The Organization of Projections from Olfactory Glomeruli onto Higher-Order Neurons.

The Organization of Projections from Olfactory Glomeruli onto Higher-Order Neurons.
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DOI:
10.1016/j.neuron.2018.05.011
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发表时间:
2018-06-27
期刊:
影响因子:
16.2
通讯作者:
Wilson RI
Wilson RI
中科院分区:
医学1区
文献类型:
--
作者:
Jeanne JM;Fişek M;Wilson RI

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每个气味受体对应于大脑中一个独特的肾小球。然后,来自不同肾小球的投影会在较高的脑区汇合,但我们不了解哪些肾小球会汇合,哪些不会。在这里,我们使用双光子光遗传学将肾小球连接映射到外侧角的神经元上,外侧角是果蝇大脑中接收大部分嗅觉投射的区域。我们鉴定了39种形态类型的侧角神经元(LHNs),并表明不同类型的神经元接受来自不同肾小球组合的输入。我们发现不同的LHN类型没有独立的输入;相反,肾小球的某些组合汇聚到许多相同的lhn上,因此被过度代表。值得注意的是,许多过度代表的组合是由肾小球组成的,肾小球更喜欢化学上不同的配体,这些配体的共同出现表明了与行为相关的“气味场景”。因此,肾小球- lhn连接的模式代表了哪种配体组合最显著的预测。Jeanne等人利用双光子光遗传学绘制了果蝇嗅肾小球与侧角神经元之间的连接图谱。肾小球的某些组合被过度代表。这些不是相似的肾小球;相反,它们是肾小球,其共同激活信号是一个显著的“气味场景”。
Each odorant receptor corresponds to a unique glomerulus in the brain. Projections from different glomeruli then converge in higher brain regions, but we do not understand the logic governing which glomeruli converge and which do not. Here we use two-photon optogenetics to map glomerular connections onto neurons in the lateral horn, the region of the Drosophila brain which receives the majority of olfactory projections. We identify 39 morphological types of lateral horn neurons (LHNs) and show that different types receive input from different combinations of glomeruli. We find that different LHN types do not have independent inputs; rather, certain combinations of glomeruli converge onto many of the same LHNs and so are overrepresented. Notably, many overrepresented combinations are composed of glomeruli that prefer chemically-dissimilar ligands whose co-occurrence indicates a behaviorally-relevant “odor scene”. The pattern of glomerulus-LHN connections thus represents a prediction of what ligand combinations will be most salient. Jeanne et al. use two-photon optogenetics to map connections from olfactory glomeruli onto lateral horn neurons in Drosophila. Certain combinations of glomeruli are overrepresented. These are not similarly-tuned glomeruli; rather, they are glomeruli whose co-activation signals a salient “odor scene”.
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