Details for: CL0001050

Cell ID: CL0001050

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

Description: This cell type is compatible with the HIPC Lyoplate markers for 'effector CD8+ T cell'. The functional characteristics of this cell type currently undefined in CL, which affects its proper placement within the hierarchy.

Synonyms: effector CD8-positive, alpha-beta T lymphocyte, effector CD8-positive, alpha-beta T-cell, effector CD8-positive, alpha-beta T-lymphocyte, effector CD8+ 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 CD8-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 CD8-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 CD8-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 CD8-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 CD8-positive, alpha-beta T cell (CL0001050)

 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 The [effector CD8-positive, alpha-beta T cell](/details-cell/CL0001050), also known as an effector CD8+ T cell, is a terminally differentiated lymphocyte critical for the adaptive immune response. Based on gene significance analysis, this cell is defined by its highly specialized machinery for antigen presentation and T-cell-mediated cytotoxicity. The exceptional specificity scores (`csi_z`) for genes like [B2M](/details-gene/567) and [HLA E](/details-gene/3133) underscore its fundamental role in interacting with other cells via the MHC class I pathway. Concurrently, the prominence of genes involved in high-volume protein synthesis, cytoskeletal rearrangement, and chemokine production highlights its status as an active and mobile cell poised to eliminate target cells and orchestrate broader immune responses. ## Key Characteristics and Function **Overall**, the gene expression profile of the effector [CD8-positive, alpha-beta T cell](/details-cell/CL0001050) points to a cell that is metabolically active and primed for its cytotoxic and immunomodulatory roles. The top markers can be grouped into several key functional clusters: * **Antigen Presentation and Cytotoxicity:** The most defining characteristic is the expression of genes central to T-cell function. [B2M](/details-gene/567) (Beta-2-microglobulin), the top marker by specificity (CSI: 135.04), is an essential component of MHC class I molecules. This is complemented by the high specificity of [HLA E](/details-gene/3133), a non-classical MHC class I molecule involved in regulating the activity of [Natural Killer cells](/details-cell/CL0000623) and other T cells [Link](https://pubmed.ncbi.nlm.nih.gov/10064069/). The presence of effector molecule genes like [GNLY](/details-gene/10578) (Granulysin) and the canonical T-cell receptor component [CD3E](/details-gene/916) further solidifies its identity as a cytotoxic lymphocyte armed for target cell destruction [Link](https://pubmed.ncbi.nlm.nih.gov/2434598/). * **High Metabolic and Biosynthetic Activity:** A significant number of top markers are involved in fundamental cellular processes, suggesting a state of high metabolic demand. This includes genes for protein translation ([EEF1B2](/details-gene/1933), [EEF1D](/details-gene/1936)), protein turnover via the ubiquitin system ([UBC](/details-gene/7316)), and RNA processing ([PABPC1](/details-gene/26986), [DDX5](/details-gene/1655)). The high specificity of these "housekeeping" genes indicates that these processes are ramped up to an unusual degree in effector T-cells, likely to support the rapid synthesis of cytokines and cytotoxic granules. * **Cell Motility and Signaling:** Genes controlling the cytoskeleton, such as [CFL1](/details-gene/1072) (Cofilin 1) and [MYL6](/details-gene/4637), are highly specific, consistent with a cell that must actively migrate into tissues and form immunological synapses with target cells. Furthermore, the high specificity of the chemokine [CCL5](/details-gene/6352) indicates that these cells actively recruit other immune populations, such as monocytes and other lymphocytes, to the site of inflammation. * **Lineage Definition (Anti-Markers):** The cell's identity is further refined by the genes it does *not* express with high specificity. The low significance of the gamma-delta T-cell receptor gene [TRGV9](/details-gene/6983) confirms its alpha-beta lineage. Similarly, the low CSI for the myeloid/monocyte marker [CX3CR1](/details-gene/1524) distinguishes it clearly from other immune lineages. Notably, a large number of genes encoding subunits of the mitochondrial respiratory chain (e.g., [COX3](/details-gene/4514), [ATP6](/details-gene/4508), [NDUFA4](/details-gene/4697)) exhibit low or negative CSI values. This pattern is consistent with the known metabolic shift of effector T-cells toward aerobic glycolysis (the Warburg effect), which allows for the rapid generation of biosynthetic intermediates needed for proliferation and effector function. ## Clinical Significance and Contextual Roles The gene profile of the effector [CD8-positive, alpha-beta T cell](/details-cell/CL0001050) highlights its central role in immunity against viruses and cancer, as well as its potential contribution to autoimmune pathology. The analysis is based on an **Overall** context, providing a general blueprint of the cell's function. The high specificity of cytotoxic machinery components like [GNLY](/details-gene/10578) and antigen presentation molecules like [B2M](/details-gene/567) is fundamental to its role in immune surveillance. Dysregulation of these pathways is linked to immunodeficiency and cancer immune evasion. The expression of [CCL5](/details-gene/6352), a potent pro-inflammatory chemokine, implicates this cell as a key driver of inflammation. While essential for clearing pathogens, excessive [CCL5](/details-gene/6352) production by effector T-cells can contribute to the pathology of chronic inflammatory and autoimmune diseases. Similarly, the expression of [HLA E](/details-gene/3133) provides a potential link to immune regulation, as its interaction with the inhibitory receptor NKG2A can temper the activity of NK cells and other T-cells, suggesting a built-in mechanism to control the extent of the immune response. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The strong negative CSI for numerous mitochondrial oxidative phosphorylation (OXPHOS) genes (e.g., [COX3](/details-gene/4514), [NDUFA4](/details-gene/4697), [ATP6](/details-gene/4508)) combined with the high specificity of genes for protein synthesis and cytoskeletal dynamics suggests that effector [CD8-positive, alpha-beta T cell](/details-cell/CL0001050)s are metabolically reprogrammed to favor aerobic glycolysis over OXPHOS. This metabolic shift is likely essential to provide the rapid energy and biosynthetic precursors required for their demanding effector functions. * **Surprising Findings:** The sheer number of core mitochondrial components with negative specificity scores is striking. This strongly suggests that down-regulation of OXPHOS is not a passive consequence of activation but an active, defining feature of the effector state. * **Testable Questions:** How does targeted restoration of OXPHOS activity (e.g., through pharmacological agents) alter the production of [GNLY](/details-gene/10578) and [CCL5](/details-gene/6352) in activated effector CD8+ T-cells, and does it impact their long-term survival and transition into memory cells? 2. **Hypothesis:** The high co-specificity of both a direct cytotoxic molecule ([GNLY](/details-gene/10578)) and an immunoregulatory ligand ([HLA E](/details-gene/3133)) indicates that effector [CD8-positive, alpha-beta T cell](/details-cell/CL0001050)s possess a built-in, cell-intrinsic program to simultaneously execute effector functions and regulate bystander immune cells to fine-tune the local inflammatory environment. This dual-function capability may be crucial for balancing pathogen clearance with the prevention of excessive tissue damage. * **Surprising Findings:** It is notable that [HLA E](/details-gene/3133), often viewed in the context of NK cell regulation, is one of the most specific markers for this T-cell subset. This finding elevates its importance from a secondary function to a defining characteristic of this cell's interaction with its environment. * **Testable Questions:** Does the surface expression of [HLA E](/details-gene/3133) on effector [CD8-positive, alpha-beta T cell](/details-cell/CL0001050)s change dynamically upon encountering their cognate antigen, and does this change correlate with the magnitude of bystander [Natural Killer cell](/details-cell/CL0000623) activation or inhibition in the same microenvironment?