Genetic assimilation of ancestral plasticity during parallel adaptation to zinc contamination in Silene uniflora.

Autor: Wood DP; Molecular Ecology and Evolution Bangor, School of Natural Sciences, Bangor University, Environment Centre Wales, Bangor, UK., Holmberg JA; Molecular Ecology and Evolution Bangor, School of Natural Sciences, Bangor University, Environment Centre Wales, Bangor, UK., Osborne OG; Molecular Ecology and Evolution Bangor, School of Natural Sciences, Bangor University, Environment Centre Wales, Bangor, UK., Helmstetter AJ; Fondation pour la Recherche sur la Biodiversité - Centre for the Synthesis and Analysis of Biodiversity, Institut Bouisson Bertrand, Montpellier, France., Dunning LT; Ecology and Evolutionary Biology, School of Biosciences, Sheffield, UK., Ellison AR; Molecular Ecology and Evolution Bangor, School of Natural Sciences, Bangor University, Environment Centre Wales, Bangor, UK., Smith RJ; Royal Botanic Gardens, Kew, Richmond, UK., Lighten J; College of Life and Environmental Sciences, University of Exeter, Exeter, UK., Papadopulos AST; Molecular Ecology and Evolution Bangor, School of Natural Sciences, Bangor University, Environment Centre Wales, Bangor, UK. a.papadopulos@bangor.ac.uk.
Jazyk: angličtina
Zdroj: Nature ecology & evolution [Nat Ecol Evol] 2023 Mar; Vol. 7 (3), pp. 414-423. Date of Electronic Publication: 2023 Jan 26.
DOI: 10.1038/s41559-022-01975-w
Abstrakt: Phenotypic plasticity in ancestral populations is hypothesized to facilitate adaptation, but evidence is piecemeal and often contradictory. Further, whether ancestral plasticity increases the probability of parallel adaptive changes has not been explored. The most general finding is that ancestral responses to a new environment are reversed following adaptation (known as reversion). We investigated the contribution of ancestral plasticity to adaptive evolution of gene expression in two independently evolved lineages of zinc-tolerant Silene uniflora. We found that the general pattern of reversion is driven by the absence of a widespread stress response in zinc-adapted plants compared with zinc-sensitive plants. We show that ancestral plasticity that moves expression closer to the optimum value in the new environment influences the evolution of gene expression among genes that are likely to be involved in adaptation and increases the chance that genes are recruited repeatedly during adaptation. However, despite convergence in gene expression levels between independently adapted lineages, ancestral plasticity does not influence how similar expression values of adaptive genes become. Surprisingly, we also observed that ancestral plasticity that increases fitness often becomes genetically determined and fixed, that is, genetically assimilated. These results emphasize the important role of ancestral plasticity in parallel adaptation.
(© 2023. The Author(s).)
Databáze: MEDLINE
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