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. 2018 Jan 22;8:1376. doi: 10.1038/s41598-017-18865-y

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Possible evolutionary scenario of class XIII myosin genes duplications. (A) Representation of 13 putative duplication events (numbered circles) from an ancestral class XIII myosin gene with an unknown primary origin. The order of duplications from 2 to 10 is supported by the phylogeny, while the others are not clear. (B) Possible scenario of evolution where the origin of the first class XIII myosin (yellow star) and duplications 1, 2, 3 and 4 occurred before separation of Kinetoplastida and Herelobosea classes. In this case, some genes were lost in Herelobosea (circles filled with red “X”). (C) Possible scenario of evolution where the origin of the first class XIII myosin (yellow star) and almost all duplication events occurred after separation of the Kinetoplastida and Herelobosea classes. The presence of two copies of this myosin class in Naegleria can be explained by an ancient horizontal transfer event (black arrow) from a kinetoplastid to a Heterolobosea member followed by an event of duplication.