Accurate multiple sequence-structure alignment of RNA sequences using combinatorial optimization Bauer, MarkusKlau, Gunnar W.Reinert, KnutUniversität <Berlin, Freie Universität> / Fachbereich Mathematik und Informatik
Accurate multiple sequence-structure alignment of RNA sequences using combinatorial optimization
Klau, Gunnar W.
Universität <Berlin, Freie Universität> / Fachbereich Mathematik und Informatik
Freie Universität Berlin, Fachbereich Mathematik und Informatik : Ser. B, Informatik ; 07,06
005 Computer programming, programs, data
Background: The discovery of functional non-coding RNA sequences has led to an increasing interest in algorithms related to RNA analysis. Traditional sequence alignment algorithms, however, fail at computing reliable alignments of low-homology RNA sequences. The spatial conformation of RNA sequences largely determines their function, and therefore RNA alignment algorithms have to take structural information into account.
Results: We present a graph-based representation for sequence-structure alignments, which we model as an integer linear program (ILP). We sketch how we compute an optimal or near-optimal solution to the ILP using methods from combinatorial optimization, and present results on a recently published benchmark set for RNA
Conclusions: The implementation of our algorithm yields better alignments in terms of two published scores than the other programs that we tested: This is especially the case with an increasing number of input sequences. Our program LaRA is freely available from http://www.planet-lisa.net.
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