Details for: CL0001080

Cell ID: CL0001080

Cell Name: NKp44-negative group 3 innate lymphoid cell, human

Description: A group 3 innate lymphoid cell in the human with the phenotype IL-7Ralpha-positive, and NKp44-negative.

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 NKp44-negative group 3 innate lymphoid 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 NKp44-negative group 3 innate lymphoid 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 NKp44-negative group 3 innate lymphoid 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 NKp44-negative group 3 innate lymphoid 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.

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Target Cell for CSI:  NKp44-negative group 3 innate lymphoid cell, human (CL0001080)

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Node size also reflects Target Cell CSI magnitude.
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 N/A or Not Sig.
Edges (Interactions):
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## Summary The [NKp44-negative group 3 innate lymphoid cell, human](/details-cell/CL0001080) is a subset of Group 3 innate lymphoid cells (ILC3s) characterized by the expression of IL-7Ralpha and the absence of NKp44. The gene significance profile suggests this cell is in a state of high metabolic readiness, with a uniquely specific expression signature of mitochondrial genes involved in oxidative phosphorylation. This metabolic phenotype is coupled with the expression of key ILC3 functional genes, such as [LTB](/details-gene/4050), and tight regulation of cell state, indicating a role as a poised, tissue-resident sentinel cell crucial for mucosal immunity. ## Key Characteristics and Function **Overall**, the gene expression landscape of the [NKp44-negative group 3 innate lymphoid cell, human](/details-cell/CL0001080) points to a cell with a remarkably high and specific metabolic signature, tightly controlled activation and proliferation programs, and core functions in innate immunity and lymphoid tissue organization. * **High Metabolic Activity:** A defining characteristic of this cell type is the highly specific expression of multiple mitochondrially-encoded genes critical for the electron transport chain. The top markers include Cytochrome c oxidase subunits [COX1](/details-gene/4512) (CSI_Z: 3.10) and [COX2](/details-gene/4513) (CSI_Z: 2.96), as well as NADH dehydrogenase subunit [ND4L](/details-gene/4539) (CSI_Z: 2.84) and Cytochrome b ([CYTB](/details-gene/4519), CSI_Z: 2.44). This unusual specificity (`csi_z`) for core metabolic machinery suggests that a heightened state of oxidative phosphorylation is not merely a feature but a key identifier of these cells, likely poising them for rapid energy expenditure upon activation. This is further supported by the high significance of [GAPDH](/details-gene/2597) and the ATP synthase component [ATP5MG](/details-gene/10632). * **Innate Lymphoid Identity and Effector Function:** The cell's identity is confirmed by the specific expression of [IL7R](/details-gene/3575) (CSI_Z: 2.51), the alpha chain of the IL-7 receptor, which is essential for ILC development and homeostasis. Critically, the high significance of [LTB](/details-gene/4050) (Lymphotoxin Beta, CSI_Z: 2.46) underscores its function as a canonical ILC3, as this cytokine is vital for the formation and maintenance of secondary lymphoid structures in mucosal tissues. The expression of the early activation marker [CD69](/details-gene/969) (CSI_Z: 2.44) and the lymphocyte antigen [CD52](/details-gene/1043) (CSI_Z: 2.61) are consistent with an active or poised immune cell. The presence of [B2M](/details-gene/567) indicates a capacity for antigen presentation via MHC class I, enabling interaction with adaptive immune cells. * **Transcriptional and Post-transcriptional Regulation:** The cell's state appears to be under stringent control. The high `csi_z` score for [BTG1](/details-gene/694) (CSI_Z: 3.02), an antiproliferative gene, suggests a mechanism to maintain quiescence in a homeostatic state. This is balanced by significant expression of genes involved in growth and ribosome biogenesis, such as nucleophosmin ([NPM1](/details-gene/4869)). Furthermore, the high specificity of [ZFP36](/details-gene/7538) (CSI_Z: 2.92), a protein that destabilizes mRNAs of inflammatory cytokines, indicates a post-transcriptional mechanism to control and resolve immune responses, preventing excessive inflammation. * **Cytoskeletal Organization:** Significant expression of genes involved in actin dynamics, including [EVL](/details-gene/51466) and cofilin 1 ([CFL1](/details-gene/1072)), suggests a prepared state for cell motility, adhesion, and formation of immune synapses, which are essential functions for immune surveillance and effector activity within tissues. * **Anti-Markers:** The low significance scores for genes like [LCP2](/details-gene/3937) (SLP-76), a key T-cell receptor signaling adaptor, helps differentiate this innate cell from its adaptive lymphocyte counterparts. Similarly, the low significance of [KLRB1](/details-gene/3820) (CD161), often associated with NK cells and other ILC subsets, may help refine the specific identity of this population. The minimal significance of [TGFB1](/details-gene/7040) suggests these cells are not major producers of this key regulatory and often immunosuppressive cytokine in their basal state. ## Clinical Significance and Contextual Roles As only the **Overall** context is provided, this analysis focuses on the inherent properties of the [NKp44-negative group 3 innate lymphoid cell, human](/details-cell/CL0001080) that suggest its potential roles in health and disease. ILC3s are known to be critical mediators of mucosal immunity, particularly in the gut, where they contribute to defense against extracellular bacteria and fungi, and are involved in maintaining epithelial barrier integrity. The gene signature of this cell type provides molecular evidence supporting these roles. The high specific expression of [LTB](/details-gene/4050) is directly linked to the formation of lymphoid tissues, such as cryptopatches and isolated lymphoid follicles, which are essential for organizing mucosal immune responses ([Link](https://doi.org/10.1016/0092-8674(93)90574-a)). Dysregulation of ILC3 function and [LTB](/details-gene/4050) signaling is implicated in the pathogenesis of chronic inflammatory diseases, including inflammatory bowel disease (IBD). The distinct metabolic profile, characterized by a high signature of oxidative phosphorylation genes ([COX1](/details-gene/4512), [COX2](/details-gene/4513)), suggests these cells have substantial energy reserves. This metabolic "poising" may enable them to rapidly mount effector responses, such as producing cytokines like IL-17 and IL-22 (key ILC3 products not captured as top markers here, but functionally downstream). In chronic inflammatory or cancerous microenvironments, where nutrient availability can be limited and metabolic competition is high, the intrinsic metabolic capacity of these ILC3s could be a critical determinant of their persistence and function. The expression of regulatory molecules like the antiproliferative factor [BTG1](/details-gene/694) and the mRNA-destabilizing protein [ZFP36](/details-gene/7538) highlights the tight controls governing ILC3 activity. Loss of these controls could lead to unchecked ILC3-driven inflammation. For instance, reduced [ZFP36](/details-gene/7538) activity could lead to overproduction of inflammatory cytokines, contributing to tissue damage in autoimmune conditions. ## Potential Mechanisms and Research Directions 1. **Hypothesis: Metabolic Poising as a Defining Lineage Feature** The uniquely specific expression signature of mitochondrial electron transport chain components ([COX1](/details-gene/4512), [COX2](/details--gene/4513)) in [NKp44-negative group 3 innate lymphoid cell, human](/details-cell/CL0001080) represents a specific metabolic adaptation. We hypothesize that this "metabolic pre-arming" is a core aspect of their function as tissue-resident sentinels, enabling them to bypass metabolic checkpoints and mount immediate, energy-intensive effector responses (e.g., cytokine production) upon encountering activating signals. * **Surprising Findings:** It is highly unusual for core housekeeping genes like mitochondrial components to serve as top *specific* markers based on a Z-score analysis. This suggests that the quantitative level of metabolic activity, rather than just the presence of a specific surface receptor, is a defining feature that distinguishes these cells from other immune populations in their microenvironment. * **Testable Questions:** Does selective inhibition of oxidative phosphorylation (e.g., with rotenone or oligomycin) disproportionately blunt the early (0-4 hour) production of IL-22 and lymphotoxin by human ILC3s compared to co-resident T cells following stimulation with an activating cytokine cocktail (e.g., IL-1beta and IL-23)? 2. **Hypothesis: A "Brake and Accelerator" Model for Regulating ILC3 Activation** The concurrent high specificity of antiproliferative ([BTG1](/details-gene/694)) and pro-growth ([NPM1](/details-gene/4869)) factors, combined with post-transcriptional repressors ([ZFP36](/details-gene/7538)), suggests that [NKp44-negative group 3 innate lymphoid cell, human](/details-cell/CL0001080) are maintained in a state of dynamic equilibrium. We hypothesize that this "brake-and-accelerator" system sets a precise activation threshold, allowing for rapid response to danger signals while preventing aberrant proliferation and chronic inflammation under homeostatic conditions. * **Surprising Findings:** The co-expression of genes with opposing functions on cell growth and activation as highly specific markers is counter-intuitive. It points away from a simple "on/off" switch and towards a more nuanced, rheostat-like control system that fine-tunes the cell's responsiveness to its environment. * **Testable Questions:** Does shRNA-mediated knockdown of [BTG1](/details-gene/694) in primary human ILC3s result in a heightened proliferative response to low-dose cytokine stimulation and/or increased basal expression of effector cytokines? Conversely, does knockdown of [ZFP36](/details-gene/7538) lead to a prolonged and exaggerated cytokine production profile following a transient stimulus?