Details for: CL0000939

Cell ID: CL0000939

Cell Name: CD16-positive, CD56-dim natural killer cell, human

Description: This cell type is compatible with the HIPC Lyoplate markers for 'CD16+CD56+ NK cell'. Markers are associated with human cell types.

Synonyms: CD16-positive, CD56-dim NK cell, CD16-positive, CD56-low NK cell, CD16-positive, CD56-low natural killer cell, CD16-positive, CD56-positive NK cell, CD16-positive, CD56-positive natural killer cell, cytotoxic CD56-dim NK cell, cytotoxic CD56-dim natural killer cell, CD16+CD56+ NK cell

Selected Context(s): Overall

Gene Significance Landscape

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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 CD16-positive, CD56-dim natural killer cell, human 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 CD16-positive, CD56-dim natural killer cell, human. 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 CD16-positive, CD56-dim natural killer cell, human. 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 CD16-positive, CD56-dim natural killer cell, human. 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:  CD16-positive, CD56-dim natural killer cell, human (CL0000939)

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Nodes (Genes):
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Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
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 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 [CD16-positive, CD56-dim natural killer cell, human](/details-cell/CL0000939) is a major cytotoxic lymphocyte subpopulation critical to the innate immune system. Characterized by high expression of the Fc receptor CD16 and low expression of the neural cell adhesion molecule CD56, this cell type is primed for antibody-dependent cellular cytotoxicity (ADCC). The analysis of its gene significance profile in the **Overall** context reveals a cell defined by a unique and highly specific expression of MHC class I-related molecules, particularly [HLA E](/details-gene/3133) and its partner [B2M](/details-gene/567). This suggests that self-monitoring and interaction with other immune cells via these pathways are core to its identity. Furthermore, a strong signature of genes involved in high metabolic activity, protein synthesis, and cytoskeletal dynamics portrays a cell in a state of constant readiness, poised for rapid effector function. ## Key Characteristics and Function Based on the Z-score analysis, which emphasizes expression specificity, the functional identity of the [CD16-positive, CD56-dim natural killer cell, human](/details-cell/CL0000939) can be organized into several core biological themes. * **Immune Recognition and Cytotoxicity Machinery:** The most specific markers, [HLA E](/details-gene/3133) and [B2M](/details-gene/567), are central to the MHC class I pathway. [HLA E](/details-gene/3133) expression is particularly noteworthy, as it presents peptides from other classical HLA molecules and engages inhibitory receptors on NK cells, thus serving as a key checkpoint for immune surveillance ([Link](https://pubmed.ncbi.nlm.nih.gov/3260916/)). Its high specificity *within* this NK cell subset suggests a potential role in self-regulation or cell-cell communication. This cell is armed for direct killing, evidenced by the high significance of [PRF1](/details-gene/5551), the gene encoding the pore-forming protein perforin. The profile is further defined by key leukocyte signaling molecules such as [PTPRC](/details-gene/5788) (CD45) and [CD7](/details-gene/924), underscoring its lymphoid lineage and role in the adaptive immune response. * **High Metabolic and Biosynthetic State:** A prominent feature of this cell type is a strong signature of genes related to energy production and cellular metabolism. Multiple mitochondrial genes, including [COX1](/details-gene/4512), [COX2](/details-gene/4513), [CYTB](/details-gene/4519), and [ND5](/details-gene/4540), are among the top markers. This indicates a high reliance on oxidative phosphorylation, consistent with a cell that must maintain a high state of readiness to fuel energetically demanding processes like cytotoxicity and cytokine secretion. This is complemented by the high specificity of genes involved in protein synthesis and turnover, such as the translationally controlled tumor protein [TPT1](/details-gene/7178), the ubiquitin gene [UBB](/details-gene/7314), elongation factor [EEF1D](/details-gene/1936), and the RNA helicase [DDX5](/details-gene/1655). * **Cytoskeletal Dynamics and Intracellular Signaling:** The cell's capacity for motility, adhesion, and degranulation is highlighted by the specific expression of genes controlling the actin cytoskeleton, such as [CFL1](/details-gene/1072) (cofilin), [MYL12A](/details-gene/10627), and [MYL6](/details-gene/4637) (myosin light chains). These are essential for forming the immunological synapse with target cells and releasing cytotoxic granules. This is coupled with significant expression of key signaling intermediaries like [CALM1](/details-gene/801) (calmodulin) and [YWHAZ](/details-gene/7534) (14-3-3 protein), suggesting that calcium-dependent and protein-scaffolding signaling pathways are constitutively important. * **Anti-Markers:** The analysis of least significant genes provides further clarity. The low specificity score for genes like [KIR2DL3](/details-gene/3804) and [SIGLEC7](/details-gene/27036), which encode other known NK cell receptors, may suggest that their expression is not uniquely high in this subset compared to other immune cells, or that their expression is more variable and thus not a stable defining feature in the **Overall** context. ## Clinical Significance and Contextual Roles The [CD16-positive, CD56-dim natural killer cell, human](/details-cell/CL0000939) is a primary effector in anti-tumor and anti-viral immunity. Its gene expression profile from the **Overall** context underscores its established roles and points to potential areas of clinical relevance. The cell's defining feature is its potent cytotoxic capability, which is directly supported by high-specificity markers like [PRF1](/details-gene/5551). This function is central to its role in destroying virally infected cells and cancer cells. Clinically, the activity of this cell population is crucial for the efficacy of monoclonal antibody therapies (e.g., Rituximab, Trastuzumab), which operate through ADCC mediated by the CD16 receptor. The observed high metabolic state, evidenced by the suite of mitochondrial gene markers ([COX1](/details-gene/4512), [COX2](/details-gene/4513), etc.), suggests that therapeutic strategies aimed at boosting cellular metabolism could potentially enhance NK cell-based immunotherapies. The highly specific expression of [HLA E](/details-gene/3133) and [B2M](/details-gene/567) within these NK cells is intriguing. While NK cells are known to target cells that have lost classical HLA expression, the prominent role of [HLA E](/details-gene/3133) as a marker *of* the NK cell itself is less understood. This could imply a mechanism of self-regulation where NK cells use [HLA E](/details-gene/3133) expression to prevent fratricide or to communicate with other immune cells. Dysregulation of this axis could have implications in autoimmune diseases or cancer immune evasion. Finally, the significance of anti-proliferative genes like [BTG1](/details-gene/694) is consistent with the view of CD56-dim NK cells as terminally differentiated effectors. Understanding the pathways that maintain this quiescent but "ready" state could be key to developing strategies for ex vivo expansion of NK cells for adoptive cell therapies. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The highly specific expression of MHC class I components [HLA E](/details-gene/3133) and [B2M](/details-gene/567) in [CD16-positive, CD56-dim natural killer cell, human](/details-cell/CL0000939) suggests a cell-intrinsic regulatory loop. We hypothesize that these NK cells express [HLA E](/details-gene/3133) on their own surface to engage their own or neighboring NK cells' inhibitory NKG2A/CD94 receptors, thereby setting a baseline activation threshold and preventing excessive or inappropriate activation in the absence of a bona fide target. * **Surprising Findings:** It is highly unexpected that key components of an inhibitory ligand pathway, typically associated with target cells, would serve as top specificity markers for the effector cell itself. This challenges the conventional view of NK cell recognition and suggests a more complex system of self-regulation. * **Testable Questions:** Does antibody-mediated blockade of surface [HLA E](/details-gene/3133) on isolated CD56-dim NK cells lead to increased spontaneous degranulation or cytokine production? Furthermore, does genetic knockdown of [HLA E](/details-gene/3133) in an NK cell line alter its long-term viability or responsiveness to activating stimuli? 2. **Hypothesis:** The strong co-expression signature of genes for mitochondrial respiration (e.g., [COX1](/details-gene/4512), [CYTB](/details-gene/4519)) and protein synthesis ([TPT1](/details-gene/7178), [EEF1D](/details-gene/1936)) indicates that CD56-dim NK cells are maintained in a state of "metabolic pre-activation". This high basal metabolic and biosynthetic rate is not merely a consequence of activation but a defining feature that enables their rapid, "off-the-shelf" effector functions without the delay required for metabolic reprogramming. * **Surprising Findings:** While cytotoxic lymphocytes are known to upregulate metabolism upon activation, this data suggests that for CD56-dim NK cells, a high metabolic poise is a specific, defining characteristic of their baseline state. This contrasts with naive T cells, which are metabolically quiescent. * **Testable Questions:** Using Seahorse metabolic analysis, how does the basal oxygen consumption rate (OCR) and extracellular acidification rate (ECAR) of resting CD56-dim NK cells compare to that of CD56-bright NK cells or naive T cells? Does acute inhibition of oxidative phosphorylation disproportionately impair the immediate cytotoxic capacity of CD56-dim NK cells compared to other lymphocyte subsets that may rely more on glycolysis?