Conserved cis-regulatory elements of two odorant-binding protein genes, Obp57d and Obp57e, in Drosophila
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概要
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Insect odorant-binding proteins function in the sensing of odors, tastes, and pheromones. Genes encoding two odorant-binding proteins, Obp57d and Obp57e, were identified to be involved in the behavioral adaptation of Drosophila sechellia to its host plant. The two genes are expressed in cells associated with taste sensilla on the legs, and the expression pattern in the legs is conserved among closely related species. To identify the cis-regulatory elements necessary for the expression in the leg sensilla, the promoter sequences of Obp57d and Obp57e were compared among species. Two types of conserved sequence-motifs were found as candidate cis-regulatory elements. Functions of these conserved elements in the promoters of D. melanogaster Obp57d and Obp57e were examined by using a newly constructed vector that combines the advantages of φC31 integrase-based transformation and gypsy transposable-element-derived insulators. By GFP-reporter assay using the new vector, it was confirmed that these conserved elements are necessary for the expression in the legs, working synergistically with each other to affect the expression level. Single-nucleotide substitutions in these elements dramatically changed the promoter activity. These results provide insight into the molecular mechanism for evolution of adaptive behavior via modulation of OBP expression levels.
著者
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Matsuo Takashi
Department Of Applied Chemistry Graduate School Of Engineering Osaka University
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Aigaki Toshiro
Department of Biollogical Science, Graduate School of Science, Tokyo Metropolitan University
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Tomioka Sachiko
Department of Biological Sciences, Tokyo Metropolitan University
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- Conserved cis-regulatory elements of two odorant-binding protein genes, Obp57d and Obp57e, in Drosophila