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. 2021 Aug 4;21:153. doi: 10.1186/s12862-021-01882-x

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© The Author(s) 2021

Open AccessThis 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 — Landscapes of GC% and GARP% in Eutheria and Metatheria. For each of the 15,727 genes included in this comparative analysis we calculated GC content (GC%) and relative occurrence of glycine, alanine, arginine and proline in predicted proteins (GARP%). Gene data were integrated with the values of surrounding genes (50 genes on each side). Alternating grey and white zones demarcate individual chromosomes. In a–c, genes were ordered according to a Eutherian (Homo sapiens) genome, while in d–f the gene order was Metatherian (Monodelphis domestica). a-b) GC% (black) and GARP% (green) landscape distribution for a Eutherian (Felis catus; cat, a) and a Metatherian (Phascolarctos cinereus; koala, b). c A heatmap of the GC% landscape for all 12 Eutheria and 4 Metatherian in the following order: 1 Sus scrofa, 2 Equus asinus, 3 Orcinus orca, 4 Felis catus domestica, 5 Cricetulus griseus, 6 Rattus norvegicus, 7 Oryctolagus cuniculus, 8 Callithrix jacchus, 9 Trichechus manatus latirostris, 10 Loxodonta africana, 11 Chrysochloris asiatica, 12 Orycteropus afer afer, 13 Vombatus ursinus, 14 Sarcophilus harrisii, 15 Phascolarctos cinereus, 16 Monodelphis domestica. In the gene ranking of both genomes a distinct Eutherian and Metatherian GC% landscape can be discerned