Details for: CL0002605

Cell ID: CL0002605

Cell Name: astrocyte of the cerebral cortex

Description: A transcriptomically distinct astrocyte that is found in the cerebral cortex.

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 astrocyte of the cerebral cortex 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 astrocyte of the cerebral cortex. 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 astrocyte of the cerebral cortex. 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 astrocyte of the cerebral cortex. 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:  astrocyte of the cerebral cortex (CL0002605)

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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 [astrocyte of the cerebral cortex](/details-cell/CL0002605) is a specialized glial cell type essential for central nervous system homeostasis and function. Based on its transcriptomic signature, this cell is defined by the highly specific expression of genes involved in RNA processing, synaptic modulation, and calcium signaling. **Overall**, the gene significance profile highlights a cell that is not only a structural and metabolic support unit but also an active participant in regulating neural circuits through sophisticated post-transcriptional and signaling mechanisms. Key markers such as the RNA helicase [DDX17](/details-gene/10521) and the alpha-1,3-fucosyltransferase [FUT9](/details-gene/10690) underscore its unique molecular identity within the cerebral cortex. ## Key Characteristics and Function The functional profile of the [astrocyte of the cerebral cortex](/details-cell/CL0002605) is delineated by several clusters of highly specific genes. * **RNA Processing and Splicing:** A prominent characteristic of this cell is the specific expression of genes involved in RNA metabolism. The top marker, [DDX17](/details-gene/10521), is a DEAD box RNA helicase crucial for alternative mRNA splicing. This is complemented by other significant markers like [PNISR](/details-gene/25957), which interacts with spliceosome components, and [CIRBP](/details-gene/1153), a cold-inducible RNA-binding protein. Notably, [RBFOX3](/details-gene/146713) (also known as NeuN), traditionally considered a specific marker for post-mitotic neurons, shows a high Cell Significance Index (CSI). This suggests that these astrocytes may share complex RNA processing pathways with neurons, potentially to regulate a unique suite of transcripts essential for cortical function. * **Synaptic Modulation and Neurotransmitter Response:** These astrocytes are equipped to sense and respond to neuronal activity. They express high levels of genes encoding receptors for major neurotransmitters, including the glutamate receptor [GRID1](/details-gene/2894), metabotropic glutamate receptor [GRM1](/details-gene/2911), and GABA-B receptor subunit [GABBR2](/details-gene/9568). The expression of genes typically associated with synaptic vesicles, such as [SYN2](/details-gene/6854) and [SYNPR](/details-gene/132204), may indicate a role in modulating synaptic transmission or plasticity. * **Calcium Homeostasis and Signaling:** Astrocyte function is tightly linked to intracellular calcium dynamics. This is reflected in the specific expression of the plasma membrane calcium pump [ATP2B2](/details-gene/491) and the potassium-dependent sodium-calcium exchanger [SLC24A2](/details-gene/25769). Furthermore, the high significance of [CAMK2A](/details-gene/815), a key calcium-dependent kinase, reinforces the importance of calcium-mediated signaling pathways in executing this cell's functions. * **Cell Adhesion and Structural Organization:** A suite of cell adhesion molecules appears to be defining markers, highlighting the astrocyte's role in maintaining the structural integrity of the cortical tissue. These include [CSMD3](/details-gene/114788), [CNTNAP5](/details-gene/129684), [CDH18](/details-gene/1016), and [OPCML](/details-gene/4978), which likely mediate interactions with neurons and other glial cells. Conversely, the anti-marker profile is strongly defined by the significant under-representation of genes encoding components of the mitochondrial electron transport chain (e.g., [COX1](/details-gene/4512), [COX2](/details-gene/4513), [CYTB](/details-gene/4519), [ND1](/details-gene/4535), [ND2](/details-gene/4536), and [ATP6](/details-gene/4508)). This suggests that, relative to other cell types in its environment, the cortical astrocyte may rely less on oxidative phosphorylation for its energy needs, a finding consistent with its proposed role in providing lactate to neurons. The negative CSI for the developmental transcription factor [DBX2](/details-gene/440097) confirms its identity as a terminally differentiated cell type. ## Clinical Significance and Contextual Roles **Overall**, the gene profile of the [astrocyte of the cerebral cortex](/details-cell/CL0002605) points toward its critical involvement in maintaining synaptic health and its potential vulnerability in neurological disorders. The high specificity of genes like [GRM1](/details-gene/2911) and [GRID1](/details-gene/2894) implicates these cells in conditions where glutamatergic signaling is disrupted, such as epilepsy, schizophrenia, and neurodegenerative diseases. [CSMD3](/details-gene/114788) has been identified as a candidate gene for benign adult familial myoclonic epilepsy ([Link](https://pubmed.ncbi.nlm.nih.gov/12943675/)), highlighting a direct link between an astrocytic marker and a neurological channelopathy. The specific expression of numerous cell adhesion molecules suggests that disruptions in astrocyte-neuron contacts could contribute to the breakdown of neural circuits seen in various pathologies. The surprising finding of [RBFOX3](/details-gene/146713) (NeuN) as a top marker is clinically relevant. Altered subcellular localization of [RBFOX3](/details-gene/146713) has been reported in neurons from patients with HIV-associated neurocognitive disorders ([Link](https://doi.org/10.1016/j.neulet.2013.10.037)), suggesting that dysfunction of this RNA splicing factor in both neurons and potentially this specific astrocyte population could be a shared pathogenic mechanism. The distinct metabolic profile, characterized by the low expression of mitochondrial respiratory genes, implies that these cells could be particularly susceptible to metabolic insults that affect glycolysis, potentially impacting their ability to support neighboring neurons under stress. ## Potential Mechanisms and Research Directions 1. * **Hypothesis:** The highly specific expression of a suite of RNA processing factors, including the canonical neuronal marker [RBFOX3](/details-gene/146713), suggests that cortical astrocytes possess a sophisticated and perhaps neuron-like, activity-dependent splicing program that is essential for regulating their supportive functions at the synapse. This astrocytic splicing machinery may be a critical, unappreciated node in the regulation of cortical plasticity. * **Surprising Findings:** The identification of [RBFOX3](/details-gene/146713) as a top specificity marker for an astrocyte population fundamentally challenges its use as a universal neuronal marker and implies a convergence of post-transcriptional regulatory networks between these two distinct cell types in the cortex. * **Testable Questions:** Does astrocyte-specific conditional knockout of [RBFOX3](/details-gene/146713) in the cerebral cortex lead to aberrant splicing of astrocytic transcripts involved in glutamate uptake or potassium buffering, and does this result in altered synaptic transmission and behavioral deficits? 2. * **Hypothesis:** The profound and coordinated negative significance scores for numerous mitochondrial electron transport chain genes (e.g., [ND1](/details-gene/4535), [COX1](/details-gene/4512), [ATP6](/details-gene/4508)) reflect a constitutive metabolic state in cortical astrocytes that is biased away from oxidative phosphorylation. This specialization may serve to maximize their capacity for aerobic glycolysis, enabling a robust and dynamic supply of lactate to fuel surrounding neurons, particularly during high synaptic activity. * **Surprising Findings:** While the astrocyte-neuron lactate shuttle is a known hypothesis, the data suggest that a suppressed mitochondrial respiratory profile is one of the most defining negative characteristics of this cell type. This indicates that this metabolic state is not just a transient adaptation but a core feature of their identity. * **Testable Questions:** Do in vivo metabolic flux analyses using isotope-labeled glucose and glutamine reveal a significantly higher contribution to lactate production from cortical astrocytes compared to other CNS cell types, and is this metabolic phenotype compromised in mouse models of neurodegenerative diseases where astrocytic metabolic support is thought to fail?