Details for: CL0001078

Cell ID: CL0001078

Cell Name: group 3 innate lymphoid cell, human

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

Synonyms: ILC3, human

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 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 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 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 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.

Maximum number of selected genes.
Select a context for the baseline cell.
Select a context for the target cell.
Target Cell for CSI:  group 3 innate lymphoid cell, human (CL0001078)

 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.

Loading network (please wait)...

## Summary The human [group 3 innate lymphoid cell](/details-cell/CL0001078) (ILC3) is a population of innate lymphocytes defined by the expression of the IL-7 receptor alpha chain. Based on its gene significance profile, this cell type is characterized by the specific expression of genes essential for immune surveillance, antigen presentation, and cytoskeletal dynamics. **Overall**, the top marker genes suggest that ILC3s are highly active immune cells, equipped for cell-cell communication, motility, and rapid response within tissue microenvironments, consistent with their established role in mucosal immunity and tissue homeostasis. ## Key Characteristics and Function Analysis of gene significance based on expression specificity (`csi_z`) reveals several core functional clusters that define the human [ILC3](/details-cell/CL0001078) identity. * **Antigen Presentation and Immune Recognition:** The most specific marker is [`B2M`](/details-gene/567) (CSI: 4.06), which forms the light chain of MHC class I molecules. This is complemented by the high specificity of [`HLA B`](/details-gene/3106), a classical MHC class I heavy chain. This strong signature for MHC-I machinery suggests a potentially significant role for ILC3s in presenting endogenous antigens, a function classically associated with the adaptive immune system. Further supporting a role in lymphocyte interaction is the specific expression of [`CD3D`](/details-gene/915), a component of the T-cell receptor complex, which may indicate shared signaling pathways or a closer functional relationship with T cells than previously appreciated. * **Cytoskeletal Organization and Motility:** A prominent group of markers is involved in regulating the actin cytoskeleton. These include [`CORO1A`](/details-gene/11151), involved in immunological synapse formation; [`ARPC2`](/details-gene/10109), a core component of the actin-nucleating Arp2/3 complex; [`RAC2`](/details-gene/5880), a GTPase that controls cell migration; and [`CFL1`](/details-gene/1072), an actin-depolymerizing factor. This molecular signature strongly indicates that ILC3s are motile cells capable of dynamic morphological changes, which is crucial for tissue surveillance and infiltration. * **Transcriptional and Post-Transcriptional Regulation:** The data highlight the specific expression of regulatory genes such as [`BTG1`](/details-gene/694), an anti-proliferative transcription coregulator, and [`PABPC1`](/details-gene/26986), a key poly(A)-binding protein that regulates mRNA stability and translation. The transcription factor [`JUNB`](/details-gene/3726) also appears as a specific marker, suggesting that AP-1 signaling pathways are actively shaping the ILC3 phenotype. * **Cytokine Signaling:** The specific expression of [`IL32`](/details-gene/9235), a pro-inflammatory cytokine, is consistent with the role of ILC3s as important producers of cytokines that orchestrate inflammatory responses, particularly at mucosal surfaces ([Link](https://pubmed.ncbi.nlm.nih.gov/15664165/)). **Overall**, the anti-marker profile helps refine the cell's identity. The relatively low significance of core metabolic genes like [`GAPDH`](/details-gene/2597) and [`PKM`](/details-gene/5315), as well as general protein synthesis machinery components like [`SRP14`](/details-gene/6727), suggests that while these functions are active, they are not the most distinguishing features of this cell type compared to others. The negative CSI for [`KLRB1`](/details-gene/3820), a C-type lectin receptor often associated with NK cells, may help differentiate ILC3s from other related innate lymphocyte populations. ## Clinical Significance and Contextual Roles While this analysis is based on an **Overall** context, the specific gene signature of human [ILC3s](/details-cell/CL0001078) provides insights into their potential roles in health and disease. ILC3s are known to be critical for maintaining barrier integrity in the gut and lungs and for mediating host defense against extracellular bacteria and fungi, primarily through the production of IL-17 and IL-22. The high specificity of MHC class I components ([`B2M`](/details-gene/567), [`HLA B`](/details-gene/3106)) is particularly noteworthy. Dysregulation of antigen presentation on non-classical cell types can contribute to autoimmune diseases. The prominent role of ILC3s in intestinal inflammation, such as in Inflammatory Bowel Disease (IBD), could be linked to aberrant interactions with other immune cells mediated by this machinery. Furthermore, the expression of genes associated with cell motility and tissue invasion ([`RAC2`](/details-gene/5880), [`CORO1A`](/details-gene/11151)) underscores their capacity to accumulate at sites of inflammation. Targeting these pathways could represent a therapeutic strategy to modulate ILC3-driven pathology. The expression of [`IL32`](/details-gene/9235) points to its direct contribution to the inflammatory milieu, which is implicated in chronic inflammatory conditions and cancer. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The highly specific expression of a suite of genes controlling actin dynamics ([`CORO1A`](/details-gene/11151), [`ARPC2`](/details-gene/10109), [`RAC2`](/details-gene/5880)) indicates that directed migration and the formation of stable immunological synapses are not just supportive functions but are defining, core features of the human [ILC3](/details-cell/CL0001078) program. This machinery may be crucial for their positioning within tissue niches and for executing effector functions that require intimate cell-cell contact. * **Surprising Findings:** While immune cells are motile, the number and high specificity scores of cytoskeletal regulators in the top markers are striking. This suggests that the ILC3's interaction with its physical environment is a uniquely defining aspect of its biology, potentially more so than for other lymphocyte populations. * **Testable Questions:** Does the targeted knockout of [`RAC2`](/details-gene/5880) in humanized mouse models specifically impair the homing of ILC3s to the gut lamina propria during bacterial challenge, and does this alter the course of mucosal inflammation? 2. **Hypothesis:** The co-expression of T-cell-associated signaling component [`CD3D`](/details-gene/915) alongside a robust MHC class I antigen presentation pathway ([`B2M`](/details-gene/567), [`HLA B`](/details-gene/3106)) suggests that human ILC3s can engage in quasi-adaptive immune functions. These cells may act as local antigen-presenting cells to T-cells or utilize TCR-like signaling complexes for functions independent of antigen recognition, blurring the functional boundaries between innate and adaptive immunity. * **Surprising Findings:** The identification of [`CD3D`](/details-gene/915), a canonical component of the T-cell receptor complex, as a specific marker for an "innate" lymphoid cell is highly unexpected. It challenges the conventional view that ILCs operate exclusively through germline-encoded receptors. * **Testable Questions:** Using co-culture systems, can human [ILC3s](/details-cell/CL0001078) process and present viral or bacterial peptides via MHC class I to activate cytotoxic [CD8-positive, alpha-beta T cells](/details-cell/CL0000625)? Furthermore, does cross-linking surface proteins on ILC3s lead to intracellular signaling events that are dependent on [`CD3D`](/details-gene/915) expression?