Details for: CL0000540

Cell ID: CL0000540

Cell Name: neuron

Description: These cells are also reportedly CD4-negative and CD200-positive. They are also capable of producing CD40L and IFN-gamma.

Synonyms: nerve 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

Image representation

Depiction of neuron
Courtesy of SwissBioPics

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for 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 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 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 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:  neuron (CL0000540)

 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 The [neuron](/details-cell/CL0000540), or nerve cell, is a fundamental unit of the nervous system, characterized by its electrical excitability and specialized structure for transmitting information through electrical and chemical signals. **Overall**, the gene significance profile underscores this identity, with top-ranking markers overwhelmingly related to ion channel function, synaptic transmission, and neurite structure. The high specificity score ([CSI Z-SCORE](/glossary/csi_z)) for genes like [RTN4](/details-gene/57142), a potent inhibitor of neurite outgrowth, suggests that the mature neuronal phenotype is defined not only by its active signaling capacity but also by the active maintenance of a stable, terminally differentiated state. ## Key Characteristics and Function The molecular signature of the [neuron](/details-cell/CL0000540) is dominated by genes essential for its core electrochemical functions. These can be grouped into several key functional clusters: * **Ion Channel Activity and Electrical Excitability:** A defining feature of neurons is their ability to generate action potentials. This is strongly supported by the high specificity of various voltage-gated ion channel genes. These include a sodium channel ([SCN2A](/details-gene/6326)), a calcium channel ([CACNA1B](/details-gene/774)), a potassium channel regulator ([KCNIP4](/details-gene/80333)), and a "pacemaker" channel ([HCN1](/details-gene/348980)). Together, these genes form the basis for neuronal excitability, membrane potential regulation, and signal propagation. * **Synaptic Transmission and Neurotransmitter Response:** The data highlights a profound specialization for both excitatory and inhibitory neurotransmission. The high significance of the metabotropic glutamate receptor [GRM5](/details-gene/2915) points to a crucial role in modulating excitatory signaling pathways. Concurrently, the prominence of GABA-A receptor subunits [GABRB1](/details-gene/2560) and [GABRB2](/details-gene/2561) establishes the cell's capacity for rapid inhibitory response. Genes involved in synaptic structure and vesicle priming, such as [ERC2](/details-gene/26059) and [LRRTM3](/details-gene/347731), further confirm the cell's identity as a primary node for chemical communication. * **Axonal and Dendritic Maintenance:** The structural integrity and guidance of neuronal processes are central to its function. The top marker, [RTN4](/details-gene/57142), is a well-characterized inhibitor of neurite outgrowth, suggesting its role in stabilizing mature neuronal circuits and preventing aberrant sprouting ([Link](https://doi.org/10.1038/35000287)). Other significant genes in this category include the cytoskeletal protein [SPTBN1](/details-gene/6711), the dendritic development regulator [CSMD3](/details-gene/114788), and the kinesin motor protein [KIF5C](/details-gene/3800), which is critical for intracellular transport along microtubules. * **Cell Adhesion and Extracellular Matrix Interaction:** Neurons rely on specific adhesion molecules to form and maintain synaptic connections. The high specificity of [TNR](/details-gene/7143) (Tenascin-R), an extracellular matrix protein, and the opioid-binding cell adhesion molecule [OPCML](/details-gene/4978) indicates their importance in mediating cell-cell and cell-matrix interactions within the nervous system. **Conversely**, the anti-marker profile is informative. The very low specificity scores for numerous mitochondrial genes involved in oxidative phosphorylation (e.g., [ND1](/details-gene/4535), [ND2](/details-gene/4536), [ND5](/details-gene/4540), [COX3](/details-gene/4514)) are notable. This does not imply low activity, as neurons are highly metabolically active. Instead, it suggests that the expression of these core metabolic genes is not unique to neurons and is shared ubiquitously across many cell types, making them poor *specific* markers. ## Clinical Significance and Contextual Roles The top defining genes for the [neuron](/details-cell/CL0000540) are frequently implicated in a wide range of neurological and psychiatric disorders. This underscores the cell's central role in the pathophysiology of the nervous system. * **Channelopathies:** Mutations in ion channel genes, or "channelopathies," are a major cause of neurological disease. For example, variants in [SCN2A](/details-gene/6326) are linked to severe epileptic encephalopathies and autism spectrum disorders. Similarly, dysregulation of [CACNA1B](/details-gene/774) and [HCN1](/details-gene/348980) has been associated with epilepsy and other excitability disorders. * **Neurodegenerative and Neuropsychiatric Disorders:** The glutamate receptor [GRM5](/details-gene/2915) is a key therapeutic target for conditions like Fragile X syndrome, depression, and anxiety. The neuregulin [NRG3](/details-gene/10718), another top marker, is a known risk gene for schizophrenia, implicating neuronal signaling pathways in the etiology of psychosis. * **Neural Injury and Repair:** The most specific marker, [RTN4](/details-gene/57142) (also known as Nogo-A), is a critical factor limiting axonal regeneration following injury to the central nervous system. Its high specificity highlights a fundamental challenge in clinical neurology, where the intrinsic mechanisms that stabilize mature circuits also prevent their repair. The transcription factor [MYT1L](/details-gene/23040) is also significant; its disruption is linked to a syndrome of intellectual disability and obesity, highlighting the importance of transcriptional regulation in maintaining long-term neuronal health and function. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The core identity of a mature [neuron](/details-cell/CL0000540) is defined by an active transcriptional state that simultaneously promotes electrochemical signaling while actively suppressing structural plasticity. This dual mandate creates a stable but vulnerable system, prone to failure when either signaling or structural integrity is compromised. * **Surprising Findings:** The single most specific gene for this cell type, [RTN4](/details-gene/57142), is an *inhibitor* of growth. This suggests that preventing structural change is as fundamental to the neuronal identity as transmitting signals. * **Testable Questions:** Does the targeted inhibition of [RTN4](/details-gene/57142) in a healthy, mature nervous system induce spontaneous, non-pathological synaptic remodeling, or is its function strictly limited to a post-injury regenerative block? 2. **Hypothesis:** The precise balance between excitatory ([GRM5](/details-gene/2915)) and inhibitory ([GABRB1](/details-gene/2560), [GABRB2](/details-gene/2561)) signaling components is a critical determinant of neuronal function and a primary locus of pathology. The high specificity of key components from both systems indicates that their coordinated expression is essential for establishing the neuronal phenotype. * **Surprising Findings:** The data does not prioritize excitatory over inhibitory machinery, or vice-versa. Instead, it suggests both are equally specific and fundamental to the cell's identity, highlighting the importance of integrated signal processing. * **Testable Questions:** Using single-cell spatial transcriptomics, can we identify distinct neuronal subtypes defined by the stoichiometric ratios of [GRM5](/details-gene/2915) to [GABRB1](/details-gene/2560)/[GABRB2](/details-gene/2561) transcripts, and do these ratios correlate with regional susceptibility to excitotoxicity or seizure activity?