Adaptive molecular convergence is pervasive across deep time and largely decoupled from phenotypic convergence
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Le résumé fourni par la source
Reuse of homologous genes during the evolution of similar traits or ecological transitions is often taken as evidence that evolution is repeatable at the molecular level. To study gene reuse, biologists frequently select specific convergent phenotypes and search for signatures of natural selection in genomes associated with those phenotypes. However, the causes and frequency of genome-scale molecular convergence remain unresolved, especially over deep timescales. We use phylotranscriptomics and analyses of sequence evolution to show that adaptive molecular convergence-defined as excess convergence of nonsynonymous substitutions between homologs, consistent with positive selection-is widespread across Medusozoa. Molecular convergence declines slightly over time but persists among lineages separated by over 600 My, consistently exceeding null expectations based on random overlap. Moreover, lineages sharing repeatedly evolved phenotypes (eyes, medusa loss, and upright colonies) do not exhibit elevated molecular convergence relative to other comparisons. Instead, convergence occurs idiosyncratically among species pairs and is broadly concentrated in genes associated with environment-facing functions, including metabolism, immunity, and xenobiotic processing. Our results suggest that selection often drives similar protein substitutions in disparate lineages, but that the selective causes of molecular convergence reflect multifaceted, lineage-specific interactions between organisms and their environments.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Adaptive molecular convergence is pervasive across deep time and largely decoupled from phenotypic convergence
- Date Crossref
- 28/07/2026
- Éditeur
- National Academy of Sciences
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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University of Kansas Department of Ecology and Evolutionary Biology pays non établi dans la noticeUniversité ou école supérieure
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College for Creative Studies pays non établi dans la noticeUniversité ou école supérieure
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Texas A&M University at Galveston pays non établi dans la noticeUniversité ou école supérieure
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University of California Department of Ecology pays non établi dans la noticeUniversité ou école supérieure
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School of Biological Sciences pays non établi dans la noticeUniversité ou école supérieure
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College of Creative Studies pays non établi dans la noticeUniversité ou école supérieure
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Texas A&M University Galveston Department of Marine Biology pays non établi dans la noticeUniversité ou école supérieure
Department of Ecology and Evolutionary Biology — University of Kansas, College for Creative Studies et Texas A&M University at Galveston, avec 4 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.