Details for: CL0000938

Cell ID: CL0000938

Cell Name: CD16-negative, CD56-bright natural killer cell, human

Description: This cell type is compatible with the HIPC Lyoplate markers for 'CD16-CD56bright NK cell'. Markers are associated with human cell types.

Synonyms: CD16-negative, CD56-bright NK cell, CD56-bright cytokine secreting NK cell, CD56-bright cytokine secreting natural killer cell, CD16-CD56bright 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-negative, CD56-bright 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-negative, CD56-bright 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-negative, CD56-bright 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-negative, CD56-bright 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-negative, CD56-bright natural killer cell, human (CL0000938)

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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-negative, CD56-bright natural killer cell, human](/details-cell/CL0000938) is a distinct subset of natural killer (NK) cells characterized by high expression of the neural cell adhesion molecule (NCAM1/CD56) and the absence of the Fc gamma receptor III (FCGR3A/CD16). **Overall**, the gene significance profile suggests this cell is not primarily a direct cytotoxic effector but rather a metabolically primed, immunoregulatory cell. Its identity is defined by a unique combination of genes involved in proliferation control, such as [BTG1](/details-gene/694), and immune recognition, including the non-classical MHC molecule [HLA-E](/details-gene/3133). This profile is consistent with its established role as a potent producer of cytokines upon activation. ## Key Characteristics and Function Analysis of top marker genes, ranked by expression specificity (CSI Z-score), reveals several core functional clusters that define the [CD16-negative, CD56-bright natural killer cell, human](/details-cell/CL0000938). * **Immune Regulation and Self-Recognition:** A defining characteristic is the high significance of genes involved in MHC class I presentation, specifically the non-classical molecule [HLA-E](/details-gene/3133) and its essential partner [B2M](/details-gene/567) (beta-2-microglobulin). [HLA-E](/details-gene/3133) is a critical ligand for the inhibitory receptor NKG2A/CD94 complex on NK cells, suggesting a key role in self-tolerance and the modulation of NK cell activity. The high specificity of these genes underscores the importance of this regulatory axis in defining the cell's function. * **Metabolic Priming and High Translational Capacity:** The cell exhibits a strong signature of high metabolic readiness. Numerous top markers are core components of the mitochondrial electron transport chain, including [COX1](/details-gene/4512), [COX2](/details-gene/4513), and [CYTB](/details-gene/4519). This is complemented by high specificity for genes essential for protein synthesis and translation elongation, such as [TPT1](/details-gene/7178), [EEF1B2](/details-gene/1933), and [EEF1D](/details-gene/1936). This molecular machinery is consistent with the cell's synonym, "cytokine secreting NK cell," as it appears primed for rapid, large-scale protein production following activation. * **Transcriptional and Proliferation Control:** The top marker, [BTG1](/details-gene/694), is a transcription coregulator known for its anti-proliferative effects ([Link](https://doi.org/10.1002/j.1460-2075.1992.tb05213.x)). Its high specificity may indicate that these cells are maintained in a tightly regulated, quiescent, or terminally differentiated state under basal conditions. The significance of other nuclear proteins like the RNA helicase [DDX5](/details-gene/1655) and the nucleolar phosphoprotein [NPM1](/details-gene/4869) further points to complex regulation at the transcriptional and post-transcriptional levels. * **Cytoskeletal and Signaling Components:** Genes such as [CFL1](/details-gene/1072) (cofilin 1) and [MYL12A](/details-gene/10627) are highly specific, indicating active cytoskeletal remodeling. This is essential for cell motility, adhesion, and the formation of the immunological synapse required for targeted cytokine release. The high significance of the damage-associated molecular pattern (DAMP) molecule [HMGB1](/details-gene/3146) suggests these cells may also contribute to the inflammatory milieu by releasing alarmins. **Overall**, the anti-marker profile further refines this cell's identity. The low significance of genes like [IL18R1](/details-gene/8809) and [IL18RAP](/details-gene/8807) may suggest that while IL-18 is a known NK cell activator, reliance on its receptor complex is not a uniquely defining feature of this cell type compared to others, or that its expression is highly context-dependent. ## Clinical Significance and Contextual Roles The gene signature of the [CD16-negative, CD56-bright natural killer cell, human](/details-cell/CL0000938) points to important roles in immune surveillance, particularly in cancer and inflammatory diseases. The high specificity of [HLA-E](/details-gene/3133) is clinically significant, as its upregulation on tumor cells is a known mechanism of immune escape, allowing them to evade NK cell-mediated killing by engaging inhibitory NKG2A receptors. The prominent role of this axis in CD56-bright NK cells suggests they are key players in this dynamic. Similarly, the expression of [B2M](/details-gene/567) is crucial, as loss-of-function mutations in [B2M](/details-gene/567) are another strategy used by cancer cells to avoid T-cell recognition. The top marker, [BTG1](/details-gene/694), was first identified due to its involvement in a chromosomal translocation in B-cell chronic lymphocytic leukemia ([Link](https://doi.org/10.1002/j.1460-2075.1992.tb05213.x)), highlighting its role in lymphocyte biology and cancer. Its specific expression in this NK cell subset could have implications for understanding its regulatory function in both healthy and malignant contexts. Furthermore, the high significance of [HMGB1](/details-gene/3146), a potent pro-inflammatory alarmin, suggests a role for these cells in amplifying inflammation. Elevated [HMGB1](/details-gene/3146) expression has been linked to various disease states, including gastrointestinal adenocarcinomas ([Link](https://doi.org/10.1002/(sici)1097-0215(19970220)74:1%3C1::aid-ijc1%3E3.0.co;2-6)). This indicates that [CD16-negative, CD56-bright natural killer cells, human](/details-cell/CL0000938) might contribute to the tumor microenvironment not only through cytokine secretion but also via the release of DAMPs. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The high expression specificity of the anti-proliferative gene [BTG1](/details-gene/694) acts as a molecular brake to maintain [CD16-negative, CD56-bright natural killer cells, human](/details-cell/CL0000938) in a state of quiescent readiness. This prevents uncontrolled expansion while keeping them metabolically primed (as indicated by mitochondrial gene expression) for rapid cytokine production upon activation, thus decoupling their effector function from proliferation. * **Surprising Findings:** The most specific marker for a lymphocyte population is a gene associated with negative regulation of proliferation. This challenges the conventional view of lymphocyte function being tightly linked to clonal expansion and suggests a distinct, more regulatory or "first-responder" role for this NK subset. * **Testable Questions:** Does CRISPR-mediated knockout of [BTG1](/details-gene/694) in primary human CD56-bright NK cells lead to enhanced proliferation in response to sub-optimal cytokine stimulation (e.g., low-dose IL-15), and does this altered proliferative state impact the magnitude or profile of their subsequent cytokine secretion (e.g., IFN-γ, TNF-α)? 2. **Hypothesis:** The defining signature of [CD16-negative, CD56-bright natural killer cells, human](/details-cell/CL0000938) reflects a primary function as tissue-resident immune regulators and inflammatory amplifiers, rather than circulating killers. Their high expression of [HMGB1](/details-gene/3146) and robust protein synthesis machinery ([TPT1](/details-gene/7178), [EEF1B2](/details-gene/1933)) enables them to sense cellular stress and rapidly release a combination of canonical cytokines and DAMPs to orchestrate a broader immune response. * **Surprising Findings:** It is unexpected that genes for core metabolic and translational machinery would be more specific markers for this cell type than classical immune-related genes such as cytokine receptors or specific transcription factors. This suggests that the *capacity* for high-level protein production is a more unique and defining feature of these cells than the specific signals they respond to. * **Testable Questions:** Upon stimulation with activating ligands (e.g., via NKp46) or cytokines (IL-12/IL-18), do these cells actively secrete [HMGB1](/details-gene/3146) in addition to IFN-γ? Furthermore, does the conditioned media from these activated NK cells, when depleted of IFN-γ, still retain the ability to activate myeloid cells like macrophages, and is this effect abrogated by an [HMGB1](/details-gene/3146)-neutralizing antibody?