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Title: Expression Divergence of Chemosensory Genes between Drosophila sechellia and Its Sibling Species and Its Implications for Host Shift
Authors: Meng Shin Shiao
Jia Ming Chang
Wen Lang Fan
Mei Yeh Jade Lu
Cedric Notredame
Shu Fang
Rumi Kondo
Wen Hsiung Li
Mahidol University
IGH Institut de Genetique Humaine
Chang Gung Memorial Hospital
Academia Sinica, Biodiversity Research Center
Centro de Regulacion Genomica
Ochanomizu University
University of Chicago
Keywords: Agricultural and Biological Sciences;Biochemistry, Genetics and Molecular Biology
Issue Date: 1-Oct-2015
Citation: Genome biology and evolution. Vol.7, No.10 (2015), 2843-2858
Abstract: © The Author(s) 2015. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. Drosophila sechellia relies exclusively on the fruits of Morinda citrifolia, which are toxic to most insects, including its sibling species Drosophila melanogaster and Drosophila simulans. Although several odorant binding protein (Obp) genes and olfactory receptor (Or) genes have been suggested to be associated with the D. sechellia host shift, a broad view of how chemosensory genes have contributed to this shift is still lacking. We therefore studied the transcriptomes of antennae, the main organ responsible for detecting food resource and oviposition, of D. sechellia and its two sibling species. We wanted to know whether gene expression, particularly chemosensory genes, has diverged between D. sechellia and its two sibling species. Using a very stringent definition of differential gene expression, we found a higher percentage of chemosensory genes differentially expressed in the D. sechellia lineage (7.8%) than in the D. simulans lineage (5.4%); for upregulated chemosensory genes, the percentages were 8.8% in D. sechellia and 5.2% in D. simulans. Interestingly, Obp50a exhibited the highest upregulation, an approximately 100-fold increase, and Or85c--previously reported to be a larva-specific gene--showed approximately 20-fold upregulation in D. sechellia. Furthermore, Ir84a (ionotropic receptor 84a), which has been proposed to be associated with male courtship behavior, was significantly upregulated in D. sechellia. We also found expression divergence in most of the chemosensory gene families between D. sechellia and the two sibling species. Our observations suggest that the host shift of D. sechellia was associated with the enrichment of differentially expressed, particularly upregulated, chemosensory genes.
ISSN: 17596653
Appears in Collections:Scopus 2011-2015

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