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Extraction of Distinct Neuronal Cell Types from within a Genetically Continuous Population
Euiseok J Kim1, Zhuzhu Zhang2, Ling Huang3
1Systems Neurobiology Laboratories, The Salk Institute for Biological Studies, La Jolla, CA 92037, USA; Department of Molecular, Cell, and Developmental Biology, University of California, Santa Cruz, Santa Cruz, CA 95064, USA.
Neuron
|May 13, 2020
Summary
Cortico-cortical projection neurons (CCPNs) show distinct gene expression patterns based on their projection targets, even within a single transcriptomic cluster. This highlights the need for combined genetic and projection analysis to fully classify neuron types.
Area of Science:
- Neuroscience
- Molecular Biology
- Genomics
Background:
- Single-cell transcriptomics has identified numerous neocortical neuron clusters.
- Cortico-cortical projection neurons (CCPNs) form few transcriptomic clusters despite diverse projections, unlike inhibitory and subcortical projection neurons (SCPNs).
Purpose of the Study:
- To investigate the transcriptomic and projection-dependent differences in mouse primary visual cortex CCPNs.
- To determine if gene expression alone is sufficient for classifying CCPN types.
Main Methods:
- Projection-dependent single-cell transcriptomic analysis.
- Monosynaptic rabies tracing in mouse primary visual cortex.
Main Results:
- Layer 2/3 CCPNs projecting to different higher visual areas exhibit systematic gene expression differences.
- Despite these differences, these neurons form a single transcriptomic cluster.
- CCPNs receive selective feedback from their projection targets.
Conclusions:
- Gene expression analysis alone is insufficient for complete neuron type identification.
- Understanding cortical feedback circuits requires integrating transcriptomic and projection data.
- This study refines the classification of CCPNs and sheds light on cortical circuit organization.
