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Bioinformatics Advance Access published online on June 9, 2006
Bioinformatics, doi:10.1093/bioinformatics/btl280
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© The Author (2006). Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received March 14, 2006
Revised May 8, 2006
Accepted June 2, 2006

Article

Evolutionary simulations to detect functional lineage-specific genes

Isabelle Dupanloup 1 and Henrik Kaessmann 2 *

1 Center for Integrative Genomics, University of Lausanne, CH-1015 Lausanne, Switzerland; New address: Computational and Molecular Population Genetics Lab, Zoological Institute, University of Bern, CH-3012 Bern, Switzerland
2 Center for Integrative Genomics, University of Lausanne, CH-1015 Lausanne, Switzerland

* To whom correspondence should be addressed.
Henrik Kaessmann, E-mail: Henrik.Kaessmann{at}unil.ch


  Abstract

Motivation: Supporting the functionality of recent duplicate gene copies is usually difficult, owing to high sequence similarity between duplicate counterparts and shallow phylogenies, which hamper both the statistical and experimental inference.

Results: We developed an integrated evolutionary approach to identify functional duplicate gene copies and other lineage-specific genes. By repeatedly simulating neutral evolution, our method estimates the probability that an ORF was selectively conserved and is therefore likely to represent a bona fide coding region. In parallel, our method tests whether the accumulation of nonsynonymous substitutions reveals signatures of selective constraint. We show that our approach has high power to identify functional lineage-specific genes using simulated and real data. For example, a coding region of average length (~1,400 bp), restricted to hominoids, can be predicted to be functional in ~94-100% of cases. Notably, the method may support functionality for instances where classical selection tests based on the ratio of nonsynonymous to synonymous substitutions fail to reveal signatures of selection. Our method is available as an automated tool, ReEVOLVER, which will also be useful to systematically detect functional lineage-specific genes of closely-related species on a large scale.

Availability: ReEVOLVER is available at: http://www.unil.ch/cig/page7858.html.

Associate Editor: Martin Bishop
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