Details for: CL0000065

Cell ID: CL0000065

Cell Name: ependymal cell

Description: A neuroepithelial glial cell, derived from a radial glial cell originating from the neuroectoderm, lines the ventricles of the brain and the central canal of the spinal cord. This cell is characterized by the presence of cilia on its apical surface, which can be motile or non-motile.

Synonyms: ependymocyte

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 ependymal 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 ependymal 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 ependymal 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 ependymal 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:  ependymal cell (CL0000065)

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Nodes (Genes):
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Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
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 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 [ependymal cell](/details-cell/CL0000065), or ependymocyte, is a neuroepithelial glial cell that lines the ventricles of the brain and the central canal of the spinal cord. Based on its gene significance profile, this cell type is not merely a structural barrier but appears to function as a highly specialized hub for RNA processing and a modulator of the periventricular environment. The high specificity scores for DEAD-box helicases like [DDX17](/details-gene/10521) and [DDX5](/details-gene/1655), alongside the long non-coding RNA [NEAT1](/details-gene/283131), suggest a primary role in regulating alternative mRNA splicing and nuclear architecture. This is complemented by markers related to ciliary function, such as [ARMC3](/details-gene/219681), and genes involved in neuronal signaling, pointing to a complex, multifaceted role in central nervous system homeostasis. ## Key Characteristics and Function **Overall**, the gene expression profile of the [ependymal cell](/details-cell/CL0000065) highlights three core functional axes: specialized nuclear regulation, ciliary-mediated fluid dynamics, and interaction with the neuronal microenvironment. * **Specialized RNA Processing and Nuclear Organization:** The most prominent characteristic is the highly specific expression of genes involved in RNA metabolism. The top marker, [DDX17](/details-gene/10521) (CSI: 45.33), along with [DDX5](/details-gene/1655), are DEAD-box RNA helicases critical for alternative mRNA splicing. Their dominance suggests that ependymal cells possess a unique capacity to post-transcriptionally regulate gene expression. This is strongly supported by the high significance of [NEAT1](/details-gene/283131), a key structural component of nuclear paraspeckles, which are involved in mRNA retention and regulation. The presence of these specific factors, contrasted with the negative significance of more ubiquitous RNA-binding proteins like [HNRNPA1](/details-gene/3178) (CSI: -26.77) and [YBX1](/details-gene/4904) (CSI: -33.81), implies a highly tailored, rather than a general, RNA processing machinery. * **Ciliary Function and Motility:** Consistent with their known morphology, ependymal cells show specific expression of genes associated with motile structures. [ARMC3](/details-gene/219681), whose function is linked to flagellated sperm motility, and [ROPN1L](/details-gene/83853), involved in epithelial cilium movement, are significant markers. This molecular signature directly supports the role of ependymal cilia in propelling cerebrospinal fluid (CSF) through the ventricular system, a process vital for waste clearance, nutrient transport, and intracranial pressure regulation. * **Neurotransmitter Signaling and Axonal Guidance:** A surprising feature of this cell type is the specific expression of genes typically associated with neuronal function. Markers for GABAergic signaling, including the GABA-A receptor subunit [GABRG3](/details-gene/2567) and the GABA-synthesizing enzyme [GAD2](/details-gene/2572), suggest that ependymal cells may be responsive to, or even participate in, inhibitory neurotransmission at the brain-CSF interface. Furthermore, the expression of synaptic vesicle-associated proteins like [SYNPR](/details-gene/132204) and [SYN2](/details-gene/6854) reinforces a potential role in neuro-signaling. The high specificity of [RTN4](/details-gene/57142), an inhibitor of neurite outgrowth, suggests ependymal cells help form a non-permissive boundary that prevents aberrant axonal growth into the ventricles. * **Cellular Identity Defined by Absence of Markers:** The anti-marker profile further refines the functional identity of the [ependymal cell](/details-cell/CL0000065). The low significance of [B2M](/details-gene/567) (CSI: -7.49) may indicate reduced MHC class I antigen presentation, potentially contributing to the immune-privileged status of the CNS. Additionally, the negative scores for genes involved in general iron homeostasis ([FTH1](/details-gene/2495)) and mitochondrial respiration ([COX1](/details-gene/4512), [COX3](/details-gene/4514)) distinguish the metabolic state of ependymal cells from more metabolically active cell types like neurons or oligodendrocytes. ## Clinical Significance and Contextual Roles While the current data is from an **Overall** context, the specific gene markers of [ependymal cells](/details-cell/CL0000065) have direct implications for neurological health and disease. The expression of [CST3](/details-gene/1471) (cystatin C) is clinically significant, as mutations in this gene are linked to hereditary cerebral amyloid angiopathy, a condition causing stroke and dementia ([Link](https://pubmed.ncbi.nlm.nih.gov/2541223/)). Its specific expression in ependymal cells suggests this cell type could play a role in the pathogenesis of diseases involving protein aggregation and clearance from the CSF. The presence of [GAD2](/details-gene/2572), an autoantigen in type 1 diabetes and stiff-person syndrome, suggests ependymal cells could be a potential target in autoimmune neurological disorders. Furthermore, the high specificity of [RTN4](/details-gene/57142) (Nogo) is highly relevant to neural repair. As a potent inhibitor of axonal regeneration, its expression by ependymal cells may contribute to the poor regenerative capacity of the CNS after injury, particularly in periventricular regions. Therapies targeting [RTN4](/details-gene/57142) are an active area of research for spinal cord and brain injury. The prominent role of RNA processing machinery ([DDX17](/details-gene/10521), [DDX5](/details-gene/1655)) and the paraspeckle component [NEAT1](/details-gene/283131) may be significant in the context of neurodevelopmental and neurodegenerative disorders where aberrant RNA splicing is a known pathogenic mechanism. Dysregulation of these pathways in ependymal cells could disrupt CSF dynamics, impair waste clearance, or alter signaling to adjacent neural stem cells in the subventricular zone. ## Potential Mechanisms and Research Directions 1. **Hypothesis: Ependymal cells act as key post-transcriptional regulators of the periventricular niche via specialized RNA splicing.** * **Surprising Findings:** The dominance of specific RNA helicases like [DDX17](/details-gene/10521) and [DDX5](/details-gene/1655), as well as the lncRNA [NEAT1](/details-gene/283131), as identity markers suggests their function in these cells is not redundant but highly specialized. This specificity implies a crucial role in maintaining cellular homeostasis or responding to environmental cues through controlled alternative splicing. * **Testable Questions:** Does conditional knockout of [DDX17](/details-gene/10521) in ependymal cells alter the splicing patterns of secreted proteins found in the CSF, and does this impact the behavior of nearby neural stem cells in the subventricular zone? 2. **Hypothesis: Ependymal cells function as non-canonical participants in GABAergic signaling, sensing and shaping the neurochemical environment of the CSF.** * **Surprising Findings:** The co-expression of a GABA synthesis enzyme ([GAD2](/details-gene/2572)), a GABA receptor subunit ([GABRG3](/details-gene/2567)), and synaptic vesicle proteins ([SYNPR](/details-gene/132204), [SYN2](/details-gene/6854)) in a glial cell type is unexpected and points towards a previously unappreciated role in neurotransmission. * **Testable Questions:** Using calcium imaging or patch-clamp electrophysiology, can ependymal cells be shown to respond to GABA application? Conversely, can they release GABA in response to physiological stimuli, such as changes in CSF pressure or exposure to other neurotransmitters?