Level-2 networks from shortest and longest distances

Katharina Huber, Leo van Iersel, Remie Janssen, Mark Jones, Vincent Moulton, Yuki Murakami

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Abstract

Recently it was shown that a certain class of phylogenetic networks, called level-2 networks, cannot be reconstructed from their associated distance matrices. In this paper, we show that they can be reconstructed from their induced shortest and longest distance matrices. That is, if two level-2 networks induce the same shortest and longest distance matrices, then they must be isomorphic. We further show that level-2 networks are reconstructible from their shortest distance matrices if and only if they do not contain a subgraph from a family of graphs. A generator of a network is the graph obtained by deleting all pendant subtrees and suppressing degree-2 vertices. We also show that networks with a leaf on every generator side are reconstructible from their induced shortest distance matrix.

Original languageEnglish
Pages (from-to)138-165
Number of pages28
JournalDiscrete Applied Mathematics
Volume306
Early online date22 Oct 2021
DOIs
Publication statusE-pub ahead of print - 22 Oct 2021

Keywords

  • Distance matrix
  • Level-k network
  • Phylogenetic networks
  • Reconstructibility

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