Details for: CL0000617

Cell ID: CL0000617

Cell Name: GABAergic neuron

Description: A neuron that uses GABA as a vesicular neurotransmitter

Synonyms: GABA-ergic neuron

Selected Context(s): Overall

Gene Significance Landscape

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Score:
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Genes

Contexts:

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 GABAergic neuron 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 GABAergic neuron. 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 GABAergic neuron. 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 GABAergic neuron. 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.

Maximum number of selected genes.
Select a context for the baseline cell.
Select a context for the target cell.
Target Cell for CSI:  GABAergic neuron (CL0000617)

 Legend
Nodes (Genes):
 Query Gene
Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
 Very High
 High
 Medium
 Low
 Very Low
 N/A or Not Sig.
Edges (Interactions):
 STRING (Protein-Protein)
 ONTOLOGY (Shared Pathway)
 Colors vary by pathway category; default arrow applies.

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## Summary A [GABAergic neuron](/details-cell/CL0000617) is a specialized neuron that utilizes gamma-aminobutyric acid (GABA) as its primary inhibitory neurotransmitter. **Overall**, the gene significance profile underscores this cell's fundamental role in establishing and maintaining complex synaptic architecture and signaling within the central nervous system. The high specificity scores (`csi_z`) for genes involved in cell adhesion ([CSMD3](/details-gene/114788), [PCDHAC2](/details-gene/56134)), neurotransmitter receptor function ([GRM5](/details-gene/2915), [GABRB2](/details-gene/2561)), and ion transport ([KCND2](/details-gene/3751)) highlight a molecular program dedicated to precise neuronal connectivity, signal reception, and the regulation of inhibitory tone. The top marker, [PRSS55](/details-gene/203074), a serine protease, suggests a potentially novel and highly specific role in modulating the synaptic environment. ## Key Characteristics and Function Analysis of top marker genes, defined by their high expression specificity, reveals several core functional clusters that define the [GABAergic neuron](/details-cell/CL0000617). * **Synaptic Architecture and Cell Adhesion:** A prominent feature of this cell type is the highly specific expression of numerous genes involved in forming and maintaining synaptic connections. This includes members of the protocadherin family, such as [PCDHAC2](/details-gene/56134) and [PCDHGB5](/details-gene/56101), which are crucial for neuronal recognition and circuit assembly ([Link](https://doi.org/10.1016/s0092-8674(00)80789-8)). Additionally, the CUB and Sushi multiple domains proteins [CSMD1](/details-gene/64478) and [CSMD3](/details-gene/114788), along with [CNTNAP5](/details-gene/129684), further emphasize a role in cell-cell adhesion and likely contribute to the specificity of inhibitory synapses. The postsynaptic scaffolding protein [DLGAP2](/details-gene/9228) and the synaptic vesicle-associated proteins [SYN2](/details-gene/6854) and [SYNPR](/details-gene/132204) complete this picture, highlighting a cell specialized for both the structural integrity and functional machinery of the synapse. * **Neurotransmitter Signaling and Modulation:** As expected, genes central to neurotransmission are highly significant. The expression of [GABRB2](/details-gene/2561), a subunit of the GABA-A receptor, directly reflects the cell's canonical inhibitory function. Interestingly, high specificity is also observed for receptors that mediate responses to other neurotransmitters, including the metabotropic glutamate receptor [GRM5](/details-gene/2915) and the muscarinic acetylcholine receptor [CHRM2](/details-gene/1129). This suggests that GABAergic neurons are not only sources of inhibition but are themselves sophisticated points of integration, finely tuning their activity in response to both excitatory and modulatory inputs. * **Regulation of Neuronal Excitability:** The cell's electrical properties are defined by specific ion channels and transporters. [KCND2](/details-gene/3751), a voltage-gated potassium channel, plays a direct role in shaping the action potential. Furthermore, [SLC24A2](/details-gene/25769), a potassium-dependent sodium-calcium exchanger, is critical for maintaining calcium homeostasis, a process essential for regulating neurotransmitter release and preventing excitotoxicity. * **Proteolytic and Hydrolase Activity:** The two most specific markers, [PRSS55](/details-gene/203074) (serine-type endopeptidase activity) and [TMPPE](/details-gene/643853) (hydrolase activity), have less defined roles in neuronal function. Their exceptional specificity suggests they may perform specialized tasks in this context, possibly related to the processing of neuropeptides, modification of the extracellular matrix around synapses, or regulation of receptor turnover. **Conversely**, the anti-marker profile reveals what this cell is not defined by. The strong negative CSI scores for numerous mitochondrially-encoded genes (e.g., [ND1](/details-gene/4535), [COX1](/details-gene/4512), [CYTB](/details-gene/4519)) and ubiquitous housekeeping genes involved in iron storage ([FTL](/details-gene/2512)), protein synthesis ([TPT1](/details-gene/7178)), and RNA processing ([DDX5](/details-e/1655)) do not imply their absence. Instead, this pattern indicates that the identity of a [GABAergic neuron](/details-cell/CL0000617) is established by its unique complement of specialized synaptic and signaling proteins, rather than by a uniquely high level of basal metabolic or cellular maintenance machinery, which is shared more broadly across cell types. ## Clinical Significance and Contextual Roles The gene signature of [GABAergic neurons](/details-cell/CL0000617) provides insight into their potential involvement in neurological and psychiatric disorders, where imbalances in inhibitory and excitatory signaling are often implicated. * **Epilepsy and Seizure Disorders:** The high specificity of genes controlling neuronal excitability and synaptic function is consistent with the central role of GABAergic dysfunction in epilepsy. Notably, [CSMD3](/details-gene/114788) has been identified as a candidate gene for benign adult familial myoclonic epilepsy, a finding that highlights the importance of cell adhesion molecules in maintaining stable neuronal circuits ([Link](https://doi.org/10.1016/s0006-291x(03)01555-9)). * **Psychiatric Disorders:** Alterations in GABAergic signaling are a key feature of disorders like schizophrenia and bipolar disorder. The high significance of the GABA-A receptor subunit [GABRB2](/details-gene/2561) is clinically relevant, as alternative splicing of this gene has been linked to both conditions ([Link](https://doi.org/10.1371/journal.pone.0006977)). This suggests that disruptions in the molecular composition of GABA receptors on these neurons could be a key etiological factor. * **Neurodevelopmental and Neurodegenerative Disorders:** The strong enrichment for genes governing synaptic specificity and adhesion ([PCDHAC2](/details-gene/56134), [CSMD1](/details-gene/64478), [CNTNAP5](/details-gene/129684)) implicates these cells in the correct wiring of the brain during development. Pathogenic variants in these genes could potentially lead to neurodevelopmental disorders by disrupting the formation of appropriate inhibitory circuits. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The top-ranked gene, [PRSS55](/details-gene/203074), a serine protease, functions as a highly localized modulator of the synaptic microenvironment, specifically cleaving cell-surface adhesion molecules or extracellular matrix components to regulate the plasticity and stability of inhibitory synapses. * **Surprising Findings:** It is unexpected that a secreted protease would exhibit greater cell-type specificity than canonical intracellular synaptic proteins or neurotransmitter receptors. This suggests its function is not general but is instead tightly coupled to the unique biology of [GABAergic neurons](/details-cell/CL0000617). * **Testable Questions:** Does the targeted inhibition of [PRSS55](/details-gene/203074) activity in vivo alter the turnover rate of postsynaptic GABA receptors or affect the structural integrity of dendritic spines receiving inhibitory inputs? 2. **Hypothesis:** The concurrent high-specificity expression of multiple, distinct families of large cell adhesion molecules (e.g., protocadherins like [PCDHAC2](/details-gene/56134) and CSMD proteins like [CSMD3](/details-gene/114788)) constitutes a combinatorial "adhesion code" that dictates the precise targeting and connectivity of different subtypes of GABAergic interneurons to their postsynaptic partners. * **Surprising Findings:** The data suggest that synaptic specificity is not governed by a single receptor-ligand interaction but by a complex, multi-protein system. The high ranking of several members of these families implies a level of combinatorial complexity that may define functional subclasses of [GABAergic neurons](/details-cell/CL0000617). * **Testable Questions:** Can single-cell transcriptomics combined with circuit mapping reveal specific correlations between the expression patterns of [PCDHAC2](/details-gene/56134), [CSMD3](/details-gene/114788), and [CNTNAP5](/details-gene/129684) and the specific cell types that a [GABAergic neuron](/details-cell/CL0000617) synapses onto?