Details for: CL4030027

Cell ID: CL4030027

Cell Name: GABAergic amacrine cell

Description: An amacrine cell that uses GABA as a neurotransmitter.

Synonyms: amacrine cell, GABAergic

Selected Context(s): Overall

Gene Significance Landscape

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Genes

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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 GABAergic amacrine cell 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 amacrine cell. 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 amacrine cell. 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 amacrine cell. 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 amacrine cell (CL4030027)

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Nodes (Genes):
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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 The [GABAergic amacrine cell](/details-cell/CL4030027) is an inhibitory interneuron within the retina, critical for processing visual information. Based on its gene significance profile, this cell's identity is defined by a highly specialized molecular machinery for synaptic communication and, notably, a prominent and specific suite of factors involved in RNA processing. The high specificity scores (**Overall** context) for genes encoding neurotransmitter receptors like [GRM5](/details-gene/2915) and [GABBR2](/details-gene/9568), synaptic vesicle proteins such as [SYNPR](/details-gene/132204), and numerous RNA splicing regulators including [PNISR](/details-gene/25957) and [DDX17](/details-gene/10521), suggests that its diverse functions are established and maintained through precise control of both synaptic protein expression and post-transcriptional modification. ## Key Characteristics and Function The molecular profile of the [GABAergic amacrine cell](/details-cell/CL4030027) underscores its central role in shaping retinal signaling through sophisticated regulatory mechanisms. * **Specialized Synaptic Function:** The cell's function is dominated by genes essential for neurotransmission. High specificity of the metabotropic glutamate receptor [GRM5](/details-gene/2915) and the ionotropic AMPA receptor subunit [GRIA4](/details-gene/2893) indicates a finely tuned responsiveness to excitatory inputs, likely from bipolar cells. Concurrently, the specific expression of the GABA-B receptor subunit [GABBR2](/details-gene/9568) is consistent with its GABAergic identity, suggesting a role in autocrine or paracrine feedback regulation. The identity of its presynaptic terminals is further defined by the unique expression of vesicle-associated proteins like [SYNPR](/details-e-gene/132204), [ERC2](/details-gene/26059), and [SYN2](/details-gene/6854). * **Extensive Post-Transcriptional Regulation:** A striking feature of this cell is the high significance of multiple genes involved in RNA processing and alternative splicing. Top markers such as [PNISR](/details-gene/25957), the DEAD box helicase [DDX17](/details-gene/10521), [ARGLU1](/details-gene/55082), and the ribonucleoprotein [HNRNPA2B1](/details-gene/3181) form a distinct functional cluster. This suggests that alternative splicing is a critical mechanism for generating the vast functional and morphological diversity known to exist among different amacrine cell subtypes from a common genetic blueprint. * **Maintenance of Neuronal Architecture:** The highly specific expression of [RTN4](/details-gene/57142) (Reticulon 4, or Nogo), a well-known inhibitor of neurite outgrowth ([Link](https://doi.org/10.1038/35000287)), points to a crucial role in maintaining the stable and highly stratified dendritic architecture of these cells within the inner plexiform layer. This may serve to prevent aberrant synaptic connections and ensure the precision of retinal circuits. This function is supported by the specific expression of the motor protein [KIF5C](/details-gene/3800), essential for axonal transport, and cell adhesion molecules like [CNTNAP4](/details-gene/85445). * **Distinct Metabolic Profile:** The anti-marker analysis reveals a significant negative enrichment for numerous genes encoding core components of the mitochondrial electron transport chain and ATP synthesis, including multiple cytochrome c oxidase subunits ([COX4I1](/details-gene/1327), [COX6C](/details-gene/1345), [COX7C](/details-gene/1350)) and ATP synthase subunits ([ATP5F1E](/details-gene/514), [ATP5MG](/details-gene/10632)). This pattern does not imply a lack of energy production but strongly suggests a specialized metabolic state that is less reliant on oxidative phosphorylation compared to the average cell type, possibly indicating a preference for glycolytic pathways. ## Clinical Significance and Contextual Roles While this analysis is performed in an **Overall** context without a specific disease state, the specific gene signature of GABAergic amacrine cells has implications for various neuropathologies. The high specificity of neurotransmitter receptors like [GRM5](/details-gene/2915) and [GRIA4](/details-gene/2893) highlights these cells as potential targets in diseases involving retinal signaling imbalances, such as certain forms of congenital stationary night blindness or diabetic retinopathy. Dysregulation of their GABAergic output, modulated by receptors like [GABBR2](/details-gene/9568), could contribute to excitotoxicity or altered visual processing. Furthermore, the expression of [RTN4](/details-gene/57142), a major research target for inhibiting regeneration after central nervous system injury, suggests that amacrine cells actively participate in stabilizing retinal circuitry. Modulating [RTN4](/details-gene/57142) activity could be a double-edged sword in retinal repair, potentially promoting regeneration at the cost of circuit stability. The neuregulin [NRG3](/details-gene/10718), a gene linked to schizophrenia ([Link](https://doi.org/10.1073/pnas.94.18.9562)), is also a specific marker, hinting that subtle alterations in retinal processing mediated by these cells could be an endophenotype associated with broader neurological conditions. Finally, the cell's reliance on a specific suite of splicing factors suggests that mutations or dysregulation of these factors could lead to amacrine cell dysfunction, contributing to complex and difficult-to-diagnose visual disorders. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The high specificity of multiple RNA binding and splicing factors, including [PNISR](/details-gene/25957), [DDX17](/details-gene/10521), and [ARGLU1](/details-gene/55082), indicates that extensive and cell-type-specific alternative splicing is a primary mechanism for generating the functional diversity observed among GABAergic amacrine cell subtypes. * **Surprising Findings:** The prominence of splicing-related factors, rivaling that of core synaptic proteins, suggests that post-transcriptional regulation is a central and defining feature of this cell's identity, rather than an ancillary process. * **Testable Questions:** Does single-cell, long-read RNA sequencing of GABAergic amacrine cells reveal distinct isoform expression patterns for key synaptic genes (e.g., [GRM5](/details-gene/2915), [GABBR2](/details-gene/9568)) that correlate with morphologically or electrophysiologically distinct amacrine cell subtypes? 2. **Hypothesis:** The specific co-expression of the potent neurite growth inhibitor [RTN4](/details-gene/57142) with a gene profile negatively enriched for canonical oxidative phosphorylation components (e.g., [COX4I1](/details-gene/1327), [ATP5MG](/details-gene/10632)) suggests that GABAergic amacrine cells maintain their highly stable and complex dendritic arbors within a specialized, potentially glycolytic, metabolic state tailored to their specific lamina in the retina. * **Surprising Findings:** The strong negative signature for multiple core mitochondrial respiratory chain components is unexpected for a neuron and suggests a specialized metabolic adaptation, perhaps to function within specific oxygen tension microenvironments of the inner retina. * **Testable Questions:** Does conditional knockout of [RTN4](/details-gene/57142) in GABAergic amacrine cells lead to aberrant dendritic sprouting and synaptic instability in the adult retina, and can this be visualized using in vivo imaging? Furthermore, does this perturbation alter the cell's metabolic flux, as measured by in situ metabolic imaging or Seahorse analysis of isolated cells?