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Bioinformatics Advance Access published online on November 30, 2004
Bioinformatics, doi:10.1093/bioinformatics/bti184
Bioinformatics © Oxford University Press 2004; all rights reserved
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Received June 28, 2004
Revised September 15, 2004
Accepted October 8, 2004

Article

A graph based algorithm for generating EST consensus sequences

Ketil Malde 1*, Eivind Coward 1, and Inge Jonassen 2

1 Department of Informatics, University of Bergen
2 Computational Biology Unit, Bergen Centre for Computational Sciences and Department of Informatics, University of Bergen

* To whom correspondence should be addressed.
Ketil Malde, E-mail: ketil{at}ii.uib.no


  Abstract

Motivation: EST sequences constitute an abundant, yet error prone resource for computational biology. Expressed sequences are important in gene discovery and identification, and they are also crucial for the discovery and classification of alternative splicing. An important challenge when processing EST sequences, is the reconstruction of mRNA by assembling EST clusters into consensus sequences.

Results: In contrast to the more established assembly tools, we propose an algorithm that constructs a graph over sequence fragments of fixed size, and produces consensus sequences as traversals of this graph. We provide a tool implementing this algorithm, and perform an experiment where the consensus sequences produced by our implementation, as well as by currently available tools, are compared to mRNA. The results show that our proposed algorithm in a majority of the cases produce consensus of higher quality than the established sequence assemblers and at a competitive speed.

Availability: The source code for the implementation is available under a GPL license from http://www.ii.uib.no/~ketil/bioinformatics/.


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