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. 2020 Aug 8;38(1):215–228. doi: 10.1093/molbev/msaa203

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© The Author(s) 2020. 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 License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 7. — Monophyletic origin and divergent evolution of TR structural elements and biogenesis pathways. Simplified phylogenetic trees of major metazoan (A) and eukaryotic (B) lineages shown. Branch lengths do not represent evolutionary distance. (A) Evolution of TR structural elements across metazoan lineages. Loss of RNA secondary structural elements P1.1, P2.1, or P6.1 is indicated in oval. Gain of P2a or P2a.1 is shown in rectangle. Specific events of loss and gain of TR structural elements are marked along the respective metazoan lineages. (B) Divergence of TR biogenesis pathway and transcription machinery across eukaryotes. The TR transcription machinery in each eukaryotic kingdom is indicated as Pol II or Pol III. The size range of TRs from each group is indicated. Biogenesis pathway of respective eukaryotic clades are shown to the right.