Cited by 14Neuroscience and Neuropharmacology ResearchBiotin and Related StudiesGenetics and Neurodevelopmental Disorders

Synaptic signatures and disease vulnerabilities of layer 5 pyramidal neurons

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Marcassa, Gabriele, Dascenco, Dan, Lorente-Echeverría, Blanca, Daaboul, Danie, Vandensteen, Jeroen, Leysen, Elke, Baltussen, Lucas, Howden, Andrew J. M. +1 more·2025·Nature Communications

Published version of a preprint

Abstract

Cortical layer 5 (L5) intratelencephalic (IT) and pyramidal tract (PT) neurons are embedded in distinct information processing pathways. Their morphology, connectivity, electrophysiological properties, and role in behavior have been extensively analyzed. However, the molecular composition of their synapses remains largely uncharacterized. Here, we dissect the protein composition of the excitatory postsynaptic compartment of mouse L5 neurons in intact somatosensory circuits, using an optimized proximity biotinylation workflow with high spatial accuracy. We find distinct synaptic signatures of L5 IT and PT neurons that are defined by proteins regulating synaptic organization and transmission, including cell-surface proteins (CSPs), neurotransmitter receptors and ion channels. In addition, we find a differential vulnerability to disease, with a marked enrichment of autism risk genes in the synaptic signature of L5 IT neurons compared to PT neurons. These results align with human studies and suggest that the excitatory postsynaptic compartment of L5 IT neurons is susceptible in autism. Our approach is versatile and can be broadly applied to other neuron types to create a protein-based, synaptic atlas of cortical circuits.

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Authors
Marcassa, G., Dascenco, D., Lorente-Echeverría, B., Daaboul, D., Vandensteen, J., Leysen, E., Baltussen, L., Howden, A. J. M., & de Wit, J.
Affiliations
  • VIB-KU Leuven Center for Brain & Disease Research (BE)
  • University of Dundee (GB)
Venue
Nature Communications
Published
2025-01-02
Volume
16
Issue
1
Pages
228-228
ISSN
2041-1723 (ISSN-L)
OpenAlex
W4406001182
Cited by
14
References
13
Citations by year
2026: 6 · 2025: 7 · 2024: 1
FWCI
5.10
Type
journal article
Language
en
Open access
Locations
  • Nature Communications (publishedVersion, cc-by-nc-nd)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Discovery Research Portal (University of Dundee) (publishedVersion, cc-by-nc-nd)
  • Lirias (submittedVersion, cc-by-nc-nd)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Fonds Wetenschappelijk Onderzoek (11F1219N, G0C4518N, 11F1221N, G0H2818N)
  • KU Leuven
  • Vlaamse regering
  • National Institute of Mental Health
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Biotin and Related Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
Keywords
intratelencephalic neurons, pyramidal tract neurons, proximity biotinylation, autism risk genes, disease susceptibility, cell surface proteins, neurotransmitter receptors, ion channels
MeSH terms
Animals, Autistic Disorder, Female, Humans, Male, Membrane Proteins, Mice, Inbred C57BL, Synaptic Transmission, Pyramidal Tracts, Somatosensory Cortex, Synapses, Pyramidal Cells, Mice

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