Details for: CL0000815

Cell ID: CL0000815

Cell Name: regulatory T cell

Description: This cell type may express FoxP3 and CD25 and secretes IL-10 and TGF-beta.

Synonyms: Treg, regulatory T lymphocyte, regulatory T-cell, regulatory T-lymphocyte, suppressor T cell, suppressor T lymphocyte, suppressor T-cell, suppressor T-lymphocyte

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 regulatory T 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 regulatory T 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 regulatory T 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 regulatory T 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:  regulatory T cell (CL0000815)

 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 [regulatory T cell](/details-cell/CL0000815) (Treg) is a specialized T lymphocyte subtype classically defined by its role in immune suppression, often mediated by the expression of [FOXP3](/details-gene/50943) and the secretion of cytokines such as IL-10 and TGF-beta. However, analysis of its gene expression signature using specificity-based metrics (**Overall**) reveals a more complex identity. This cell's unique transcriptional profile is dominated by a diverse array of poorly characterized protein-coding genes (e.g., [NUTM2D](/details-gene/728130)), long non-coding RNAs (e.g., `UXT AS1`), and antisense transcripts. Notably, while genes associated with T-cell identity ([TRAV39](/details-gene/28642)) and immune interaction ([B2M](/details-gene/567), [HLA E](/details-gene/3133)) are present, the canonical marker [FOXP3](/details-gene/50943) displays a surprisingly low cell significance index. This suggests that the identity of this particular Treg population may be maintained by a transcriptional network less reliant on high levels of [FOXP3](/details-gene/50943) and more defined by unconventional metabolic and signaling molecules. ## Key Characteristics and Function **Overall**, the gene signature of this [regulatory T cell](/details-cell/CL0000815) points toward a specialized and non-canonical functional state. Its identity appears to be built upon several distinct functional pillars: * **Dominance of Non-coding and Uncharacterized Loci:** The most specific markers for this cell type are not well-known immune genes but rather uncharacterized loci such as `LOC105374114` and non-coding RNAs like `UXT AS1` and `LINC02877`. This high specificity (CSI Z-scores > 100) suggests these transcripts are fundamental to defining this cell's unique state and may play critical roles in its epigenetic regulation or function. * **Core T-cell and Immune Interaction Machinery:** The presence of [TRAV39](/details-gene/28642), a T-cell receptor alpha variable gene, confirms its T-cell lineage. Additionally, high specificity for [B2M](/details-gene/567) and the non-classical MHC molecule [HLA E](/details-gene/3133) suggests active participation in antigen presentation pathways and potential interactions with other immune cells, such as NK cells, which recognize [HLA E](/details-gene/3133). * **Specialized Metabolic and Developmental Profile:** A unique characteristic of this cell is the high significance of genes not typically associated with lymphocyte function. [UGT1A8](/details-gene/54576), a UDP-glucuronosyltransferase involved in metabolizing xenobiotics and endogenous compounds, is a prominent marker. Its expression is typically associated with extrahepatic tissues like the colon ([Link](https://pubmed.ncbi.nlm.nih.gov/9535849/)), suggesting this Treg may be adapted to a specific tissue microenvironment where it performs detoxification or metabolic modulation. Furthermore, the expression of [GDF3](/details-gene/9573), a growth differentiation factor involved in embryonic development, is unexpected and may indicate a role in tissue homeostasis or repair. The high significance of [FTL](/details-gene/2512) (ferritin light chain) also points to a specialized role in iron metabolism and managing oxidative stress. * **Lack of Canonical Treg and Activation Markers:** The most striking observation is the low significance score for the master regulator [FOXP3](/details-gene/50943), which appears in the "Anti_Markers" list. This indicates that while [FOXP3](/details-gene/50943) may be expressed, its expression is not a uniquely defining feature of this cell population compared to others in this dataset. This finding challenges the classical definition and suggests the existence of Treg subtypes where suppressive function is maintained by alternative mechanisms. The low significance of the immediate early gene [FOS](/details-gene/2353) is consistent with a non-acutely-activated or resting state. Finally, the absence of effector cytokine genes like [IL17F](/details-gene/112744) reinforces its identity as a regulatory, rather than pro-inflammatory, T cell. ## Clinical Significance and Contextual Roles The unique gene expression profile of this [regulatory T cell](/details-cell/CL0000815) suggests potential roles in tissue-specific immunity and metabolism. The high specificity of [UGT1A8](/details-gene/54576) is particularly noteworthy. UGT enzymes are critical for drug metabolism and the detoxification of environmental toxins, particularly in the gastrointestinal tract ([Link](https://pubmed.ncbi.nlm.nih.gov/9535849/)). The presence of [UGT1A8](/details-gene/54576) as a defining marker could implicate this Treg population in mediating the interface between the host immune system and the gut metabolome, including dietary components, microbial byproducts, and pharmaceuticals. Dysregulation of such a cell could contribute to inflammatory bowel disease or affect local drug efficacy. The expression of [GDF3](/details-gene/9573), a member of the TGF-beta superfamily, suggests a potential role beyond classical immune suppression, possibly extending to tissue regeneration, fibrosis, or developmental mimicry in cancer. Similarly, the prion-related protein [PRND](/details-gene/23627), also a top marker, has been implicated in neurodegenerative processes ([Link](https://pubmed.ncbi.nlm.nih.gov/10525406/)), hinting at potential, though highly speculative, roles for Tregs in neurological contexts. The most profound clinical implication arises from the low specificity of [FOXP3](/details-gene/50943). If a stable, suppressive Treg population exists that is not defined by high [FOXP3](/details-gene/50943) expression, it could be missed by conventional biomarker panels. Understanding the biology of such cells is critical for accurately monitoring immune status and for the development of targeted immunotherapies, as these cells may respond differently to treatments aimed at modulating canonical Tregs. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** This dataset has identified a distinct subtype of [regulatory T cell](/details-cell/CL0000815) whose lineage stability and suppressive function are not primarily dependent on high, specific expression of the canonical transcription factor [FOXP3](/details-gene/50943). Instead, its identity may be programmed and maintained by a network of highly specific non-coding RNAs, such as `UXT AS1`, which regulate its unique metabolic and signaling profile. * **Surprising Findings:** The master regulator of Treg identity, [FOXP3](/details-gene/50943), is not a specific marker for this cell population. The cell's transcriptional identity is instead dominated by numerous uncharacterized non-coding RNAs and loci. * **Testable Questions:** Does CRISPR-mediated inhibition of the top non-coding RNAs, such as `UXT AS1` or `LINC02877`, in these cells lead to a loss of suppressive capacity or a shift in cellular identity (e.g., increased inflammatory cytokine production), even if [FOXP3](/details-gene/50943) expression levels are unperturbed? 2. **Hypothesis:** This [regulatory T cell](/details-cell/CL0000815) population is specialized for tissue residency in a metabolically active, non-lymphoid environment, such as the gut mucosa. Its primary function in this niche may be to maintain local homeostasis by detoxifying environmental metabolites via [UGT1A8](/details-gene/54576) and contributing to tissue integrity through the expression of developmental factors like [GDF3](/details-gene/9573). * **Surprising Findings:** Key markers for this T cell are genes typically associated with liver and colon drug metabolism ([UGT1A8](/details-gene/54576)) and embryonic development ([GDF3](/details-gene/9573)), rather than classical immunological pathways. * **Testable Questions:** Using spatial transcriptomics or multiplex imaging on human tissue sections, can this specific Treg population, defined by co-expression of markers like [TRAV39](/details-gene/28642) and [UGT1A8](/details-gene/54576), be localized to specific niches such as the intestinal epithelium? Furthermore, is the suppressive activity of these cells modulated by exposure to known [UGT1A8](/details-gene/54576) substrates?