Details for: CL0004232

Cell ID: CL0004232

Cell Name: starburst amacrine cell

Description: An amacrine cell with a flat dendritic arbor and a medium dendritic field. Starburst amacrine cells have post-synaptic terminals in S2. This cell type releases the neurotransmitters gamma-aminobutyric acid (GABA) and acetylcholine.

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 starburst 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 starburst 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 starburst 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 starburst 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:  starburst amacrine cell (CL0004232)

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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 The [starburst amacrine cell](/details-cell/CL0004232) is a specialized interneuron of the retina characterized by its distinct dendritic arbor and its role in releasing both gamma-aminobutyric acid (GABA) and acetylcholine. The gene significance profile, analyzed in an **Overall** context, suggests that this cell's unique identity is profoundly shaped by a complex network of transcriptional and post-transcriptional regulators. The top defining marker, based on expression specificity (`csi_z`), is the RNA-binding protein [MSI2](/details-gene/124540), highlighting that post-transcriptional control of gene expression is a central feature of its biology. This is further supported by the high specificity of chromatin remodelers like [ARID1B](/details-gene/57492) and transcription factors like [CAMTA1](/details-gene/23261), indicating that a tightly controlled gene expression program underpins its specialized function in retinal circuitry. ## Key Characteristics and Function The molecular signature of the [starburst amacrine cell](/details-cell/CL0004232) reveals several key functional axes that maintain its unique phenotype and role in neurotransmission. * **Transcriptional and Post-Transcriptional Regulation:** A dominant theme among the top markers is the regulation of gene expression. The most specific marker, [MSI2](/details-gene/124540) (CSI 12.04), is an RNA-binding protein. Its prominence, alongside other regulators like the splicing factor [SRRM4](/details-gene/84530) and the P-body component [TNRC6B](/details-gene/23112), suggests that RNA processing is a critical control layer. This is complemented by a suite of specific chromatin and transcriptional regulators, including [ARID1B](/details-gene/57492), [ZNF292](/details-gene/23036), [KMT2C](/details-gene/58508), and [KANSL1](/details-gene/284058). The presence of the long non-coding RNA [XIST](/details-gene/7503) and the microRNA host gene [MIR124 2HG](/details-gene/100130155) further underscores the multi-layered regulatory complexity defining this cell type. * **Neuronal Signaling and Synaptic Function:** As expected for a neuron, several top markers are directly involved in synaptic transmission and excitability. These include the AMPA glutamate receptor subunit [GRIA4](/details-gene/2893), the voltage-gated sodium channel [SCN8A](/details-gene/6334), and the calcium sensor for neurotransmitter release, [SYT1](/details-gene/6857). The specific expression of neuregulin [NRG3](/details-gene/10718), neurexin [NRXN3](/details-gene/9369), and the potassium channel interacting protein [KCNIP4](/details-gene/80333) points to a highly specialized set of molecules for establishing and modulating its synaptic connections within the retinal plexus. * **Cell Adhesion and Development:** Genes involved in cell-cell interaction and nervous system development, such as [MDGA2](/details-gene/161357), [ADGRB3](/details-gene/577), [OPCML](/details-gene/4978), and [CSMD3](/details-gene/114788), are also defining markers. This suggests their expression is crucial for maintaining the precise laminar organization and synaptic partnerships characteristic of [starburst amacrine cells](/details-cell/CL0004232). * **Distinct Metabolic Profile:** The anti-marker list provides powerful exclusionary information. The most striking finding is the strong negative significance of numerous core components of the mitochondrial electron transport chain, including [COX2](/details-gene/4513) (CSI -5.32), [ND2](/details-gene/4536) (CSI -7.03), [ND1](/details-gene/4535) (CSI -7.53), and [ND3](/details-gene/4537) (CSI -7.87). This pattern strongly suggests that, relative to other cells in its environment, the [starburst amacrine cell](/details-cell/CL0004232) may have a lower reliance on oxidative phosphorylation for its energy needs. Additionally, the low significance scores for genes involved in ubiquitous processes like actin dynamics ([CFL1](/details-gene/1072)) and cellular stress response ([HIF1A](/details-gene/3091)) reinforces the idea of a highly specialized and terminally differentiated state. ## Clinical Significance and Contextual Roles While this analysis is based on an **Overall** context without a direct disease comparison, the specific gene markers for [starburst amacrine cells](/details-cell/CL0004232) are themselves implicated in a range of human diseases, suggesting potential vulnerabilities or functional connections. The top marker, [MSI2](/details-gene/124540), is known to be a proto-oncogene whose misexpression is linked to poor prognosis in chronic myeloid leukemia ([Link](https://pubmed.ncbi.nlm.nih.gov/12649177/)). The second most specific marker, [ARID1B](/details-gene/57492), is a subunit of the SWI/SNF chromatin remodeling complex, and mutations in this gene are a leading cause of Coffin-Siris syndrome, a neurodevelopmental disorder characterized by intellectual disability. Similarly, mutations in the sodium channel gene [SCN8A](/details-gene/6334) are associated with epileptic encephalopathy. The specific enrichment of these disease-associated genes in [starburst amacrine cells](/details-cell/CL0004232) suggests that dysfunction of this particular cell type could potentially contribute to the pathophysiology of certain retinopathies or neurodevelopmental disorders, although direct evidence is lacking. The absence of a comparative disease context in this dataset precludes definitive conclusions about how this cell's role might change during pathology. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The functional identity of the [starburst amacrine cell](/details-cell/CL0004232) is primarily established and maintained through a robust network of post-transcriptional regulators, which fine-tunes the expression of a stable, pre-determined set of synaptic and structural proteins. * **Surprising Findings:** The dominance of RNA-binding proteins ([MSI2](/details-gene/124540), [SRRM4](/details-gene/84530)), ncRNAs ([XIST](/details-gene/7503), [MIR124 2HG](/details-gene/100130155)), and chromatin modifiers ([ARID1B](/details-gene/57492)) as the most specific markers is notable. It implies that the uniqueness of this cell lies less in the expression of entirely novel proteins and more in the precise quantitative and spatial control of a specific neuronal gene program. * **Testable Questions:** Does selective depletion of [MSI2](/details-gene/124540) in the developing retina disrupt the formation of the characteristic dendritic arbors of [starburst amacrine cells](/details-cell/CL0004232)? Furthermore, does CLIP-seq analysis of MSI2 in these cells reveal binding to the mRNAs of other key markers like [GRIA4](/details-gene/2893) or [SYT1](/details-gene/6857)? 2. **Hypothesis:** [Starburst amacrine cells](/details-cell/CL0004232) possess a distinct metabolic specialization characterized by a lower dependence on mitochondrial oxidative phosphorylation and a potential preference for glycolysis compared to other retinal neurons. * **Surprising Findings:** The coordinated and strong negative significance of multiple essential mitochondrial genes ([ND1](/details-gene/4535), [ND2](/details-gene/4536), [ND3](/details-gene/4537), [COX2](/details-gene/4513), [COX3](/details-gene/4514), [ATP6](/details-gene/4508)) is highly unexpected for a neuron, a cell type typically viewed as having high energy demands. This suggests a unique bioenergetic adaptation, which may be linked to its specific role in phasic versus tonic signaling in the retinal circuit. * **Testable Questions:** Do direct measurements of oxygen consumption and lactate production in isolated [starburst amacrine cells](/details-cell/CL0004232) confirm a lower oxidative-to-glycolytic flux ratio compared to retinal ganglion cells or photoreceptors? Could this metabolic state render them selectively vulnerable or resistant to pathologies involving mitochondrial dysfunction?