Details for: CL4023016

Cell ID: CL4023016

Cell Name: VIP GABAergic cortical interneuron

Description: A transcriptomically distinct GABAergic neuron derived from the CGE and that expresses the vasoactive intestinal polypeptide. Its soma is located in the forebrain.

Synonyms: VIP interneuron, VIP neuron, VIP neuron, VIP type, VIP-Expressing GABAergic Neuron, VIP-IN, Vip GABAergic neuron, Vip

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 VIP 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 VIP 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 VIP 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 VIP 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:  VIP GABAergic cortical interneuron (CL4023016)

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## Summary The [VIP GABAergic cortical interneuron](/details-cell/CL4023016) is a distinct subclass of inhibitory neuron originating from the caudal ganglionic eminence (CGE) and characterized by its expression of Vasoactive Intestinal Polypeptide. Based on its unique gene expression profile, this cell type appears to be a highly specialized signaling hub within the cortex. Its identity is defined by a unique co-expression of genes involved in G-protein coupled receptor signaling, synaptic organization, and neuropeptide processing. The high specificity of markers such as [GNAS](/details-gene/2778) and multiple GABA/glutamate receptor subunits suggests a primary role in modulating cortical circuit activity and maintaining the fine balance between excitation and inhibition. ## Key Characteristics and Function The functional identity of the [VIP GABAergic cortical interneuron](/details-cell/CL4023016) is underscored by several clusters of highly specific genes. * **Synaptic Signaling and Integration:** This interneuron is intricately involved in both inhibitory and excitatory signaling. It expresses a suite of specific GABA and glutamate receptor subunits, including [GABBR2](/details-gene/9568) (GABA-B), [GABRB2](/details-gene/2561) (GABA-A), [GABRG3](/details-gene/2567) (GABA-A), [GRM5](/details-gene/2915) (mGluR5), and [GRIN2A](/details-gene/2903) (NMDAR2A). This molecular toolkit enables it to receive and integrate diverse inputs from the cortical network, positioning it as a key integrator of local circuit activity. Its machinery for neurotransmitter release is highlighted by the specific expression of synaptic vesicle proteins like [SYNPR](/details-gene/132204) and [SYN2](/details-gene/6854). * **G-Protein Coupled and Neuromodulatory Signaling:** The top specificity marker is [GNAS](/details-gene/2778), the alpha subunit of the stimulatory G-protein (Gs). This is highly consistent with the cell's identity, as the VIP receptor itself signals through the Gs-cAMP pathway. The high specificity of [GNAS](/details-gene/2778) suggests this pathway is a central and defining feature of the cell's function. This is further supported by the expression of key calcium signaling molecules like [CALM1](/details-gene/801) (Calmodulin) and the plasma membrane calcium pump [ATP2B2](/details-gene/491), which are critical for translating receptor activation into downstream cellular responses while maintaining ionic homeostasis. * **Circuit Assembly and Structural Stability:** The neuron expresses an extensive and specific array of cell adhesion and guidance molecules, including [CSMD3](/details-gene/114788), [CSMD1](/details-gene/64478), [CNTNAP4](/details-gene/85445), [KIRREL3](/details-gene/84623), and [DSCAM](/details-gene/1826). This suggests a role in establishing highly precise synaptic connections during development. Concurrently, the high specificity of [RTN4](/details-gene/57142), a potent inhibitor of neurite outgrowth, may indicate a function in stabilizing these established circuits and limiting excessive structural plasticity in the mature cortex. * **Neuropeptide Processing:** The specific expression of [PCSK2](/details-gene/5126), a proprotein convertase, strongly supports the cell's canonical function in producing and secreting mature Vasoactive Intestinal Polypeptide, its namesake neuropeptide, which acts as a powerful local neuromodulator. * **Negative Markers:** The cell is defined as much by what it lacks as by what it expresses. **Overall**, there is a strong negative enrichment for genes involved in ubiquitous cellular processes, including mitochondrial respiration (e.g., [COX4I1](/details-gene/1327), [COX7C](/details-gene/1350)), iron metabolism ([FTH1](/details-gene/2495), [FTL](/details-gene/2512)), and general protein degradation ([UBB](/details-gene/7314), [UBC](/details-gene/7316)). This pattern suggests that the cell's unique transcriptional identity is dominated by specialized signaling and connectivity functions rather than by a high basal metabolic rate. ## Clinical Significance and Contextual Roles While this analysis is performed in an **Overall** context, the specific gene markers for the [VIP GABAergic cortical interneuron](/details-cell/CL4023016) have significant clinical implications, suggesting that dysfunction of this cell type could contribute to various neuropathologies. * **Neuropsychiatric Disorders:** Several of the top markers are linked to psychiatric conditions. For example, [GRM5](/details-gene/2915) is a therapeutic target in development for depression and anxiety, while large-scale genetic studies have implicated [CSMD1](/details-gene/64478) as a risk factor for schizophrenia ([Link](https://pubmed.ncbi.nlm.nih.gov/11472063/)). The specific expression of these genes in VIP interneurons suggests that altered function of these cells could disrupt cortical information processing in a manner relevant to these disorders. * **Epilepsy and Neurodevelopmental Disorders:** Mutations in [GRIN2A](/details-gene/2903) are known causes of epilepsy with speech-and-language disorders ([Link](https://pubmed.ncbi.nlm.nih.gov/8768735/)). The highly specific expression of this NMDA receptor subunit in VIP interneurons points to their potential role in the pathophysiology of certain epileptic syndromes, likely through dysregulation of cortical inhibition. * **Neural Injury and Repair:** The high specificity of [RTN4](/details-gene/57142) (Nogo) is particularly noteworthy. As a major inhibitor of axonal regeneration, [RTN4](/details-gene/57142) is a key therapeutic target for promoting recovery after stroke or spinal cord injury. Its specific role in this interneuron subtype in the cortex is less understood but may involve restricting activity-dependent plasticity. Alterations in its expression following injury could impact the potential for cortical remapping and functional recovery. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The high specificity of [GNAS](/details-gene/2778), the Gs-alpha protein, indicates that the canonical VIP-VPAC receptor-Gs-cAMP signaling pathway is a defining and central functional axis of the [VIP GABAergic cortical interneuron](/details-cell/CL4023016). This pathway likely acts as a master regulator of its disinhibitory function, modulating its excitability and GABA release onto other interneurons. * **Surprising Findings:** It is notable that [GNAS](/details-gene/2778) itself, a widely expressed G-protein subunit, emerges as the top specificity marker. This suggests that the *level* and *stoichiometric balance* of the GNAS protein is more tightly and uniquely regulated in this cell type than in others, potentially making it exquisitely sensitive to neuromodulators that use Gs-coupled receptors like VIP itself (autocrine/paracrine signaling) or others like norepinephrine or dopamine. * **Testable Questions:** Does conditional knockout of [GNAS](/details-gene/2778) specifically in [VIP interneurons](/details-cell/CL4023016) ablate their characteristic disinhibitory control over cortical pyramidal cells, and can this effect be mimicked by pharmacological blockade of adenylyl cyclase? 2. **Hypothesis:** The co-expression of numerous specific cell adhesion molecules (e.g., [CSMD3](/details-gene/114788), [CNTNAP4](/details-gene/85445), [DSCAM](/details-gene/1826)) with the potent neurite outgrowth inhibitor [RTN4](/details-gene/57142) suggests that [VIP GABAergic cortical interneurons](/details-cell/CL4023016) play a dual role in cortical circuit development and stability. They may first use adhesion molecules to establish highly specific synaptic contacts and then actively deploy [RTN4](/details-gene/57142) to stabilize these connections and restrict further structural plasticity in the mature circuit. * **Surprising Findings:** The presence of a strong "stop-growth" signal like [RTN4](/details-gene/57142) as a highly specific marker in a cell type known for its dynamic, activity-dependent roles in cortical processing is unexpected. It may indicate that these neurons define stable 'no-go' zones for axonal sprouting, thereby channeling plasticity to other circuit elements. * **Testable Questions:** Using in-vivo two-photon imaging in mice, does the selective removal of [RTN4](/details-gene/57142) from [VIP interneurons](/details-cell/CL4023016) lead to aberrant sprouting of axons from nearby pyramidal neurons or an increase in the turnover rate of dendritic spines on the targets of [VIP interneurons](/details-cell/CL4023016)?