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Novel Phylogenetic Network Inference by Combining Maximum Likelihood and Hidden Markov Models

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Algorithms in Bioinformatics (WABI 2008)

Part of the book series: Lecture Notes in Computer Science ((LNBI,volume 5251))

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Abstract

Horizontal Gene Transfer (HGT) is the event of transferring genetic material from one lineage in the evolutionary tree to a different lineage. HGT plays a major role in bacterial genome diversification and is a significant mechanism by which bacteria develop resistance to antibiotics. Although the prevailing assumption is of complete HGT, cases of partial HGT (which are also named chimeric HGT) where only part of a gene is horizontally transferred, have also been reported, albeit less frequently.

In this work we suggest a new probabilistic model for analyzing and modeling phylogenetic networks, the NET-HMM. This new model captures the biologically realistic assumption that neighboring sites of DNA or amino acid sequences are not independent, which increases the accuracy of the inference. The model describes the phylogenetic network as a Hidden Markov Model (HMM), where each hidden state is related to one of the network’s trees. One of the advantages of the NET-HMM is its ability to infer partial HGT as well as complete HGT. We describe the properties of the NET-HMM, devise efficient algorithms for solving a set of problems related to it, and implement them in software. We also provide a novel complementary significance test for evaluating the fitness of a model (NET-HMM) to a given data set.

Using NET-HMM we are able to answer interesting biological questions, such as inferring the length of partial HGT’s and the affected nucleotides in the genomic sequences, as well as inferring the exact location of HGT events along the tree branches. These advantages are demonstrated through the analysis of synthetical inputs and two different biological inputs.

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Authors and Affiliations

  1. Dept. of Mathematics and Computer Science, Netanya Academic College, Netanya

    Sagi Snir

  2. School of Computer Science, Tel Aviv University,  

    Tamir Tuller

Authors
  1. Sagi Snir
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  2. Tamir Tuller
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Editor information

Keith A. Crandall Jens Lagergren

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© 2008 Springer-Verlag Berlin Heidelberg

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Snir, S., Tuller, T. (2008). Novel Phylogenetic Network Inference by Combining Maximum Likelihood and Hidden Markov Models. In: Crandall, K.A., Lagergren, J. (eds) Algorithms in Bioinformatics. WABI 2008. Lecture Notes in Computer Science(), vol 5251. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-87361-7_30

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  • DOI: https://doi.org/10.1007/978-3-540-87361-7_30

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-87360-0

  • Online ISBN: 978-3-540-87361-7

  • eBook Packages: Computer ScienceComputer Science (R0)

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