Details for: CL0000899

Cell ID: CL0000899

Cell Name: T-helper 17 cell

Description: This cell type is compatible with the HIPC Lyoplate markers for 'Th17 CD4+ T cell', but its logical definition includes additional known characteristics of T-helper 17 T cells.

Synonyms: IL-17-producing CD4+ T helper, T helper cells type 17, T(H)-17 cell, Th17 T cell, Th17 T lymphocyte, Th17 T-cell, Th17 T-lymphocyte, Th17 cell, helper T cell type 17, Th17 CD4+ T cell

Selected Context(s): Overall

Gene Significance Landscape

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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 T-helper 17 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 T-helper 17 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 T-helper 17 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 T-helper 17 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:  T-helper 17 cell (CL0000899)

 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 [T-helper 17 cell](/details-cell/CL0000899), a distinct lineage of pro-inflammatory CD4+ helper T cells, is characterized in this analysis by an expression profile indicative of profound metabolic and biosynthetic activity. The top-ranking genes by expression specificity (`csi_z`), such as [TPT1](/details-gene/7178), [B2M](/details-gene/567), and multiple mitochondrial components, suggest that **Overall**, the defining feature of this cell population is not its canonical cytokine signature but rather a state of high cellular activation. This profile is consistent with an effector cell actively engaged in protein synthesis, energy production, and interaction with other immune cells. ## Key Characteristics and Function Analysis of the top marker genes reveals several interconnected functional themes that define the [T-helper 17 cell](/details-cell/CL0000899) in this context. * **High Metabolic and Bioenergetic State:** A significant number of the top markers are directly involved in cellular respiration and energy production. This includes multiple subunits of the cytochrome c oxidase complex ([COX1](/details-gene/4512), [COX2](/details-gene/4513), [COX7C](/details-gene/1350), [COX4I1](/details-gene/8477)) and another key mitochondrial gene, [ND3](/details-gene/4537). The high specificity score for [GAPDH](/details-gene/2597) further points to active glycolysis. This metabolic signature is characteristic of highly active effector lymphocytes that require substantial energy to perform their functions. * **Robust Protein Synthesis and Processing Machinery:** The most specific marker, [TPT1](/details-gene/7178) (Translationally Controlled Tumor Protein), along with other highly-ranked genes like [PABPC1](/details-gene/26986), [NPM1](/details-gene/4869), [EEF1D](/details-gene/1936), and [UBC](/details-gene/7316), underscores a state of elevated protein translation. This suggests the cell is actively synthesizing proteins required for its effector functions, such as cytokines, or for cellular maintenance and growth. * **Immune Surveillance and Interaction:** The high significance of [B2M](/details-gene/567) (Beta-2-microglobulin) and [HLA E](/details-gene/3133) is noteworthy. These are crucial components of the MHC class I pathway, which presents endogenous antigens. While [T-helper 17 cell](/details-cell/CL0000899)s are CD4+ T cells that primarily recognize antigens via MHC class II, their high expression of MHC class I components indicates they are also under surveillance by cytotoxic cells like [CD8-positive, alpha-beta T cell](/details-cell/CL0000625)s and NK cells. * **Transcriptional and Post-Transcriptional Regulation:** Genes such as [BTG1](/details-gene/694), a transcriptional coregulator, and [DDX5](/details-gene/1655), an RNA helicase involved in splicing, point to sophisticated control over gene expression programs, befitting a specialized and activated cell state. Conversely, the anti-marker list provides critical context. The low specificity scores for canonical Th17-associated genes, including the cytokine receptor [IL23R](/details-gene/149233) and the cytokine itself [IL23A](/details-gene/51561), are unexpected. This finding suggests that within this particular analytical context, these lineage-defining genes are not unique to [T-helper 17 cell](/details-cell/CL0000899)s and may be expressed by other cell types, thereby diminishing their specificity score. This highlights that the cell's identity in this dataset is more strongly defined by its general activation state than its unique cytokine axis. ## Clinical Significance and Contextual Roles **Overall**, the gene signature of this [T-helper 17 cell](/details-cell/CL0000899) population points towards a role as a highly active, pro-inflammatory effector cell. Th17 cells are known drivers of autoimmune diseases like psoriasis, rheumatoid arthritis, and inflammatory bowel disease. The observed molecular profile provides insight into the underpinnings of this function. The pronounced metabolic signature ([GAPDH](/details-gene/2597), [COX](/details-gene/4512) family) is consistent with the concept of immunometabolism, where metabolic reprogramming is essential for T cell differentiation and effector function. Targeting these metabolic pathways is an emerging therapeutic strategy for autoimmune conditions driven by pathogenic Th17 cells. Furthermore, the high expression of [FTH1](/details-gene/2495), involved in iron storage, connects cellular metabolism with iron homeostasis, a critical factor in immune cell function and inflammation. The prominence of genes like [TPT1](/details-gene/7178), also known as histamine-releasing factor, may directly link these cells to allergic and inflammatory responses. While the lack of specificity for canonical markers like [IL23R](/details-gene/149233) is puzzling, it may indicate that in a complex inflammatory environment, the "Th17" functional state is less about a single cytokine pathway and more about a holistic cellular program of activation, proliferation, and metabolic engagement. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The defining characteristic of this [T-helper 17 cell](/details-cell/CL0000899) population is not its lineage-specific cytokine production but rather its exceptionally high bioenergetic and biosynthetic state, representing a terminally differentiated and highly potent effector cell. This metabolic state may be a prerequisite for its pathogenic activity in inflammatory settings. * **Surprising Findings:** The most specific genetic markers for this cell are not conventional Th17-lineage genes (e.g., *RORC*, *IL17A*, *IL23R*). Instead, they are genes related to general cellular processes like metabolism and translation. The canonical Th17-related gene [IL23R](/details-gene/149233) appears as an anti-marker, suggesting its expression is not a specific identifier in this dataset, possibly due to its expression in other activated cell types. * **Testable Questions:** How does the metabolic activity (measured by oxygen consumption rate and extracellular acidification rate) of this [T-helper 17 cell](/details-cell/CL0000899) population compare to other T cell subsets from the same tissue? Does pharmacologic inhibition of glycolysis or oxidative phosphorylation selectively impair its effector functions (e.g., cytokine secretion) or survival? 2. **Hypothesis:** The strong expression signature of MHC class I pathway components ([B2M](/details-gene/567), [HLA E](/details-gene/3133)) suggests these [T-helper 17 cell](/details-cell/CL0000899)s are tightly regulated by cytotoxic lymphocytes as a potential feedback mechanism to control inflammation. Their highly activated state may render them more visible and susceptible to elimination by [CD8-positive, alpha-beta T cell](/details-cell/CL0000625)s or NK cells to prevent excessive tissue damage. * **Surprising Findings:** The analysis prioritizes genes involved in antigen presentation to cytotoxic cells over those typically associated with the primary function of a helper T cell, such as T-cell receptor signaling or co-stimulation molecules. This shifts the focus from the cell's action on other cells to how it is perceived and regulated by them. * **Testable Questions:** In a co-culture system, are [T-helper 17 cell](/details-cell/CL0000899)s with high [B2M](/details-gene/567) expression more efficiently killed by autologous [CD8-positive, alpha-beta T cell](/details-cell/CL0000625)s compared to those with lower [B2M](/details-gene/567) expression? Does the blockade of inhibitory receptors on NK cells enhance the clearance of this Th17 population?