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. 2021 Feb 3;13(4):evab016. doi: 10.1093/gbe/evab016

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© The Author(s) 2021. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Fig. 1. — Varying number of tRNA genes in vertebrate genomes. (A) The phylogenetic tree (left) illustrates the evolutionary ancestry of Eupasseres (Eu), Passeriformes (Pa), Neoaves (Na), Galloanseres (Ga), Palaeognathae (Pg) within birds (brown), reptiles (green), mammals (orange), amphibians (yellow), fishes (blue), and yeast (grey). The horizontal bar plot shows the number of standard tRNA genes per genome (color-coded by vertebrate class) and TE-associated tRNAs families (black). Genomes marked by an asterisk indicate low-quality assemblies. Drawings of bird species investigated further in this study are inserted and scaled according to their height. (B) The density plot (top) shows the distribution (curve) and the median value (dot) of tRNA genes per vertebrate genome. (C) The boxplot displays the ratio of the number of protein-coding and tRNA genes per vertebrate genome. Plots correlating avian tRNA gene number to (D) genome size, (E) GC content, (F) weight (log-scale) (Dunning 2007) of females (red) and males (blue), (G) form of locomotion, and (H) geographic origin.