Characterizing the morphology of somatostatin‐expressing interneurons and their synaptic innervation pattern in the barrel cortex of the GFP‐expressing inhibitory neurons mouse
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Somatostatin-expressing (SST+) cells form the second largest subpopulation of neocortical GABAergic neurons that contain diverse subtypes, which participate in layer-specific cortical circuits. Martinotti cells, as the most abundant subtype of SST+ interneurons, are mainly located in layers II/III and V/VI, and are characterized by dense axonal arborizations in layer I. GFP-expressing inhibitory neurons (GIN), representing a fraction of mainly upper layer SST+ interneurons in various cortical areas, were recently claimed to include both Martinotti cells and non-Martinotti cells. This makes it necessary to examine in detail the morphology and synaptic innervation pattern of the GIN cells, in order to better predict their functional implications. In our study, we characterized the neurochemical specificity, somatodendritic morphology, synaptic ultrastructure as well as synaptic innervation pattern of GIN cells in the barrel cortex in a layer-specific manner. We showed that GIN cells account for 44% of the SST+ interneurons in layer II/III and around 35% in layers IV and Va. There are 29% of GIN cells coexpressing calretinin with 54% in layer II/III, 8% in layer IV, and 13% in layer V. They have diverse somatodendritic configurations and form relatively small synapses across all examined layers. They almost exclusively innervate dendrites of excitatory cells, preferentially targeting distal apical dendrites and apical dendritic tufts of pyramidal neurons in layer I, and rarely target other inhibitory neurons. In summary, our study reveals unique features in terms of the morphology and output of GIN cells, which can help to better understand their diversity and structure-function relationships.
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There is no absolute definition of a Martinotti cell based on the total amount of axon in layer 1, although it is generally described as significant.
“We are not aware of an absolute definition of a Martinotti cell in terms of total amount of axon in L1, though it is generally described as “significant” (Tremblay et al., 2016; Zhou et al., 2020).”
From Integrated Morphoelectric and Transcriptomic Classification of Cortical GABAergic Cells (2020) · cites this paper as Zhou et al., 2020
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- Authors
- Zhou, X., Mansori, I., Fischer, T., Witte, M., & Staiger, J. F.
- Affiliations
- Universitätsmedizin Göttingen (DE)
- Corresponding author
- Staiger, Jochen F.
- Venue
- Journal of Comparative Neurology
- Publisher
- Wiley
- Published
- 2019-08-24
- Volume
- 528
- Issue
- 2
- Pages
- 244-260
- ISSN
- 0021-9967 (ISSN-L)
- 1096-9861
- OpenAlex
- W2969166079
- Cited by
- 18
- References
- 61
- Citations by year
- 2026: 3 · 2025: 2 · 2024: 3 · 2023: 1 · 2022: 2 · 2021: 3 · 2020: 3 · 2019: 1
- FWCI
- 1.07
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- The Journal of Comparative Neurology (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- GoeScholar The Publication Server of the Georg-August-Universität Göttingen (Georg-August-Universität Göttingen) (submittedVersion, cc-by-nc)
- Funders
- Deutsche Forschungsgemeinschaft (CRC 889, STA 431/14‐1)
- 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 › Memory and Neural Mechanisms
- Keywords
- Martinotti cells, barrel cortex, GABAergic interneurons, dendritic synapses, pyramidal neurons
- MeSH terms
- Animals, Interneurons, Mice, Transgenic, Somatostatin, Synapses, Neocortex, Green Fluorescent Proteins, Mice
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