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Bioinformatics Vol. 17 no. 7 2001
Pages 660-661
© 2001 Oxford University Press


Applications Note

ADAPTSITE: detecting natural selection at single amino acid sites

Yoshiyuki Suzuki 1,*, Takashi Gojobori 2 and Masatoshi Nei 1

1 Institute of Molecular Evolutionary Genetics and Department of Biology, Pennsylvania State University, 328 Mueller Laboratory, University Park, PA 16802, USA
2 Center for Information Biology, National Institute of Genetics, 1111 Yata, Mishima-shi, Shizuoka-ken 411-8540, Japan

Received on January 15, 2001 ; revised on March 9, 2001 ; accepted on March 15, 2001

Summary: ADAPTSITE is a program package for detecting natural selection at single amino acid sites, using a multiple alignment of protein-coding sequences for a given phylogenetic tree. The program infers ancestral codons at all interior nodes, and computes the total numbers of synonymous (cS) and nonsynonymous (cN) substitutions as well as the average numbers of synonymous (sS) and nonsynonymous (sN) sites for each codon site. The probabilities of occurrence of synonymous and nonsynonymous substitutions are approximated by sS / (sS + sN) and sN / (sS + sN), respectively. The null hypothesis of selective neutrality is tested for each codon site, assuming a binomial distribution for the probability of obtaining cS and cN.

Availability: ADAPTSITE is available free of charge at the World-Wide Web sites http://mep.bio.psu.edu/adaptivevol.html and http://www.cib.nig.ac.jp/dda/yossuzuk/welcome.html. The package includes the source code written in C, binary files for UNIX operating systems, manual, and example files.

Contact: yis1{at}psu.edu

* To whom correspondence should be addressed.


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