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- Philipp Brand
- Department of Evolution and Ecology, Center for Population Biology, University of California, Davis, Davis, United States
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- Hugh M Robertson
- Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, United States
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- Wei Lin
- Department of Entomology and Nematology, University of California, Davis, Davis, United States
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- Ratnasri Pothula
- Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, United States
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- William E Klingeman
- Department of Plant Sciences, University of Tennessee, Knoxville, United States
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- Juan Luis Jurat-Fuentes
- Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, United States
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- Brian R Johnson
- Department of Entomology and Nematology, University of California, Davis, Davis, United States
抄録
<jats:p>The origin of the insect odorant receptor (OR) gene family has been hypothesized to have coincided with the evolution of terrestriality in insects. Missbach et al. (2014) suggested that ORs instead evolved with an ancestral OR co-receptor (Orco) after the origin of terrestriality and the OR/Orco system is an adaptation to winged flight in insects. We investigated genomes of the Collembola, Diplura, Archaeognatha, Zygentoma, Odonata, and Ephemeroptera, and find ORs present in all insect genomes but absent from lineages predating the evolution of insects. Orco is absent only in the ancestrally wingless insect lineage Archaeognatha. Our new genome sequence of the zygentoman firebrat Thermobia domestica reveals a full OR/Orco system. We conclude that ORs evolved before winged flight, perhaps as an adaptation to terrestriality, representing a key evolutionary novelty in the ancestor of all insects, and hence a molecular synapomorphy for the Class Insecta.</jats:p>
収録刊行物
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- eLife
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eLife 7 e38340-, 2018-07-31
eLife Sciences Publications, Ltd