Details for: CL0002419

Cell ID: CL0002419

Cell Name: mature T cell

Description: A T cell that expresses a T cell receptor complex and has completed T cell selection.

Synonyms: CD3e-positive T cell, CD3epsilon T cell, mature T-cell

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

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for mature 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 mature 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 mature 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 mature 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:  mature T cell (CL0002419)

 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 [mature T cell](/details-cell/CL0002419) is a differentiated lymphocyte that has successfully completed thymic selection and expresses a functional T cell receptor complex. The gene significance profile for this cell type reveals a state of metabolic and functional readiness. The most defining markers are genes essential for constitutive cellular processes, including MHC class I-mediated antigen presentation ([B2M](/details-gene/567), [HLA E](/details-gene/3133)), high-capacity energy production through oxidative phosphorylation (e.g., [ND2](/details-gene/4536), [COX1](/details-gene/4512)), and robust protein synthesis machinery ([TPT1](/details-gene/7178)). This molecular signature suggests that [mature T cells](/details-cell/CL0002419) are not merely quiescent but are actively maintained in a state prepared for rapid activation and deployment of effector functions upon antigen encounter. ## Key Characteristics and Function **Overall**, the gene expression landscape of a [mature T cell](/details-cell/CL0002419) is dominated by genes underpinning its core immunological and metabolic functions. These can be grouped into several key biological themes: * **Antigen Presentation and Immune Interaction:** The highest significance score belongs to [B2M](/details-gene/567) (CSI: 130.65), an essential component of all MHC class I molecules. This, along with the high significance of [HLA E](/details-gene/3133), underscores the central role of MHC class I-mediated interactions for this cell type, which includes both cytotoxic T lymphocyte (CTL) killing and regulatory interactions. The high expression of the chemokine receptor [CXCR4](/details-gene/7852) further highlights the cell's capacity for trafficking and homing to specific tissues. * **High Metabolic Capacity:** A striking feature is the prominence of genes involved in mitochondrial respiration. Multiple subunits of the electron transport chain, including [ND2](/details-gene/4536), [COX1](/details-gene/4512), [COX2](/details-gene/4513), [COX4I1](/details-gene/1327), and components of ATP synthase like [ATP5F1E](/details-gene/514) and [ATP5MG](/details-gene/10632), are among the top markers. This is consistent with a cell that is metabolically poised to meet the high energetic demands of clonal expansion, cytokine production, and cytotoxic activity following activation. * **Robust Protein Synthesis and Housekeeping:** The cell maintains a strong machinery for protein production and processing. Significant genes include translationally controlled tumor protein ([TPT1](/details-gene/7178)), nucleophosmin ([NPM1](/details-gene/4869)), RNA helicase [DDX5](/details-gene/1655), and several elongation factors ([EEF1B2](/details-gene/1933), [EEF1D](/details-gene/1936)). This readiness to synthesize proteins is critical for producing effector molecules such as cytokines and granzymes. * **Regulation of Cell State:** The high significance of the anti-proliferative gene [BTG1](/details-gene/694) suggests that a key feature of the mature state is the active maintenance of quiescence, preventing inappropriate proliferation while the cell circulates. This is balanced by key signaling components like calmodulin ([CALM1](/details-gene/801)), which is essential for transducing calcium signals that initiate T cell activation. * **Least Significant Markers:** The negative or very low CSI scores for genes like [GSTP1](/details-gene/2950) and [PRDX1](/details-gene/5052) suggest that pathways related to specific types of oxidative stress response are not defining features of the general mature T cell state. Interestingly, [CD8B](/details-gene/926) shows a low CSI, which may reflect the fact that the "[mature T cell](/details-cell/CL0002419)" population is a composite of both CD4-positive and CD8-positive T cells, thereby diluting the specific signal of this CD8-lineage marker. ## Clinical Significance and Contextual Roles The gene signature of [mature T cells](/details-cell/CL0002419) has direct implications for immunology, oncology, and infectious disease. The high relevance of [B2M](/details-gene/567) highlights a critical mechanism of tumor immune evasion. Loss-of-function mutations in [B2M](/details-gene/567) prevent MHC class I surface expression, rendering cancer cells invisible to cytotoxic T lymphocytes. Consequently, the [B2M](/details-gene/567) status is an important biomarker for predicting response to immune checkpoint inhibitors. The chemokine receptor [CXCR4](/details-gene/7852) is a well-established co-receptor for HIV entry into T cells, making it a key therapeutic target in HIV/AIDS research. Furthermore, its role in cell migration implicates it in the metastasis of various cancers, where tumor cells can hijack the CXCL12/[CXCR4](/details-gene/7852) axis to invade new tissues. The anti-proliferative gene [BTG1](/details-gene/694) has been identified as a tumor suppressor involved in chromosomal translocations in B-cell malignancies ([Link](https://doi.org/10.1002/j.1460-2075.1992.tb05213.x)). Its high significance in T cells suggests it likely plays a crucial role in preventing T-cell lymphoproliferative disorders and may be dysregulated in T-cell leukemias and lymphomas. The significant expression of [HMGB1](/details-gene/3146) indicates that mature T cells are a potential source of this potent pro-inflammatory alarmin. When released from activated or dying T cells, [HMGB1](/details-gene/3146) can act as a damage-associated molecular pattern (DAMP), amplifying inflammatory responses in tissues, a process relevant to autoimmune diseases and acute sterile inflammation. ## Potential Mechanisms and Research Directions 1. **Hypothesis: Mature T cells exist in a state of "metabolic pre-activation," enabling rapid effector function.** The gene signature is dominated by components of oxidative phosphorylation (e.g., [COX1](/details-gene/4512), [ND2](/details-gene/4536)) and protein translation machinery ([TPT1](/details-gene/7178), [EEF1B2](/details-gene/1933)). We hypothesize that this high constitutive expression does not reflect a simple housekeeping function but rather maintains the cell in a metabolically poised state. This "pre-activation" would allow for an immediate and robust response to T-cell receptor (TCR) stimulation, bypassing a significant lag phase that would be required to build this machinery from a lower baseline. * **Surprising Findings:** For cells that are largely quiescent and circulating, the extremely high significance of genes related to energy production and protein synthesis is unexpected. This challenges the model of naive T cells as metabolically dormant and suggests that maintaining this state of readiness is itself an energy-intensive process. * **Testable Questions:** If naive [mature T cells](/details-cell/CL0002419) are treated with inhibitors of oxidative phosphorylation or protein synthesis *before* TCR stimulation, is their subsequent ability to proliferate, differentiate, and secrete cytokines significantly blunted or delayed compared to untreated controls? 2. **Hypothesis: A transcriptional balance between quiescence ([BTG1](/details-gene/694)) and surveillance ([CXCR4](/details-gene/7852)) defines the mature T cell state.** The co-expression of the anti-proliferative transcription coregulator [BTG1](/details-gene/694) and the critical homing receptor [CXCR4](/details-gene/7852) suggests a fundamental regulatory axis. We propose that [BTG1](/details-gene/694) enforces a state of proliferative arrest, which is essential for preventing autoimmunity and maintaining a diverse repertoire, while [CXCR4](/details-gene/7852) ensures the cell can effectively patrol secondary lymphoid organs for its cognate antigen. Disruption of this balance could lead to immunopathology. * **Surprising Findings:** The presence of a potent anti-proliferative gene like [BTG1](/details-gene/694) among the most significant markers for a cell renowned for its capacity for clonal expansion is paradoxical. It highlights that the default state of a mature T cell is one of active restraint. * **Testable Questions:** Does conditional knockout of [BTG1](/details-gene/694) in the T-cell lineage lead to increased homeostatic proliferation, a lower threshold for activation, or altered trafficking patterns in response to CXCL12 gradients in vivo?