Details for: CL4023015

Cell ID: CL4023015

Cell Name: sncg GABAergic cortical interneuron

Description: A transcriptomically distinct GABAergic neuron located in the cerebral cortex that expresses Gamma-synuclein.

Selected Context(s): Overall

Gene Significance Landscape

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Cell Significance Index (CSI) is uniquely calculated to reveal cell-specific gene markers. More info here

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for sncg GABAergic cortical interneuron within the selected context(s).

Gene ID: A unique numerical identifier for this specific gene.
Symbol: Shortened abbreviation or name that represents this gene.
Ensembl Gene ID: A unique identifier assigned by Ensembl for genomic data mapping.
CSI Score: A combined effect size and statistical significance measure for sncg GABAergic cortical interneuron. Higher scores indicate a stronger, more significant difference in expression.
(Previously described as "Fold Change", but now represents Cliff's Delta × –log10(p).)

Gene ID: A unique numerical identifier for this specific gene.
Symbol: Shortened abbreviation or name that represents this gene.
Ensembl Gene ID: A unique identifier assigned by Ensembl for genomic data mapping.
CSI Score: A combined effect size and statistical significance measure for sncg GABAergic cortical interneuron. Higher scores indicate a stronger, more significant difference in expression.
Average CSI: csi sum / gene count
Cell network configuration

This network visualizes key genes for sncg GABAergic cortical interneuron. It primarily includes:
1. Top genes highly significant for this cell (Num. Top Cell Genes - based on the 'Min. CSI' setting).
2. Any additional specific 'Context Genes' you add below.
The final network is a combined view. Choose an Interaction Source (pathways or protein interactions) and optionally compare CSI scores with a Baseline Cell Type.

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Target Cell for CSI:  sncg GABAergic cortical interneuron (CL4023015)

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Edges (Interactions):
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## Summary The sncg GABAergic cortical interneuron ([CL4023015](/details-cell/CL4023015)) is an inhibitory neuron within the cerebral cortex, defined by the expression of Gamma-synuclein. The transcriptomic profile of this cell type, based on expression specificity (**Overall**), reveals a sophisticated functional identity centered on synaptic communication and neuromodulation. The high specificity of genes essential for GABA synthesis ([GAD2](/details-gene/2572)) and reception ([GABBR2](/details-gene/9568), [GABRB2](/details-gene/2561)) confirms its canonical inhibitory role. Concurrently, the prominence of G-protein signaling components like [GNAS](/details-gene/2778) and metabotropic glutamate receptors like [GRM5](/details-gene/2915) suggests this neuron functions as a critical integration hub, modulating its inhibitory output in response to diverse signals within the cortical microcircuit. A suite of highly specific cell adhesion molecules, including [RTN4](/details-gene/57142) and [CSMD3](/details-gene/114788), underscores the importance of precise structural wiring for its function. ## Key Characteristics and Function The functional identity of the [sncg GABAergic cortical interneuron](/details-cell/CL4023015) is defined by several key gene clusters. * **Inhibitory Synaptic Transmission:** The cell's fundamental role as an inhibitory neuron is strongly supported by the specific expression of genes core to the GABAergic system. This includes [GAD2](/details-gene/2572), the enzyme responsible for synthesizing GABA from glutamate, as well as subunits for both metabotropic ([GABBR2](/details-gene/9568)) and ionotropic ([GABRB2](/details-gene/2561)) GABA receptors. This suggests the cell partakes in both fast and slow inhibitory signaling. This function is further supported by the specific expression of synaptic vesicle proteins [SYN2](/details-gene/6854) and [SYNPR](/details-gene/132204), and the postsynaptic density component [LRRC7](/details-gene/57554), indicating a complete machinery for neurotransmitter release and synaptic organization. * **Neuromodulatory Signal Integration:** Beyond its GABAergic identity, this interneuron appears to be a sophisticated integrator of extracellular signals. The top marker, [GNAS](/details-gene/2778), encodes a stimulatory G-protein alpha subunit, indicating a high capacity for G-protein-coupled receptor (GPCR) signaling. This is complemented by the highly specific expression of the metabotropic glutamate receptor [GRM5](/details-gene/2915) and the glutamate receptor [GRID1](/details-gene/2894), positioning the cell to dynamically respond to excitatory inputs. The presence of the neuropeptide-processing enzyme [PCSK2](/details-gene/5126) suggests it may also co-release neuropeptides, enabling it to exert longer-lasting modulatory effects on the cortical circuit. * **Synaptic Adhesion and Structural Stability:** A notable feature of this cell is the specific expression of numerous genes involved in cell adhesion and neuronal structure. These include [CSMD3](/details-gene/114788), [CNTNAP4](/details-gene/85445), [KIRREL3](/details-gene/84623), and [LINGO2](/details-gene/158038). This molecular toolkit likely establishes and maintains the precise synaptic connections that are crucial for interneuron function. The high specificity of [RTN4](/details-gene/57142), a well-known inhibitor of neurite outgrowth ([Link](https://doi.org/10.1038/35000287)), may indicate a role in stabilizing established circuits and limiting aberrant plasticity in the adult brain. * **Distinct Metabolic and Immune Profile:** The anti-markers for this cell type help refine its identity. The negative significance scores for multiple components of the mitochondrial electron transport chain, such as [COX4I1](/details-gene/1327), [COX7C](/details-gene/1350), and [ATP5MG](/details-gene/10632), distinguish it from cells with exceptionally high metabolic demands. Furthermore, the low specificity of [B2M](/details-gene/567), a key component of MHC class I molecules, confirms its distinct lineage from antigen-presenting cells like microglia. ## Clinical Significance and Contextual Roles GABAergic interneurons are fundamental for maintaining the excitatory/inhibitory balance in the cortex, and their dysfunction is implicated in numerous neurological and psychiatric disorders. The specific molecular markers of the [sncg GABAergic cortical interneuron](/details-cell/CL4023015) provide potential links to several pathologies. The specific expression of the GABA-A receptor subunit [GABRB2](/details-gene/2561) is noteworthy, as alternative splicing of this gene has been associated with psychotic disorders ([Link](https://doi.org/10.1371/journal.pone.0006977)). Similarly, [CSMD3](/details-gene/114788) has been identified as a candidate gene for benign adult familial myoclonic epilepsy ([Link](https://doi.org/10.1016/s0006-291x(03)01555-9)), highlighting the direct relevance of this cell's adhesion molecules to seizure disorders. Genes involved in glutamatergic signaling, such as [GRM5](/details-gene/2915), are established targets for therapies in anxiety, depression, and schizophrenia. Therefore, this specific interneuron subtype, which is highly tuned to glutamate signaling, likely plays a significant role in the pathophysiology of these conditions. The presence of [GAD2](/details-gene/2572), an autoantigen in stiff-person syndrome and type 1 diabetes, further broadens the potential clinical relevance of this cell population. ## Potential Mechanisms and Research Directions 1. **Hypothesis: This interneuron subtype acts as a sophisticated signaling hub that integrates glutamatergic and other neuromodulatory inputs to gate cortical information flow through both fast GABAergic inhibition and slow neuropeptidergic modulation.** * **Surprising Findings:** The most specific marker is not a GABA-related gene but [GNAS](/details-gene/2778), a ubiquitous G-protein subunit. This finding elevates the cell's identity from a simple inhibitory relay to a complex computational node where signal integration is paramount. The high specificity of [RTN4](/details-gene/57142), a molecule known for restricting axonal growth, is also unexpected in a mature neuron and may point to a specialized role in maintaining circuit stability. * **Testable Questions:** Can selective chemogenetic activation of [GRM5](/details-gene/2915)- and other [GNAS](/details-gene/2778)-coupled pathways on these interneurons alter the balance of co-released GABA versus neuropeptides (processed by [PCSK2](/details-gene/5126)) at their synaptic terminals? 2. **Hypothesis: The identity and circuit function of this interneuron are primarily defined by a combinatorial "synaptic code" of cell adhesion molecules that dictates its precise connectivity and partnership with other neuronal subtypes.** * **Surprising Findings:** The sheer number and high specificity of large, structurally complex cell adhesion molecules like [CSMD3](/details-gene/114788), [CNTNAP4](/details-gene/85445), and [KIRREL3](/details-gene/84623) is remarkable. This suggests that the cell's physical "hard-wiring" and synaptic architecture are at least as defining as its neurotransmitter phenotype, a feature that may be critical for its specific computational role. * **Testable Questions:** Does the targeted knockout of [CSMD3](/details-gene/114788) or [CNTNAP4](/details-gene/85445) in these interneurons lead to demonstrable and specific alterations in their synaptic connectivity patterns, as visualized by high-resolution microscopy and trans-synaptic tracing techniques?