Details for: CL0000909

Cell ID: CL0000909

Cell Name: CD8-positive, alpha-beta memory T cell

Description: A CD8-positive, alpha-beta T cell that has differentiated into a memory T cell.

Synonyms: CD8-positive, alpha-beta memory T lymphocyte, CD8-positive, alpha-beta memory T-cell, CD8-positive, alpha-beta memory T-lymphocyte, T.8Mem.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 CD8-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 CD8-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 CD8-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 CD8-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:  CD8-positive, alpha-beta memory T cell (CL0000909)

 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 A [CD8-positive, alpha-beta memory T cell](/details-cell/CL0000909) is a differentiated T lymphocyte that provides long-term immunological memory and protection. The gene significance profile for this cell type **Overall** is dominated by genes integral to antigen presentation and T-cell mediated cytotoxicity, such as [B2M](/details-gene/567) and [HLA E](/details-gene/3133). This molecular signature underscores the cell's fundamental role in immune surveillance, where it is poised to rapidly recognize and eliminate cells presenting specific antigens, a hallmark of its function in recall responses to pathogens and tumors. ## Key Characteristics and Function The defining characteristics of [CD8-positive, alpha-beta memory T cells](/details-cell/CL0000909) are illuminated by several clusters of highly significant genes. * **Antigen Presentation and Cytotoxic Function:** The most prominent markers define the cell's core immunological function. The high specificity score for [B2M](/details-gene/567) (CSI: 95.82), a component of MHC class I molecules, is consistent with its role as a cytotoxic lymphocyte that interacts with other cells via these complexes. Similarly, the high significance of [HLA E](/details-gene/3133) (CSI: 93.77), a non-classical MHC class I molecule, highlights a specialized role in regulating immune responses, including T-cell mediated cytotoxicity. The presence of [CD3E](/details-gene/916) as a significant gene (PRS: 98.4%) further solidifies its identity as a T lymphocyte, being an essential component of the T-cell receptor complex. * **Metabolic Readiness and Longevity:** A striking feature is the high significance of numerous genes involved in cellular metabolism, suggesting a state of metabolic preparedness for rapid reactivation. This includes multiple mitochondrially-encoded genes of the respiratory chain, such as [COX1](/details-gene/4512) (CSI: 88.15), [COX2](/details-gene/4513) (CSI: 76.76), and [CYTB](/details-gene/4519) (CSI: 70.73). This is complemented by the high significance of genes involved in iron homeostasis like [FTL](/details-gene/2512) and [FTH1](/details-gene/2495), critical for the function of metabolic enzymes. The robust expression of genes for protein synthesis ([PABPC1](/details-gene/26986), [EEF1B2](/details-gene/1933)) and calcium signaling regulation ([CALM1](/details-gene/801), [SARAF](/details-gene/51669)) further points to the active maintenance required for a long-lived, quiescent but alert cell. * **Regulation of Quiescence:** The high significance of [BTG1](/details-gene/694) (CSI: 89.31), a known anti-proliferative gene, is particularly noteworthy. Its prominent role suggests it may be a key factor in maintaining the quiescent state of memory T cells, preventing inappropriate activation or exhaustion while preserving their potential for massive expansion upon antigen re-encounter. * **Cellular Identity Refinement:** The anti-marker profile helps define what this cell is not. The very low significance of the monocyte chemoattractant [CCL2](/details-gene/6347) (CSI: 2.75) clearly distinguishes it from myeloid lineages. Interestingly, while some subunits of the respiratory chain are top markers, others like [COX5B](/details-gene/1329) (CSI: -0.58) and [NDUFA4](/details-gene/4697) (CSI: -2.17) are anti-markers. This suggests a specific, finely-tuned metabolic configuration rather than a general upregulation of mitochondrial machinery. ## Clinical Significance and Contextual Roles **Overall**, the gene profile of [CD8-positive, alpha-beta memory T cells](/details-cell/CL0000909) has significant clinical implications, particularly in immunology, oncology, and infectious disease. The central role of antigen presentation machinery, highlighted by [B2M](/details-gene/567) and [HLA E](/details-gene/3133), places these cells at the nexus of anti-tumor immunity. Cancer cells frequently downregulate MHC class I components to evade detection, making the functional status of these molecules in both tumor and T cells a critical determinant of immunotherapy success. Furthermore, these memory cells appear to be active participants in shaping the immune microenvironment. The high significance of the chemokine [CCL5](/details-gene/6352) (CSI: 68.65), also known as RANTES, indicates that these cells can recruit other immune effectors to sites of inflammation or infection. This function is critical for a coordinated immune response but can also contribute to pathology in chronic inflammatory and autoimmune diseases. Notably, the discovery of a natural [CCL5](/details-gene/6352) variant that acts as a receptor antagonist highlights this pathway as a potential therapeutic target ([Link](https://doi.org/10.1007/s00251-006-0133-2)). The anti-proliferative gene [BTG1](/details-gene/694), identified as a key marker, is implicated in negatively regulating cell proliferation and is associated with certain B-cell leukemias ([Link](https://doi.org/10.1002/j.1460-2075.1992.tb05213.x)). Its high significance in these long-lived memory T cells suggests a potential role in maintaining T-cell homeostasis, which, if dysregulated, could contribute to lymphoproliferative disorders. ## Potential Mechanisms and Research Directions 1. **Hypothesis: [BTG1](/details-gene/694) is a critical rheostat for maintaining memory T-cell quiescence and preventing exhaustion.** The high significance of an anti-proliferative gene in a cell defined by its proliferative potential suggests it plays a crucial role in balancing readiness with self-preservation. We propose that [BTG1](/details-gene/694) actively suppresses the cell cycle, preserving the cell's metabolic resources and preventing the terminal differentiation associated with exhaustion, thereby ensuring long-term viability and a robust recall response. * **Surprising Findings:** It is paradoxical for a cell famed for its capacity for rapid and massive proliferation to be defined by a potent anti-proliferative gene. This suggests that the "memory" state is not passive but is an actively maintained, suppressed state. * **Testable Questions:** Does conditional deletion of [BTG1](/details-gene/694) in antigen-specific [CD8-positive, alpha-beta memory T cells](/details-cell/CL0000909) lead to a state of heightened basal activation, increased susceptibility to activation-induced cell death, or a compromised secondary response due to premature exhaustion? 2. **Hypothesis: [CD8-positive, alpha-beta memory T cells](/details-cell/CL0000909) possess a distinct, non-canonical composition of the mitochondrial electron transport chain optimized for survival and rapid reactivation.** The data reveal a striking dichotomy where certain cytochrome c oxidase subunits ([COX1](/details-gene/4512), [COX2](/details-gene/4513)) are highly significant markers, while others ([COX3](/details-gene/4514), [COX5B](/details-gene/1329)) are insignificant or anti-markers. This suggests that memory T cells do not simply have more mitochondria, but rather assemble specialized respiratory supercomplexes with a unique subunit stoichiometry. This specific configuration may be optimized to minimize reactive oxygen species (ROS) production during quiescence, thus enhancing longevity, while being primed for rapid metabolic ramping upon activation. * **Surprising Findings:** The metabolic profile of memory T cells appears to be qualitatively different, not just quantitatively greater, than that of other lymphocyte subsets. The selective expression of specific mitochondrial gene isoforms or subunits points to a level of metabolic specialization that has been previously underappreciated. * **Testable Questions:** Using high-resolution respirometry and proteomics, what is the precise stoichiometry of electron transport chain supercomplexes in naive, effector, and memory CD8+ T cells? Furthermore, does forced expression of the "non-preferred" subunit [COX3](/details-gene/4514) in memory T-cell precursors impair their long-term survival or recall potential in an adoptive transfer model?