Transsynaptic Mapping of Second-Order Taste Neurons in Flies by trans-Tango.

Transsynaptic Mapping of Second-Order Taste Neurons in Flies by trans-Tango.
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DOI:
10.1016/j.neuron.2017.10.011
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发表时间:
2017-11-15
期刊:
影响因子:
16.2
通讯作者:
Barnea G
Barnea G
中科院分区:
医学1区
文献类型:
--
作者:
Talay M;Richman EB;Snell NJ;Hartmann GG;Fisher JD;Sorkaç A;Santoyo JF;Chou-Freed C;Nair N;Johnson M;Szymanski JR;Barnea G

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通过定义的突触映射神经回路对于理解大脑功能至关重要。在这里,我们描述trans-Tango,顺行跨突触电路跟踪和操纵的技术。trans-Tango的核心是一种合成信号通路,被引入动物的所有神经元。该途径通过位点特异性蛋白水解将细胞表面的受体活化转化为报告基因表达。特异性标记是通过在遗传定义的神经元的突触处呈递拴系配体来实现的,从而激活其突触后伴侣中的通路并提供对这些神经元的遗传访问。我们首先在果蝇嗅觉系统中验证了trans-Tango,然后在味觉系统中实现了它,其中超出一阶受体神经元的预测尚未完全表征。我们确定了甜味回路中的假定二级神经元,包括针对大脑中已知神经调节中心的投射神经元。这些实验建立trans-Tango作为跨突触电路分析的灵活平台。
Mapping neural circuits across defined synapses is essential for understanding brain function. Here we describe trans-Tango, a technique for anterograde transsynaptic circuit tracing and manipulation. At the core of trans-Tango is a synthetic signaling pathway that is introduced into all neurons in the animal. This pathway converts receptor activation at the cell-surface into reporter expression through site-specific proteolysis. Specific labeling is achieved by presenting a tethered ligand at the synapses of genetically defined neurons, thereby activating the pathway in their postsynaptic partners and providing genetic access to these neurons. We first validated trans-Tango in the Drosophila olfactory system and then implemented it in the gustatory system, where projections beyond the first-order receptor neurons are not fully characterized. We identified putative second-order neurons within the sweet circuit that include projection neurons targeting known neuromodulation centers in the brain. These experiments establish trans-Tango as a flexible platform for transsynaptic circuit analysis.
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