Novelty and Convergence in Adaptation to Whole Genome Duplication
| Autor: | Patrick J. Monnahan, Sian Bray, Filip Kolář, Magdalena Bohutínská, Mark Alston, Terezie Mandáková, Pirita Paajanen, Levi Yant |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Population Arabidopsis adaptation Biology AcademicSubjects/SCI01180 01 natural sciences Arabidopsis arenosa Polyploidy 03 medical and health sciences Cardamine amara Polyploid Meiosis Chromosome Segregation Gene Duplication genome duplication Genetics education Molecular Biology Discoveries Ecology Evolution Behavior and Systematics 030304 developmental biology 0303 health sciences education.field_of_study convergence AcademicSubjects/SCI01130 biology.organism_classification Ion homeostasis Evolutionary biology Ploidy Adaptation Genome Plant 010606 plant biology & botany |
| Zdroj: | Molecular Biology and Evolution |
| ISSN: | 1537-1719 0737-4038 |
| DOI: | 10.1093/molbev/msab096 |
| Popis: | Whole genome duplication (WGD) can promote adaptation but is disruptive to conserved processes, especially meiosis. Studies in Arabidopsis arenosa revealed a coordinated evolutionary response to WGD involving interacting proteins controlling meiotic crossovers, which are minimized in an autotetraploid (within-species polyploid) to avoid missegregation. Here, we test whether this surprising flexibility of a conserved essential process, meiosis, is recapitulated in an independent WGD system, Cardamine amara, 17 My diverged from A. arenosa. We assess meiotic stability and perform population-based scans for positive selection, contrasting the genomic response to WGD in C. amara with that of A. arenosa. We found in C. amara the strongest selection signals at genes with predicted functions thought important to adaptation to WGD: meiosis, chromosome remodeling, cell cycle, and ion transport. However, genomic responses to WGD in the two species differ: minimal ortholog-level convergence emerged, with none of the meiosis genes found in A. arenosa exhibiting strong signal in C. amara. This is consistent with our observations of lower meiotic stability and occasional clonal spreading in diploid C. amara, suggesting that nascent C. amara autotetraploid lineages were preadapted by their diploid lifestyle to survive while enduring reduced meiotic fidelity. However, in contrast to a lack of ortholog convergence, we see process-level and network convergence in DNA management, chromosome organization, stress signaling, and ion homeostasis processes. This gives the first insight into the salient adaptations required to meet the challenges of a WGD state and shows that autopolyploids can utilize multiple evolutionary trajectories to adapt to WGD. |
| Databáze: | OpenAIRE |
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