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首页> 外文期刊>Journal of biology >A Drosophila female pheromone elicits species-specific long-range attraction via an olfactory channel with dual specificity for sex and food
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A Drosophila female pheromone elicits species-specific long-range attraction via an olfactory channel with dual specificity for sex and food

机译:果蝇雌性信息素通过对性和食物具有双重特异性的嗅觉通道引起物种特异性的远距离吸引

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摘要

Background Mate finding and recognition in animals evolves during niche adaptation and involves social signals and habitat cues. Drosophila melanogaster and related species are known to be attracted to fermenting fruit for feeding and egg-laying, which poses the question of whether species-specific fly odours contribute to long-range premating communication. Results We have discovered an olfactory channel in D. melanogaster with a dual affinity to sex and food odorants. Female flies release a pheromone, ( Z )-4-undecenal ( Z 4-11Al), that elicits flight attraction in both sexes. Its biosynthetic precursor is the cuticular hydrocarbon ( Z,Z )-7,11-heptacosadiene (7,11-HD), which is known to afford reproductive isolation between the sibling species D. melanogaster and D. simulans during courtship. Twin olfactory receptors, Or69aB and Or69aA, are tuned to Z 4-11Al and food odorants, respectively. They are co-expressed in the same olfactory sensory neurons, and feed into a neural circuit mediating species-specific, long-range communication; however, the close relative D. simulans , which shares food resources with D. melanogaster , does not respond to Z 4-11Al. Conclusion The Or69aA and Or69aB isoforms have adopted dual olfactory traits. The underlying gene yields a collaboration between natural and sexual selection, which has the potential to drive speciation.
机译:背景技术在动物中寻找和识别伴侣的过程在生态位适应过程中不断发展,并涉及社会信号和栖息地线索。果蝇(Drosophila melanogaster)和相关物种被吸引到发酵水果中进行取食和产卵,这提出了一个问题,即特定物种的苍蝇气味是否有助于长距离的早交。结果我们在黑腹果蝇中发现了一个嗅觉通道,对性和食物气味具有双重亲和力。雌蝇释放出一种信息素(Z)-4-十一碳烯(Z 4-11A1),从而引起两性的飞行吸引力。它的生物合成前体是表皮碳氢化合物(Z,Z)-7,11-庚二烯(7,11-HD),已知它在求偶过程中可为兄弟种D. melanogaster和D. simulans提供生殖隔离。双嗅觉受体Or69aB和Or69aA分别调整为Z 4-11A1和食物气味剂。它们在同一嗅觉感觉神经元中共表达,并馈入介导物种特异性,远距离交流的神经回路中。然而,与黑腹果蝇共享食物资源的近亲近缘象鼻虫对Z 4-11A1没有反应。结论Or69aA和Or69aB亚型具有双重嗅觉特征。潜在的基因在自然选择和性选择之间产生了协作,这有可能推动物种形成。

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