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Fine-scale Population Structure of North American Arabidopsis thaliana Reveals Multiple Sources of Introduction from Across Eurasia

View ORCID ProfileGautam Shirsekar, Jane Devos, View ORCID ProfileSergio M. Latorre, Andreas Blaha, Maique Queiroz Dias, View ORCID ProfileAlba González Hernando, Derek S. Lundberg, View ORCID ProfileHernán A. Burbano, View ORCID ProfileCharles B. Fenster, View ORCID ProfileDetlef Weigel
doi: https://doi.org/10.1101/2021.01.22.427575
Gautam Shirsekar
1Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany
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Jane Devos
1Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany
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Sergio M. Latorre
1Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany
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Andreas Blaha
1Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany
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Maique Queiroz Dias
1Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany
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Alba González Hernando
1Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany
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  • ORCID record for Alba González Hernando
Derek S. Lundberg
1Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany
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Hernán A. Burbano
1Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany
2Centre for Life’s Origin and Evolution, University College London, London WC1E 6BT, UK
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Charles B. Fenster
3South Dakota State University, Brookings, SD 57007, USA
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Detlef Weigel
1Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany
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  • For correspondence: weigel@weigelworld.org
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Abstract

Large-scale movement of organisms across their habitable range, or migration, is an important evolutionary process that can contribute to observed patterns of genetic diversity and our understanding of the adaptive spread of alleles. While human migrations have been studied in great detail with modern and ancient genomes, recent anthropogenic influence on reducing the biogeographical constraints on the migration of non-native species has presented opportunities in several study systems to ask the questions about how repeated introductions shape genetic diversity in the introduced range. We present here the most comprehensive view of population structure of North American Arabidopsis thaliana by studying a set of 500 (whole-genome sequenced) and over 2800 (RAD-seq genotyped) individuals in the context of global diversity represented by Afro-Eurasian genomes. We use haplotype-sharing, phylogenetic modeling and rare-allele sharing based methods to identify putative sources of introductions of extant N. American A. thaliana from the native range of Afro-Eurasia. We find evidence of admixture among the introduced lineages that has resulted in the increased haplotype diversity and reduced mutational load. Further, we also present signals of selection in the immune-system related genes that impart qualitative disease resistance to pathogens of bacterial and oomycete origins. Thus, multiple introductions to a non-native range can quickly increase adaptive potential of a colonizing species by increasing haplotypic diversity through admixture. The results presented here lay the foundation for further investigations into the functional significance of admixture.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • https://nextcloud.tuebingen.mpg.de/index.php/s/Qy8PEL4Pkd6kibs

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted January 22, 2021.
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Fine-scale Population Structure of North American Arabidopsis thaliana Reveals Multiple Sources of Introduction from Across Eurasia
Gautam Shirsekar, Jane Devos, Sergio M. Latorre, Andreas Blaha, Maique Queiroz Dias, Alba González Hernando, Derek S. Lundberg, Hernán A. Burbano, Charles B. Fenster, Detlef Weigel
bioRxiv 2021.01.22.427575; doi: https://doi.org/10.1101/2021.01.22.427575
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Fine-scale Population Structure of North American Arabidopsis thaliana Reveals Multiple Sources of Introduction from Across Eurasia
Gautam Shirsekar, Jane Devos, Sergio M. Latorre, Andreas Blaha, Maique Queiroz Dias, Alba González Hernando, Derek S. Lundberg, Hernán A. Burbano, Charles B. Fenster, Detlef Weigel
bioRxiv 2021.01.22.427575; doi: https://doi.org/10.1101/2021.01.22.427575

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