Details for: CL0000082

Cell ID: CL0000082

Cell Name: epithelial cell of lung

Description: An epithelial cell of the lung.

Synonyms: lung epithelial cell

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 epithelial cell of lung 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 epithelial cell of lung. 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 epithelial cell of lung. 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 epithelial cell of lung. 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:  epithelial cell of lung (CL0000082)

 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 [epithelial cell of lung](/details-cell/CL0000082) is a fundamental cell type that forms the lining of the respiratory tract. Based on gene significance analysis, this cell is characterized by an exceptionally high level of metabolic activity and robust housekeeping functions. The top marker genes, identified by their expression specificity (**Overall** context `csi_z` score), are dominated by components of mitochondrial respiration, protein synthesis, and cellular maintenance. This profile suggests that the [epithelial cell of lung](/details-cell/CL0000082) operates as a high-energy metabolic hub, essential for maintaining the critical barrier and secretory functions required at the interface between the body and the external environment. ## Key Characteristics and Function Analysis of the most specific gene markers for the [epithelial cell of lung](/details-cell/CL0000082) reveals several core functional clusters that define its biological role. * **Mitochondrial Energy Production:** A prominent signature of this cell type is its powerful machinery for aerobic respiration. Multiple subunits of the electron transport chain and ATP synthase complexes are among the top markers, including [ATP5MC2](/details-gene/517), [COX7C](/details-gene/1350), [ATP5MG](/details-gene/10632), and [COX4I1](/details-gene/1327). The high specificity of the mitochondrial transporter [SLC25A6](/details-gene/293) further underscores a high rate of ATP/ADP flux. This metabolic profile is consistent with the significant energy demands of maintaining ion gradients, surfactant production, and ciliary motion. * **Protein Synthesis and Lifecycle Management:** The cell demonstrates a profound investment in protein production and regulation. The top marker, [TPT1](/details-gene/7178), is a translationally controlled protein, indicating tight regulation of protein synthesis. This is complemented by high rankings for [NPM1](/details-gene/4869), involved in ribosome biogenesis, the poly(A)-binding protein [PABPC1](/details-gene/26986), and the elongation factor [EEF1D](/details-gene/1936). The presence of [UBB](/details-gene/7314) (ubiquitin) highlights the importance of protein quality control and turnover. This suggests the cell is primed for rapid, regulated protein synthesis in response to physiological or pathological signals. * **Detoxification and Stress Response:** The lung epithelium is a primary interface with environmental toxins. The high significance of [GSTP1](/details-gene/2950), a key phase II detoxification enzyme, highlights its role in metabolizing xenobiotics and mitigating oxidative stress. Additionally, [FTH1](/details-gene/2495) (ferritin heavy chain) points to a critical role in managing iron homeostasis and protecting against iron-induced oxidative damage, a significant threat in the oxygen-rich lung environment. * **Nuclear and Structural Integrity:** Genes involved in nuclear organization and cytoskeletal function are also defining features. These include histone variants [H3-3A](/details-gene/3020) and [H3-3B](/details-gene/3021), and the myosin light chain [MYL6](/details-gene/4637). This reflects the cell's need to maintain chromatin accessibility for a dynamic transcriptional program and preserve the physical integrity of the epithelial barrier. * **Anti-Markers:** The low relative significance of genes like [SPDEF](/details-gene/25803), a transcription factor crucial for goblet cell differentiation, or specific keratins like [KRT6A](/details-gene/3853), suggests that the analyzed cell population may represent a more generalist or basal epithelial phenotype, rather than a terminally differentiated secretory or structural subtype. ## Clinical Significance and Contextual Roles While this analysis is based on a general **Overall** context, the top marker genes of lung epithelial cells have significant implications for respiratory health and disease. * **Role in Carcinogenesis:** Several top markers are implicated in cancer. [NPM1](/details-gene/4869) is a proto-oncogene frequently mutated in hematological malignancies, and its role in ribosome biogenesis and cell cycle control makes it a plausible factor in the uncontrolled proliferation seen in lung cancer [Link](https://pubmed.ncbi.nlm.nih.gov/2713355/). [TPT1](/details-gene/7178), the top marker, is also known as tumor protein, translationally-controlled 1, and its expression is often elevated in various cancers, suggesting it could be a biomarker or therapeutic target in lung malignancies. * **Defense Against Environmental Insults:** The lung epithelium's role as a first line of defense is underscored by its detoxification and antioxidant capacity. The high specificity of [GSTP1](/details-gene/2950) is clinically relevant, as polymorphisms in this gene are associated with altered susceptibility to environmental toxins and risk for diseases like asthma and chronic obstructive pulmonary disease (COPD). Dysregulation of iron metabolism, managed by proteins like [FTH1](/details-gene/2495), is increasingly linked to the pathogenesis of idiopathic pulmonary fibrosis and acute respiratory distress syndrome (ARDS). * **Metabolic Reprogramming in Disease:** The profound reliance on mitochondrial metabolism suggests that lung epithelial cells may be vulnerable to mitochondrial dysfunction. Metabolic reprogramming is a hallmark of many lung diseases, including pulmonary fibrosis and cancer. The genes identified here, such as [COX4I1](/details-gene/1327) and [ATP5MC2](/details-gene/517), represent potential nodes where disease processes could disrupt cellular energetics and compromise epithelial function. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The defining characteristic of lung epithelial cells is not merely their barrier function, but their robust bioenergetic and detoxification capacity that sustains this barrier under constant environmental stress. The cell's identity is defined by a high state of metabolic readiness. * **Surprising Findings:** The most specific markers are not classic tight junction or adhesion proteins (e.g., claudins, occludins) but are instead the "housekeeping" genes that power and maintain the cell. This suggests that the *capacity* to maintain the barrier, rather than the static components of the barrier itself, is the most unique feature of this cell type in a broad comparative context. * **Testable Questions:** How does targeted inhibition of top mitochondrial markers like [COX7C](/details-gene/1350) or the ATP/ADP translocase [SLC25A6](/details-gene/293) specifically affect transepithelial electrical resistance and permeability in primary human lung epithelial cell cultures compared to epithelial cells from other tissues (e.g., gut or kidney)? 2. **Hypothesis:** The high specificity of genes controlling protein synthesis ([NPM1](/details-gene/4869), [TPT1](/details-gene/7178), [PABPC1](/details-gene/26986)) indicates that lung epithelial cells are in a state of "translational poise," enabling them to rapidly synthesize and secrete effector proteins (e.g., cytokines, mucins, surfactant proteins) in response to infection or injury without requiring slow, de novo transcription of the entire synthesis machinery. * **Surprising Findings:** The prominence of [TPT1](/details-gene/7178), a protein whose translation is tightly controlled, suggests that this poised state is actively regulated and not simply a result of high constitutive expression. This implies a sophisticated mechanism for gating the cell's response to stimuli at the level of protein synthesis. * **Testable Questions:** Using ribosome profiling (Ribo-Seq), can we demonstrate that upon stimulation with a viral mimic (poly(I:C)) or a bacterial component (LPS), a pre-existing pool of mRNAs for inflammatory cytokines becomes rapidly loaded onto polysomes in lung epithelial cells, and is this process dependent on the baseline expression levels of [NPM1](/details-gene/4869) or [PABPC1](/details-gene/26986)?