Details for: CL0001031

Cell ID: CL0001031

Cell Name: cerebellar granule cell

Description: An excitatory granule cell with a soma located in the granular layer of cerebellar cortex. A mature cerebellar granule cell has short dendrites with a characteristic claw-like appearance and a long axon that ascends to the molecular layer where it bifurcates (except in non-teleost fish, where it does not bifurcate) and extends mediolaterally to form parallel fibers.

Synonyms: granule cell of the cerebellum

Selected Context(s): Overall

Gene Significance Landscape

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Cell Significance Index (CSI) is uniquely calculated to reveal cell-specific gene markers. More info here

Image representation

Depiction of cerebellar granule cell
Courtesy of SwissBioPics

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for cerebellar granule 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 cerebellar granule 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 cerebellar granule 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 cerebellar granule 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.
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Select a context for the target cell.
Target Cell for CSI:  cerebellar granule cell (CL0001031)

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Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
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 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 [cerebellar granule cell](/details-cell/CL0001031) is an excitatory neuron located in the granular layer of the cerebellar cortex, characterized by a small soma and a distinct axon that bifurcates to form parallel fibers. **Overall**, the gene significance profile highlights this cell as a highly specialized computational unit defined by a unique repertoire of ion channels, neurotransmitter receptors, and calcium signaling proteins. The high specificity scores (`csi_z`) for genes like the sodium channel subunit [SCN2A](/details-gene/6326) and the potassium channel interacting protein [KCNIP4](/details-gene/80333) underscore its fundamental role in regulating high-frequency neuronal firing, a key feature for its function in motor control and learning. ## Key Characteristics and Function The identity of the [cerebellar granule cell](/details-cell/CL0001031) is defined by several functionally cohesive groups of genes with high expression specificity. * **Neuronal Excitability and Ion Homeostasis:** A prominent signature of this cell type is the expression of a specific suite of ion channel and transporter genes. This includes voltage-gated sodium ([SCN2A](/details-gene/6326)), potassium ([KCNIP4](/details-gene/80333), [KCND2](/details-gene/3751)), and calcium ([CACNA1A](/details-gene/773)) channels. The co-expression of these genes is consistent with the cell's capacity for generating and propagating action potentials. Furthermore, the high specificity of calcium pumps like [ATP2B2](/details-gene/491) and the sodium/potassium-transporting ATPase interactor [NKAIN2](/details-gene/154215) points towards sophisticated mechanisms for maintaining steep ionic gradients essential for sustained neuronal activity. * **Synaptic Transmission and Integration:** [Cerebellar granule cells](/details-cell/CL0001031) express a rich array of neurotransmitter receptor subunits, positioning them as key sites of signal integration. The profile includes high specificity for both ionotropic glutamate ([GRIA4](/details-gene/2893), [GRIN2A](/details-gene/2903)) and metabotropic glutamate ([GRM1](/details-gene/2911)) receptors, reflecting their primary excitatory input from mossy fibers. Notably, the GABA-A receptor subunit [GABRB2](/details-gene/2561) is also a top marker, consistent with the inhibitory input these cells receive from Golgi cells. The presence of [SYNPR](/details-gene/132204), a synaptic vesicle protein, further supports their role in active synaptic communication. * **Intracellular Signaling and Structural Integrity:** The functional machinery of these cells is supported by specific intracellular signaling and structural proteins. [CALM1](/details-gene/801), a key calcium sensor, and [RIT2](/details-gene/6014), a calmodulin-binding GTPase, highlight the importance of calcium-mediated signaling cascades. The high specificity of the kinesin motor protein [KIF5C](/details-gene/3800) is consistent with the need for active transport along its long parallel fiber axon. Cell adhesion molecules, including [CDH18](/details-gene/1016) and the opioid-binding molecule [OPCML](/details-gene/4978), suggest specific mechanisms for establishing and maintaining synaptic connections within the cerebellar circuitry. * **Transcriptional and Post-transcriptional Regulation:** The cell's neuronal identity is maintained by transcription factors such as [MYT1L](/details-gene/23040) and the RNA-binding protein [RBFOX3](/details-gene/146713) (NeuN), a classic marker for mature neurons. **Overall**, the anti-marker profile confirms the cell's specialized neuronal identity. The low significance of genes associated with mitochondrial energy metabolism (e.g., [CYTB](/details-gene/4519), [COX1](/details-gene/4512), [COX3](/details-gene/4514)) does not imply low metabolic activity, but rather that their expression is not a unique or defining feature compared to other cell types. Similarly, the very low specificity scores for immune-related genes such as [B2M](/details-gene/567) and ferritin subunits ([FTH1](/details-gene/2495), [FTL](/details-gene/2512)) clearly delineates this cell from glial or immune cell lineages. ## Clinical Significance and Contextual Roles Several of the top marker genes for [cerebellar granule cells](/details-cell/CL0001031) are implicated in neurological disorders, highlighting the cell's potential vulnerability in disease. * **Channelopathies:** Mutations in key ion channel genes are linked to severe neurological conditions. For instance, mutations in [CACNA1A](/details-gene/773) are known to cause familial hemiplegic migraine and episodic ataxia type-2 ([Link](https://pubmed.ncbi.nlm.nih.gov/8898206/)). Similarly, variants in [SCN2A](/details-gene/6326) are associated with a spectrum of epilepsy and neurodevelopmental disorders. The high specificity of these genes in granule cells suggests that dysfunction of these cells could be a primary contributor to the pathophysiology of these conditions. * **Neurodegeneration and Neurocognitive Disorders:** The high specificity of [RBFOX3](/details-gene/146713) (NeuN) is significant, as its altered subcellular localization has been observed in HIV-associated neurocognitive disorders, suggesting that granule cell health may be compromised in this context ([Link](https://doi.org/10.1016/j.neulet.2013.10.037)). The axon guidance and regeneration inhibitor [RTN4](/details-gene/57142) (Nogo) is also a specific marker, implicating these cells in processes of neural repair and plasticity following injury. * **Synaptic and Adhesion Molecules:** The opioid-binding cell adhesion molecule [OPCML](/details-gene/4978) is a tumor suppressor in several cancers, but its specific, high-level expression in [cerebellar granule cells](/details-cell/CL0001031) points to a primary role in neural circuit formation and stability, the disruption of which could contribute to developmental or degenerative disorders of the cerebellum. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The co-expression of a specific GABA-A receptor subunit ([GABRB2](/details-gene/2561)) as a top defining marker, alongside a full complement of glutamate receptors ([GRIA4](/details-gene/2893), [GRIN2A](/details-gene/2903), [GRM1](/details-gene/2911)), suggests that [cerebellar granule cells](/details-cell/CL0001031) are not simple excitatory relays but act as sophisticated logic gates where feedforward inhibition precisely gates the flow of sensory information to Purkinje cells, a process critical for temporal pattern separation in motor learning. * **Surprising Findings:** It is notable that a component of inhibitory signaling, [GABRB2](/details-gene/2561), has a specificity score (`csi_z` = 46.30) comparable to that of major excitatory glutamate receptors like [GRIA4](/details-gene/2893) (`csi_z` = 47.86). This suggests that the nature of inhibitory regulation is as uniquely defining for this cell type as its primary excitatory function. * **Testable Questions:** Using patch-clamp electrophysiology and optogenetic stimulation of Golgi cells, how does shRNA-mediated knockdown of [GABRB2](/details-gene/2561) in [cerebellar granule cells](/details-cell/CL0001031) alter their integration window and firing response to simulated mossy fiber inputs of varying frequencies? 2. **Hypothesis:** The high specificity of the opioid-binding cell adhesion molecule [OPCML](/details-gene/4978) indicates a critical, non-canonical role in structuring the granule cell microenvironment, possibly by mediating cell-cell adhesion or acting as a co-receptor that modulates synaptic plasticity at the parallel fiber-Purkinje cell synapse in response to neuropeptides or other signaling molecules. * **Surprising Findings:** The identification of a gene linked to opioid binding as one of the most specific markers for this cell type is unexpected. While the cerebellum is not a primary site for the analgesic effects of opioids, this finding suggests a potential endogenous signaling system that may fine-tune cerebellar circuitry and learning, independent of classical neurotransmission. * **Testable Questions:** Does conditional knockout of [OPCML](/details-gene/4978) in [cerebellar granule cells](/details-cell/CL0001031) lead to observable defects in the morphology of parallel fiber synapses onto Purkinje cells or impair the acquisition of cerebellum-dependent motor tasks in mouse models?