Biomedical subjects

Rasmus Steinkamp

Publications and source records attributed to Rasmus Steinkamp.

4 recordsLinked to original sources

PubMed2005

Multiple alignment of genomic sequences using CHAOS, DIALIGN and ABC.

Comparative analysis of genomic sequences is a powerful approach to discover functional sites in these sequences. Herein, we present a WWW-based software system for multiple alignment of genomic sequences. We use the local alignment tool CHAOS to rapidly identify chains of pairwise similarities. These similarities are used as anchor points to speed up the DIALIGN multiple-alignment program. Finally, the visualization tool ABC is used for interactive graphical representation of the resulting multiple alignments. Our software is available at Göttingen Bioinformatics Compute Server (GOBICS) at http://dialign.gobics.de/chaos-dialign-submission.

Computer Graphics↗

PubMed2004

Multiple sequence alignment with user-defined constraints at GOBICS.

Most multi-alignment methods are fully automated, i.e. they are based on a fixed set of mathematical rules. For various reasons, such methods may fail to produce biologically meaningful alignments. Herein, we describe a semi-automatic approach to multiple sequence alignment where biological expert knowledge can be used to influence the alignment procedure. The user can specify parts of the sequences that are biologically related to each other; our software program uses these sites as anchor points and creates a multiple alignment respecting these user-defined constraints. By using known functionally, structurally or evolutionarily related positions of the input sequences as anchor points, our method can produce alignments that reflect the true biological relationships among the input sequences more accurately than fully automated procedures can do.

Algorithms↗

PubMed2004

The CHAOS/DIALIGN WWW server for multiple alignment of genomic sequences.

Cross-species sequence comparison is a powerful approach to analyze functional sites in genomic sequences and many discoveries have been made based on genomic alignments. Herein, we present a WWW-based software system for multiple alignment of large genomic sequences. Our server utilizes the previously developed combination of CHAOS and DIALIGN to achieve both speed and alignment accuracy. CHAOS is a fast database search tool that creates a list of local sequence similarities. These are used by DIALIGN as anchor points to speed up the final alignment procedure. The resulting alignment is returned to the user in different formats together with a list of anchor points found by CHAOS. The CHAOS/DIALIGN software is freely available at http://dialign.gobics.de/chaos-dialign-submission.

Genomics↗

PubMed2004

AUGUSTUS: a web server for gene finding in eukaryotes.

We present a www server for AUGUSTUS, a novel software program for ab initio gene prediction in eukaryotic genomic sequences. Our method is based on a generalized Hidden Markov Model with a new method for modeling the intron length distribution. This method allows approximation of the true intron length distribution more accurately than do existing programs. For genomic sequence data from human and Drosophila melanogaster, the accuracy of AUGUSTUS is superior to existing gene-finding approaches. The advantage of our program becomes apparent especially for larger input sequences containing more than one gene. The server is available at http://augustus.gobics.de.

Animals↗