The Drosophila IR20a clade of ionotropic receptors are candidate taste and pheromone receptors.

The Drosophila IR20a clade of ionotropic receptors are candidate taste and pheromone receptors.
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DOI:
10.1016/j.neuron.2014.07.012
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发表时间:
2014-08-20
期刊:
影响因子:
16.2
通讯作者:
Carlson, John R.
Carlson, John R.
中科院分区:
医学1区
文献类型:
--
作者:
Koh, Tong-Wey;He, Zhe;Gorur-Shandilya, Srinivas;Menuz, Karen;Larter, Nikki K.;Stewart, Shannon;Carlson, John R.

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昆虫用味觉来评估食物、宿主和配偶。果蝇有许多“孤儿”味觉神经元,它们不表达已知的味觉受体。嗜离子受体(IR)超家族以其在嗅觉中的作用而闻名,但实际上对约35个成员的进化支IR20a进化支一无所知。在这里,对这个分支的全面分析揭示了果蝇所有味觉器官的表达。一些成员在孤儿味觉神经元中表达,而其他成员则与苦味或糖感味觉受体(Gr)基因共表达。对密切相关的IR52c和IR52d基因的分析揭示了适应进化的特征,在雄性交配行为中的作用,以及雄性前腿神经元的两性二态表达,雄性前腿在求偶期间与雌性接触。这些神经元被同种雌性激活,并与性行为的神经回路接触。总之,这些结果极大地扩展了果蝇中候选味觉和信息素受体的范围。
Insects use taste to evaluate food, hosts, and mates. Drosophila has many “orphan” taste neurons that express no known taste receptors. The Ionotropic Receptor (IR) superfamily is best known for its role in olfaction, but virtually nothing is known about a clade of ~35 members, the IR20a clade. Here, a comprehensive analysis of this clade reveals expression in all taste organs of the fly. Some members are expressed in orphan taste neurons, whereas others are coexpressed with bitter- or sugar-sensing Gustatory receptor (Gr) genes. Analysis of the closely related IR52c and IR52d genes reveals signatures of adaptive evolution, roles in male mating behavior, and sexually dimorphic expression in neurons of the male foreleg, which contacts females during courtship. These neurons are activated by conspecific females and contact a neural circuit for sexual behavior. Together, these results greatly expand the repertoire of candidate taste and pheromone receptors in the fly.
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