Cited by 417Single-cell and spatial transcriptomicsCell Image Analysis TechniquesNeuroscience and Neuropharmacology Research

Morphological diversity of single neurons in molecularly defined cell types

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Peng, Hanchuan, Xie, Peng, Liu, Lijuan, Kuang, Xiuli, Wang, Yimin, Qu, Lei, Gong, Hui, Jiang, Shengdian +70 more·2021·Nature

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Abstract

Dendritic and axonal morphology reflects the input and output of neurons and is a defining feature of neuronal types 1,2 , yet our knowledge of its diversity remains limited. Here, to systematically examine complete single-neuron morphologies on a brain-wide scale, we established a pipeline encompassing sparse labelling, whole-brain imaging, reconstruction, registration and analysis. We fully reconstructed 1,741 neurons from cortex, claustrum, thalamus, striatum and other brain regions in mice. We identified 11 major projection neuron types with distinct morphological features and corresponding transcriptomic identities. Extensive projectional diversity was found within each of these major types, on the basis of which some types were clustered into more refined subtypes. This diversity follows a set of generalizable principles that govern long-range axonal projections at different levels, including molecular correspondence, divergent or convergent projection, axon termination pattern, regional specificity, topography, and individual cell variability. Although clear concordance with transcriptomic profiles is evident at the level of major projection type, fine-grained morphological diversity often does not readily correlate with transcriptomic subtypes derived from unsupervised clustering, highlighting the need for single-cell cross-modality studies. Overall, our study demonstrates the crucial need for quantitative description of complete single-cell anatomy in cell-type classification, as single-cell morphological diversity reveals a plethora of ways in which different cell types and their individual members may contribute to the configuration and function of their respective circuits.

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  • In Gnb4-Cre mice, no labelled cells were found in MOp; all labelled cells were far outside MOp and close to the claustrum.

    “We were unable to find any labelled cells in MOp in the Gnb4-Cre mice: all labelled cells were far outside of MOp and close to the claustrum46.”
  • Within each cortical excitatory subclass, individual neurons show extensive heterogeneity along regional, topographic, and individual (potentially stochastic) axes.

    “Within each subclass, the study also finds extensive heterogeneity among individual neurons; this heterogeneity reflects three axes of variations: regional specificity, topographic specificity and individual (potentially stochastic) variation,”

    From What is a cell type and how to define it? (2022) · cites this paper as Peng et al., 2021

  • A study using complete reconstruction in cortical excitatory neuron subclass-specific Cre driver lines found distinct projection patterns between subclasses, including between IT and ET and between L2/3 IT and L5 IT neurons, confirming subclass level projection specificity.

    “A study using this approach in cortical excitatory neuron subclass-specific Cre driver lines (Peng et al., 2021) reveals distinct projection patterns between subclasses, e.g., not only between IT and ET but also between L2/3 IT and L5 IT neurons, confirming subclass level projection specificity (Fig. 3C).”

    From What is a cell type and how to define it? (2022) · cites this paper as Peng et al., 2021

  • Brain-wide complete reconstruction of single neuron morphology is currently the only method to capture the full extent of a neuron's axon projection pattern and define projection neuron types.

    “Brain-wide complete reconstruction of single neuron morphology is currently the only approach to capture the full extent of a neuron’s axon projection pattern and define projection neuron types (Gao et al., 2022; Peng et al., 2021; Winnubst et al., 2019).”

    From What is a cell type and how to define it? (2022) · cites this paper as Peng et al., 2021

  • These three axes of variation do not readily correlate with transcriptomic types within the subclass.

    “which do not readily correlate with transcriptomic types within the subclass.”

    From What is a cell type and how to define it? (2022) · cites this paper as Peng et al., 2021

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Authors
Peng, H., Xie, P., Liu, L., Kuang, X., Wang, Y., Qu, L., Gong, H., Jiang, S., Li, A., Ruan, Z., Ding, L., Yao, Z., Chen, C., Chen, M., Daigle, T. L., Dalley, R., Ding, Z., Duan, Y., Feiner, A., He, P., Hill, C., Hirokawa, K. E., Hong, G., Huang, L., Kebede, S., Kuo, H.-C., Larsen, R., Lesnar, P., Li, L., Li, Q., Li, X., Li, Y., Li, Y., Liu, A., Lu, D., Mok, S., Ng, L., Nguyen, T. N., Ouyang, Q., Pan, J., Shen, E., Song, Y., Sunkin, S. M., Tasic, B., Veldman, M. B., Wakeman, W., Wan, W., Wang, P., Wang, Q., Wang, T., Wang, Y., Xiong, F., Xiong, W., Xu, W., Ye, M., Yin, L., Yu, Y., Yuan, J., Yuan, J., Yun, Z., Zeng, S., Zhang, S., Zhao, S., Zhao, Z., Zhou, Z., Huang, Z. J., Esposito, L., Hawrylycz, M. J., Sorensen, S. A., Yang, X. W., Zheng, Y., Gu, Z., Xie, W., Koch, C., Luo, Q., Harris, J. A., Wang, Y., & Zeng, H.
Affiliations
  • Allen Institute for Brain Science (US)
  • Southeast University (CN)
  • Wenzhou Medical University (CN)
  • Shanghai University (CN)
  • Anhui University (CN)
  • Wuhan National Laboratory for Optoelectronics (CN)
  • Tencent (China) (CN)
  • University of California, Los Angeles (US)
  • Duke University (US)
  • Hainan University (CN)
Corresponding author
  • Peng, Hanchuan
  • Zeng, Hongkui
Venue
Nature
Published
2021-10-06
Volume
598
Issue
7879
Pages
174-181
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W3202358235
Cited by
417
References
74
Citations by year
2026: 70 · 2025: 93 · 2024: 95 · 2023: 89 · 2022: 45 · 2021: 20 · 2020: 4
FWCI
19.62
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion, cc-by)
  • Research Square (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Cold Spring Harbor Laboratory Institutional Repository (Cold Spring Harbor Laboratory) (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • Wenzhou Medical University
  • Tiny Blue Dot Foundation
  • École Polytechnique Fédérale de Lausanne
  • National Natural Science Foundation of China (GXXT-2019-008, 61721092, 91632201, 61890953, 61871411)
  • Southeast University
  • National Institutes of Health
  • National Institute of Mental Health (U01MH117079, U01MH106008, U01MH105982, U19MH114830)
  • National Eye Institute (R01EY023173)
  • National Institute of Child Health and Human Development
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Single-cell and spatial transcriptomics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Cell Image Analysis Techniques
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
axonal projections, neuronal cell types, mouse brain, cortical neurons, thalamus, striatum, claustrum, cell type classification
MeSH terms
RNA-Seq, Atlases as Topic, Brain, Humans, Neuroglia, Neurons, Reproducibility of Results, Biomarkers, Gene Expression Regulation, Developmental, Neocortex, Cell Shape, Neurogenesis, Single-Cell Analysis

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