Details for: CL0002327

Cell ID: CL0002327

Cell Name: mammary gland epithelial cell

Description: An epithelial cell of the mammary gland.

Synonyms: breast epithelial cell, mammary epithelial cell

Selected Context(s): Overall

Gene Significance Landscape

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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 mammary gland epithelial 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 mammary gland epithelial 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 mammary gland epithelial 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 mammary gland epithelial 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:  mammary gland epithelial cell (CL0002327)

 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 [mammary gland epithelial cell](/details-cell/CL0002327), also known as a breast epithelial cell, is an epithelial cell of the mammary gland. Based on its gene significance profile, this cell type is characterized by exceptionally high and specific expression of genes involved in core metabolic and biosynthetic processes. **Overall**, the top markers point to a cell with a high demand for mitochondrial energy production, robust protein synthesis and trafficking machinery, and dynamic cytoskeletal regulation. This signature is consistent with its role in maintaining epithelial integrity and its significant secretory capacity, particularly during lactation. Genes such as [CHCHD2](/details-gene/51142), involved in mitochondrial protein import, and [FTH1](/details-gene/2495), a key component of iron storage, are among the most defining markers, suggesting that metabolic regulation and management of oxidative stress are central to its identity and function. ## Key Characteristics and Function The functional identity of the [mammary gland epithelial cell](/details-cell/CL0002327) is strongly defined by several interconnected biological themes, as revealed by its top marker genes. * **Mitochondrial Biogenesis and Energy Metabolism:** A prominent cluster of top markers underscores the cell's reliance on mitochondrial function. This includes the most significant marker, [CHCHD2](/details-gene/51142), and other genes like [NDUFA4](/details-gene/4697), [COX7A2](/details-gene/1347), and [TOMM7](/details-gene/54543), which are integral to the mitochondrial protein import machinery and the respiratory electron transport chain. The high significance of the glycolytic enzyme [GAPDH](/details-gene/2597) further points to a high overall metabolic rate necessary to fuel the cell's synthetic and barrier functions. * **Protein Synthesis, Folding, and Trafficking:** The cell exhibits a strong signature for protein production. High CSI scores for [SRP14](/details-gene/6727), a component of the signal recognition particle essential for targeting proteins for secretion, and [EEF1D](/details-gene/1936), an elongation factor in translation, highlight a robust capacity for protein synthesis. Additionally, the high significance of [NPM1](/details-gene/4869), a nucleolar phosphoprotein involved in ribosome biogenesis, and multiple heterogeneous nuclear ribonucleoproteins like [HNRNPA2B1](/details-gene/3181) and [HNRNPC](/details-gene/3183), suggest extensive regulation of RNA processing and translation. * **Cytoskeletal Organization and Cell Adhesion:** Genes encoding components of the actin-myosin cytoskeleton, such as [MYL6](/details-gene/4637), [MYL12B](/details-gene/103910), and the actin-depolymerizing factor [CFL1](/details-gene/1072), are highly significant. This reflects the importance of maintaining cell shape, polarity, and junctional integrity within the epithelial layer, as well as enabling processes like cell migration and cytokinesis. * **Iron Homeostasis and Oxidative Stress Response:** The ferritin heavy chain [FTH1](/details-gene/2495) is one of the most specific markers, indicating that the sequestration and management of iron is a critical function. This is likely coupled with the cell's high metabolic activity, which generates reactive oxygen species. The high significance of the peroxidase [PRDX1](/details-gene/5052) is consistent with a need for a strong antioxidant defense system to mitigate oxidative damage. * **Anti-Markers:** The low significance scores for genes such as [PRLR](/details-gene/5618) (prolactin receptor) and [HSD17B2](/details-gene/3294) (estradiol 17-beta-dehydrogenase) may suggest this particular profile represents a basal or non-lactating state. Furthermore, the lack of significance for the macrophage scavenger receptor [MARCO](/details-gene/8685) and the antimicrobial peptide [PI3](/details-gene/5266) confirms its distinct epithelial, non-immune lineage. ## Clinical Significance and Contextual Roles **Overall**, the gene signature of the [mammary gland epithelial cell](/details-cell/CL0002327) is dominated by genes essential for fundamental cellular processes. While these "housekeeping" genes are broadly expressed, their exceptionally high and specific expression in this context makes them defining features. Dysregulation of these core pathways is a hallmark of breast cancer. For instance, altered metabolism, often referred to as the Warburg effect, involves upregulation of genes like [GAPDH](/details-gene/2597). The high significance of the damage-associated molecular pattern (DAMP) protein [HMGB1](/details-gene/3146) suggests a potential role in sterile inflammation within the mammary gland microenvironment, a process implicated in both normal tissue remodeling and tumorigenesis. The prominent role of [FTH1](/details-gene/2495) may have clinical implications, as iron metabolism is increasingly recognized as a critical factor in cancer progression, influencing cell proliferation and resistance to therapy. Similarly, the antioxidant enzyme [PRDX1](/details-gene/5052) is often overexpressed in various cancers, including breast cancer, where it can contribute to tumor survival by neutralizing oxidative stress. The high expression of numerous ribonucleoproteins ([NPM1](/details-gene/4869), [HNRNPA2B1](/details-gene/3181)) also has clinical relevance, as these proteins are frequently dysregulated in cancer, affecting RNA splicing, stability, and translation to promote malignant phenotypes. Therefore, while this profile represents a normal physiological state, it highlights core cellular machinery that is vulnerable to oncogenic transformation. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The central role of mitochondrial protein import and respiratory chain components as defining markers suggests that mitochondrial fitness and biogenesis are primary determinants of mammary epithelial cell fate and function. This metabolic identity may be a critical checkpoint that, when dysregulated, predisposes cells to neoplastic transformation. * **Surprising Findings:** It is notable that the most specific marker for this cell is not a canonical epithelial protein like a keratin, but rather [CHCHD2](/details-gene/51142), a mitochondrial intermembrane space protein. This finding elevates the cell's metabolic state from a supporting role to a core feature of its identity. * **Testable Questions:** How does targeted silencing of key mitochondrial import genes like [CHCHD2](/details-gene/51142) or [TOMM7](/details-gene/54543) affect the differentiation potential of mammary epithelial stem cells in 3D organoid culture when stimulated with lactogenic hormones? 2. **Hypothesis:** The co-emergence of [FTH1](/details-gene/2495) (iron storage) and [PRDX1](/details-gene/5052) (antioxidant defense) as top markers indicates that the management of iron-catalyzed oxidative stress is a fundamental and highly specific homeostatic process in these cells. This pathway may act as a critical sensor and regulator of cellular health, with its disruption being a key event in breast pathology. * **Surprising Findings:** While epithelial cells are known to be metabolically active, the high specificity (`csi_z` = 28.50) of the ferritin heavy chain [FTH1](/details-gene/2495) is striking. It suggests iron handling is not just a general housekeeping function but a uniquely specialized task in this cell type, possibly linked to its high metabolic rate or secretory requirements. * **Testable Questions:** What is the functional consequence of [FTH1](/details-gene/2495) knockdown in mammary epithelial cells on their mitochondrial function and susceptibility to ferroptosis, and does this altered state drive pro-inflammatory signaling via pathways involving other key markers like [HMGB1](/details-gene/3146)?