Cited by 525Genomics and Phylogenetic StudiesProtist diversity and phylogenyEvolution and Paleontology Studies

Contentious relationships in phylogenomic studies can be driven by a handful of genes

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Shen, Xing-Xing, Hittinger, Chris Todd, Rokas, Antonis·2017·Nature Ecology & Evolution

Abstract

Phylogenomic studies have resolved countless branches of the tree of life, but remain strongly contradictory on certain, contentious relationships. Here, we use a maximum likelihood framework to quantify the distribution of phylogenetic signal among genes and sites for 17 contentious branches and 6 well-established control branches in plant, animal and fungal phylogenomic data matrices. We find that resolution in some of these 17 branches rests on a single gene or a few sites, and that removal of a single gene in concatenation analyses or a single site from every gene in coalescence-based analyses diminishes support and can alter the inferred topology. These results suggest that tiny subsets of very large data matrices drive the resolution of specific internodes, providing a dissection of the distribution of support and observed incongruence in phylogenomic analyses. We submit that quantifying the distribution of phylogenetic signal in phylogenomic data is essential for evaluating whether branches, especially contentious ones, are truly resolved. Finally, we offer one detailed example of such an evaluation for the controversy regarding the earliest-branching metazoan phylum, for which examination of the distributions of gene-wise and site-wise phylogenetic signal across eight data matrices consistently supports ctenophores as the sister group to all other metazoans.

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Crossref · 10.1038/s41559-017-0126

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  • The study assessed robustness of age estimates by running analyses under autocorrelated and uncorrelated relaxed molecular-clock models, three fossil calibration sets, three root age priors (800, 1000, 1360 Ma), and three alternative placements of Ctenophora.

    “In order to assess the robustness of our age estimates to a number of prior assumptions, we ran analyses under (1) an autocorrelated and an uncorrelated relaxed molecular-clock model – the former assuming that the rate of molecular evolution of a lineage is correlated with the rate of its mother lineage, the latter allowing completely independent rates from lineage to lineage; (2) three different”

    From Dating early animal evolution using phylogenomic data (2017) · cites this paper as [26]

    The Methods section, “The root of the Metazoan phylogeny” (page unavailable), examines three hypotheses about the earliest-branching metazoan lineage, including alternative relationships involving Ctenophora. But it tests phylogenetic support, not the robustness of age estimates; the searched passages do not report relaxed-clock models, fossil calibration sets, or root-age priors of 800, 1000, and 1360 Ma. (LLM, conf=0.82)

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  • Use of other site-heterogeneous models that may not suffer from problems associated with CAT-F81 resulted in Ctenophora sister to all other animals.

    “Use of other siteheterogeneous models that may not suffer from problems associated with CAT-F81 (see 24 and Supplementary Discussion) resulted in Ctenophora sister to all other animals 21 , consistent with our findings (Fig. 2, Supplementary Fig. S1-S14) and those of two recent papers that employed novel methods 25,26 .”

    From Ctenophore relationships and their placement as the sister group to all other animals (2017) · cites this paper as [26]

    The Results section (‘What is the earliest branch of the metazoan phylogeny?’; page unavailable) reports robust support for Ctenophora as sister to the other animals. The Methods section (‘The root of the Metazoan phylogeny’; page unavailable) describes constraint maximum-likelihood analyses, not the use of other site-heterogeneous models. The cited paper therefore supports the placement but not the claim about which models produced it or their relationship to CAT-F81. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Analysis methods to assess underlying support in phylogenomic datasets at the level of individual sites and genes have revealed underlying support favouring Ctenophora sister, but so far only under standard site-homogeneous models.

    “This approach has, conversely, revealed underlying support favouring Ctenophora sister4,40, but so far has only been performed under standard site-homogeneous models.”
  • The primary remaining lines of evidence supporting Ctenophora sister, partitioned phylogenomics and measures of underlying support (such as ΔPSlnl values), do not do so when better-fitting site-heterogeneous models are incorporated into the analysis.

    “Here, we have consolidated these findings by directly showing that the primary remaining lines of evidence supporting Ctenophora sister, partitioned phylogenomics4,7 and measures of underlying support (such as ΔPSlnl values)4,40, do not do so when better-fitting site-heterogeneous models are incorporated into the analysis.”
  • The ΔPSlnl strategy has previously shown support for Ctenophora sister, in the form of a greater proportion of sites and gene partitions favouring comb jellies over sponges as the sister group to other animals.

    “This strategy has previously shown support for Ctenophora sister, in the form of a greater proportion of sites and gene partitions favouring comb jellies over sponges as the sister group to other animals4,40.”

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Research works printed but not linked: 1

  1. [62]Miller MA Pfeiffer W Schwartz T Creating the CIPRES Science Gateway for inference of large phylogenetic trees Proceedings of the Gateway Computing Environments Workshop (GCE) 1 8 IEEE 2010

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Authors
Shen, X.-X., Hittinger, C. T., & Rokas, A.
Affiliations
  • Vanderbilt University (US)
  • University of Wisconsin–Madison (US)
Corresponding author
Rokas, Antonis
Venue
Nature Ecology & Evolution
Published
2017-04-10
Volume
1
Issue
5
Pages
126-126
ISSN
2397-334X (ISSN-L)
OpenAlex
W2607411230
Cited by
520
References
62
Citations by year
2026: 25 · 2025: 39 · 2024: 41 · 2023: 49 · 2022: 36 · 2021: 67 · 2020: 70 · 2019: 78 · 2018: 74 · 2017: 41
FWCI
29.45
Type
journal article
Language
en
Open access
Locations
  • Nature Ecology & Evolution (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
Funders
  • National Science Foundation (1442148, BER DE-FC02-07ER64494, 1003258, 1442113)
  • U.S. Department of Energy (FC02-07ER64494, 07ER64494, DEFC0207ER64494, BER DE‐FC02‐07ER64494)
  • U.S. Department of Agriculture (DE-FC02-07ER64494)
  • Vanderbilt University
  • National Institutes of Health
  • National Institute of Food and Agriculture (1003258, DE-FC02-07ER64494)
  • Office of Science (BER DE-FC02-07ER64494, FC02-07ER64494, DEFC0207ER64494)
  • Great Lakes Bioenergy Research Center (BER-DE-FC02-07ER64494, DE‐FC02‐07ER64494)
  • National Institute of Allergy and Infectious Diseases (AI105619, R21AI105619)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protist diversity and phylogeny
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
Keywords
phylogenetic incongruence, ctenophores, phylogenomics, phylogenetic support

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