Details for: CL0002573

Cell ID: CL0002573

Cell Name: Schwann cell

Description: A glial cell that myelinates or ensheathes axons in the peripheral nervous system.

Synonyms: neurolemmocyte

Selected Context(s): Overall

Gene Significance Landscape

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Score:
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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 Schwann 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 Schwann 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 Schwann 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 Schwann 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.
Select a context for the baseline cell.
Select a context for the target cell.
Target Cell for CSI:  Schwann cell (CL0002573)

 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 [Schwann cell](/details-cell/CL0002573) is a glial cell type of the peripheral nervous system responsible for the myelination and ensheathment of axons. The gene significance profile for this cell, analyzed in an **Overall** context, underscores its highly specialized role in neuro-glial interaction, structural support, and signaling. The high specificity scores (`csi_z`) for genes such as the neurotrophin receptor [NTRK3](/details-gene/4916), and cell-cell communication molecules like [KIRREL3](/details-gene/84623) and [LRRTM4](/details-gene/80059), are consistent with a transcriptional program dedicated to recognizing, interacting with, and maintaining neuronal axons. This profile paints a picture of a cell that is not only a structural insulator but also an active and dynamic partner in neuronal function and development. ## Key Characteristics and Function The defining characteristics of the [Schwann cell](/details-cell/CL0002573) are dominated by genes involved in cell adhesion, signaling, and cytoskeletal organization, reflecting its primary function of ensheathing and myelinating axons. * **Neuronal Interaction and Adhesion:** A prominent functional cluster of top markers involves cell-cell communication and adhesion. Genes such as [KIRREL3](/details-gene/84623), [LRRTM4](/details-gene/80059), [CDH19](/details-gene/28513), [CNTN1](/details-gene/1272), and [NRXN3](/details-gene/9369) all have exceptionally high specificity scores. These molecules, part of the immunoglobulin superfamily, leucine-rich repeat family, and cadherin family, likely form a complex molecular code on the Schwann cell surface that mediates axon recognition, adhesion, and the intricate wrapping process of myelination. The high specificity of [OPCML](/details-gene/4978) and [NTM](/details-gene/50863), both encoding GPI-anchored proteins, further suggests a specialized extracellular interface for interacting with the axonal membrane and the surrounding basal lamina. * **Receptor Signaling and Development:** The top-ranked gene, [NTRK3](/details-gene/4916), encodes a receptor for neurotrophin-3, highlighting the cell's responsiveness to neurotrophic factors essential for survival, differentiation, and myelination ([Link](https://pubmed.ncbi.nlm.nih.gov/7806211/)). The significant expression of [ADGRB3](/details-gene/577), an adhesion G protein-coupled receptor, also suggests that Schwann cells integrate mechanical and chemical cues from their environment to regulate their function. * **Cytoskeletal Dynamics:** The high specificity of microtubule-associated proteins [MAPT](/details-gene/4137) and [MAP1B](/details-gene/4131), along with the neuron navigator homolog [NAV3](/details-gene/89795), points to the critical role of cytoskeletal rearrangement. These proteins are likely essential for orchestrating the dramatic morphological changes required to extend and wrap the Schwann cell membrane around axons to form the myelin sheath. * **Immune Competence:** The specific expression of [B2M](/details-gene/567), a core component of MHC class I molecules, suggests a potential role for Schwann cells in peripheral immune surveillance. This indicates that these glial cells may have the capacity to present endogenous antigens, potentially implicating them in the pathology of inflammatory neuropathies. * **Anti-Markers and Metabolic Specialization:** The list of least significant genes is strikingly enriched for components of core metabolic pathways, particularly mitochondrial respiration ([COX4I1](/details-gene/1327), [COX7C](/details-gene/1350), [COX6A1](/details-gene/1337), [UQCRB](/details-gene/7381]) and ATP synthesis ([ATP5F1E](/details-gene/514), [ATP5MC2](/details-gene/517), [ATP6](/details-gene/4508)). This pattern does not imply an absence of these functions but indicates that the expression of these housekeeping genes is not a defining feature of Schwann cells compared to other cell types. This may suggest a specialized metabolic state or a symbiotic relationship where they rely on metabolic support from the associated axon. ## Clinical Significance and Contextual Roles Although this analysis is based on an **Overall** context without direct comparison to a disease state, the top marker genes of [Schwann cells](/details-cell/CL0002573) have significant clinical implications, particularly in peripheral neuropathies, cancer, and neurodevelopmental disorders. * **Peripheral Neuropathies and Neurodegeneration:** The high specificity of [MAPT](/details-gene/4137), which encodes the tau protein, is notable. While tau is primarily studied in central nervous system disorders like Alzheimer's disease, its specific expression here suggests a potential role for Schwann cell tau pathology in peripheral neuropathies. The fusion transcript [IQCJ SCHIP1](/details-gene/100505385) is of particular interest, as SCHIP1 (schwannomin interacting protein 1) interacts with the product of the *NF2* gene, which is mutated in neurofibromatosis type 2, a disorder characterized by the growth of schwannomas ([Link](https://pubmed.ncbi.nlm.nih.gov/17045569/)). This provides a direct molecular link between a top marker and a Schwann cell-derived tumor. * **Cancer Biology:** [NTRK3](/details-gene/4916) is a known proto-oncogene, and chromosomal rearrangements involving this gene are found in congenital fibrosarcoma and other cancers ([Link](https://pubmed.ncbi.nlm.nih.gov/9778053/)). Its status as a top defining marker for Schwann cells highlights a potential lineage connection and therapeutic target in related soft-tissue tumors. * **Ion Channelopathies:** The specific expression of ion channel components like the potassium channel-interacting protein [KCNIP4](/details-gene/80333) and the hyperpolarization-activated channel [HCN1](/details-gene/348980) suggests that dysfunction in these genes could contribute to peripheral nerve hyperexcitability or conduction deficits by altering the electrical properties of the axon-glia interface. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The specific combination of numerous cell adhesion molecules ([KIRREL3](/details-gene/84623), [LRRTM4](/details-gene/80059), [CNTN1](/details-gene/1272), [CDH19](/details-gene/28513)) and signaling receptors ([NTRK3](/details-gene/4916), [ADGRB3](/details-gene/577)) on the Schwann cell surface forms a combinatorial "adhesion code" that not only mediates axon recognition but also actively instructs the initiation and extent of myelination for specific axon calibers. * **Surprising Findings:** The sheer diversity and high specificity of adhesion and signaling molecules expressed by Schwann cells suggest a far more complex and regulated system of axon interaction than simple ensheathment. The high rank of [LRRTM4](/details-gene/80059), a synaptogenic protein typically studied at the neuronal synapse, suggests a potential "pseudo-synaptic" functional relationship between the Schwann cell and the axon it myelinates. * **Testable Questions:** Does a CRISPR-based knockout screen of the top 10 adhesion-related genes in a human iPSC-derived Schwann cell/neuron co-culture model reveal specific requirements for individual molecules in axon sorting versus myelination wrapping? 2. **Hypothesis:** Schwann cells exhibit a specialized metabolic state, characterized by a relative downregulation of their own mitochondrial oxidative phosphorylation machinery (as suggested by the anti-marker profile), and engage in a metabolic symbiosis with their associated axons, potentially providing metabolites like lactate while relying on the neuron for other substrates. * **Surprising Findings:** It is counterintuitive that a cell performing the energetically demanding process of producing and maintaining vast amounts of membrane for the myelin sheath would not be defined by high expression of mitochondrial respiratory chain components. This strongly suggests an alternative metabolic strategy is a core feature of its identity. * **Testable Questions:** Using stable isotope tracing (e.g., 13C-glucose) in an ex vivo dorsal root ganglia culture, can we demonstrate a net transfer of lactate or other metabolic intermediates from Schwann cells to axons, and does inhibiting this transfer with specific transporters impair axonal health or myelin maintenance?