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标题：Classifying Drosophila olfactory projection neuron boutons by quantitative analysis of electron microscopic reconstruction
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作者：Kai Yang ; Tong Liu ; Ze Wang 等
期刊名称：iScience
印刷版ISSN：2589-0042
出版年度：2022
卷号：25
期号：5
页码：1-15
DOI：10.1016/j.isci.2022.104180
语种：English
出版社：Elsevier
摘要：SummaryInDrosophila melanogaster, olfactory projection neurons (PNs) convey odor information from the antenna lobe to higher brain regions. Recent transcriptomic studies reveal a large diversity of transcription factors, cell-surface molecules, neurotransmitter-coding, and neuropeptide-coding genes in PNs; however, their structural diversity remains unknown. Herein, we achieved a volumetric reconstruction of 89 PN boutons under Focused Ion Beam Scanning Electron Microscopy (FIB-SEM) and quantitatively analyzed the internal presynaptic active zones (PAZs) and dense-core vesicles (DCVs). The ultrastructure-based cluster analysis reveals three morphological distinct bouton subtypes: complex boutons, unilobed boutons, and simple boutons. The complex boutons contain the most PAZs and DCVs, which suggests that they are of the highest capability of releasing neurotransmitters and neuromodulators. By labeling a subset of boutons under FIB-SEM, we found that DCVs are preferentially distributed in certain GH146-positive subtypes. Our study demonstrates that PN boutons display distinct morphology, which may determine their capacity of releasing neurotransmitters and neuromodulators.Graphical abstractDisplay OmittedHighlights•Volumetric reconstruction categorizes neurons based on subcellular characteristics•Complex boutons contain the most presynaptic active zones and dense core vesicles•The quantity of presynaptic active zone is linearly related to the bouton size•Dense core vesicles are preferentially distributed in GH146-positive PN boutonsNeuroscience; Sensory neuroscience; Cell biology