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Bioinformatics Vol. 18 no. 3 2002
Pages 452-464
© 2002 Oxford University Press

Multiple sequence alignment using partial order graphs

Christopher Lee 1,*, Catherine Grasso 1,2 and Mark F. Sharlow 1

1 Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095-1570, USA

Received on August 3, 2001 ; revised on September 26, 2001 ; accepted on October 9, 2001

Motivation: Progressive Multiple Sequence Alignment (MSA) methods depend on reducing an MSA to a linear profile for each alignment step. However, this leads to loss of information needed for accurate alignment, and gap scoring artifacts.

Results: We present a graph representation of an MSA that can itself be aligned directly by pairwise dynamic programming, eliminating the need to reduce the MSA to a profile. This enables our algorithm (Partial Order Alignment (POA)) to guarantee that the optimal alignment of each new sequence versus each sequence in the MSA will be considered. Moreover, this algorithm introduces a new edit operator, homologous recombination, important for multidomain sequences. The algorithm has improved speed (linear time complexity) over existing MSA algorithms, enabling construction of massive and complex alignments (e.g. an alignment of 5000 sequences in 4 h on a Pentium II). We demonstrate the utility of this algorithm on a family of multidomain SH2 proteins, and on EST assemblies containing alternative splicing and polymorphism.

Availability: The partial order alignment program POA is available at http://www.bioinformatics.ucla.edu/poa.

Contact: leec{at}mbi.ucla.edu

* To whom correspondence should be addressed.

2 Current address: center for Applied Mathematics, 657 Rhodes Hall, Cornell University, Ithaca NY 14853, USA.


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