Details for: CL0011024

Cell ID: CL0011024

Cell Name: double negative T regulatory cell

Description: A double negative thymocyte that is CD3-positive, CD4-negative, CD8-negative, that that are present in the periphery in very low numbers and predominantly produce INF-gamma, TNF-alpha, and a low amount of TGF-beta, but not IL-2, IL-4, IL-10 or IL-13 upon activation.

Synonyms: CD4-negative, CD8-negative, alpha-beta regulatory T cells, DN Treg, double-negative alpha-beta regulatory T cell

Selected Context(s): Overall

Gene Significance Landscape

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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 double negative T regulatory 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 double negative T regulatory 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 double negative T regulatory 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 double negative T regulatory 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.

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Target Cell for CSI:  double negative T regulatory cell (CL0011024)

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Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
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 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 [double negative T regulatory cell](/details-cell/CL0011024) is a rare peripheral T lymphocyte subset defined by the absence of CD4 and CD8 co-receptors (CD3-positive, CD4-negative, CD8-negative). Based on its gene significance profile, this cell type appears to be a highly metabolically active effector cell with a distinct cytotoxic potential. The high specificity scores (`csi_z`) for genes involved in cytotoxicity, such as [GZMK](/details-gene/3003), and non-classical antigen presentation, like [HLA E](/details-gene/3133) and [B2M](/details-gene/567), suggest its identity is strongly tied to a state of effector readiness and immunomodulatory interaction, consistent with its described capacity to produce IFN-gamma and TNF-alpha. ## Key Characteristics and Function Analysis of the top defining gene markers for the [double negative T regulatory cell](/details-cell/CL0011024) reveals several core functional clusters. * **Cytotoxic Potential and Effector Function:** The high significance of Granzyme K ([GZMK](/details-gene/3003)), a serine protease found in the granules of cytotoxic lymphocytes, strongly indicates that these cells are equipped for direct cell-mediated cytotoxicity. This aligns with their described ability to produce pro-inflammatory and cytotoxic cytokines, suggesting they may regulate immune responses by eliminating target cells. * **Non-Classical Antigen Presentation:** The two most specific markers, [HLA E](/details-gene/3133) and its essential partner Beta-2-microglobulin ([B2M](/details-gene/567)), underscore a specialized role in cell-cell communication. [HLA E](/details-gene/3133) is a non-classical MHC class I molecule that presents a limited set of peptides and is primarily recognized by the inhibitory CD94/NKG2A receptor on NK cells and a subset of T cells. This suggests DN Tregs may directly regulate innate lymphocyte activity. * **High Metabolic Activity:** A large proportion of the top markers are components of the mitochondrial electron transport chain, including [COX1](/details-gene/4512), [COX2](/details-gene/4513), [CYTB](/details-gene/4519), [ATP5F1E](/details-gene/514), and [COX4I1](/details-gene/1327). The high specificity of these genes suggests that a state of elevated oxidative phosphorylation is a defining characteristic of DN Tregs, likely required to fuel their energy-intensive effector functions such as granule exocytosis and cytokine synthesis. * **Cellular Motility and Signaling:** Genes associated with the cytoskeleton ([MYL12A](/details-gene/10627), [CFL1](/details-gene/1072), [MYL6](/details-gene/4637)) and calcium signaling regulation ([SARAF](/details-gene/51669), [CALM1](/details-gene/801)) are also prominent. This profile is consistent with a motile immune cell capable of migrating to sites of inflammation and responding to activation signals. **Overall**, the anti-marker profile confirms the cell's identity and state. The lack of significance for the early activation marker [CD69](/details-gene/969) and numerous interferon-stimulated genes ([MX1](/details-gene/4599), [STAT1](/details-gene/6772), [ISG15](/details-gene/9636)) suggests that in this baseline context, the cells are in a quiescent but poised state, rather than being actively engaged in an acute antiviral response. Critically, the absence of a significant signal for [CD8B](/details-gene/926) serves as a robust internal validation of the cell's "double negative" phenotype. ## Clinical Significance and Contextual Roles The gene signature of [double negative T regulatory cells](/details-cell/CL0011024) points toward a complex "regulatory" role that may be executed via direct cytotoxicity, differing from the suppressive mechanisms of conventional FoxP3+ regulatory T cells. Their potent cytotoxic machinery, marked by [GZMK](/details-gene/3003), suggests a capacity to control immune responses by eliminating over-activated T cells, antigen-presenting cells, or potentially transformed cells, thereby functioning as immune-contracting cells after an inflammatory event. The unique and highly specific expression of [HLA E](/details-gene/3133) positions these cells at the interface of innate and adaptive immunity. In cancer, tumor cells often upregulate [HLA E](/details-gene/3133) to engage inhibitory NKG2A receptors on NK cells and CD8+ T cells, facilitating immune escape. The constitutive high expression of [HLA E](/details-gene/3133) on DN Tregs suggests they could play a sophisticated role in the tumor microenvironment, either by contributing to an inhibitory milieu or by competing with tumor cells for receptor engagement on other effector cells. Understanding how this cell population behaves in healthy versus diseased tissue is critical for clarifying its contribution to immune homeostasis and pathology. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** DN Tregs primarily exert their regulatory function through targeted, [GZMK](/details-gene/3003)-mediated cytotoxicity against other activated immune cells, a process fueled by a distinct and constitutively high metabolic rate reliant on oxidative phosphorylation. * **Surprising Findings:** The most defining markers of this "regulatory" cell are not canonical suppressive molecules but rather a triad of cytotoxicity ([GZMK](/details-gene/3003)), non-classical antigen presentation ([HLA E](/details-gene/3133)), and a profound metabolic signature (e.g., [COX1](/details-gene/4512), [ATP5F1E](/details-gene/514)). This suggests their functional identity is defined by a pre-loaded effector program rather than an induced state. * **Testable Questions:** In an in vitro suppression assay, does the specific inhibition of granzyme K activity abrogate the ability of DN Tregs to control the proliferation of conventional CD4+ or CD8+ T cells? 2. **Hypothesis:** The highly specific expression of the non-classical MHC molecule [HLA E](/details-gene/3133) indicates that a primary function of DN Tregs is the direct modulation of innate immune cells, particularly NK cells, through interaction with the CD94/NKG2A receptor. * **Surprising Findings:** The dominance of [HLA E](/details-gene/3133) as a top-ranked marker over any classical MHC-I or MHC-II molecules suggests that the cell's most specific interactive function may be independent of foreign peptide antigen presentation, relying instead on a more generalized "licensing" or inhibitory signal. * **Testable Questions:** Does the addition of DN Tregs to an NK cell cytotoxicity assay alter the killing of target cells, and can this effect be reversed by an antibody blockade of the [HLA E](/details-gene/3133)-NKG2A axis?