Details for: TRBV4 2

Gene ID: 28616

Gene Type:  Other  - A known gene or region type that lacks a specific category. Includes immunoglobulin (Ig), T-cell receptor (TCR) gene segments, and repetitive elements.

Symbol: TRBV4 2

Ensembl ID: ENSG00000211745

Description: T cell receptor beta variable 4-2

Cell Significance Landscape

Associated with

Significant Cells

Cell Significance Index (CSI) scores for the chosen context(s)

  • double-positive, alpha-beta thymocyte CL0000809
    CSI 4.57
    rCSI 4.65%
    PRS 100

Cell ID: Standard Cell Ontology term used for mapping and comparing cells across experiments. Ensures consistency in analyzing cellular functions across tissues.
Fold Change: Represents the ratio of the current Cell Significance Index to the Cell Significance Index Threshold, indicating how much the gene expression has changed compared to a baseline.
Cell Significance Index: Reflects how strongly a gene is expressed in this specific cell.

Cell ID: Standard Cell Ontology term used for mapping and comparing cells across experiments. Ensures consistency in analyzing cellular functions across tissues.
Fold Change: Represents the ratio of the current Cell Significance Index to the Cell Significance Index Threshold, indicating how much the gene expression has changed compared to a baseline.
Cell Significance Index: Reflects how strongly a gene is expressed in this cell type. Calculated using techniques like effect size estimation and bootstrapping for reliability.

Cell ID: Standard Cell Ontology term used for mapping and comparing cells across experiments. Ensures consistency in analyzing cellular functions across tissues.
Fold Change: Represents the ratio of the current Cell Significance Index to the Cell Significance Index Threshold, indicating how much the gene expression has changed compared to a baseline.
Cell Significance Index: Reflects how strongly a gene is expressed in this cell type. Calculated using techniques like effect size estimation and bootstrapping for reliability.
Network Configuration

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Other Information

This section provides additional information about the gene, including a description generated by an AI language model and details about associated proteins.

## Summary [TRBV4 2](/details-gene/28616) is a gene segment located on chromosome 7 that encodes the T-cell receptor beta variable 4-2 chain. As a key component of the T-cell receptor (TCR) complex, it plays a fundamental role in the adaptive immune system. Through V(D)J recombination, [TRBV4 2](/details-gene/28616) contributes to the vast diversity of the T-cell repertoire, enabling the recognition of a wide array of foreign antigens. Its expression is particularly significant in developing T-cells, such as [double-positive, alpha-beta thymocytes](/details-cell/CL0000809), highlighting its importance during T-cell maturation in the thymus. ## Cellular Roles and Expression Landscape The expression profile of [TRBV4 2](/details-gene/28616) underscores its specialized function within the T-lymphocyte lineage. **Overall**, the gene shows its most significant expression in [double-positive, alpha-beta thymocytes](/details-cell/CL0000809) (CSI: 4.57). This cell type is a critical intermediate stage in T-cell development where thymocytes express both CD4 and CD8 co-receptors. The high significance of [TRBV4 2](/details-gene/28616) in this context is consistent with its role in the formation of the TCR beta chain, a process that is essential for the positive and negative selection events that shape the mature T-cell repertoire. The successful rearrangement and expression of a TCR containing segments like [TRBV4 2](/details-gene/28616) is a prerequisite for the survival and further differentiation of these developing thymocytes. The available data points to a highly specific role for this gene segment during the central tolerance and lineage commitment phases of T-cell biology. ## Pathways and Molecular Function Functionally, [TRBV4 2](/details-gene/28616) is integral to the molecular machinery of adaptive immunity. As a structural component of the 'T cell receptor complex' ([GO:0042101](https://www.ebi.ac.uk/QuickGO/term/GO:0042101)), it is localized to the 'plasma membrane' ([GO:0005886](https://www.ebi.ac.uk/QuickGO/term/GO:0005886)). This placement is critical for its function in the 'cell surface receptor signaling pathway' ([GO:0007166](https://www.ebi.ac.uk/QuickGO/term/GO:0007166)). The engagement of the TCR with peptide-MHC complexes on antigen-presenting cells initiates a signaling cascade that is the cornerstone of the 'adaptive immune response' ([GO:0002250](https://www.ebi.ac.uk/QuickGO/term/GO:0002250)). This process dictates T-cell activation, proliferation, and effector function. The involvement in these pathways aligns perfectly with its high expression in [double-positive, alpha-beta thymocytes](/details-cell/CL0000809), the very cells where the functionality of the newly assembled TCR is first tested. ## Research Directions While [TRBV4 2](/details-gene/28616) is a normal component of the T-cell repertoire, its usage frequency and the characteristics of T-cells expressing it may be altered in disease, suggesting several avenues for investigation. **Testable Hypotheses:** 1. The frequency of [TRBV4 2](/details-gene/28616) gene segment usage within the T-cell repertoire is significantly skewed in patients with specific autoimmune diseases (e.g., multiple sclerosis), where it may be preferentially utilized by pathogenic, self-reactive T-cell clones. 2. In certain T-cell malignancies, such as T-cell acute lymphoblastic leukemia (T-ALL), clonal expansion of a malignant cell line may lead to a dominant expression of a single TCR, potentially one utilizing the [TRBV4 2](/details-gene/28616) segment, which could serve as a highly specific tumor marker. **Proposed Experiment:** To test the first hypothesis regarding autoimmunity, a high-throughput T-cell receptor sequencing (TCR-seq) analysis could be performed on peripheral blood mononuclear cells (PBMCs) from a large cohort of multiple sclerosis patients and age-matched healthy controls. By computationally analyzing the TCR-beta chain sequences, one could quantify the relative abundance and clonal expansion of T-cells utilizing the [TRBV4 2](/details-gene/28616) segment. A statistically significant enrichment in the patient cohort compared to controls would support the hypothesis that this segment is involved in the autoimmune pathology. **Therapeutic Potential:** As a gene segment, [TRBV4 2](/details-gene/28616) is not a direct drug target. However, T-cells expressing a specific TCR that incorporates this segment could become therapeutic targets. If a pathogenic or malignant T-cell clone is identified by its unique TCR (containing [TRBV4 2](/details-gene/28616)), it could be targeted for depletion. This could be achieved through strategies like monoclonal antibodies directed against the specific TCR variable region or engineered T-cell therapies (e.g., CAR-T) designed to recognize and eliminate the disease-causing T-cell population. Therefore, the therapeutic strategy would be one of inhibition or targeted depletion of a specific cell subset defined by its receptor.