Details for: CL1000271

Cell ID: CL1000271

Cell Name: lung ciliated cell

Description: An epithelial cell that is part of the lung epithelium. This cell is characterised by the presence of cilia on its apical surface.

Synonyms: lung ciliated cell

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 lung ciliated 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 lung ciliated 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 lung ciliated 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 lung ciliated 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:  lung ciliated cell (CL1000271)

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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 [lung ciliated cell](/details-cell/CL1000271) is a specialized epithelial cell central to the mucociliary clearance mechanism of the respiratory tract. Its identity, as revealed by gene significance analysis, is overwhelmingly defined by a highly coordinated network of genes governing calcium-dependent signaling, high-energy metabolism, and robust antioxidant defense. The unique expression specificity (high `CSI (Z-SCORE)`) of genes such as the calcium channel regulator [TMBIM6](/details-gene/7009) and the calcium sensors [CALM1](/details-gene/801) and [CALM2](/details-gene/805) underscores the critical role of precisely controlled calcium dynamics in powering ciliary motion. This high metabolic demand is supported by a suite of specifically expressed mitochondrial genes, positioning the [lung ciliated cell](/details-cell/CL1000271) as a metabolically active and functionally indispensable component of the lung's first line of defense. ## Key Characteristics and Function Analysis of the top marker genes in the **Overall** context reveals several interconnected functional themes that define the [lung ciliated cell](/details-cell/CL1000271). * **Calcium-Dependent Ciliary Motility:** A dominant signature of this cell type is the highly specific expression of genes involved in calcium signaling and its translation into mechanical force. The calmodulin genes [CALM1](/details-gene/801) and [CALM2](/details-gene/805) are exceptionally specific markers, consistent with their role as primary calcium sensors that modulate ciliary beat frequency. This is further supported by the top marker [TMBIM6](/details-gene/7009), involved in calcium channel activity, and [SARAF](/details-gene/51669), a key negative regulator of store-operated calcium entry, which together suggest a system of finely tuned calcium homeostasis to prevent cellular damage from calcium overload while maintaining rhythmic motion. The high specificity of [MYL12B](/details-gene/103910), a myosin regulatory light chain, likely reflects its role in the actin-based structures at the ciliary base, which are essential for coordinating movement. * **High Metabolic Activity and Energy Production:** The constant motion of cilia requires substantial energy, a fact reflected by the specific expression of numerous mitochondrial genes. Components of the electron transport chain, including [ND2](/details-gene/4536), [ND4](/details-gene/4538), [COX7C](/details-gene/1350), and [NDUFA4](/details-gene/4697), are among the top markers. This indicates that the [lung ciliated cell](/details-cell/CL1000271) is constitutively engaged in a high rate of aerobic respiration to generate the ATP necessary to power the dynein motors of the ciliary axoneme. * **Robust Antioxidant and Cytoprotective Systems:** As a cell at the interface with the external environment, the [lung ciliated cell](/details-cell/CL1000271) displays a unique signature of cytoprotective gene expression. Highly specific markers include glutathione S-transferase [GSTP1](/details-gene/2950), superoxide dismutase [SOD1](/details-gene/6647), and peroxiredoxin [PRDX1](/details-gene/5052), all of which are critical for detoxifying reactive oxygen species (ROS) generated from inhaled pollutants, pathogens, or from its own high metabolic rate. The high significance of ferritin subunits [FTH1](/details-gene/2495) and [FTL](/details-gene/2512) also points to a specialized role in managing iron, a key catalyst in the production of ROS, further protecting the cell from oxidative damage. * **Protein Homeostasis and RNA Processing:** Maintaining the complex ciliary machinery requires a sophisticated protein production and quality control system. The high significance of genes like [UBB](/details-gene/7314) (ubiquitin) and [SKP1](/details-gene/6500) (a component of the SCF ubiquitin ligase complex) suggests a high rate of protein turnover. Furthermore, the prominence of RNA-binding proteins and helicases like [HNRNPA2B1](/details-gene/3181) and [DDX5](/details-gene/1655), as well as the long non-coding RNA [NEAT1](/details-gene/283131), indicates that post-transcriptional regulation and precise mRNA processing are defining features of this cell's biology, likely to ensure the correct stoichiometry and assembly of multicomponent ciliary structures. The anti-marker profile further refines this cell's identity. The low specificity for genes associated with spermatogenesis (e.g., [ROPN1B](/details-gene/152015)) or specific axonemal components like [DNAH3](/details-gene/55567), despite both cell types having motile axonemes, highlights the unique transcriptional program of the [lung ciliated cell](/details-cell/CL1000271) and suggests reliance on different dynein isoforms or regulatory proteins. ## Clinical Significance and Contextual Roles The gene signature of the [lung ciliated cell](/details-cell/CL1000271) has direct implications for respiratory health and disease. Since the provided data is limited to an **Overall** context, we can infer potential clinical roles based on the cell's fundamental biology rather than dynamic changes in response to disease. Dysfunction of the core pathways identified is central to several lung pathologies. Impaired mucociliary clearance, a hallmark of diseases like primary ciliary dyskinesia (PCD), cystic fibrosis, and chronic obstructive pulmonary disease (COPD), can be directly linked to defects in the calcium signaling and metabolic machinery defined by these marker genes. For instance, disruptions in the precise regulation of ciliary beat by calcium-sensitive proteins like [CALM1](/details-gene/801) could lead to ineffective mucus transport, chronic infection, and inflammation. The prominent antioxidant signature, featuring [GSTP1](/details-gene/2950), [SOD1](/details-gene/6647), and [PRDX1](/details-gene/5052), positions the [lung ciliated cell](/details-cell/CL1000271) as a critical sentinel against environmental insults. In conditions characterized by high oxidative stress, such as in the lungs of smokers or individuals with asthma, the capacity of this antioxidant system is likely a key determinant of cell survival and the maintenance of epithelial integrity. Polymorphisms or altered expression of these genes could predispose individuals to more severe outcomes in these diseases. Furthermore, the cell's reliance on a robust protein homeostasis network, indicated by markers like [UBB](/details-gene/7314), suggests a vulnerability to proteotoxic stress. Conditions that overwhelm this system could lead to the accumulation of misfolded proteins, ciliary dysfunction, and eventual cell death, contributing to the pathogenesis of chronic lung diseases. ## Potential Mechanisms and Research Directions 1. **Hypothesis: Calcium signaling and the antioxidant response are functionally coupled to maintain ciliary function under environmental stress.** The data reveals that the two most prominent functional clusters defining the [lung ciliated cell](/details-cell/CL1000271) are calcium-dependent motility (e.g., [CALM1](/details-gene/801), [TMBIM6](/details-gene/7009)) and defense against oxidative stress (e.g., [GSTP1](/details-gene/2950), [SOD1](/details-gene/6647)). We hypothesize that these pathways are not independent but are directly linked. Specifically, calcium influx, essential for regulating ciliary beat, may also act as a second messenger to activate transcription factors (e.g., NRF2) that drive the expression of the cell's antioxidant machinery, creating an adaptive feed-forward loop that protects the cell from the increased ROS produced during heightened metabolic activity. * **Surprising Findings:** The high specificity of [SARAF](/details-gene/51669), a protein that *inactivates* store-operated calcium entry, is unexpected. This suggests that preventing calcium overload and terminating the signal is as critical to the cell's identity as initiating it. This tight negative regulation might be a key mechanism to prevent calcium-induced apoptosis and preserve mitochondrial function in the face of constant stimulation. * **Testable Questions:** In an air-liquid interface culture of primary human bronchial epithelial cells, does exposure to an oxidant like H2O2 or cigarette smoke extract trigger a [TMBIM6](/details-gene/7009)-dependent calcium flux that precedes the upregulation of [GSTP1](/details-gene/2950) and [SOD1](/details-gene/6647) expression? 2. **Hypothesis: The lncRNA NEAT1 acts as a post-transcriptional hub for organizing the production of the ciliary proteome.** The intricate structure of the cilium requires the coordinated expression and assembly of hundreds of proteins. The data shows a high specificity not only for protein quality control machinery ([UBB](/details-gene/7314)) but also for factors involved in RNA processing ([DDX5](/details-gene/1655)) and, notably, the long non-coding RNA [NEAT1](/details-gene/283131), a core structural component of nuclear paraspeckles. We hypothesize that [NEAT1](/details-gene/283131)-containing paraspeckles are a key feature of the [lung ciliated cell](/details-cell/CL1000271) nucleus, serving to sequester and regulate splicing factors or specific mRNAs to ensure the orderly and efficient production of the ciliary proteome. * **Surprising Findings:** The identification of a structural lncRNA as a highly specific marker for a cell defined by a motile organelle is a novel finding. It suggests that higher-order nuclear organization plays a direct and defining role in the specialized cytoplasmic function of this cell, moving beyond simple transcriptional control to a model of post-transcriptional regulation via nuclear compartmentalization. * **Testable Questions:** Does siRNA-mediated knockdown of [NEAT1](/details-gene/283131) in differentiating ciliated cells disrupt the formation of paraspeckles and lead to aberrant splicing or reduced expression of key axonemal proteins, ultimately resulting in defects in ciliogenesis or ciliary motility?