Plastome Structural Evolution and Homoplastic Inversions in Neo-Astragalus (Fabaceae)
Affiliation
Department of Ecology and Evolutionary Biology, University of ArizonaIssue Date
2021Keywords
chloroplastinverted repeat-lacking clade
legumes
microhomology-mediated rearrangements
plastid genome
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OXFORD UNIV PRESS INCCitation
Charboneau, J. L. M., Cronn, R. C., Liston, A., Wojciechowski, M. F., & Sanderson, M. J. (2021). Plastome Structural Evolution and Homoplastic Inversions in Neo-Astragalus (Fabaceae). Genome Biology and Evolution.Journal
Genome biology and evolutionRights
Copyright © The Author(s) 2021. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/).Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
The plastid genomes of photosynthetic green plants have largely maintained conserved gene content and order as well as structure over hundreds of millions of years of evolution. Several plant lineages, however, have departed from this conservation and contain many plastome structural rearrangements, which have been associated with an abundance of repeated sequences both overall and near rearrangement endpoints. We sequenced the plastomes of 25 taxa of Astragalus L. (Fabaceae), a large genus in the inverted repeat-lacking clade of legumes, to gain a greater understanding of the connection between repeats and plastome inversions. We found plastome repeat structure has a strong phylogenetic signal among these closely related taxa mostly in the New World clade of Astragalus called Neo-Astragalus. Taxa without inversions also do not differ substantially in their overall repeat structure from four taxa each with one large-scale inversion. For two taxa with inversion endpoints between the same pairs of genes, differences in their exact endpoints indicate the inversions occurred independently. Our proposed mechanism for inversion formation suggests the short inverted repeats now found near the endpoints of the four inversions may be there as a result of these inversions rather than their cause. The longer inverted repeats now near endpoints may have allowed the inversions first mediated by shorter microhomologous sequences to propagate, something that should be considered in explaining how any plastome rearrangement becomes fixed regardless of the mechanism of initial formation. © The Author(s) 2021. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.Note
Open access journalISSN
1759-6653PubMed ID
34534296Version
Final published versionae974a485f413a2113503eed53cd6c53
10.1093/gbe/evab215
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Except where otherwise noted, this item's license is described as Copyright © The Author(s) 2021. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/).
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