Variation in linked selection and recombination drive genomic divergence during allopatric speciation of European and American aspens
Despite the global economic and ecological importance of forest trees, the genomic basis of differential adaptation and speciation in tree species is still poorly understood. Populus tremula and P. tremuloides are two of the most widespread tree species in the Northern Hemisphere. Using whole-genome...
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Umeå universitet, Institutionen för ekologi, miljö och geovetenskap
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-118326 https://doi.org/10.1093/molbev/msw051 |
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ftumeauniv:oai:DiVA.org:umu-118326 2023-10-09T21:50:18+02:00 Variation in linked selection and recombination drive genomic divergence during allopatric speciation of European and American aspens Wang, Jing Street, Nathaniel Scofield, Douglas Ingvarsson, Pär 2016 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-118326 https://doi.org/10.1093/molbev/msw051 eng eng Umeå universitet, Institutionen för ekologi, miljö och geovetenskap Umeå universitet, Institutionen för fysiologisk botanik Department of Ecology and Genetics: Evolutionary Biology, Uppsala University, Uppsala, Sweden; Uppsala Multidisciplinary Center for Advanced Computational Science, Uppsala University, Uppsala, Sweden Molecular biology and evolution, 0737-4038, 2016, 33:7, s. 1754-1767 orcid:0000-0002-3793-3264 orcid:0000-0001-6031-005X orcid:0000-0001-9225-7521 http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-118326 doi:10.1093/molbev/msw051 ISI:000378767100009 Scopus 2-s2.0-84987988417 info:eu-repo/semantics/openAccess Populus tremula P. tremuloides whole-genome re-sequencing demographic histories heterogeneous genomic differentiation linked selection recombination Evolutionary Biology Evolutionsbiologi Article in journal info:eu-repo/semantics/article text 2016 ftumeauniv https://doi.org/10.1093/molbev/msw051 2023-09-22T13:59:28Z Despite the global economic and ecological importance of forest trees, the genomic basis of differential adaptation and speciation in tree species is still poorly understood. Populus tremula and P. tremuloides are two of the most widespread tree species in the Northern Hemisphere. Using whole-genome re-sequencing data of 24 P. tremula and 22 P. tremuloidesindividuals, we find that the two species diverged ~2.2-3.1 million years ago, coinciding with the severing of the Bering land bridge and the onset of dramatic climatic oscillations during the Pleistocene. Both species have experienced substantial population expansions following long-term declines after species divergence. We detect widespread and heterogeneous genomic differentiation between species, and in accordance with the expectation of allopatric speciation, coalescent simulations suggest that neutral evolutionary processes can account for most of the observed patterns of genetic differentiation. However, there is an excess of regions exhibiting extreme differentiation relative to those expected under demographic simulations, which is indicative of the action of natural selection. Overall genetic differentiation is negatively associated with recombination rate in both species, providing strong support for a role of linked selection in generating the heterogeneous genomic landscape of differentiation between species. Finally, we identify a number of candidate regions and genes that may have been subject to positive and/or balancing selection during the speciation process. Article in Journal/Newspaper Bering Land Bridge Umeå University: Publications (DiVA) Molecular Biology and Evolution 33 7 1754 1767 |
institution |
Open Polar |
collection |
Umeå University: Publications (DiVA) |
op_collection_id |
ftumeauniv |
language |
English |
topic |
Populus tremula P. tremuloides whole-genome re-sequencing demographic histories heterogeneous genomic differentiation linked selection recombination Evolutionary Biology Evolutionsbiologi |
spellingShingle |
Populus tremula P. tremuloides whole-genome re-sequencing demographic histories heterogeneous genomic differentiation linked selection recombination Evolutionary Biology Evolutionsbiologi Wang, Jing Street, Nathaniel Scofield, Douglas Ingvarsson, Pär Variation in linked selection and recombination drive genomic divergence during allopatric speciation of European and American aspens |
topic_facet |
Populus tremula P. tremuloides whole-genome re-sequencing demographic histories heterogeneous genomic differentiation linked selection recombination Evolutionary Biology Evolutionsbiologi |
description |
Despite the global economic and ecological importance of forest trees, the genomic basis of differential adaptation and speciation in tree species is still poorly understood. Populus tremula and P. tremuloides are two of the most widespread tree species in the Northern Hemisphere. Using whole-genome re-sequencing data of 24 P. tremula and 22 P. tremuloidesindividuals, we find that the two species diverged ~2.2-3.1 million years ago, coinciding with the severing of the Bering land bridge and the onset of dramatic climatic oscillations during the Pleistocene. Both species have experienced substantial population expansions following long-term declines after species divergence. We detect widespread and heterogeneous genomic differentiation between species, and in accordance with the expectation of allopatric speciation, coalescent simulations suggest that neutral evolutionary processes can account for most of the observed patterns of genetic differentiation. However, there is an excess of regions exhibiting extreme differentiation relative to those expected under demographic simulations, which is indicative of the action of natural selection. Overall genetic differentiation is negatively associated with recombination rate in both species, providing strong support for a role of linked selection in generating the heterogeneous genomic landscape of differentiation between species. Finally, we identify a number of candidate regions and genes that may have been subject to positive and/or balancing selection during the speciation process. |
format |
Article in Journal/Newspaper |
author |
Wang, Jing Street, Nathaniel Scofield, Douglas Ingvarsson, Pär |
author_facet |
Wang, Jing Street, Nathaniel Scofield, Douglas Ingvarsson, Pär |
author_sort |
Wang, Jing |
title |
Variation in linked selection and recombination drive genomic divergence during allopatric speciation of European and American aspens |
title_short |
Variation in linked selection and recombination drive genomic divergence during allopatric speciation of European and American aspens |
title_full |
Variation in linked selection and recombination drive genomic divergence during allopatric speciation of European and American aspens |
title_fullStr |
Variation in linked selection and recombination drive genomic divergence during allopatric speciation of European and American aspens |
title_full_unstemmed |
Variation in linked selection and recombination drive genomic divergence during allopatric speciation of European and American aspens |
title_sort |
variation in linked selection and recombination drive genomic divergence during allopatric speciation of european and american aspens |
publisher |
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap |
publishDate |
2016 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-118326 https://doi.org/10.1093/molbev/msw051 |
genre |
Bering Land Bridge |
genre_facet |
Bering Land Bridge |
op_relation |
Molecular biology and evolution, 0737-4038, 2016, 33:7, s. 1754-1767 orcid:0000-0002-3793-3264 orcid:0000-0001-6031-005X orcid:0000-0001-9225-7521 http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-118326 doi:10.1093/molbev/msw051 ISI:000378767100009 Scopus 2-s2.0-84987988417 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1093/molbev/msw051 |
container_title |
Molecular Biology and Evolution |
container_volume |
33 |
container_issue |
7 |
container_start_page |
1754 |
op_container_end_page |
1767 |
_version_ |
1779313354633904128 |