Details for: CL0000079

Cell ID: CL0000079

Cell Name: stratified epithelial cell

Description: An epithelial cell, organized into multiple layers, with only the basal layer being in contact with the basement membrane.

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

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for stratified epithelial 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 stratified epithelial 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 stratified epithelial 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 stratified epithelial 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:  stratified epithelial cell (CL0000079)

 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.

Loading network (please wait)...

## Summary The [stratified epithelial cell](/details-cell/CL0000079) is a fundamental component of barrier tissues, characterized by its organization into multiple layers where only the basal layer contacts the basement membrane. The gene significance profile suggests this cell type is not merely a passive structural barrier but an active participant in tissue homeostasis, immune surveillance, and intercellular communication. **Overall**, the high specificity scores ([csi_z](/details-glossary/csi_z)) for genes involved in antigen presentation ([B2M](/details-gene/567)), protein synthesis ([TPT1](/details-gene/7178)), and polyamine metabolism ([SAT1](/details-gene/6303)) highlight a cell that is both structurally robust and metabolically prepared for rapid responses to environmental cues. ## Key Characteristics and Function Analysis of the top defining markers reveals several core functional clusters that characterize the [stratified epithelial cell](/details-cell/CL0000079). * **Immune and Inflammatory Signaling:** A prominent feature of this cell is its apparent role at the host-environment interface. The high significance of [B2M](/details-gene/567), a component of MHC class I molecules, and [CD74](/details-gene/972), the invariant chain for MHC class II, suggests a capacity for antigen presentation to the adaptive immune system. Furthermore, the strong signal for the chemokine [CXCL8](/details-gene/3576) indicates an ability to recruit neutrophils and initiate inflammatory responses ([Link](https://doi.org/10.1084/jem.167.6.1883)). The expression of [PIGR](/details-gene/5284), the polymeric immunoglobulin receptor, and protease inhibitors like [WFDC2](/details-gene/10406) and [SLPI](/details-gene/6590) underscores a specialized function in mucosal defense and the regulation of local inflammation. * **Cytoskeletal Integrity and Dynamics:** The presence of multiple cytoskeletal and motor protein genes, including [MYL6](/details-gene/4637), [MYL12B](/details-gene/103910), and the actin-depolymerizing factor [CFL1](/details-gene/1072), points to a dynamic cytoskeleton essential for maintaining cell shape, adhesion, and the structural integrity of the multi-layered tissue. The high score for [KRT8](/details-gene/3856) (Keratin 8) is consistent with its epithelial lineage and role in providing mechanical resilience. * **Metabolic and Stress Response Pathways:** [Stratified epithelial cells](/details-cell/CL0000079) appear equipped to handle metabolic and oxidative stress. The high ranking of [SAT1](/details-gene/6303), the rate-limiting enzyme in polyamine catabolism, suggests tight regulation of cell growth and proliferation. [GSTP1](/details-gene/2950) is a key enzyme in detoxification, protecting the cell from reactive oxygen species and xenobiotics. The anti-apoptotic protein [TMBIM6](/details-gene/7009) may contribute to cell survival in a high-stress barrier environment. * **Calcium-Dependent Regulation:** The calcium-binding proteins [S100A6](/details-gene/6277) and [CALM2](/details-gene/805) are significant markers. This indicates that calcium signaling is a critical regulatory mechanism in these cells, likely involved in processes such as differentiation, cell-cell adhesion, and response to external stimuli. The anti-marker profile further refines the functional identity of this cell. The negative significance scores for numerous heterogeneous nuclear ribonucleoproteins ([HNRNPU](/details-gene/3192), [HNRNPA2B1](/details-gene/3181), [HNRNPDL](/details-gene/9987)) and splicing factors ([SRSF5](/details-gene/6430)) may suggest a more streamlined or specialized RNA processing program compared to the average cell. Similarly, the low significance of the damage-associated molecular pattern (DAMP) protein [HMGB1](/details-gene/3146) could reflect a homeostatic state where inflammatory alarm signals are kept at a minimum. ## Clinical Significance and Contextual Roles The defining genes of [stratified epithelial cells](/details-cell/CL0000079) are implicated in a range of pathologies, particularly in cancer and inflammatory diseases, highlighting the cell's central role in maintaining tissue health. The gene [WFDC2](/details-gene/10406), also known as HE4, is a well-established serum biomarker for ovarian carcinoma, and its high specificity in this general epithelial context suggests it plays a fundamental biological role that may be dysregulated during tumorigenesis ([Link](https://pubmed.ncbi.nlm.nih.gov/12839961/)). The pro-inflammatory chemokine [CXCL8](/details-gene/3576) (IL-8) is a major factor in the tumor microenvironment of many carcinomas, promoting angiogenesis and metastasis. Dysregulation of keratin expression, represented here by [KRT8](/details-gene/3856), is a hallmark of epithelial injury and various cancers. In inflammatory conditions, the balance between pro-inflammatory signals like [CXCL8](/details-gene/3576) and protective molecules like the protease inhibitor [SLPI](/details-gene/6590) is critical. Loss of this balance can lead to chronic inflammation and tissue damage. The role of [PIGR](/details-gene/5284) in transcytosing IgA across the epithelial barrier is crucial for mucosal immunity, and defects in this process can increase susceptibility to infections. The high significance of [GSTP1](/details-gene/2950) suggests these cells are on the front line of exposure to environmental toxins, and polymorphisms in this gene are associated with altered risk for various cancers. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** [Stratified epithelial cells](/details-cell/CL0000079) function as non-professional, but highly significant, antigen-presenting cells that orchestrate local adaptive immune responses at barrier surfaces. The coordinated high expression specificity of genes for MHC-I ([B2M](/details-gene/567)), MHC-II ([CD74](/details-gene/972)), and immunoglobulin transport ([PIGR](/details-gene/5284)) suggests a comprehensive system for sampling and presenting both endogenous and exogenous antigens. * **Surprising Findings:** For a cell not of hematopoietic lineage, the concurrent high specificity of markers for both MHC class I and class II antigen processing pathways is noteworthy. This suggests a more versatile role in immune communication than traditionally attributed to epithelial cells. * **Testable Questions:** If a co-culture system is established with [stratified epithelial cells](/details-cell/CL0000079) and naive [T-cells](/details-cell/CL0000084), does exposure of the epithelial layer to specific viral or bacterial antigens lead to activation and proliferation of antigen-specific T-cell subsets? 2. **Hypothesis:** The balance between protease inhibitors ([WFDC2](/details-gene/10406), [SLPI](/details-gene/6590)) and inflammatory chemokines ([CXCL8](/details-gene/3576)) acts as a critical rheostat that controls the transition from tissue homeostasis to active inflammation. Under normal conditions, a protease-inhibitory environment is maintained to preserve the extracellular matrix and barrier integrity. Upon pathogen detection, this balance shifts to permit controlled inflammation and immune cell recruitment. * **Surprising Findings:** The identification of [WFDC2](/details-gene/10406), primarily studied as a cancer biomarker, as a top defining gene of this general cell type suggests its homeostatic function as a potential protease inhibitor may be widely important and currently under-appreciated in non-cancer contexts. * **Testable Questions:** Does siRNA-mediated knockdown of [WFDC2](/details-gene/10406) and [SLPI](/details-gene/6590) in a 3D organoid model of stratified epithelium lead to spontaneous upregulation of [CXCL8](/details-gene/3576) expression and signs of compromised barrier function, even without an external inflammatory stimulus?