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. 2021 Mar 4;22:153. doi: 10.1186/s12864-021-07441-4

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Heart miRNAs in vertebrates. Species ID is indicated at left. Known miRNAs are miRNAs with orthologs identified based on sequence similarity with miRNAs annotated in miRBase and MirGeneDB. Novel miRNAs are putative miRNAs identified in each species by our pipeline. Known families are based on miRBase and MirGeneDB annotations. Heart Morphology is a simplified representation of heart for each group of vertebrates (fishes: two-chambered heart and ectothermy; amphibians: three-chambered heart and ectothermy; reptiles: representative of the Lepidossauria clade presenting a three-chambered heart with partial division at the ventricle and ectothermy; birds: representatives of the Archosauria clade with four-chambered heart and endothermy; mammals: four-chambered heart and endothermy). TGD is Teleost-specific Genome Duplication. SGD is Salmonid-specific Genome Duplication. The phylogenetic tree is a handmade tree derived by merging tree available at TimeTree resource [30] and trees published by [31–33]