Abstract:
:The balance between excitatory and inhibitory (E and I) synapses is thought to be critical for information processing in neural circuits. However, little is known about the spatial principles of E and I synaptic organization across the entire dendritic tree of mammalian neurons. We developed a new open-source reconstruction platform for mapping the size and spatial distribution of E and I synapses received by individual genetically-labeled layer 2/3 (L2/3) cortical pyramidal neurons (PNs) in vivo. We mapped over 90,000 E and I synapses across twelve L2/3 PNs and uncovered structured organization of E and I synapses across dendritic domains as well as within individual dendritic segments. Despite significant domain-specific variation in the absolute density of E and I synapses, their ratio is strikingly balanced locally across dendritic segments. Computational modeling indicates that this spatially precise E/I balance dampens dendritic voltage fluctuations and strongly impacts neuronal firing output.
journal_name
Neuronjournal_title
Neuronauthors
Iascone DM,Li Y,Sümbül U,Doron M,Chen H,Andreu V,Goudy F,Blockus H,Abbott LF,Segev I,Peng H,Polleux Fdoi
10.1016/j.neuron.2020.02.015subject
Has Abstractpub_date
2020-05-20 00:00:00pages
566-578.e8issue
4eissn
0896-6273issn
1097-4199pii
S0896-6273(20)30138-0journal_volume
106pub_type
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