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A novel method of characterizing genetic sequences: genome space with biological distance and applications

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Title: A novel method of characterizing genetic sequences: genome space with biological distance and applications
Author(s): Deng, Mo; Yu, Chenglong; Liang, Qian; He, Rong L.; Yau, Stephen S.-T.
Subject(s): genetic genome space
Abstract: BACKGROUND: Most existing methods for phylogenetic analysis involve developing an evolutionary model and then using some type of computational algorithm to perform multiple sequence alignment. There are two problems with this approach: (1) different evolutionary models can lead to different results, and (2) the computation time required for multiple alignments makes it impossible to analyse the phylogeny of a whole genome. This motivates us to create a new approach to characterize genetic sequences. METHODOLOGY: To each DNA sequence, we associate a natural vector based on the distributions of nucleotides. This produces a one-to-one correspondence between the DNA sequence and its natural vector. We define the distance between two DNA sequences to be the distance between their associated natural vectors. This creates a genome space with a biological distance which makes global comparison of genomes with same topology possible. We use our proposed method to analyze the genomes of the new influenza A (H1N1) virus, human rhinoviruses (HRV) and mammalian mitochondrial. The result shows that a triple-reassortant swine virus circulating in North America and the Eurasian swine virus belong to the lineage of the influenza A (H1N1) virus. For the HRV and mammalian mitochondrial genomes, the results coincide with biologists' analyses. CONCLUSIONS: Our approach provides a powerful new tool for analyzing and annotating genomes and their phylogenetic relationships. Whole or partial genomes can be handled more easily and more quickly than using multiple alignment methods. Once a genome space has been constructed, it can be stored in a database. There is no need to reconstruct the genome space for subsequent applications, whereas in multiple alignment methods, realignment is needed to add new sequences. Furthermore, one can make a global comparison of all genomes simultaneously, which no other existing method can achieve.
Issue Date: 2011-03-02
Publisher: Public Library of Science
Citation Info: Deng, M., Yu, C., Liang, Q., He, R. L., & Yau, S. S. 2011. A novel method of characterizing genetic sequences: genome space with biological distance and applications. PLoS One, 6(3): e17293. DOI:10.1371/journal.pone.0017293.
Type: Article
Description: 2011 Deng et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. The original source for this publication is at Public Library of Science; DOI:10.1371/journal.pone.0017293
ISSN: 1932-6203
Date Available in INDIGO: 2011-05-27

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