Details for: CL4023018

Cell ID: CL4023018

Cell Name: pvalb GABAergic cortical interneuron

Description: Historically this term was used to refer to all Pvalb expressing GABAergic interneurons, but transcriptomic classification separates out some Pvalb expressing GABAergic interneurons as sibling classes (e.g. Pvalb chandelier). We follow the transcriptomic classifications.

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 pvalb 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 pvalb 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 pvalb 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 pvalb 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:  pvalb GABAergic cortical interneuron (CL4023018)

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Edges (Interactions):
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## Summary The [pvalb GABAergic cortical interneuron](/details-cell/CL4023018) is a class of inhibitory neuron in the cerebral cortex, distinguished by its expression of parvalbumin. Based on its gene significance profile, this cell type is a highly specialized unit for synaptic communication and circuit modulation. The exceptionally high expression specificity of the metabotropic glutamate receptor [GRM5](/details-gene/2915) (CSI: 79.12) underscores its role as a key recipient of excitatory signals, which it integrates to provide fast, precise inhibitory output to cortical networks. This function is further supported by a suite of specific markers for synaptic vesicle cycling, GABAergic signaling, and ion channel activity, positioning it as a central regulator of cortical information processing. ## Key Characteristics and Function The functional identity of the [pvalb GABAergic cortical interneuron](/details-cell/CL4023018) is defined by a constellation of highly specific genes related to neurotransmission and synaptic architecture. * **Synaptic Signaling and Receptors:** The cell's primary role in modulating neural circuits is highlighted by top markers involved in both receiving and transmitting signals. Its identity is strongly marked by the G protein-coupled glutamate receptor [GRM5](/details-gene/2915), indicating a critical function in responding to excitatory inputs. This is complemented by high specificity for components of the inhibitory GABAergic system, including GABA-A receptor subunits [GABRB2](/details-gene/2561) and [GABRG3](/details-gene/2567), and the GABA-synthesizing enzyme [GAD2](/details-gene/2572). The presence of the kainate receptor [GRIK1](/details-gene/2897) further expands its capacity to sense glutamatergic signals. Key proteins for synaptic vesicle function, such as [SYN2](/details-gene/6854), and postsynaptic scaffolding, including [DLGAP2](/details-gene/9228) and [LRRC7](/details-gene/57554), solidify its role as a dedicated synaptic specialist. * **Ion Homeostasis and Excitability:** Precise control of neuronal firing is essential for this interneuron's function. This is reflected in the specific expression of various ion channels and transporters. Key markers include the voltage-gated potassium channel [KCND2](/details-gene/3751), the calcium-gated chloride channel [ANO4](/details-gene/121601), and the sodium/potassium/calcium exchanger [SLC24A2](/details-gene/25769). The high specificity of the calcium-binding protein [CALM1](/details-gene/801) further suggests that calcium-dependent signaling pathways are fundamental to its activity. * **Structural Integrity and Neurite Maintenance:** The data suggest this interneuron plays a role in maintaining a stable circuit architecture. A highly specific marker is [RTN4](/details-gene/57142) (Reticulon 4, or Nogo), a well-known inhibitor of neurite outgrowth ([Link](https://pubmed.ncbi.nlm.nih.gov/10667780/)). This, along with cell adhesion molecules like [CNTNAP5](/details-gene/129684) and [KIRREL3](/details-gene/84623), and the dendrite development regulator [CSMD3](/details-gene/114788), points towards a cell that actively restricts structural plasticity, thereby contributing to the stability of established cortical circuits. * **Distinct Metabolic and Housekeeping Profile:** The anti-markers for this cell are overwhelmingly composed of genes involved in ubiquitous cellular processes. These include multiple components of mitochondrial respiratory chain complexes ([COX3](/details-gene/4514), [COX4I1](/details-gene/1327), [COX5B](/details-gene/1329), [COX7C](/details-gene/1350), [UQCRB](/details-gene/7381]), ATP synthase ([ATP5F1E](/details-gene/514), [ATP5MG](/details-gene/10632)), the ubiquitin system ([UBB](/details-gene/7314), [UBC](/details-gene/7316)), and general metabolism ([GAPDH](/details-gene/2597)). This negative signature strongly implies that the defining characteristic of this interneuron is not its core metabolism but its highly specialized and unique investment in synaptic machinery. ## Clinical Significance and Contextual Roles **Overall**, the gene expression profile of the [pvalb GABAergic cortical interneuron](/details-cell/CL4023018) implicates it in several neurological and psychiatric disorders. The disruption of the delicate excitatory/inhibitory balance, which this cell helps maintain, is a central theme in many CNS pathologies. Several of its top marker genes have been directly linked to human disease. For instance, [CSMD3](/details-gene/114788) has been identified as a candidate gene for benign adult familial myoclonic epilepsy ([Link](https://pubmed.ncbi.nlm.nih.gov/12943675/)). Furthermore, alternative splicing of the GABA-A receptor subunit [GABRB2](/details-gene/2561) has been associated with psychotic disorders ([Link](https://doi.org/10.1371/journal.pone.0006977)). The high specificity of [RTN4](/details-gene/57142), a major inhibitor of axonal regeneration, suggests that these interneurons may contribute to the difficulty of functional recovery after brain injury by maintaining an inhibitory environment for neural repair. The specific expression of synaptic proteins like [SYN2](/details-gene/6854) and scaffolding molecules such as [DLGAP2](/details-gene/9228) and [CSMD1](/details-gene/64478) further highlights this cell's potential vulnerability in synaptopathies, a class of disorders involving synaptic dysfunction. ## Potential Mechanisms and Research Directions 1. **Hypothesis: pvalb interneurons act as sophisticated integrators of excitatory input via metabotropic glutamate signaling to precisely control cortical inhibition.** * **Surprising Findings:** The most specific marker for this GABAergic inhibitory neuron is not a GABA-related gene, but rather the metabotropic *glutamate* receptor [GRM5](/details-gene/2915). This suggests that its primary defining feature, relative to other cells, is its unique capacity to respond to and process excitatory signals, which in turn dictates its inhibitory output. * **Testable Questions:** How does pharmacological modulation or genetic silencing of [GRM5](/details-gene/2915) specifically within [pvalb GABAergic cortical interneuron](/details-cell/CL4023018) populations affect their firing rate, the magnitude of GABA release at their synaptic terminals, and the synchrony of local cortical network oscillations? 2. **Hypothesis: pvalb interneurons actively stabilize cortical circuits in the mature brain by expressing potent inhibitors of structural plasticity.** * **Surprising Findings:** The high expression specificity of [RTN4](/details-gene/57142), a potent and well-characterized inhibitor of neurite outgrowth, is unexpected for a cell type that must form and maintain extensive synaptic connections. This suggests an active, ongoing process of restricting, rather than promoting, axonal and dendritic sprouting in its local environment. * **Testable Questions:** Does conditional knockout of [RTN4](/details-gene/57142) in adult cortical [pvalb GABAergic cortical interneuron](/details-cell/CL4023018)s lead to aberrant sprouting of their own axons or those of neighboring excitatory neurons, and does this altered structural plasticity affect learning and memory tasks?