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A Practical Guide to Phylogenetics for Nonexperts
Published on: February 5, 2014
Inferring phylogenetic networks by the maximum parsimony criterion: a case study
Guohua Jin1, Luay Nakhleh, Sagi Snir
1Department of Computer Science, Rice University, Houston, Texas, USA.
Molecular Biology and Evolution
|October 28, 2006
Summary
Maximum parsimony (MP) effectively reconstructs phylogenetic networks and detects horizontal gene transfer (HGT) events. This method accurately identifies HGT in complex evolutionary histories, including chimeric genes.
Area of Science:
- Evolutionary Biology
- Bioinformatics
- Computational Biology
Background:
- Horizontal gene transfer (HGT) complicates evolutionary history reconstruction, leading to gene trees that conflict with species trees.
- Phylogenetic networks model evolutionary histories incorporating both vertical inheritance and HGT.
- Previous work introduced a maximum parsimony (MP) criterion for phylogenetic networks and efficient algorithms.
Purpose of the Study:
- To evaluate the performance and robustness of the maximum parsimony (MP) criterion for phylogenetic network reconstruction and HGT detection using biological data.
- To assess the MP criterion's ability to detect HGT events, including in chimeric genes.
- To gain insights into evolutionary histories and HGT scenarios in biological datasets.
Main Methods:
- Application and analysis of the maximum parsimony (MP) criterion for phylogenetic networks on biological datasets.
- Investigation of the criterion's robustness against incomplete taxon sampling and varying site substitution matrices.
- Examination of MP's performance in detecting HGT events within chimeric genes.
Main Results:
- The MP criterion demonstrated high promise in phylogenetic network reconstruction and HGT detection.
- MP accurately identified the number of HGT events necessary to reconcile gene evolutionary histories with the species phylogeny.
- The criterion proved robust to incomplete taxon sampling and different site substitution matrices, and effectively detected HGT in chimeric genes.
Conclusions:
- The maximum parsimony (MP) criterion is a powerful and robust tool for inferring phylogenetic networks and detecting horizontal gene transfer (HGT).
- MP provides valuable insights into complex evolutionary histories, including those involving chimeric genes.
- The findings support the utility of MP for understanding HGT scenarios in diverse biological datasets.
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