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. 2021 Jun 16;11:12726. doi: 10.1038/s41598-021-92125-y

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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/.

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Occurrence of introns and free-standing ORFs in hybrids and parental yeasts. Sections originating from S. cerevisiae are marked in red and those originating from S. paradoxus are marked in blue. Introns and free standing ORFs known as mobile, in S. cerevisiae and their homologs in S. paradoxus are filled long triangles³⁵. Introns and free-standing ORFs with at least one motif characteristic for the homing endonucleases (LAGLIDADG, GIY-YIG, etc.) are filled small triangles. Introns without reading frame are white; with truncated ORF interrupted by stop codon are striped. Numbers indicate the base preceding the intron insertion site in the CDS. Positions of introns, known as mobile, in S. cerevisiae are marked in bold; I—group I introns, II—group II introns. ORF1, ORF4 free standing open reading frames. Introgressed parts are in rectangles.