Details for: CL0000700

Cell ID: CL0000700

Cell Name: dopaminergic neuron

Description: A neuron that releases dopamine as a neurotransmitter.

Synonyms: dopaminergic cell

Selected Context(s): Overall

Gene Significance Landscape

Display Options
Score:
Display
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 dopaminergic 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 dopaminergic 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 dopaminergic 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 dopaminergic 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:  dopaminergic neuron (CL0000700)

 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 [dopaminergic neuron](/details-cell/CL0000700) is a specialized neuron that utilizes dopamine as its primary neurotransmitter. Based on its gene significance profile, this cell type is characterized by a highly specific repertoire of proteins involved in synaptic transmission, cell-cell adhesion, and signal reception. The prominent expression of genes such as the glutamate receptor [GRM5](/details-gene/2915) and the cell adhesion molecule [CSMD3](/details-gene/114788) suggests that its identity and function are defined not just by dopamine release, but by its precise integration into complex neural circuits through a unique set of surface receptors and structural proteins. ## Key Characteristics and Function **Overall**, the molecular signature of the [dopaminergic neuron](/details-cell/CL0000700) points to a cell that is intricately involved in modulating and responding to complex neural signals, while maintaining a highly stable structural and synaptic architecture. * **Synaptic Signaling and Ion Channel Activity:** A primary functional theme is the cell's role in neurotransmission. There is a high specificity score for multiple neurotransmitter receptors, including the metabotropic glutamate receptor [GRM5](/details-gene/2915) ([Link](https://doi.org/10.1006/bbrc.1994.1349)), the AMPA receptor subunit [GRIA4](/details-gene/2893), and GABA-A receptor subunits [GABRB1](/details-gene/2560) and [GABRG3](/details-gene/2567). This indicates that [dopaminergic neurons](/details-cell/CL0000700) are not merely output cells but are themselves under tight regulation by both excitatory and inhibitory systems. This is further supported by the specific expression of various ion channels critical for neuronal excitability, such as the N-type voltage-gated calcium channel [CACNA1B](/details-gene/774) ([Link](https://doi.org/10.1126/science.1321501)) and the hyperpolarization-activated channel [HCN1](/details-gene/348980). * **Cell Adhesion and Neuronal Circuitry:** A striking feature is the highly specific expression of a large number of cell adhesion and guidance molecules. Members of the CUB and Sushi multiple domains family, including [CSMD3](/details-gene/114788), [CSMD1](/details-gene/64478), and [CSMD2](/details-gene/114784), are exceptionally strong markers. Similarly, protocadherins ([PCDHAC2](/details-gene/56134), [PCDHGB5](/details-gene/56101)) and other adhesion molecules like [DSCAM](/details-gene/1826) and [OPCML](/details-gene/4978) show high specificity. This collective signature suggests that the precise wiring, dendritic organization, and synaptic targeting of [dopaminergic neurons](/details-cell/CL0000700) are governed by a complex and unique molecular code. * **Intracellular Signaling Cascades:** Key intracellular signaling components are also defining markers. [RIT2](/details-gene/6014), a Ras-like small GTPase involved in the MAPK cascade ([Link](https://doi.org/10.1523/jneurosci.16-21-06784.1996)), and [NRG3](/details-gene/10718), a ligand for ErbB4 receptor tyrosine kinases ([Link](https://doi.org/10.1073/pnas.94.18.9562)), are highly specific. This points to the importance of specific neurotrophic and signaling pathways in maintaining the function and survival of these neurons. * **Suppressed Housekeeping Functions:** The anti-marker profile is equally informative. The strong negative specificity scores for genes involved in ubiquitous cellular processes, such as glycolysis ([GAPDH](/details-gene/2597)), mitochondrial respiration ([ATP6](/details-gene/4508), [COX3](/details-gene/4514), [ND5](/details-gene/4540)), and general RNA processing/splicing ([DDX5](/details-gene/1655), [HNRNPA2B1](/details-gene/3181), [SRSF5](/details-gene/6430)), suggest that these fundamental processes, while active, are not uniquely defining features of this cell type. The down-regulation of multiple splicing factors may indicate a reliance on a stable, pre-defined set of transcripts rather than dynamic alternative splicing to maintain its specialized state. Similarly, the low specificity of actin-cytoskeleton modulator [CFL1](/details-gene/1072) may imply a highly stable cytoskeleton required for long-term maintenance of synaptic structures. ## Clinical Significance and Contextual Roles The gene signature of [dopaminergic neurons](/details-cell/CL0000700) provides insights into their potential roles in neurological and psychiatric disorders. The loss of these neurons is the primary cause of Parkinson's disease, and their dysregulation is implicated in schizophrenia, addiction, and depression. The high specificity of genes with known links to neurodevelopmental disorders underscores the cell's importance in brain development. For instance, [DSCAM](/details-gene/1826) is located in a Down syndrome critical region and is crucial for neural development ([Link](https://doi.org/10.1093/hmg/7.2.227)). The [CSMD1](/details-gene/64478) gene has been associated with schizophrenia and other psychiatric conditions, suggesting that disruptions in the specific connectivity of [dopaminergic neurons](/details-cell/CL0000700) could be a contributing factor. The presence of numerous ion channel genes like [CACNA1B](/details-gene/774) and [HCN1](/details-gene/348980) as specific markers suggests that channelopathies affecting these components could selectively impair dopaminergic circuits. The reliance on specific signaling pathways, marked by [RIT2](/details-gene/6014) and [NRG3](/details-gene/10718), highlights potential vulnerabilities, where disruption of these pathways could lead to neuronal dysfunction or degeneration. ## Potential Mechanisms and Research Directions 1. **Hypothesis: The "Synaptic Barcode" Governs Dopaminergic Circuit Assembly.** The exceptionally high specificity of a large suite of cell adhesion molecules, particularly from the [CSMD](/details-gene/64478) and Protocadherin families, suggests they form a combinatorial "barcode" that dictates the precise synaptic partnerships of [dopaminergic neurons](/details-cell/CL0000700). This molecular identity may be critical for establishing their distinct projections to brain regions like the striatum and prefrontal cortex, and its subtle disruption could be a primary etiology for neurodevelopmental disorders like schizophrenia or autism. * **Surprising Findings:** The dominance of these specific, large, and complex adhesion molecules ([CSMD1](/details-gene/64478), [CSMD3](/details-gene/114788)) over more canonical synaptic adhesion proteins is noteworthy. It suggests their function extends beyond simple adhesion to active roles in synapse organization and signaling. * **Testable Questions:** Does selective ablation of [CSMD1](/details-gene/64478) in developing [dopaminergic neurons](/details-cell/CL0000700) result in mis-targeting of their axons or an altered number of synapses in target regions? Can super-resolution microscopy reveal a specific localization of these proteins at dopaminergic synapses? 2. **Hypothesis: Transcriptional and Cytoskeletal Rigidity Confers Stability at the Cost of Plasticity.** The strong negative enrichment for numerous core RNA processing factors ([DDX5](/details-gene/1655), [DDX17](/details-gene/10521), [HNRNPA2B1](/details-gene/3181)) and the key actin-remodeling protein [CFL1](/details-gene/1072) suggests that [dopaminergic neurons](/details-cell/CL0000700) maintain their identity through a state of reduced transcriptional and cytoskeletal dynamism. This "rigidity" could be a mechanism to ensure the long-term stability of their extensive axonal arbors and synaptic connections over a lifetime, but it may also render them uniquely vulnerable to stressors that require a rapid adaptive response, potentially contributing to their selective degeneration in diseases like Parkinson's. * **Surprising Findings:** It is highly unusual for a cell's identity to be strongly defined by the *lack* of specificity for such fundamental machinery. This points towards a specialized cellular strategy that prioritizes stability over the plasticity common in other cell types. * **Testable Questions:** Does single-cell transcriptomic analysis show a lower diversity of mRNA isoforms in [dopaminergic neurons](/details-cell/CL0000700) compared to other cortical [neurons](/details-cell/CL0000540)? Are actin turnover rates at dendritic spines of [dopaminergic neurons](/details-cell/CL0000700) significantly lower than in neighboring cells, and does inhibiting RNA splicing or actin dynamics disproportionately affect their survival under oxidative stress?