Constructing a Smallest Refining Galled Phylogenetic Network

  • Trinh N. D. Huynh
  • Jesper Jansson
  • Nguyen Bao Nguyen
  • Wing-Kin Sung
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3500)


Reticulation events occur frequently in many types of species. Therefore, to develop accurate methods for reconstructing phylogenetic networks in order to describe evolutionary history in the presence of reticulation events is important. Previous work has suggested that constructing phylogenetic networks by merging gene trees is a biologically meaningful approach. This paper presents two new efficient algorithms for inferring a phylogenetic network from a set \(\mathcal{T}\) of gene trees of arbitrary degrees. The first algorithm solves the open problem of constructing a refining galled network for \(\mathcal{T}\) (if one exists) with no restriction on the number of hybrid nodes; in fact, it outputs the smallest possible solution. In comparison, the previously best method (SpNet) can only construct networks having a single hybrid node. For cases where there exists no refining galled network for \(\mathcal{T}\), our second algorithm identifies a minimum subset of the species set to be removed so that the resulting trees can be combined into a galled network. Based on our two algorithms, we propose two general methods named RGNet and RGNet+. Through simulations, we show that our methods outperform the other existing methods neighbor-joining, NeighborNet, and SpNet.


Gene Tree Phylogenetic Network Input Tree Star Graph Gene Dataset 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Trinh N. D. Huynh
    • 1
  • Jesper Jansson
    • 1
  • Nguyen Bao Nguyen
    • 1
  • Wing-Kin Sung
    • 1
  1. 1.School of ComputingNational University of SingaporeSingapore

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