PreprintCited by 61Genomics and Phylogenetic StudiesRNA and protein synthesis mechanismsEvolution and Genetic Dynamics

Scalable empirical mixture models that account for across-site compositional heterogeneity

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Schrempf, Dominik, Lartillot, Nicolas, Szöllősi, Gergely·2019·Molecular Biology and Evolution

Preprint — published as 10.1093/molbev/msaa145

Abstract

Biochemical demands constrain the range of amino acids acceptable at specific sites resulting in across-site compositional heterogeneity of the amino acid replacement process. Phylogenetic models that disregard this heterogeneity are prone to systematic errors, which can lead to severe long branch attraction artifacts. State-of-the-art models accounting for across-site compositional heterogeneity include the CAT model, which is computationally expensive, and empirical distribution mixture models estimated via maximum likelihood (C10 to C60 models). Here, we present a new, scalable method EDCluster for finding empirical distribution mixture models involving a simple cluster analysis. The cluster analysis utilizes specific coordinate transformations which allow the detection of specialized amino acid distributions either from curated databases, or from the alignment at hand. We apply EDCluster to the HOGENOM and HSSP databases in order to provide universal distribution mixture (UDM) models comprising up to 4096 components. Detailed analyses of the UDM models demonstrate the removal of various long branch attraction artifacts and improved performance compared to the C10 to C60 models. Ready-to-use implementations of the UDM models are provided for three established software packages (IQ-TREE, Phylobayes, and RevBayes).

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  • Even more complex models (e.g. UDM models) may yet prove better fitting and more resilient to LBA.

    “In fact, this high prevalence of the most complex models tested here as best fitting for single genes implies that they may still be underfitting the data (see Supplementary Note 1 for a detailed exposition on under- and overfitting in this study), and that even more complex models (e.g. UDM models77), may yet prove better fitting and more resilient to LBA.”

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Authors
Schrempf, D., Lartillot, N., & Szöllősi, G.
Affiliations
  • Eötvös Loránd University (HU)
  • Centre National de la Recherche Scientifique (FR)
Corresponding author
Schrempf, Dominik
Venue
Molecular Biology and Evolution
Publisher
openRxiv
Published
2019-10-07
Volume
37
Issue
12
Pages
3616-3631
ISSN
0737-4038 (ISSN-L)
OpenAlex
W3081516476
Cited by
61
References
65
Citations by year
2026: 13 · 2025: 11 · 2024: 8 · 2023: 11 · 2022: 10 · 2021: 6 · 2020: 2
FWCI
2.35
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Molecular Biology and Evolution (publishedVersion, cc-by-nc)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, other-oa)
Funders
  • Centre Informatique National de l’Enseignement Supérieur (A0040310449)
  • Grand Équipement National De Calcul Intensif
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Evolution and Genetic Dynamics
Keywords
amino acid substitutions, long-branch attraction, phylogenetic model selection, clustering, coordinate transformation, cat model, amino acid substitution rates
MeSH terms
Genetic Techniques, Models, Genetic, Phylogeny, Software, Cluster Analysis, Amino Acid Substitution

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