Details for: CL4033026

Cell ID: CL4033026

Cell Name: lung perichondrial fibroblast

Description: A perichondrial fibroblast that is part of the lung.

Synonyms: PC-fibro

Selected Context(s): Overall

Gene Significance Landscape

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Score:
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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 perichondrial fibroblast 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 perichondrial fibroblast. 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 perichondrial fibroblast. 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 perichondrial fibroblast. 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 perichondrial fibroblast (CL4033026)

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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 perichondrial fibroblast](/details-cell/CL4033026), also known as PC-fibro, is a mesenchymal cell type associated with the perichondrium of lung cartilage. Analysis of its gene expression profile reveals a distinct identity defined by a suite of transcription factors and chromatin-modifying proteins, suggesting a primary role in maintaining a specific and stable transcriptional program. The zinc-finger protein [ZBTB20](/details-gene/26137) emerges as its most specific marker (CSI: 4.98), highlighting transcriptional regulation as a core feature of this cell's identity. This cell appears to be centrally involved in structural maintenance through interactions with the extracellular matrix and tight regulation of its cytoskeleton, with potential roles in development and tissue homeostasis. ## Key Characteristics and Function The functional profile of the [lung perichondrial fibroblast](/details-cell/CL4033026) is dominated by genes involved in gene expression regulation, cytoskeletal dynamics, and cell signaling. These can be grouped into several key functional clusters. * **Transcriptional and Chromatin Regulation:** A significant number of top markers are transcription factors or chromatin-associated proteins. This includes the top marker [ZBTB20](/details-gene/26137), a BTB/POZ domain-containing transcriptional repressor, as well as the nuclear receptor [RORA](/details-gene/6095), the chromatin-binding protein [AUTS2](/details-gene/26053), the bromodomain-containing protein [BAZ2B](/details-gene/29994), and the transcription factor [GLIS3](/details-gene/169792). The high specificity score for the long non-coding RNA [FTX](/details-gene/100302692) further supports a role in complex gene regulation. This signature suggests that the cell's primary function is governed by a tightly controlled and unique transcriptional state, likely essential for maintaining its specialized identity and function within the perichondrial niche. * **Cytoskeletal Dynamics and Cell Migration:** The cell exhibits specific expression of genes controlling cell shape and motility. [FMNL2](/details-gene/114793) is involved in cytoskeleton organization, while [NAV3](/details-gene/89795) is a homolog of the *C. elegans* cell guidance gene *unc-53*. This functional group is further supported by the specific expression of multiple regulators of the Rho GTPase family, including the GTPase activators [DLC1](/details-gene/10395) and [ARHGAP10](/details-gene/79658). This suggests that [lung perichondrial fibroblasts](/details-cell/CL4033026) possess a capacity for dynamic regulation of their morphology and may be involved in directed migration during development or tissue repair. * **Extracellular Matrix and Signaling:** Consistent with its fibroblast identity, the cell is characterized by specific expression of [LAMA2](/details-gene/3908), a subunit of laminin, which is a major component of the basement membrane. This indicates a key role in producing and organizing the local extracellular matrix. Furthermore, the expression of the receptor tyrosine phosphatase [PTPRG](/details-gene/5793) and the cGMP-dependent protein kinase [PRKG1](/details-gene/5592) points to the cell's ability to receive and transduce signals from its microenvironment. * **Metabolic Profile:** The negative significance score for [COX2](/details-gene/4513) (CSI: -0.82), a core component of the mitochondrial electron transport chain, may suggest that these fibroblasts have a relatively lower rate of oxidative phosphorylation compared to other more metabolically active cell types within the lung, such as epithelial cells. ## Clinical Significance and Contextual Roles **Overall**, the gene signature of [lung perichondrial fibroblasts](/details-cell/CL4033026) provides insights into their potential roles in both health and disease, particularly in lung development, structural integrity, and tumorigenesis. Several of the top-ranking specific markers have established links to human disease. [AUTS2](/details-gene/26053) was first identified as a candidate gene for autism ([Link](https://doi.org/10.1006/geno.2002.6810)), and mutations in [GLIS3](/details-gene/169792) are known to cause a rare neonatal syndrome involving diabetes, hypothyroidism, and other systemic defects ([Link](https://doi.org/10.1038/ng1802)). While the roles of these genes are primarily characterized in other systems, their specific expression in this lung fibroblast subtype suggests they may have unappreciated functions in lung organogenesis or homeostasis. Of particular interest is the specific expression of multiple candidate tumor suppressor genes. Both [PTPRG](/details-gene/5793) and [DLC1](/details-gene/10395) are located in chromosomal regions frequently deleted in lung and other cancers, and their loss is implicated in tumor progression ([Link](https://pubmed.ncbi.nlm.nih.gov/8833149/), [Link](https://pubmed.ncbi.nlm.nih.gov/9605766/)). The distinct expression of these genes by [lung perichondrial fibroblasts](/details-cell/CL4033026) suggests that this cell population may constitute a key component of the tumor-suppressive microenvironment of the airways. Dysregulation or loss of this cell type could potentially contribute to the initiation or progression of lung cancer by altering the local stromal context. ## Potential Mechanisms and Research Directions 1. **Hypothesis: [Lung perichondrial fibroblasts](/details-cell/CL4033026) are defined by a core transcriptional regulatory network that dictates airway cartilage support.** The data strongly suggest that the identity of this cell is maintained by a specific set of transcription factors, including the highly specific markers [ZBTB20](/details-gene/26137) and [RORA](/details-gene/6095). We hypothesize that these transcription factors form a regulatory circuit that controls the expression of key structural genes, such as the extracellular matrix component [LAMA2](/details-gene/3908), thereby ensuring the integrity and function of the perichondrium surrounding airway cartilage. * **Surprising Findings:** The identification of genes like [AUTS2](/details-gene/26053) and [NAV3](/details-gene/89795), traditionally studied in the context of neuronal development and migration, as highly specific markers for a lung fibroblast is unexpected. This suggests that conserved molecular programs for cell positioning and guidance may be repurposed in different tissues for structural and developmental roles. * **Testable Questions:** Does CRISPR-mediated knockdown of [ZBTB20](/details-gene/26137) in primary human lung perichondrial fibroblasts lead to a corresponding decrease in [LAMA2](/details-gene/3908) expression and alter the cell's ability to organize extracellular matrix proteins in vitro? 2. **Hypothesis: [Lung perichondrial fibroblasts](/details-cell/CL4033026) function as local tumor suppressors by regulating cytoskeletal tension and cell signaling in the airway microenvironment.** The specific co-expression of the candidate tumor suppressors [PTPRG](/details-gene/5793) and [DLC1](/details-gene/10395), which function as a receptor phosphatase and a RhoGTPase inhibitor, respectively, suggests a role in restraining aberrant cell growth and motility. We hypothesize that these fibroblasts maintain tissue homeostasis by controlling both extracellular signaling and the cytoskeletal dynamics of surrounding cells. Loss of this fibroblast population or downregulation of these specific genes could create a permissive environment for epithelial cell transformation and invasion. * **Surprising Findings:** The enrichment for multiple distinct regulators of Rho GTPase signaling ([DLC1](/details-gene/10395), [ARHGAP10](/details-gene/79658)) in conjunction with a cytoskeletal organizer ([FMNL2](/details-gene/114793)) points to an exceptionally complex and fine-tuned regulation of cell shape and contractility. This level of control may be critical for their specialized structural role adjacent to cartilage. * **Testable Questions:** In a 3D organoid co-culture system, does silencing [DLC1](/details-gene/10395) in [lung perichondrial fibroblasts](/details-cell/CL4033026) alter the growth and invasive potential of premalignant bronchial epithelial cells?