Details for: CL0000667

Cell ID: CL0000667

Cell Name: collagen secreting cell

Description: An extracellular matrix secreting cell that secretes collagen.

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 collagen secreting 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 collagen secreting 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 collagen secreting 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 collagen secreting 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:  collagen secreting cell (CL0000667)

 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 [collagen secreting cell](/details-cell/CL0000667) is defined as a cell type specializing in the secretion of collagen to build and maintain the extracellular matrix. **Overall**, the gene significance profile suggests a cell that is not only a structural component but also a highly active metabolic and immunological hub. Its identity is uniquely defined by genes involved in Golgi-mediated protein processing, such as [ITM2B](/details-gene/9445), and antigen presentation, such as [B2M](/details-gene/567), rather than by collagen genes themselves. This indicates a complex functional role extending beyond simple matrix deposition to include active protein turnover and communication with the immune system. ## Key Characteristics and Function The defining features of the [collagen secreting cell](/details-cell/CL0000667), based on its gene significance profile, can be grouped into several key functional clusters. * **Intense Metabolic Activity:** A striking characteristic of this cell is the high significance of numerous mitochondrial genes. Genes encoding components of the electron transport chain, including [COX1](/details-gene/4512), [CYTB](/details-gene/4519), [COX2](/details-gene/4513), [ND5](/details-gene/4540), [ND1](/details-gene/4535), [ND3](/details-gene/4537), and [ATP6](/details-gene/4508), are among the top markers. This strong signature of oxidative phosphorylation suggests a high energy demand, which is consistent with the significant metabolic cost of synthesizing and secreting large quantities of proteins like collagen. * **Protein Synthesis, Processing, and Secretion:** The most specific marker, [ITM2B](/details-gene/9445) (CSI: 17.43), is integral to the Golgi membrane and is implicated in protein processing. This aligns perfectly with a cell dedicated to secretion. This is further supported by the high significance of [UBC](/details-gene/7316), involved in protein turnover, and [DDX5](/details-gene/1655), an RNA helicase essential for mRNA splicing and processing. The long non-coding RNA [NEAT1](/details-gene/283131), which is crucial for the structure of nuclear paraspeckles, also points towards complex regulation of gene expression and RNA processing. * **Cytoskeletal Organization:** The cell exhibits a strong signature for cytoskeletal components, including myosin light chains ([MYL12B](/details-gene/103910), [MYL6](/details-gene/4637)) and cofilin ([CFL1](/details-gene/1072)). These genes are crucial for maintaining cell structure, forming stress fibers, and facilitating the intracellular transport and exocytosis of secretory vesicles, all of which are essential for a professional secretory cell. * **Immune System Interface:** A notable feature is the high significance of genes involved in antigen presentation, such as [B2M](/details-gene/567) and [HLA E](/details-gene/3133). [B2M](/details-gene/567) is a core component of MHC class I molecules, which present endogenous peptides to cytotoxic T cells. [HLA E](/details-gene/3133) is a non-classical MHC class I molecule that primarily interacts with NK cells. This suggests that [collagen secreting cells](/details-cell/CL0000667) are not immunologically inert but may actively participate in tissue surveillance and immune modulation. * **Angiogenesis and Development:** The presence of markers like [ENG](/details-gene/2022) (Endoglin), [EGFL7](/details-gene/51162), and the progenitor cell marker [CD34](/details-gene/947) suggests a potential relationship with endothelial cells and a role in vascular development and tissue repair. The profile of anti-markers, or least significant genes, is equally informative. The low significance of genes like the receptor tyrosine kinase [TEK](/details-gene/7010), which is critical for endothelial cells, helps to distinguish this cell from a purely vascular lineage despite the expression of some pro-angiogenic factors. ## Clinical Significance and Contextual Roles The gene expression profile of the [collagen secreting cell](/details-cell/CL0000667) provides insights into its potential roles in disease. The top marker, [ITM2B](/details-gene/9445), is directly linked to familial British and Danish dementias, which are neurodegenerative diseases characterized by the formation of amyloid plaques ([Link](https://doi.org/10.1038/21637), [Link](https://doi.org/10.1073/pnas.080076097)). This strong association suggests that dysfunction in this cell type, particularly in its protein processing and degradation pathways, could contribute to protein aggregation disorders that extend beyond the central nervous system to other tissues. The pronounced mitochondrial gene signature indicates a reliance on oxidative phosphorylation, making these cells potentially vulnerable to mitochondrial dysfunction. This is a common feature in aging and a wide range of pathologies, including fibrotic diseases and metabolic syndrome. Pathological conditions that induce hypoxia or oxidative stress could severely compromise the function of these cells, leading to aberrant matrix deposition and tissue damage. The expression of immune-modulatory molecules [B2M](/details-gene/567) and [HLA E](/details-gene/3133) implies that these cells are active participants in the tissue microenvironment. In chronic inflammation or cancer, these cells could influence immune cell behavior, potentially contributing to either immune suppression or pro-inflammatory signaling depending on the context. The expression of [ENG](/details-gene/2022) also suggests a role in tumor angiogenesis. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The primary defining characteristic of this [collagen secreting cell](/details-cell/CL0000667) population is not collagen production per se, but its specialized function in processing extracellular proteins and actively engaging with the immune system via MHC class I pathways. * **Surprising Findings:** The most significant and specific markers are not collagen or matrix-modifying enzyme genes. Instead, they relate to general protein processing ([ITM2B](/details-gene/9445)), immune presentation ([B2M](/details-gene/567)), and cellular metabolism ([COX1](/details-gene/4512), [CYTB](/details-gene/4519)). * **Testable Questions:** How does the secretome of these cells change following knockdown of [ITM2B](/details-gene/9445)? Furthermore, in a co-culture system, does altering the expression of [B2M](/details-gene/567) in these cells affect the activation and cytotoxic function of CD8+ T cells or NK cells? 2. **Hypothesis:** The high metabolic rate, driven by oxidative phosphorylation, is a critical regulator of the cell's secretory capacity and its immunomodulatory potential. The cell's bioenergetic state may act as a central hub integrating microenvironmental cues to control tissue homeostasis and pathology. * **Surprising Findings:** An unexpectedly large fraction of the top 20 marker genes are core components of the mitochondrial electron transport chain, highlighting energy production as a uniquely defining feature of this cell's identity. * **Testable Questions:** How does pharmacological inhibition of mitochondrial respiration (e.g., using rotenone or antimycin A) impact the expression and secretion of key extracellular matrix proteins and the cell-surface levels of [B2M](/details-gene/567) and [HLA E](/details-gene/3133)?