Details for: CL0002187

Cell ID: CL0002187

Cell Name: basal cell of epidermis

Description: A mitotically active, columnar-shaped keratinocyte located in the stratum basale of the epidermis and attached to the basement membrane. This cell exhibits heterogeneity, encompassing stem and progenitor subpopulations with distinct molecular and proliferative characteristics (Haensel et al., 2020), and serves as the primary source of new keratinocytes for epidermal renewal, homeostasis, and regeneration.

Synonyms: epidermal basal cell, epidermal basal keratinocyte

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 basal cell of epidermis 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 basal cell of epidermis. 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 basal cell of epidermis. 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 basal cell of epidermis. 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:  basal cell of epidermis (CL0002187)

 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 [basal cell of epidermis](/details-cell/CL0002187) is a mitotically active keratinocyte progenitor located in the stratum basale, responsible for the constant renewal and regeneration of the epidermis. The molecular signature of this cell, based on **Overall** gene significance, highlights its fundamental roles in maintaining tissue integrity and genomic stability. Its identity is defined by a unique transcriptional profile featuring high specificity for genes involved in cell-matrix adhesion, such as [STRC](/details-gene/161497) and [PCDHB15](/details-gene/56121), and robust expression of DNA repair machinery like [HROB](/details-gene/78995), consistent with its high proliferative capacity. Additionally, a significant number of the most specific markers are uncharacterized non-coding RNAs (e.g., `TMEM123 DT`, `LINC02877`), suggesting that a unique, and as-yet poorly understood, regulatory network governs the identity and function of this critical stem/progenitor population. ## Key Characteristics and Function Analysis of top marker genes reveals several core functional clusters that define the [basal cell of epidermis](/details-cell/CL0002187). * **Structural Adhesion and Cytoskeletal Integrity:** The high specificity scores for genes involved in cell adhesion, such as the protocadherin [PCDHB15](/details-gene/56121) and stereocilin ([STRC](/details-gene/161497)), underscore the cell's essential role in anchoring the epidermis to the underlying basement membrane. This function is further supported by the significant expression of [MYL12B](/details-gene/103910), a myosin light chain involved in stress fiber formation, suggesting these cells actively maintain cytoskeletal tension and structural shape within the constantly renewing epidermal tissue. * **Proliferation and Genomic Maintenance:** As a highly proliferative population, maintaining genomic integrity is critical. The high significance of [HROB](/details-gene/78995), a gene involved in DNA synthesis during recombinational repair, is consistent with this role. Furthermore, specific expression of general nuclear factors like the high-mobility group protein [HMGB1](/details-gene/3146), heterogeneous nuclear ribonucleoprotein [HNRNPA1](/details-gene/3178), and transcription factor [BTF3](/details-gene/689) points towards a robust and specialized machinery for DNA management, RNA processing, and transcriptional regulation required to sustain self-renewal and differentiation. * **Developmental and Barrier Functions:** The expression of [GDF3](/details-gene/9573), a member of the TGF-beta superfamily, is consistent with the cell's progenitor status and its role in initiating differentiation programs to generate suprabasal keratinocyte layers. The specific expression of [UGT1A8](/details-gene/54576), an enzyme involved in detoxifying xenobiotics, suggests these basal cells contribute to the skin's chemical barrier function by metabolizing potentially harmful compounds at the point of entry. * **Distinct Lineage Identity:** The anti-marker profile helps to precisely define what this cell is not. The strong negative significance for [KRTAP2 2](/details-gene/728279), a keratin-associated protein found in terminally differentiated structures, confirms the undifferentiated, progenitor state of basal cells. Similarly, the low significance of the inflammatory cytokine [IL31](/details-gene/386653) indicates a non-inflammatory baseline state. The lack of specific enrichment for core mitochondrial respiratory genes (e.g., [NDUFA4](/details-gene/4697), [ATP5F1E](/details-gene/514)) suggests that high-level oxidative phosphorylation is not a uniquely defining characteristic of these cells compared to others. ## Clinical Significance and Contextual Roles The gene signature of the [basal cell of epidermis](/details-cell/CL0002187) provides insights into its potential roles in skin health and disease. The high specificity of [HROB](/details-gene/78995), a key component of the DNA damage response, highlights the cell's reliance on robust repair mechanisms to counteract environmental insults like UV radiation. Dysregulation or mutation in this pathway within the basal cell compartment could be a critical step in the development of skin cancers, such as basal cell carcinoma, by allowing the accumulation of genomic damage in the replicating progenitor pool. The significant expression of [HMGB1](/details-gene/3146) is also clinically relevant. [HMGB1](/details-gene/3146) functions as a damage-associated molecular pattern (DAMP) or alarmin when released from stressed or necrotic cells. Its constitutive high-level expression in basal cells suggests they are primed to signal tissue damage. Upon injury or severe stress, release of [HMGB1](/details-gene/3146) from this abundant cell population could be a primary trigger for sterile inflammation and the initiation of wound healing responses in the skin. One of the most notable findings is the high specificity of [STRC](/details-gene/161497) (stereocilin). Mutations in this gene are a known cause of non-syndromic deafness due to its structural role in the stereocilia of inner ear hair cells ([Link](https://doi.org/10.1038/ng726)). Its prominent and specific expression in epidermal basal cells is a novel observation, suggesting a conserved function in tissues under mechanical stress. This raises the possibility that [STRC](/details-gene/161497) could play a role in mechanotransduction or be implicated in certain genetic skin disorders characterized by compromised epidermal adhesion. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The stereocilin protein ([STRC](/details-gene/161497)), well-established for maintaining the structural integrity of inner ear hair bundles, performs a similar structural role in [basal cell of epidermis](/details-cell/CL0002187) by contributing to the stability of cell-matrix adhesions, potentially as a component of the hemidesmosome or a related anchoring complex. * **Surprising Findings:** A gene whose known pathology is restricted to hereditary deafness ([Link](https://doi.org/10.1038/ng726)) emerges as a top specific marker for a skin progenitor cell. This suggests a previously unrecognized, shared molecular mechanism for maintaining structural integrity in disparate tissues subjected to mechanical force. * **Testable Questions:** Does the targeted knockout of [STRC](/details-gene/161497) in a 3D human skin equivalent model lead to impaired adhesion of basal cells to the basement membrane, resulting in a blistering phenotype or defects in epidermal stratification under mechanical stress? 2. **Hypothesis:** The [basal cell of epidermis](/details-cell/CL0002187) functions as a primary environmental sentinel, coupling the detection of genotoxic stress to the initiation of local immune responses. High constitutive expression of the DNA repair factor [HROB](/details-gene/78995) and the alarmin [HMGB1](/details-gene/3146) primes these cells to release [HMGB1](/details-gene/3146) upon significant DNA damage (e.g., from UV radiation), thereby acting as a first-line signal to recruit and activate immune cells for tissue repair and surveillance. * **Surprising Findings:** This model positions the epidermal progenitor cell not just as a passive target of environmental damage, but as an active participant in orchestrating the initial inflammatory and repair cascades, a role typically attributed to resident immune cells like Langerhans cells. * **Testable Questions:** Following exposure to a sub-lethal dose of UVB radiation, do primary basal keratinocytes in culture release [HMGB1](/details-gene/3146) into the supernatant, and does this conditioned medium induce a pro-inflammatory phenotype (e.g., cytokine secretion, upregulation of MHC molecules) in co-cultured macrophages or dendritic cells?