La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	How Complexity Originates: The Evolution of Animal Eyes (2015)
Auteurs :	Todd H. Oakley, Auteur ; Daniel I. Speiser, Auteur ; D. J. Futuyma, Auteur
Type de document :	Article
Dans :	Annual Review of Ecology, Evolution, and Systematics (46 2015)
Article en page(s) :	237-260
Langues:	Anglais
Résumé :	Learning how complex traits like eves originate is fundamental for understanding evolution. In this review, we first sketch historical perspectives on trait origins and argue that new technologies afford key new insights. Next, we articulate four open questions about trait origins. To address them, we define a research program to break complex traits into component parts and to study the individual evolutionary histories of those parts. By doing so, we can learn when the parts came together and perhaps understand why they staved together. We apply this approach to five structural innovations critical for complex eyes and review the history of the parts of each of those innovations. eyes evolved within animals by tinkering: creating new functional associations between genes that usually originated far earlier. Multiple genes used in eyes today had ancestral roles in stress responses. We hypothesize that photo-oxidative stress had a role in eye origins by increasing; the chance that those genes were expressed together in places on animals where light was abundant.

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