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Molecular Biology and Evolution, Vol 16, 1315-1328, Copyright © 1999 by Society for Molecular Biology and Evolution


ORIGINAL ARTICLE

A method for detecting positive selection at single amino acid sites

Y Suzuki and T Gojobori
Center for Information Biology, National Institute of Genetics, Mishima, Japan.

A method was developed for detecting the selective force at single amino acid sites given a multiple alignment of protein-coding sequences. The phylogenetic tree was reconstructed using the number of synonymous substitutions. Then, the neutrality was tested for each codon site using the numbers of synonymous and nonsynonymous changes throughout the phylogenetic tree. Computer simulation showed that this method accurately estimated the numbers of synonymous and nonsynonymous substitutions per site, as long as the substitution number on each branch was relatively small. The false-positive rate for detecting the selective force was generally low. On the other hand, the true-positive rate for detecting the selective force depended on the parameter values. Within the range of parameter values used in the simulation, the true-positive rate increased as the strength of the selective force and the total branch length (namely the total number of synonymous substitutions per site) in the phylogenetic tree increased. In particular, with the relative rate of nonsynonymous substitutions to synonymous substitutions being 5.0, most of the positively selected codon sites were correctly detected when the total branch length in the phylogenetic tree was > or = 2.5. When this method was applied to the human leukocyte antigen (HLA) gene, which included antigen recognition sites (ARSs), positive selection was detected mainly on ARSs. This finding confirmed the effectiveness of the present method with actual data. Moreover, two amino acid sites were newly identified as positively selected in non-ARSs. The three-dimensional structure of the HLA molecule indicated that these sites might be involved in antigen recognition. Positively selected amino acid sites were also identified in the envelope protein of human immunodeficiency virus and the influenza virus hemagglutinin protein. This method may be helpful for predicting functions of amino acid sites in proteins, especially in the present situation, in which sequence data are accumulating at an enormous speed.
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Mol Biol EvolHome page
Y. Suzuki and M. Nei
Reliabilities of Parsimony-based and Likelihood-based Methods for Detecting Positive Selection at Single Amino Acid Sites
Mol. Biol. Evol., December 1, 2001; 18(12): 2179 - 2185.
[Abstract] [Full Text] [PDF]


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Mol Biol EvolHome page
S. N. Avedisov, I. B. Rogozin, E. V. Koonin, and B. J. Thomas
Rapid Evolution of a Cyclin A Inhibitor Gene, roughex, in Drosophila
Mol. Biol. Evol., November 1, 2001; 18(11): 2110 - 2118.
[Abstract] [Full Text] [PDF]


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J. Virol.Home page
H. Badrane and N. Tordo
Host Switching in Lyssavirus History from the Chiroptera to the Carnivora Orders
J. Virol., September 1, 2001; 75(17): 8096 - 8104.
[Abstract] [Full Text] [PDF]


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GeneticsHome page
Y. Wang and X. Gu
Functional Divergence in the Caspase Gene Family and Altered Functional Constraints: Statistical Analysis and Prediction
Genetics, July 1, 2001; 158(3): 1311 - 1320.
[Abstract] [Full Text] [PDF]


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Proc. Natl. Acad. Sci. USAHome page
W. J. Swanson, A. G. Clark, H. M. Waldrip-Dail, M. F. Wolfner, and C. F. Aquadro
Evolutionary EST analysis identifies rapidly evolving male reproductive proteins in Drosophila
PNAS, June 7, 2001; (2001) 131568198.
[Abstract] [Full Text] [PDF]


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Proc. Natl. Acad. Sci. USAHome page
W. J. Swanson, Z. Yang, M. F. Wolfner, and C. F. Aquadro
Positive Darwinian selection drives the evolution of several female reproductive proteins in mammals
PNAS, February 15, 2001; (2001) 51605998.
[Abstract] [Full Text]


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GeneticsHome page
D. T. Haydon, A. D. Bastos, N. J. Knowles, and A. R. Samuel
Evidence for Positive Selection in Foot-and-Mouth Disease Virus Capsid Genes From Field Isolates
Genetics, January 1, 2001; 157(1): 7 - 15.
[Abstract] [Full Text]


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Mol Biol EvolHome page
N. D. Young and C. W. dePamphilis
Purifying Selection Detected in the Plastid Gene matK and Flanking Ribozyme Regions Within a Group II Intron of Nonphotosynthetic Plants
Mol. Biol. Evol., December 1, 2000; 17(12): 1933 - 1941.
[Abstract] [Full Text] [PDF]


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J. Virol.Home page
Y. Yamaguchi-Kabata and T. Gojobori
Reevaluation of Amino Acid Variability of the Human Immunodeficiency Virus Type 1 gp120 Envelope Glycoprotein and Prediction of New Discontinuous Epitopes
J. Virol., May 1, 2000; 74(9): 4335 - 4350.
[Abstract] [Full Text]


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Proc. Natl. Acad. Sci. USAHome page
W. J. Swanson, Z. Yang, M. F. Wolfner, and C. F. Aquadro
Positive Darwinian selection drives the evolution of several female reproductive proteins in mammals
PNAS, February 27, 2001; 98(5): 2509 - 2514.
[Abstract] [Full Text] [PDF]


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Proc. Natl. Acad. Sci. USAHome page
W. J. Swanson, A. G. Clark, H. M. Waldrip-Dail, M. F. Wolfner, and C. F. Aquadro
Evolutionary EST analysis identifies rapidly evolving male reproductive proteins in Drosophila
PNAS, June 19, 2001; 98(13): 7375 - 7379.
[Abstract] [Full Text] [PDF]



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