Details for: CL0000897

Cell ID: CL0000897

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

Description: A CD4-positive, alpha-beta T cell that has differentiated into a memory T cell.

Synonyms: CD4-positive, alpha-beta memory T lymphocyte, CD4-positive, alpha-beta memory T-cell, CD4-positive, alpha-beta memory T-lymphocyte, T4.Mem.Sp

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 CD4-positive, alpha-beta memory 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 CD4-positive, alpha-beta memory 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 CD4-positive, alpha-beta memory 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 CD4-positive, alpha-beta memory 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:  CD4-positive, alpha-beta memory T cell (CL0000897)

 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 The [CD4-positive, alpha-beta memory T cell](/details-cell/CL0000897) is an adaptive immune cell critical for long-term immunological memory. Analysis of its gene significance profile in the **Overall** context reveals a cell in a state of metabolic poise and readiness. Its identity is defined by the specific expression of core T-cell lineage markers such as [CD3E](/details-gene/916) and T-cell receptor components, alongside a unique suite of genes involved in mitochondrial respiration, such as [B2M](/details-gene/567) and multiple cytochrome c oxidase subunits. This suggests a metabolic configuration optimized for longevity and rapid recall. Furthermore, the high specificity of genes controlling RNA processing and protein synthesis, like [PABPC1](/details-gene/26986), indicates that these cells maintain a specialized translational machinery, likely enabling swift deployment of effector functions upon re-exposure to a cognate antigen. ## Key Characteristics and Function Based on its most uniquely expressed genes (high `csi_z`), the function of the [CD4-positive, alpha-beta memory T cell](/details-cell/CL0000897) can be understood through several key biological themes. * **T-Cell Lineage and Immune Surveillance:** The cell's identity is unequivocally confirmed by the high significance of T-cell receptor complex components, including [CD3E](/details-gene/916) and [TRBC1](/details-gene/28639). Additionally, the high specificity of genes involved in antigen presentation, such as [B2M](/details-gene/567) and [HLA E](/details-gene/3133), underscores its active role in the immune system, where it interacts with and is regulated by other immune cells through MHC-I-dependent pathways. The presence of [KLRB1](/details-gene/3820) as a specific marker may indicate a subset with functions overlapping those of NK cells or specialized inflammatory roles. * **Metabolic Poise for Longevity and Recall:** A prominent feature of this cell is the specific expression of numerous genes related to oxidative phosphorylation (OXPHOS). This includes multiple subunits of the cytochrome c oxidase complex, such as [COX4I1](/details-gene/1327), [COX1](/details-gene/4512), and [COX7C](/details-gene/1350), as well as the mitochondrial protein import gene [TOMM7](/details-gene/54543). This metabolic signature is consistent with the established understanding that memory T cells rely on efficient mitochondrial respiration for long-term survival and to fuel rapid proliferation during a recall response ([Link](https://doi.org/10.1038/nature08202)). * **Specialized Translational and Post-Transcriptional Control:** The data highlight a unique pattern of genes involved in RNA and protein synthesis. The high specificity of the poly(A)-binding protein [PABPC1](/details-gene/26986) and translation elongation factors [EEF1D](/details-gene/1936) and [EEF1B2](/details-gene/1933) suggests that the translational apparatus is a key defining feature. This could reflect a state of 'translational readiness,' where the cell is primed to rapidly synthesize effector proteins from pre-existing mRNA templates upon activation. * **Signal Transduction and Cytoskeletal Regulation:** Specific expression of genes like [SARAF](/details-gene/51669), which modulates store-operated calcium entry, and the calcium-binding protein [S100A6](/details-gene/6277), points to fine-tuned regulation of calcium signaling, a critical secondary messenger in T-cell activation. Concurrently, markers like [CFL1](/details-gene/1072) (cofilin) and [MYL12A](/details-gene/10627) (myosin light chain) indicate a specialized machinery for controlling cytoskeletal dynamics, essential for cell migration and the formation of the immunological synapse. The anti-marker profile provides critical counterpoints. The negative CSI for several other mitochondrial genes, including different cytochrome c oxidase subunits ([COX6C](/details-gene/1345), [COX5B](/details-gene/1329)) and NADH dehydrogenase subunits ([ND4](/details-gene/4538)), presents a compelling paradox. This may indicate that [CD4-positive, alpha-beta memory T cells](/details-cell/CL0000897) utilize a highly specific and potentially customized composition of their respiratory chain complexes. Similarly, the low specificity of certain ubiquitin-related genes ([UBB](/details-gene/7314), [SKP1](/details-gene/6500)) and the lncRNA [NEAT1](/details-gene/283131) further delineates the cell's unique molecular landscape. ## Clinical Significance and Contextual Roles **Overall**, the [CD4-positive, alpha-beta memory T cell](/details-cell/CL0000897) is a cornerstone of adaptive immunity, providing long-lasting protection following infection or vaccination. Its gene signature reflects this role as a long-lived, quiescent, yet highly responsive sentinel. The distinct metabolic profile, characterized by the specific expression of a select set of OXPHOS genes, is clinically relevant. The dependency of memory T cells on mitochondrial respiration is a key area of research in immunotherapy. Manipulating T-cell metabolism can enhance the efficacy of cancer treatments or dampen pathogenic responses in autoimmune diseases. The gene set identified here ([COX4I1](/details-gene/1327), [COX1](/details-gene/4512), etc.) could represent potential targets for modulating memory T-cell function and survival. The high specificity of [KLRB1](/details-gene/3820) (CD161) is also of interest, as CD161-positive CD4+ T cells have been associated with pro-inflammatory subsets, such as Th17 cells, which play critical roles in mucosal immunity but are also implicated in autoimmune conditions like inflammatory bowel disease and rheumatoid arthritis. The unique expression of this gene suggests that this dataset may be enriched for such functionally specialized memory cell subsets. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The dichotomous significance scores for mitochondrial respiratory chain subunits (i.e., some being top markers while others are anti-markers) suggest that [CD4-positive, alpha-beta memory T cells](/details-cell/CL0000897) assemble respiratory supercomplexes with a unique, non-canonical stoichiometry. This specific configuration may be structurally optimized to enhance stability and efficiency for long-term, low-level ATP production, favoring cell survival over maximal respiratory output, a state that is reversed upon activation. * **Surprising Findings:** It is highly unexpected to find genes encoding different subunits of the same essential molecular machine (e.g., Complex IV/cytochrome c oxidase) at opposite ends of the significance spectrum. This challenges the assumption of a uniform expression program for core metabolic pathways and points toward profound cell-type-specific regulation at the individual subunit level. * **Testable Questions:** Can blue native PAGE followed by mass spectrometry reveal a different stoichiometric ratio of subunits like [COX4I1](/details-gene/1327) versus [COX6C](/details-gene/1345) within the respiratory supercomplexes of quiescent memory T cells compared to naive or effector T cells? 2. **Hypothesis:** The high expression specificity of key translational machinery genes, including [PABPC1](/details-gene/26986), [EEF1D](/details-gene/1936), and [EEF1B2](/details-gene/1933), indicates that memory T cells exist in a state of 'translational poise'. In this state, mRNAs encoding critical effector proteins (e.g., cytokines, cytotoxic molecules) are stored in a stable, translationally repressed form, bound by a specialized set of RNA-binding proteins, allowing for an immediate burst of protein synthesis upon antigen re-encounter that precedes de novo transcription. * **Surprising Findings:** While metabolic readiness is a known feature of memory T cells, the discovery that general translational machinery components are among the most specific markers is novel. It implies that the *regulation of protein synthesis itself*, rather than just transcriptional potential, is a uniquely defining and perhaps rate-limiting step in the memory T cell recall response. * **Testable Questions:** Does ribosome profiling (Ribo-Seq) analysis of quiescent versus recently activated memory T cells identify a class of mRNAs that show a dramatic increase in translational efficiency without a corresponding immediate increase in transcript abundance?