Details for: CL0000499

Cell ID: CL0000499

Cell Name: stromal cell

Description: A connective tissue cell of an organ found in the loose connective tissue.

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 stromal 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 stromal 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 stromal 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 stromal 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:  stromal cell (CL0000499)

 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 [stromal cell](/details-cell/CL0000499), defined as a connective tissue cell, exhibits a gene expression profile indicative of a highly metabolically active and structurally foundational cell type. **Overall**, the top marker genes with high expression specificity (csi_z) are not exotic, tissue-specific factors, but rather genes central to fundamental cellular processes such as protein translation ([TPT1](/details-gene/7178)), iron homeostasis ([FTH1](/details-gene/2495), [FTL](/details-gene/2512)), and bioenergetics ([COX1](/details-gene/4512)). This suggests that the unique identity of stromal cells is defined by their exceptionally high and stable activity in maintaining cellular and tissue homeostasis, acting as essential metabolic and structural hubs within their microenvironment. ## Key Characteristics and Function The gene significance profile of the [stromal cell](/details-cell/CL0000499) points towards several core functional axes that define its biological role. * **High Metabolic and Bioenergetic Activity:** A striking number of top markers are components of the mitochondrial electron transport chain. These include [COX1](/details-gene/4512), [CYTB](/details-gene/4519), [ND3](/details-gene/4537), [ND4](/details-gene/4538), and [COX7C](/details-gene/1350). The high specificity scores for these genes suggest that robust aerobic respiration is not just a housekeeping function but a defining characteristic, likely fueling the high energetic demands of extracellular matrix synthesis, remodeling, and intercellular communication. * **Robust Protein Synthesis and Turnover:** The cell is well-equipped for high-volume protein management. Top markers include genes involved in translation, such as translationally controlled tumor protein ([TPT1](/details-gene/7178)) and elongation factors ([EEF1B2](/details-gene/1933), [EEF1D](/details-gene/1936)). This is complemented by a strong signature for protein degradation and quality control, evidenced by the high significance of polyubiquitin genes [UBC](/details-gene/7316) and [UBB](/details-gene/7314). This powerful synthesis and turnover machinery is consistent with the stromal cell's primary role in producing and maintaining the dynamic connective tissue environment. * **Central Role in Iron Homeostasis:** The prominent status of both ferritin light chain ([FTL](/details-gene/2512)) and heavy chain ([FTH1](/details-gene/2495)) underscores the cell's importance in iron sequestration and management. This function is critical not only for supporting its own mitochondrial activity but also for regulating local iron availability, which can influence inflammation and the growth of other cells in the microenvironment. * **Immune System Interaction and Tissue Surveillance:** The high significance of Beta-2-microglobulin ([B2M](/details-gene/567)), an essential component of MHC class I molecules, indicates that stromal cells constitutively present endogenous antigens, positioning them as key interactors with the adaptive immune system, particularly cytotoxic T-cells. Furthermore, the notable expression of [HMGB1](/details-gene/3146), a potent damage-associated molecular pattern (DAMP), suggests stromal cells can act as sentinels that initiate inflammatory and repair responses upon tissue injury. * **Cytoskeletal Dynamics and Signaling:** Markers such as the calcium-binding protein [S100A6](/details-gene/6277) and myosin light chain [MYL6](/details-gene/4637) point to a dynamic cytoskeleton capable of responding to both mechanical and signaling cues. This plasticity is essential for cell migration, contraction, and the structural organization of tissues. The anti-marker profile further refines the stromal cell's identity. The low significance of genes like [CYP11A1](/details-gene/1583) (cholesterol side-chain cleavage enzyme) and various immunoglobulin components (e.g., [IGKV4 1](/details-gene/28908)) confirms its distinct lineage from steroidogenic endocrine cells and B-lymphocytes. ## Clinical Significance and Contextual Roles The gene profile of [stromal cells](/details-cell/CL0000499) places them at the crossroads of tissue homeostasis, inflammation, and disease. Their foundational roles suggest that their dysregulation could be a key factor in numerous pathologies. * **Inflammation and Fibrosis:** The high expression of [HMGB1](/details-gene/3146) positions stromal cells as potential initiators of sterile inflammation following tissue damage. In chronic conditions, persistent release of [HMGB1](/details-gene/3146) could contribute to a non-resolving inflammatory state, which, coupled with their inherent capacity for matrix production, may drive fibrotic diseases. * **Cancer Microenvironment:** In cancer, the tumor stroma is critical for disease progression. The identified markers highlight how these cells can support tumors. Their high metabolic rate ([COX1](/details-gene/4512), [CYTB](/details-gene/4519)) could condition the metabolic landscape of the tumor microenvironment. Their expression of [GSTP1](/details-gene/2950), a glutathione S-transferase, may contribute to detoxification and chemoresistance. The expression of [YBX1](/details-gene/4904) has also been linked to cancer progression and drug resistance [Link](https://pubmed.ncbi.nlm.nih.gov/3174636/). * **Neurodegeneration:** The significant expression of [ITM2B](/details-gene/9445), a gene whose mutation is associated with familial British and Danish dementias through the formation of amyloid peptides ([Link](https://doi.org/10.1038/21637)), suggests that stromal-like cells in the central nervous system (such as pericytes or a subset of astrocytes) may play a role in the pathogenesis of protein-aggregation diseases. * **Immune Modulation:** Through constant antigen presentation via MHC-I ([B2M](/details-gene/567)), stromal cells are perpetually engaged in immune surveillance. Alterations in their antigen presentation machinery or stress-induced changes in the presented peptides could influence autoimmune responses or the failure of immune-mediated clearance of malignant cells. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The bioenergetic state of stromal cells, particularly their mitochondrial respiratory capacity and iron metabolism, is a central regulator of their function and a critical determinant of tissue fate in response to stress. We propose that a shift from efficient oxidative phosphorylation towards a more glycolytic state, or dysregulation in iron handling ([FTH1](/details-gene/2495), [FTL](/details-gene/2512)), represents a key event that switches stromal cells from a homeostatic, tissue-supporting phenotype to a pro-fibrotic or pro-tumoral state. * **Surprising Findings:** The observation that multiple components of the mitochondrial electron transport chain (e.g., [COX1](/details-gene/4512), [CYTB](/details-gene/4519)) serve as highly specific defining markers for stromal cells is striking. It implies that their identity is not just defined by secreted proteins, but fundamentally by their core energy-producing machinery, suggesting metabolic state is a primary feature of their lineage identity. * **Testable Questions:** In a model of liver fibrosis, does stromal cell-specific knockout of a key mitochondrial complex component, such as [NDUFS4], alter their activation into myofibroblasts and reduce collagen deposition following chronic injury? 2. **Hypothesis:** [Stromal cells](/details-cell/CL0000499) function as primary tissue sentinels that orchestrate both innate and adaptive immune responses via a two-signal mechanism. Upon injury, the passive release of pre-formed, abundant intracellular proteins like [HMGB1](/details-gene/3146) provides a rapid 'danger' signal (Signal 1) to innate immune cells. Concurrently, stress-induced changes in the proteome lead to altered presentation of endogenous peptides via their highly active MHC-I machinery ([B2M](/details-gene/567)), providing a context-specific 'qualitative' signal (Signal 2) that educates the responding T-cell population, thereby directing the subsequent adaptive immune response towards tolerance, repair, or chronic inflammation. * **Surprising Findings:** While [B2M](/details-gene/567) is ubiquitously expressed, its emergence as a top specificity marker (csi_z) is unexpected. This suggests that the *quantitative level* of MHC-I expression on stromal cells is significantly and consistently higher than on many other cell types, making them disproportionately important for T-cell surveillance within a given tissue. * **Testable Questions:** If stromal cells are co-cultured with naive [CD8-positive, alpha-beta T cells](/details-cell/CL0000625) and subjected to sub-lethal oxidative stress, does the peptide repertoire presented on their MHC-I molecules change, and does this altered repertoire skew T-cell differentiation towards an inflammatory (IFN-gamma producing) versus a regulatory phenotype?