Details for: CL0000905

Cell ID: CL0000905

Cell Name: effector memory CD4-positive, alpha-beta T cell

Description: This cell type is compatible with the HIPC Lyoplate markers for 'effector memory CD4+ T cell', but includes additional markers known to be expressed on effector memory CD4+ T cells.

Synonyms: effector CD4-positive, alpha-beta memory T cell, effector CD4-positive, alpha-beta memory T lymphocyte, effector CD4-positive, alpha-beta memory T-cell, effector CD4-positive, alpha-beta memory T-lymphocyte, effector memory CD4-positive, alpha-beta T lymphocyte, effector memory CD4-positive, alpha-beta T-cell, effector memory CD4-positive, alpha-beta T-lymphocyte, effector memory CD4+ 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 effector memory CD4-positive, alpha-beta 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 effector memory CD4-positive, alpha-beta 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 effector memory CD4-positive, alpha-beta 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 effector memory CD4-positive, alpha-beta 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:  effector memory CD4-positive, alpha-beta T cell (CL0000905)

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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 [effector memory CD4-positive, alpha-beta T cell](/details-cell/CL0000905) is an antigen-experienced T lymphocyte subtype critical for long-term immunological memory. Based on its gene significance profile, this cell is characterized by a state of high metabolic readiness and translational priming. The most defining specific markers are not classical T-cell receptors or cytokines, but rather a suite of genes involved in mitochondrial respiration (e.g., [COX1](/details-gene/4512), [COX2](/details-gene/4513)) and protein synthesis (e.g., [TPT1](/details-gene/7178)). This molecular signature suggests a cell that is metabolically poised to execute rapid and potent effector functions upon re-encountering a specific antigen, fulfilling its role as a key component of the secondary immune response. ## Key Characteristics and Function Analysis of top marker genes, identified by expression specificity (**Overall** context), reveals several core functional clusters that define the biological state of the [effector memory CD4-positive, alpha-beta T cell](/details-cell/CL0000905). * **Metabolic Priming for Rapid Response:** A striking feature of this cell is the highly specific expression of numerous genes encoding components of the mitochondrial electron transport chain. This includes multiple cytochrome c oxidase subunits such as [COX1](/details-gene/4512), [COX2](/details-gene/4513), [COX7C](/details-gene/1350), and [COX4I1](/details-gene/1327), as well as [CYTB](/details-gene/4519) and ATP synthase subunit [ATP5F1E](/details-gene/514). This strong signature of mitochondrial activity suggests that the cell maintains a high capacity for oxidative phosphorylation. This metabolic state is consistent with the need for sustained energy production to support long-term survival in a quiescent state and to fuel rapid proliferation and effector function during a recall response. The high specificity of iron-storage proteins like [FTL](/details-gene/2512) and [FTH1](/details-gene/2495) further supports a cell primed for metabolic activity, as iron is a critical cofactor for respiratory enzymes. * **Translational Readiness:** The cell displays highly specific expression of a suite of genes essential for protein synthesis. The top marker, [TPT1](/details-gene/7178) (Translationally-controlled tumor protein), along with poly(A)-binding protein [PABPC1](/details-gene/26986) and elongation factors [EEF1D](/details-gene/1936) and [EEF1B2](/details-gene/1933), indicates that the translational machinery is a defining and active component of this cell's biology. This suggests that the cell is primed to rapidly synthesize large quantities of proteins, such as cytokines and other effector molecules, immediately following TCR stimulation, without the delay required for de novo transcription and translation of the machinery itself. * **Immune Interaction and Regulation:** While being a CD4+ T cell, this subset shows highly specific expression of components of the MHC class I pathway, including [B2M](/details-gene/567) (Beta-2-microglobulin) and the non-classical MHC molecule [HLA E](/details-gene/3133). The specific expression of [HLA E](/details-gene/3133), a ligand for the inhibitory NKG2A receptor on NK cells and some T cells, suggests a potential role for this cell in regulating other immune populations, possibly to temper bystander activation during a memory response. * **Signaling and Cytoskeletal Control:** Genes like [SARAF](/details-gene/51669), a regulator of store-operated calcium entry, and [CALM1](/details-gene/801), a key calcium-binding protein, underscore the cell's preparedness for calcium-dependent signaling cascades essential for T-cell activation. Additionally, [CFL1](/details-gene/1072) (Cofilin 1) and [MYL12A](/details-gene/10627), involved in actin dynamics, point to a capacity for motility and the formation of the immunological synapse. * **Anti-Markers:** The low specificity score for [IFNG](/details-gene/3458), a canonical Th1 effector cytokine, is notable. This does not imply the cell cannot produce it, but rather suggests that high-level *IFNG* transcript is not a defining feature of its resting memory state. Its expression is likely induced upon activation, differentiating the cell's potential from its constitutive state. Similarly, the low specificity of key inhibitory regulators like [PTPN6](/details-gene/5777) (SHP-1) and [SOCS1](/details-gene/8651) may indicate that the cell's quiescence is maintained by mechanisms other than high constitutive expression of these particular inhibitors. ## Clinical Significance and Contextual Roles The unique molecular profile of the [effector memory CD4-positive, alpha-beta T cell](/details-cell/CL0000905) has significant implications for its role in health and disease. Its state of metabolic and translational readiness makes it a cornerstone of effective, long-lasting immunity generated by vaccination and natural infection. The high expression of [TXNIP](/details-gene/10628), a protein that binds to and inhibits the antioxidant protein thioredoxin, is particularly relevant. [TXNIP](/details-gene/10628) is a critical node in linking cellular metabolism, redox status, and inflammation, and has been implicated in the activation of the NLRP3 inflammasome. Its specific expression in these cells may suggest a mechanism by which they can rapidly contribute to inflammatory responses upon reactivation, a process that could be beneficial in pathogen clearance but detrimental in chronic inflammatory or autoimmune conditions. Furthermore, the prominent signature of [HLA E](/details-gene/3133) expression suggests a sophisticated role in immune surveillance. In the context of viral infections, where classical MHC-I can be downregulated, these memory cells might use [HLA E](/details-gene/3133) to interact with and regulate NK cells, thereby orchestrating a more comprehensive recall response. In cancer, the status of [HLA E](/details-gene/3133) on these T cells within the tumor microenvironment could influence the anti-tumor activity of NK cells. The expression of the anti-proliferative gene [BTG1](/details-gene/694) highlights the tight regulation required to maintain this population in a controlled, quiescent state, a process that may be dysregulated in lymphoproliferative disorders. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The distinct transcriptional signature dominated by mitochondrial respiratory chain components ([COX1](/details-gene/4512), [COX2](/details-gene/4513), [CYTB](/details-gene/4519)) suggests that the long-term survival and rapid recall function of [effector memory CD4-positive, alpha-beta T cells](/details-cell/CL0000905) are critically dependent on maintaining a high constitutive level of oxidative phosphorylation capacity, providing a pre-established metabolic foundation for immediate action. * **Surprising Findings:** The overwhelming dominance of mitochondrial genes as specificity markers is striking, potentially outweighing classical immune surface markers in defining the cell's unique transcriptional state. This indicates that metabolic posture, rather than receptor expression alone, may be a primary determinant of the effector memory identity. * **Testable Questions:** How does targeted pharmacological inhibition of specific electron transport chain complexes affect the long-term persistence and antigen-specific recall potential of this cell population in a vaccination or chronic infection model? 2. **Hypothesis:** The highly specific expression of the non-classical MHC molecule [HLA E](/details-gene/3133) by [effector memory CD4-positive, alpha-beta T cells](/details-cell/CL0000905) serves as a key regulatory mechanism to directly modulate the activity of innate lymphocytes, particularly NK cells, during a secondary immune response. This interaction may function to limit bystander tissue damage and focus the cytotoxic response. * **Surprising Findings:** It is unexpected for a non-classical MHC-I molecule to be a top specificity marker for a CD4+ T helper cell subset. This suggests its function in this context is not merely for self-recognition but is an integral, active component of the cell's memory program, potentially shaping the behavior of the innate immune system. * **Testable Questions:** Does co-culture of activated [effector memory CD4-positive, alpha-beta T cells](/details-cell/CL0000905) with NK cells lead to a [HLA E](/details-gene/3133)-dependent suppression of NK cell cytotoxicity, and is this regulatory interaction abrogated by blocking the NKG2A/CD94 receptor on NK cells?