Delicious poison: genetics of Drosophila host plant preference |
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Authors: | Whiteman Noah K Pierce Naomi E |
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Affiliation: | Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA. |
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Abstract: | Insects use chemical cues to identify host plants, which suggests that chemosensory perception could be a target of natural selection during host specialization. Five papers using data from the 12 recently sequenced Drosophila genomes examined chemosensory gene function and evolution across specialist and generalist species. A functional study identifies odorant binding proteins that mediate loss of toxin avoidance in a specialist, and targeted genomic studies indicate specialists and island endemics lose chemosensory genes more rapidly than generalist and mainland relatives. Together, these studies suggest a mode of chemoreceptor evolution dominated by birth/death dynamics, coupled with a low level of potential positive selection. |
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