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Molecular Biology and Evolution 19:554-562 (2002)
© 2002 Society for Molecular Biology and Evolution

A Comprehensive Vertebrate Phylogeny Using Vector Representations of Protein Sequences from Whole Genomes

Gary W. Stuart, Karen Moffett and Jeffery J. Leader

*Department of Life Sciences, Indiana State University;
{dagger}Department of Mathematics, Rose-Hulman Institute of Technology

We recently developed a method for producing comprehensive gene and species phylogenies from unaligned whole genome data using singular value decomposition (SVD) to analyze character string frequencies. This work provides an integrated gene and species phylogeny for 64 vertebrate mitochondrial genomes composed of 832 total proteins. In addition, to provide a theoretical basis for the method, we present a graphical interpretation of both the original frequency matrix and the SVD-derived matrix. These large matrices describe high-dimensional Euclidean spaces within which biomolecular sequences can be uniquely represented as vectors. In particular, the SVD-derived vector space describes each protein relative to a restricted set of newly defined, independent axes, each of which represents a novel form of conserved motif, termed a correlated peptide motif. A quantitative comparison of the relative orientations of protein vectors in this space provides accurate and straightforward estimates of sequence similarity, which can in turn be used to produce comprehensive gene trees. Alternatively, the vector representations of genes from individual species can be summed, allowing species trees to be produced.


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