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Nucleic Acids Research, 2003, Vol. 31, No. 21 6214-6220
© 2003 Oxford University Press

Splice site prediction with quadratic discriminant analysis using diversity measure

Lirong Zhang1 and Liaofu Luo*,1,2

1 Laboratory of Theoretical Biophysics, Faculty of Science and Technology, Inner Mongolia University, Hohhot, 010021 China and 2 Center for Theoretical Biology, Peking University, Beijing 100871, China

*To whom correspondence should be addressed. Tel/Fax: +86 471 4951761; Email: lfluo{at}mail.imu.edu.cn

Based on the conservation of nucleotides at splicing sites and the features of base composition and base correlation around these sites we use the method of increment of diversity combined with quadratic discriminant analysis (IDQD) to study the dependence structure of splicing sites and predict the exons/introns and their boundaries for four model genomes: Caenorhabditis elegans, Arabidopsis thaliana, Drosophila melanogaster and human. The comparison of compositional features between two sequences and the comparison of base dependencies at adjacent or non-adjacent positions of two sequences can be integrated automatically in the increment of diversity (ID). Eight feature variables around a potential splice site are defined in terms of ID. They are integrated in a single formal framework given by IDQD. In our calculations 7 (8) base region around the donor (acceptor) sites have been considered in studying the conservation of nucleotides and sequences of 48 bp on either side of splice sites have been used in studying the compositional and base-correlating features. The windows are enlarged to 16 (donor), 29 (acceptor) and 80 bp (either side) to improve the prediction for human splice sites. The prediction capability of the present method is comparable with the leading splice site detector—GeneSplicer.


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[Abstract] [Full Text] [PDF]


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