微RNA突变体中的混合神经元是昆虫CO2传感系统中的假定进化中间体
Pelin Cayirlioglu1, Ilona Grunwald Kadow, Xiaoli Zhan
1Department of Biological Chemistry, Howard Hughes Medical Institute, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA.
概括
德洛索菲拉的microRNAmiR-279的损失导致二氧化碳 (CO2) 感应神经元在上手掌 (MPs) 中形成. 这些子宫外神经元表现出混合特征,提供了对二氧化碳驱动行为的演变的见解.
科学领域:
- 神经科学是一个神经科学.
- 进化生物学 进化生物学
- 遗传学 是一个遗传学.
背景情况:
- 二氧化碳 (CO2) 检测驱动物种间不同的嗅觉行为.
- 在Drosophila中,CO2神经元是天线性,投射到腹腔天线叶以避免.
- 在蚊子中,二氧化碳神经元位于上手掌 (MPs),向中部投射吸引力.
研究的目的:
- 为了研究物种特异性二氧化碳感应神经元放置背后的分子机制.
- 探索微RNAmiR-279在确定二氧化碳神经元位置和功能中的作用.
- 为了表征外宫CO2感应神经元,形成于大巴掌中.
主要方法:
- 在Drosophila中进行基因操纵以研究microRNA功能.
- 使用神经解剖学技术分析神经元位置和连接.
- 在异胎神经元中对基因表达和受体特征的分子分析.
主要成果:
- 德洛索菲拉中miR-279的丢失导致了大巴 (MPs) 内的二氧化碳感应神经元的形成.
- 这些宫外MP神经元表达了CO2受体,并形成了特有的CO2神经元连接.
- 混合神经元显示了MP嗅觉受体神经元 (ORN) 和CO2神经元的布线和受体特性.
结论:
- miR-279调节了Drosophila中CO2感应神经元的适当定位.
- 德洛索菲拉MPs中的异胎CO2神经元代表一种混合细胞类型.
- 这一发现为了解二氧化碳引起的行为演变提供了一个细胞中间模型.
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