Sex-specific non-pheromonal taste receptors in Drosophila
Sex-specific non-pheromonal taste receptors in Drosophila
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DOI：
10.1016/s0960-9822(00)00860-5
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发表时间：
2000-12-14
期刊：
影响因子：
9.2
通讯作者：
Marion-Poll, F
中科院分区：
文献类型：
--
作者：
Meunier, N;Ferveur, JF;Marion-Poll, F
最近有报道称果蝇体内存在味觉受体[1,2]，但对于受体与反应之间的关系却知之甚少。对化学感觉刚毛分布的形态学研究表明，果蝇有两个主要的味觉部位：喙和腿[3]。这两个部位的味觉刚毛在结构上相似，并且每个刚毛通常容纳四个味觉神经元[4]。早期的解剖学观察已经证明跗节刚毛的数量[5]及其向中枢的投射[6]存在性别二态性。我们测量了前胸味觉刚毛对非信息素物质——盐、糖和水的电生理反应，发现了明显的性别二态性。从单个刚毛的反应图谱中，我们能够区分出雌性有三种跗节刚毛类型，而雄性只有两种。对糖有特异性反应的雌性特异性类型在雄性中不存在，除非雄性味觉神经元经过基因女性化处理。跗节味觉毛表现出性别二态性且影响对非信息素化合物的感知这一事实表明，性别特性比之前所认为的更为复杂[7,8]。
Taste receptors have recently been reported in Drosophila [1,2], but little is known of the relation between receptor and response. Morphological studies of the distribution of chemosensory sensilla indicate that the fruit fly has two major sites of gustation: the proboscis and the legs [3], The taste sensilla on both these sites are similar in structure and each sensillum generally houses four gustatory neurons [4]. Early anatomical observations have demonstrated a sexual dimorphism in the number of tarsal sensilla [5] and in their central projections [6], We measured the electrophysiological responses of the prothoracic taste sensilla to non-pheromonal substances - salts, sugars and water - and found a clear sexual dimorphism, From the response profile of individual sensilla, we were able to distinguish three types of tarsal sensilla in females as against only two types in males. The female specific type, which responded specifically to sugar, was absent in males except when male gustatory neurons were genetically feminised, The fact that tarsal gustatory hairs exhibit a sexual dimorphism that affects the perception of non-pheromonal compounds suggests that sexual identity is more complex than has previously been thought [7,8].