Details for: CL0000545

Cell ID: CL0000545

Cell Name: T-helper 1 cell

Description: This cell type is compatible with the HIPC Lyoplate markers for 'Th1 CD4+ T cell', but its logical definition includes additional known characteristics of T-helper 1 T cells.

Synonyms: T(H)-1 cell, Th1 T cell, Th1 T lymphocyte, Th1 T-cell, Th1 T-lymphocyte, Th1 cell, helper T cell type 1, T helper cells type 1, Th1 CD4+ T cell

Selected Context(s): Overall

Gene Significance Landscape

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Score:
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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 1 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 1 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 1 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 1 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 1 cell (CL0000545)

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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 1 cell](/details-cell/CL0000545), or Th1 cell, is a lineage of CD4+ T helper cells crucial for orchestrating cell-mediated immunity, particularly against intracellular pathogens. Based on its gene significance profile, this cell type is characterized by an exceptionally high level of metabolic and biosynthetic activity. The top specific markers are not canonical Th1 lineage-defining factors but rather a broad suite of genes involved in mitochondrial respiration (e.g., [COX1](/details-gene/4512), [COX2](/details-gene/4513)), protein synthesis (e.g., [TPT1](/details-gene/7178)), and transcriptional regulation (e.g., [BTG1](/details-gene/694)). This profile suggests that the defining characteristic of a [T-helper 1 cell](/details-cell/CL0000545) in this **Overall** context is a state of high metabolic readiness, priming it for rapid and potent effector functions. ## Key Characteristics and Function Analysis of the top marker genes, identified by expression specificity (CSI Z-score), reveals several core functional clusters that define the [T-helper 1 cell](/details-cell/CL0000545). * **High Metabolic Activity:** A striking feature is the prominence of genes encoding components of the mitochondrial electron transport chain, including [COX1](/details-gene/4512), [COX2](/details-gene/4513), [CYTB](/details-gene/4519), [UQCRB](/details-gene/7381), [ATP6](/details-gene/4508), and [ND3](/details-gene/4537). The high specificity score of these genes suggests that robust aerobic respiration is a cornerstone of the Th1 phenotype, likely required to fuel the energy-intensive processes of cytokine production and proliferation. This is further supported by the specific expression of [FTH1](/details-gene/2495) and [FTL](/details-gene/2512), which regulate iron homeostasis, a critical cofactor for mitochondrial enzymes. * **Robust Biosynthetic Capacity:** The cell demonstrates a strong commitment to protein synthesis and processing. [TPT1](/details-gene/7178) (Translationally-Controlled Tumor Protein) and translation elongation factors [EEF1D](/details-gene/1936) and [EEF1B2](/details-gene/1933) are among the top markers. This indicates a high capacity for producing proteins, which is consistent with the primary role of Th1 cells as secretors of effector cytokines. * **Complex Transcriptional and Post-Transcriptional Regulation:** The cell's function is governed by a sophisticated network of regulatory genes. This includes transcription factors like [BTG1](/details-gene/694), [KLF6](/details-gene/1316), and the proto-oncogene [JUN](/details-gene/3725), which are involved in controlling cell proliferation and activation. Critically, several top markers are involved in RNA processing and stability, such as the RNA helicase [DDX5](/details-gene/1655), the splicing factor [SRSF5](/details-gene/6430), and [ZFP36](/details-gene/7538). [ZFP36](/details-gene/7538) is particularly noteworthy as it promotes the degradation of AU-rich element-containing mRNAs, including those for many inflammatory cytokines. Its high specificity suggests that Th1 cells possess intrinsic, robust mechanisms to terminate their own inflammatory signals. * **Immune Modulation and Antigen Presentation:** The high specificity of [B2M](/details-gene/567) and [HLA E](/details-gene/3133) is also significant. While [B2M](/details-gene/567) is a component of MHC class I molecules found on most nucleated cells, its high rank here may reflect active interaction with other immune cells. [HLA E](/details-gene/3133) is a non-classical MHC molecule that interacts with inhibitory and activating receptors on NK cells and CD8+ T cells, suggesting a potential role for Th1 cells in regulating other cytotoxic lymphocyte populations. The anti-marker profile helps to further refine the cell's identity. The low significance of genes like [LEF1](/details-gene/51176) and [CCR6](/details-gene/1235) helps distinguish the Th1 lineage from naive T cells or other T helper subsets like Th17 cells, respectively. ## Clinical Significance and Contextual Roles **Overall**, the gene signature of the [T-helper 1 cell](/details-cell/CL0000545) points to a cell that is metabolically primed for potent, yet tightly regulated, effector functions. While classical Th1-associated genes (e.g., *IFNG*, *TBX21*) are not the top markers by specificity in this analysis, the machinery required to support their expression and function is highly characteristic. The prominence of [ZFP36](/details-gene/7538), an mRNA-destabilizing factor, is clinically relevant. Dysregulation of [ZFP36](/details-gene/7538) can lead to the overproduction of inflammatory cytokines, a hallmark of many autoimmune diseases. Therefore, the inherent high-level expression of this post-transcriptional brake may be a critical feature for preventing immunopathology driven by Th1 cells. Additionally, the presence of [ITM2B](/details-gene/9445) as a specific marker is intriguing. Mutations in this gene are associated with familial British and Danish dementias through the formation of amyloid peptides ([Link](https://doi.org/10.1038/21637)). While its role in T cells is not well-defined, it suggests a potential, though speculative, link between Th1 cell activity and neuroinflammatory processes. Similarly, the high specificity of general transcription factors like [JUN](/details-gene/3725) and [KLF6](/details-gene/1316), which are involved in diverse cellular processes from proliferation to fibrosis ([Link](https://doi.org/10.1073/pnas.95.16.9500)), highlights the cell's potential for pleiotropic effects in various tissue contexts. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The defining characteristic of a [T-helper 1 cell](/details-cell/CL0000545) is not simply its capacity to produce IFN-gamma, but its underlying state of high metabolic commitment to oxidative phosphorylation, which is essential to fuel sustained effector functions. * **Surprising Findings:** The most specific genetic markers for this cell type are not lineage-defining transcription factors or cytokines, but rather components of core mitochondrial and translational machinery. This suggests that metabolic state, rather than a single master regulator, may be the most distinct feature of Th1 cells when compared broadly to other cell populations. * **Testable Questions:** How does selective inhibition of the mitochondrial electron transport chain affect the long-term survival and cytokine-secreting capacity of differentiated Th1 cells compared to other T-helper subsets, such as Th2 or Th17 cells? 2. **Hypothesis:** The functional state of a [T-helper 1 cell](/details-cell/CL0000545) is maintained in a "poised-and-regulated" equilibrium, where powerful pro-inflammatory potential is constitutively held in check by equally potent post-transcriptional brakes. * **Surprising Findings:** An mRNA-destabilizing protein, [ZFP36](/details-gene/7538), ranks as one of the most specific markers. This finding elevates the importance of negative regulatory pathways, suggesting that the "off-switch" for the Th1 inflammatory response is as integral to the cell's identity as the "on-switch." * **Testable Questions:** Does conditional knockout of [ZFP36](/details-gene/7538) specifically in CD4+ T cells lead to an exaggerated or prolonged Th1-mediated inflammatory response in an in vivo model of infection or autoimmunity?