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Family-Level Sampling of Mitochondrial Genomes in Coleoptera: Compositional Heterogeneity and Phylogenetics

MJ. Timmermans, C. Barton, J. Haran, D. Ahrens, CL. Culverwell, A. Ollikainen, S. Dodsworth, PG. Foster, L. Bocak, AP. Vogler,

. 2015 ; 8 (1) : 161-75. [pub] 20151208

Language English Country England, Great Britain

Document type Journal Article, Research Support, Non-U.S. Gov't

Persistent link   https://www.medvik.cz/link/bmc17000804

Mitochondrial genomes are readily sequenced with recent technology and thus evolutionary lineages can be densely sampled. This permits better phylogenetic estimates and assessment of potential biases resulting from heterogeneity in nucleotide composition and rate of change. We gathered 245 mitochondrial sequences for the Coleoptera representing all 4 suborders, 15 superfamilies of Polyphaga, and altogether 97 families, including 159 newly sequenced full or partial mitogenomes. Compositional heterogeneity greatly affected 3rd codon positions, and to a lesser extent the 1st and 2nd positions, even after RY coding. Heterogeneity also affected the encoded protein sequence, in particular in the nad2, nad4, nad5, and nad6 genes. Credible tree topologies were obtained with the nhPhyML ("nonhomogeneous") algorithm implementing a model for branch-specific equilibrium frequencies. Likelihood searches using RAxML were improved by data partitioning by gene and codon position. Finally, the PhyloBayes software, which allows different substitution processes for amino acid replacement at various sites, produced a tree that best matched known higher level taxa and defined basal relationships in Coleoptera. After rooting with Neuropterida outgroups, suborder relationships were resolved as (Polyphaga (Myxophaga (Archostemata + Adephaga))). The infraorder relationships in Polyphaga were (Scirtiformia (Elateriformia ((Staphyliniformia + Scarabaeiformia) (Bostrichiformia (Cucujiformia))))). Polyphagan superfamilies were recovered as monophyla except Staphylinoidea (paraphyletic for Scarabaeiformia) and Cucujoidea, which can no longer be considered a valid taxon. The study shows that, although compositional heterogeneity is not universal, it cannot be eliminated for some mitochondrial genes, but dense taxon sampling and the use of appropriate Bayesian analyses can still produce robust phylogenetic trees.

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$a Barton, Christopher $u Department of Life Sciences, Natural History Museum, London, United Kingdom.
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$a Ahrens, Dirk $u Department of Life Sciences, Natural History Museum, London, United Kingdom Zoologisches Forschungsmuseum Alexander Koenig Bonn, Bonn, Germany. $7 gn_A_00002539
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$a Culverwell, C Lorna $u Department of Life Sciences, Natural History Museum, London, United Kingdom Present address: Haartman Institute, Haartmaninkatu 3, University of Helsinki, Helsinki, Finland.
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$a Ollikainen, Alison $u Department of Life Sciences, Natural History Museum, London, United Kingdom Present address: Department of Medical Genetics, Genome-Scale Biology Research Program, University of Helsinki, Helsinki, Finland.
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$a Dodsworth, Steven $u Department of Life Sciences, Natural History Museum, London, United Kingdom Present address: Department of Comparative Plant and Fungal Biology, Royal Botanic Gardens, Kew, Richmond, Surrey, United Kingdom.
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$a Foster, Peter G $u Department of Life Sciences, Natural History Museum, London, United Kingdom.
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$a Vogler, Alfried P $u Department of Life Sciences, Natural History Museum, London, United Kingdom Department of Life Sciences, Imperial College London - Silwood Park Campus, Ascot, United Kingdom.
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