Bordewich, M. and Semple, C. (2007) 'Computing the minimum number of hybridisation events for a consistent evolutionary history.', Discrete applied mathematics., 155 (8). pp. 914-928.
It is now well-documented that the structure of evolutionary relationships between a set of present-day species is not necessarily tree-like. The reason for this is that reticulation events such as hybridizations mean that species are a mixture of genes from different ancestors. Since such events are relatively rare, a fundamental problem for biologists is to determine the smallest number of hybridization events required to explain a given (input) set of data in a single (hybrid) phylogeny. The main results of this paper show that computing this smallest number is APX-hard, and thus NP-hard, in the case the input is a collection of phylogenetic trees on sets of present-day species. This answers a problem which was raised at a recent conference (Phylogenetic Combinatorics and Applications, Uppsala University, 2004). As a consequence of these results, we also correct a previously published NP-hardness proof in the case the input is a collection of binary sequences, where each sequence represents the attributes of a particular present-day species. The APX-hardness of these problems means that it is unlikely that there is an efficient algorithm for either computing the result exactly or approximating it to any arbitrary degree of accuracy.
|Keywords:||Rooted phylogenetic tree, Reticulate evolution, Hybrid phylogeny, Phylogenetic network, Agreement forest, Rooted subtree prune and regraft.|
|Full text:||Full text not available from this repository.|
|Publisher Web site:||http://dx.doi.org/10.1016/j.dam.2006.08.008|
|Record Created:||21 Dec 2009 15:35|
|Last Modified:||03 Oct 2016 11:03|
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