Genomic signatures accompanying the dietary shift to phytophagy in polyphagan beetles.

Détails

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Etat: Serval
Version: Final published version
Licence: CC BY 4.0
ID Serval
serval:BIB_4EC401109BAD
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Genomic signatures accompanying the dietary shift to phytophagy in polyphagan beetles.
Périodique
Genome Biology
Auteur(s)
Seppey M., Ioannidis P., Emerson B.C., Pitteloud C., Robinson-Rechavi M., Roux J., Escalona H.E., McKenna D.D., Misof B., Shin S., Zhou X., Waterhouse R.M., Alvarez N.
ISSN
1474-760X (Electronic)
ISSN-L
1474-7596
Statut éditorial
Publié
Date de publication
17/05/2019
Peer-reviewed
Oui
Volume
20
Numéro
1
Pages
98
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: epublish
Résumé
The diversity and evolutionary success of beetles (Coleoptera) are proposed to be related to the diversity of plants on which they feed. Indeed, the largest beetle suborder, Polyphaga, mostly includes plant eaters among its approximately 315,000 species. In particular, plants defend themselves with a diversity of specialized toxic chemicals. These may impose selective pressures that drive genomic diversification and speciation in phytophagous beetles. However, evidence of changes in beetle gene repertoires driven by such interactions remains largely anecdotal and without explicit hypothesis testing.
We explore the genomic consequences of beetle-plant trophic interactions by performing comparative gene family analyses across 18 species representative of the two most species-rich beetle suborders. We contrast the gene contents of species from the mostly plant-eating suborder Polyphaga with those of the mainly predatory Adephaga. We find gene repertoire evolution to be more dynamic, with significantly more adaptive lineage-specific expansions, in the more speciose Polyphaga. Testing the specific hypothesis of adaptation to plant feeding, we identify families of enzymes putatively involved in beetle-plant interactions that underwent adaptive expansions in Polyphaga. There is notable support for the selection hypothesis on large gene families for glutathione S-transferase and carboxylesterase detoxification enzymes.
Our explicit modeling of the evolution of gene repertoires across 18 species identifies putative adaptive lineage-specific gene family expansions that accompany the dietary shift towards plants in beetles. These genomic signatures support the popular hypothesis of a key role for interactions with plant chemical defenses, and for plant feeding in general, in driving beetle diversification.
Mots-clé
Beetle diversification, Beetle-plant trophic interactions, Detoxification enzymes, Gene family evolution
Pubmed
Web of science
Open Access
Oui
Financement(s)
Fonds national suisse / Carrières / PP00P3_170664
Création de la notice
19/05/2019 17:30
Dernière modification de la notice
07/06/2019 7:08
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