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Mitochondrial introgression suggests extensive ancestral hybridization events among Saccharomyces species

View ORCID ProfileDavid Peris, View ORCID ProfileArmando Arias, View ORCID ProfileSandi Orlić, View ORCID ProfileCarmela Belloch, View ORCID ProfileLaura Pérez-Través, View ORCID ProfileAmparo Querol, View ORCID ProfileEladio Barrio
doi: https://doi.org/10.1101/028324
David Peris
1“Cavanilles” Institute of Biodiversity and Evolution, University of Valencia, Valencia, Spain.
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Armando Arias
1“Cavanilles” Institute of Biodiversity and Evolution, University of Valencia, Valencia, Spain.
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Sandi Orlić
1“Cavanilles” Institute of Biodiversity and Evolution, University of Valencia, Valencia, Spain.
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Carmela Belloch
2Department of Food Biotechnology. Institute of Agrochemistry and Food Technology (IATA), CSIC, Valencia, Spain.
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Laura Pérez-Través
2Department of Food Biotechnology. Institute of Agrochemistry and Food Technology (IATA), CSIC, Valencia, Spain.
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Amparo Querol
2Department of Food Biotechnology. Institute of Agrochemistry and Food Technology (IATA), CSIC, Valencia, Spain.
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Eladio Barrio
1“Cavanilles” Institute of Biodiversity and Evolution, University of Valencia, Valencia, Spain.
2Department of Food Biotechnology. Institute of Agrochemistry and Food Technology (IATA), CSIC, Valencia, Spain.
3Department of Genetics, University of Valencia, Valencia, Spain.
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Abstract

Horizontal Gene Transfer (HGT) in eukaryotic plastids and mitochondrial genomes is frequently observed, and plays an important role in organism evolution. In yeasts, recent mitochondrial HGT has been suggested between S. cerevisiae and S. paradoxus. However, few strains have been explored due to the lack of accurate mitochondrial genome annotations. Mitochondrial genome sequences are important to understand how frequent these introgressions occur and their role in cytonuclear incompatibilities. In fact, most of the Bateson-Dobzhansky-Muller genetic incompatibilities described in yeasts are driven by these cytonuclear incompatibilities. In this study, we have explored the mitochondrial inheritance of several worldwide distributed Saccharomyces species isolated from different sources and geographic origins. We demonstrated the existence of recombination hotspots in the mitochondrial region COX2-ORF1, likely mediated by the transfer of two different types of ORF1, encoding a free-standing homing endonuclease, or facilitated by AT tandem repeats and GC clusters. These introgressions were shown to occur both at intra- and interspecific levels. Based on our results we proposed a model which involve several ancestral hybridization events among Saccharomyces strains in wild environments.

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Posted October 04, 2015.
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Mitochondrial introgression suggests extensive ancestral hybridization events among Saccharomyces species
David Peris, Armando Arias, Sandi Orlić, Carmela Belloch, Laura Pérez-Través, Amparo Querol, Eladio Barrio
bioRxiv 028324; doi: https://doi.org/10.1101/028324
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Mitochondrial introgression suggests extensive ancestral hybridization events among Saccharomyces species
David Peris, Armando Arias, Sandi Orlić, Carmela Belloch, Laura Pérez-Través, Amparo Querol, Eladio Barrio
bioRxiv 028324; doi: https://doi.org/10.1101/028324

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