Constructing the simplest possible phylogenetic network from triplets

L.J.J. Iersel, van, S.M. Kelk

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    A phylogenetic network is a directed acyclic graph that visualizes an evolutionary history containing so-called reticulations such as recombinations, hybridizations or lateral gene transfers. Here we consider the construction of a simplest possible phylogenetic network consistent with an input set T, where T contains at least one phylogenetic tree on three leaves (a triplet) for each combination of three taxa. To quantify the complexity of a network we consider both the total number of reticulations and the number of reticulations per biconnected component, called the level of the network. We give polynomial-time algorithms for constructing a level-1 respectively a level-2 network that contains a minimum number of reticulations and is consistent with T (if such a network exists). In addition, we show that if T is precisely equal to the set of triplets consistent with some network, then we can construct such a network with smallest possible level in time O(|T| k+1), if k is a fixed upper bound on the level of the network. Keywords: Phylogenetics – Polynomial-time algorithm – Phylogenetic networks – Triplets – Minimising reticulations
    Original languageEnglish
    Pages (from-to)207-235
    Number of pages29
    Issue number2
    Publication statusPublished - 2011


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