Bioinformatics Advance Access published online on March 15, 2005
Bioinformatics, doi:10.1093/bioinformatics/bti376
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1 Max Planck Institute for Molecular Genetics, Ihnestr. 73, 14195 Berlin, Germany
* To whom correspondence should be addressed.
Motivation: Neighbor dependent substitution processes generated specific pattern of dinucleotide frequencies in the genomes of most organisms. The CpG-methylation-deamination process is, for example, a prominent process in vertebrates (CpG-effect). Such processes, often with unknown mechanistic origins, need to be incorporated into realistic models of nucleotide substitutions. Results: Based on a general framework of nucleotide substitutions we develop a method that is able to identify the most relevant neighbor dependent substitution processes, estimate their relative frequencies, and judge their importance to be included into the modeling. Starting from a model for neighbor independent nucleotide substitution we successively add neighbor dependent substitution processes in the order of their ability to increase the likelihood of the model describing given data. The analysis of neighbor dependent nucleotide substitutions based on repetitive elements found in the genomes of human, zebrafish and fruit fly is presented. Availability: A web server to perform the presented analysis is publicly available at: http://evogen.molgen.mpg.de/server/substitution-analysis.
Received November 17, 2004
Revised February 16, 2005
Accepted March 4, 2005
Article
Identification and measurement of neighbor dependent nucleotide substitution processes
2 Physics Department and Center for Theoretical Biological Physics, UC San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0374
Peter F. Arndt, E-mail: arndt{at}molgen.mpg.de
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