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

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State: Public
Version: Final published version
License: CC BY 4.0
Serval ID
serval:BIB_4EC401109BAD
Type
Article: article from journal or magazin.
Collection
Publications
Title
Genomic signatures accompanying the dietary shift to phytophagy in polyphagan beetles.
Journal
Genome biology
Author(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
Publication state
Published
Issued date
17/05/2019
Peer-reviewed
Oui
Volume
20
Number
1
Pages
98
Language
english
Notes
Publication types: Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
Publication Status: epublish
Abstract
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.
Keywords
Adaptation, Biological, Animals, Biological Evolution, Coleoptera/enzymology, Coleoptera/genetics, Genomics, Herbivory, Models, Genetic, Multigene Family, Beetle diversification, Beetle-plant trophic interactions, Detoxification enzymes, Gene family evolution
Pubmed
Web of science
Open Access
Yes
Funding(s)
Swiss National Science Foundation / Careers / PP00P3_170664
Create date
19/05/2019 17:30
Last modification date
20/08/2019 15:04
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