Cited by 78Neuroscience and Neuropharmacology ResearchNeural dynamics and brain functionVisual perception and processing mechanisms

The Synaptic Organization of Layer 6 Circuits Reveals Inhibition as a Major Output of a Neocortical Sublamina

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Frandolig, Jaclyn Ellen, Matney, Chanel Joylae, Lee, Kihwan, Kim, Juhyun, Chevée, Maxime, Kim, Su-Jeong, Bickert, Aaron Andrew, Brown, Solange Pezon·2019·Cell Reports

Abstract

The canonical cortical microcircuit has principally been defined by interlaminar excitatory connections among the six layers of the neocortex. However, excitatory neurons in layer 6 (L6), a layer whose functional organization is poorly understood, form relatively rare synaptic connections with other cortical excitatory neurons. Here, we show that the vast majority of parvalbumin inhibitory neurons in a sublamina within L6 send axons through the cortical layers toward the pia. These interlaminar inhibitory neurons receive local synaptic inputs from both major types of L6 excitatory neurons and receive stronger input from thalamocortical afferents than do neighboring pyramidal neurons. The distribution of these interlaminar interneurons and their synaptic connectivity further support a functional subdivision within the standard six layers of the cortex. Positioned to integrate local and long-distance inputs in this sublayer, these interneurons generate an inhibitory interlaminar output. These findings call for a revision to the canonical cortical microcircuit.

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Crossref · 10.1016/j.celrep.2019.08.048

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  • The interlaminar or translaminar projections of these Pvalb met-types resemble projections previously reported for layer 6 fast-spiking neurons.

    “These interlaminar or translaminar projections resemble those described previously for fast-spiking neurons in L6 (Frandolig et al., 2019; Bortone et al., 2014).”

    From Integrated Morphoelectric and Transcriptomic Classification of Cortical GABAergic Cells (2020) · cites this paper as Frandolig et al., 2019

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Authors
Frandolig, J. E., Matney, C. J., Lee, K., Kim, J., Chevée, M., Kim, S.-J., Bickert, A. A., & Brown, S. P.
Affiliations
Johns Hopkins University (US)
Corresponding author
Brown, Solange Pezon
Venue
Cell Reports
Publisher
Elsevier BV
Published
2019-09
Volume
28
Issue
12
Pages
3131-3143.e5
ISSN
2211-1247 (ISSN-L)
OpenAlex
W2974656325
Cited by
78
References
107
Citations by year
2026: 7 · 2025: 13 · 2024: 5 · 2023: 12 · 2022: 9 · 2021: 18 · 2020: 13 · 2019: 1
FWCI
4.90
Type
journal article
Language
en
Open access
Locations
  • Cell Reports (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Science Foundation (1656592)
  • Johns Hopkins University
  • National Institute of Neurological Disorders and Stroke (P30NS050274)
  • National Research Foundation of Korea (NRF-2011-357-E00005)
  • Center for Outcomes Research and Evaluation, Yale School of Medicine
  • Boehringer Ingelheim
  • Boehringer Ingelheim Fonds
  • Esther A. and Joseph Klingenstein Fund
  • Office of the Provost, Johns Hopkins University
  • National Institutes of Health (5T32EY017203)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
Keywords
layer 6, neocortex, parvalbumin interneurons, cortical microcircuits, thalamocortical afferents, pyramidal neurons, synaptic connectivity
MeSH terms
Animals, Interneurons, Mice, Transgenic, Neural Inhibition, Synapses, Pyramidal Cells, Neocortex, Mice

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