Bioinformatics Vol. 16 no. 2 2000
Pages 130-134
© 2000 Oxford University Press
TOPAL 2.0: improved detection of mosaic sequences within multiple alignments
1 Isaac Newton Institute for Mathematical
Sciences, 20 Clarkson Road, Cambridge CB3 0EH, UK
2 Biomathematics and Statistics Scotland,
Scottish Crop Research Institute, Dundee DD2 5DA, UK
Present address: Department of Applied Statistics, PO Box 240, Harry Pitt Building, University of Reading, Reading RG6 6FN, UK
To whom correspondence should be addressed.
Motivation: The Dss statistic was proposed by (Mol. Biol. Evol., 14, 11251131, McGuire et al. (1997)) for scanning data sets for the presence of recombination, an important step in some phylogenetic analyses. The statistic, however, could not distinguish well between among-site rate variation and recombination, and had no statistical test for significant values. This paper addresses these shortfalls.
Results: A modification to the Dss statistic is proposed which accounts for rate variation to a large extent. A statistical test, based on parametric bootstrapping, is also suggested.
Availability: The TOPAL package (version 2) may be accessed from http://www.bioss.sari.ac.uk/~frank/Geneticsand by anonymous ftp from ftp://ftp.bioss.sari.ac.ukin the directory pub/phylogeny/topal.
Contact: frank{at}bioss.sari.ac.uk
Received on June 28, 1999
; revised on August 18, 1999
; accepted on August 23, 1999
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