of genes in bacteriophage DNA.

One of the most satisfying aspects of a genome sequencing project is the identification of the genes contained within it.These are of two types: those which encode tRNAs and those which produce proteins. After a general introduction on the properties of protein-encoding genes and the utility of the Basic Local Alignment Search Tool (BLASTX) to identify genes through homologs, a variety of tools are discussed by their creators. These include for genome annotation: GeneMark, Artemis, and BASys; and, for genome comparisons: Artemis Comparison Tool (ACT), Mauve, CoreGenes, and GeneOrder.

JAE: Jemboss Alignment Editor.

UNLABELLED: One of the most basic methods of understanding the biological significance of a sequence is to produce an alignment with related sequences. A vital aspect of correctly aligning sequences is to apply biological intuition through manual editing of an alignment produced by multiple-sequence alignment software. As part of the European Molecular Biology Open Source Software Suite (EMBOSS), a new alignment editor in the Jemboss package is freely available for download. The Jemboss Alignment Editor (JAE) incorporates standard methods of editing, and colouring residues and nucleotides to highlight important regions of interest. JAE also makes use of scoring matrices (PAM and BLOSUM), selected by the user, to display regions of high degrees of similarity and identity. Other tools include the ability to calculate a consensus, a consensus plot (using a selected scoring matrix) and pairwise identities. AVAILABILITY: The JAE can be launched from the webpage (http://emboss.sourceforge.net/Jemboss/).

ACT: the Artemis Comparison Tool.

The Artemis Comparison Tool (ACT) allows an interactive visualisation of comparisons between complete genome sequences and associated annotations. The comparison data can be generated with several different programs; BLASTN, TBLASTX or Mummer comparisons between genomic DNA sequences, or orthologue tables generated by reciprocal FASTA comparison between protein sets. It is possible to identify regions of similarity, insertions and rearrangements at any level from the whole genome to base-pair differences. ACT uses Artemis components to display the sequences and so inherits powerful searching and analysis tools. ACT is part of the Artemis distribution and is similarly open source, written in Java and can run on any Java enabled platform, including UNIX, Macintosh and Windows.

Theatre: A software tool for detailed comparative analysis and visualization of genomic sequence.

Theatre is a web-based computing system designed for the comparative analysis of genomic sequences, especially with respect to motifs likely to be involved in the regulation of gene expression. Theatre is an interface to commonly used sequence analysis tools and biological sequence databases to determine or predict the positions of coding regions, repetitive sequences and transcription factor binding sites in families of DNA sequences. The information is displayed in a manner that can be easily understood and can reveal patterns that might not otherwise have been noticed. In addition to web-based output, Theatre can produce publication quality colour hardcopies showing predicted features in aligned genomic sequences. A case study using the p53 promoter region of four mammalian species and two fish species is described. Unlike the mammalian sequences the promoter regions in fish have not been previously predicted or characterized and we report the differences in the p53 promoter region of four mammals and that predicted for two fish species. Theatre can be accessed at http://www.hgmp.mrc.ac.uk/Registered/Webapp/theatre/.