New substitution models for rooting phylogenetic trees

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
Tom A WilliamsT Martin Embley

Abstract

The root of a phylogenetic tree is fundamental to its biological interpretation, but standard substitution models do not provide any information on its position. Here, we describe two recently developed models that relax the usual assumptions of stationarity and reversibility, thereby facilitating root inference without the need for an outgroup. We compare the performance of these models on a classic test case for phylogenetic methods, before considering two highly topical questions in evolutionary biology: the deep structure of the tree of life and the root of the archaeal radiation. We show that all three alignments contain meaningful rooting information that can be harnessed by these new models, thus complementing and extending previous work based on outgroup rooting. In particular, our analyses exclude the root of the tree of life from the eukaryotes or Archaea, placing it on the bacterial stem or within the Bacteria. They also exclude the root of the archaeal radiation from several major clades, consistent with analyses using other rooting methods. Overall, our results demonstrate the utility of non-reversible and non-stationary models for rooting phylogenetic trees, and identify areas where further progress can be made.

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Citations

Sep 2, 2015·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Tom A Williams, T Martin Embley
Feb 2, 2017·PloS One·Evgeny SagulenkoJohn A Fuerst
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Aug 15, 2021·Genome Biology and Evolution·Luiz Thibério RangelGregory P Fournier

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Software Mentioned

K align
rob
C ons
LUCA
MUSCLE
C offee
MAFFT
BMGE

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