Details for: CL1000458

Cell ID: CL1000458

Cell Name: melanocyte of skin

Description: A melanocyte that is part of the skin of body.

Synonyms: skin melanocyte

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

Image representation

Depiction of melanocyte of skin
Courtesy of SwissBioPics

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for melanocyte of skin 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 melanocyte of skin. 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 melanocyte of skin. 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 melanocyte of skin. 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:  melanocyte of skin (CL1000458)

 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.

Loading network (please wait)...

## Summary A [melanocyte of skin](/details-cell/CL1000458) is a specialized cell residing within the skin, primarily known for its role in producing melanin, the pigment responsible for skin, hair, and eye color, and for providing protection against ultraviolet radiation. **Overall**, the gene significance profile suggests a complex cellular identity defined not only by metabolic and protective functions but also by a surprisingly unique transcriptional landscape. The cell's identity is marked by a large number of highly specific but functionally uncharacterized non-coding RNAs, such as `TBC1D8 AS1` and `UXT AS1`. Additionally, the presence of unexpected markers like the T-cell receptor component [TRAV39](/details-gene/28642) and the developmental factor [GDF3](/details-gene/9573) suggests that skin melanocytes may possess unappreciated roles in developmental signaling and local immune modulation. ## Key Characteristics and Function The gene expression profile of [melanocyte of skin](/details-cell/CL1000458) points to several key functional themes. * **Unique Regulatory Landscape:** A striking feature is the high specificity score (`csi_z`) for numerous long non-coding RNAs (lncRNAs) and antisense transcripts, including `TBC1D8 AS1`, `UXT AS1`, `TMEM123 DT`, `ZBTB20 AS4`, and `SNHG8`. This suggests that the unique identity and functional state of skin melanocytes are maintained through a complex, and largely uncharacterized, layer of post-transcriptional and epigenetic regulation. * **Oxidative Stress Defense and Metabolism:** The high significance of [GPX4](/details-gene/2879), a key enzyme in preventing lipid peroxidation and ferroptotic cell death, is consistent with the melanocyte's role in mitigating oxidative stress from UV radiation. Similarly, the expression of [UGT1A8](/details-gene/54576), a UDP-glucuronosyltransferase, points towards a role in detoxifying xenobiotic and endobiotic compounds, which is critical for a cell at the environmental interface. The significance of [FIS1](/details-gene/51024), a regulator of mitochondrial fission, further highlights the importance of maintaining mitochondrial homeostasis in response to cellular stress. * **Developmental and Adhesion Roles:** The specific expression of [GDF3](/details-gene/9573), a member of the TGF-beta superfamily involved in embryonic development, and the transcription factor [DBX2](/details-gene/440097) may indicate that these genes are important for maintaining the melanocyte's differentiated state within the skin niche. Furthermore, expression of cell adhesion molecules like [PCDHB15](/details-gene/56121) and [STRC](/details-gene/161497) likely mediates interactions with surrounding keratinocytes and the extracellular matrix. * **Potential Immune Interaction:** The high specificity score for [TRAV39](/details-gene/28642), a T-cell receptor alpha variable chain gene, is highly unusual for a non-lymphoid cell. This finding, while requiring further validation, may suggest a novel mechanism of interaction with immune cells in the skin microenvironment. * **Anti-Markers Profile:** The least significant genes for this cell type include ubiquitous housekeeping genes such as [LDHA](/details-gene/3939) (glycolysis), [TUFM](/details-gene/7284) (mitochondrial translation), [VCP](/details-gene/7415) (protein quality control), and [XRCC6](/details-gene/2547) (DNA repair). Their low specificity suggests that while melanocytes perform these essential functions, their unique cellular identity is defined by a more specialized set of genes rather than by the core cellular machinery. ## Clinical Significance and Contextual Roles **Overall**, the gene signature of skin melanocytes provides insights into their potential roles in skin homeostasis and pathology. The prominent role of [GPX4](/details-gene/2879) is clinically relevant, as inhibiting [GPX4](/details-gene/2879) is a known strategy to induce ferroptosis, a form of iron-dependent cell death that has emerged as a promising therapeutic avenue for treating melanoma, a cancer originating from melanocytes. The high specificity of [GPX4](/details-gene/2879) suggests it is a critical survival factor for this cell lineage. The unexpected expression of [STRC](/details-gene/161497), a gene whose mutation causes non-syndromic deafness ([Link](https://doi.org/10.1038/ng726)), is intriguing. This could provide a molecular link for syndromic disorders that present with both pigmentation defects and hearing loss, suggesting a shared molecular pathway between inner ear hair cells and skin melanocytes. The large number of highly specific lncRNAs represents a pool of potential biomarkers for melanocyte-related disorders, including vitiligo and melanoma. Their functional characterization could unveil novel regulatory networks that, when dysregulated, contribute to disease pathogenesis. For instance, the prion-related protein [PRND](/details-gene/23627) has been implicated in neurodegenerative diseases but its specific role in melanocytes is unknown and warrants further investigation ([Link](https://doi.org/10.1006/jmbi.1999.3108)). ## Potential Mechanisms and Research Directions 1. **Hypothesis: Skin melanocytes utilize components of adaptive immune machinery for local immunomodulation.** The specific expression of the T-cell receptor gene [TRAV39](/details-gene/28642) suggests that melanocytes may engage with T-cells through a non-canonical mechanism, potentially acting as antigen-presenting cells or modulating T-cell activity through direct interaction, thereby shaping the local immune environment of the skin. * **Surprising Findings:** The identification of a T-cell receptor variable gene as a highly specific marker for a non-hematopoietic cell type challenges the conventional understanding of immune cell-specific gene expression and melanocyte function. * **Testable Questions:** Can [TRAV39](/details-gene/28642) protein be detected on the surface of primary human melanocytes, and does its silencing via siRNA alter the cytokine secretion profile of co-cultured T-cells? 2. **Hypothesis: A network of specific lncRNAs orchestrates the melanocyte's defense against environmental stressors.** The identity and survival of [melanocyte of skin](/details-cell/CL1000458) appear to be defined by a suite of lncRNAs (e.g., `TBC1D8 AS1`, `UXT AS1`). We hypothesize that this regulatory layer is crucial for fine-tuning the expression of critical cytoprotective genes like [GPX4](/details-gene/2879), thereby protecting the cell from UV-induced oxidative damage and subsequent ferroptosis. * **Surprising Findings:** The defining molecular signature of this cell type seems to be dominated by functionally uncharacterized non-coding RNAs rather than the canonical genes involved in melanin synthesis. This suggests that the regulatory control of the melanocyte phenotype is a key aspect of its specificity. * **Testable Questions:** Does antisense oligonucleotide-mediated knockdown of `TBC1D8 AS1` or `UXT AS1` in primary melanocytes lead to a down-regulation of [GPX4](/details-gene/2879) protein levels and a corresponding increase in sensitivity to ferroptosis-inducing agents like erastin or RSL3?