Details for: IGKV3D 15

Gene ID: 28875

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: IGKV3D 15

Ensembl ID: ENSG00000224041

Description: immunoglobulin kappa variable 3D-15

Cell Significance Landscape

Associated with

Significant Cells

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

  • IgA plasma cell CL0000987
    CSI 10.07
    rCSI 10.31%
    PRS 99.66
  • plasmablast CL0000980
    CSI 4.9
    rCSI 3.86%
    PRS 99.92
  • IgG plasma cell CL0000985
    CSI 4.23
    rCSI 5.06%
    PRS 99.97

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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  • Node Color (Target Cell CSI, relative to current network):
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    • High
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    • CSI N/A
  • Node Size: Proportional to Target Cell CSI magnitude
  • STRING PPI Edge
  • Shared Pathway Edge (ONTOLOGY)

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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 [IGKV3D 15](/details-gene/28875) is a gene segment located on chromosome 2 that encodes a variable (V) region of the immunoglobulin kappa light chain. As a critical component of the antibody repertoire, it plays a fundamental role in the '[Adaptive immune response](/details-go/GO:0002250)' by contributing to the diversity of antigen-binding sites. Its expression is highly specific to the B cell lineage, with its significance being most pronounced in terminally differentiated antibody-secreting cells. **Overall**, it is a key marker for [IgA plasma cells](/details-cell/CL0000987), [plasmablasts](/details-cell/CL0000980), and [IgG plasma cells](/details-cell/CL0000985), highlighting its essential function in the humoral immune system's effector stage. ## Cellular Roles and Expression Landscape The expression profile of [IGKV3D 15](/details-gene/28875) firmly establishes its role within a specialized subset of immune cells. The gene's significance is overwhelmingly concentrated in cells responsible for antibody production. Analysis in the **Overall** context shows its highest cell significance index (CSI) in [IgA plasma cells](/details-cell/CL0000987) (CSI: 10.07), followed by their precursors, [plasmablasts](/details-cell/CL0000980) (CSI: 4.90), and [IgG plasma cells](/details-cell/CL0000985) (CSI: 4.23). This strong and specific expression pattern suggests that [IGKV3D 15](/details-gene/28875) is not merely a marker of the B cell lineage but is integral to the function of mature, antibody-secreting effector cells. The data strongly indicate a specialized function confined to the terminal stages of B lymphocyte differentiation, where large-scale synthesis of immunoglobulins occurs. ## Pathways and Molecular Function Functionally, [IGKV3D 15](/details-gene/28875) is annotated as being a core part of the '[Immune response](/details-go/GO:0006955)' and more specifically, the '[Adaptive immune response](/details-go/GO:0002250)'. Its molecular contribution is realized through its incorporation into the '[Immunoglobulin complex](/details-go/GO:0019814)', which constitutes the B cell receptor on the '[Plasma membrane](/details-go/GO:0005886)' of B cells and the secreted antibodies produced by plasma cells. During V(D)J recombination in developing B cells, the [IGKV3D 15](/details-gene/28875) segment is one of many potential V-gene segments that can be joined to a J-segment to form the variable domain of the kappa light chain. This process generates the vast diversity required for the immune system to recognize a wide array of foreign antigens. Its high expression in plasma cells directly reflects the massive transcriptional activity required to produce and secrete antibodies containing this particular V-gene segment. ## Research Directions The specific role of [IGKV3D 15](/details-gene/28875) beyond its general contribution to antibody diversity remains an area for further investigation, particularly concerning its potential biased usage in specific disease contexts. ### Proposed Hypotheses 1. **Antigen-Specific Enrichment:** The usage of the [IGKV3D 15](/details-gene/28875) gene segment may be preferentially selected for in B cell responses against specific classes of pathogens, such as encapsulated bacteria or particular viral glycoproteins, due to favorable structural properties for antigen binding. 2. **Role in Autoimmunity:** In certain autoimmune disorders, such as Sjögren's syndrome or rheumatoid arthritis, auto-reactive B cell clones might exhibit a biased, or skewed, usage of the [IGKV3D 15](/details-gene/28875) segment, contributing to the production of pathogenic autoantibodies that drive tissue damage. ### Key Experiment To test the hypothesis of its involvement in autoimmunity (Hypothesis 2), a powerful approach would be to perform high-throughput, single-cell V(D)J sequencing on sorted [plasmablasts](/details-cell/CL0000980) and [plasma cells](/details-cell/CL0000987) from the peripheral blood and affected tissues (e.g., salivary glands in Sjögren's syndrome) of patients and healthy controls. A statistically significant over-representation of rearranged immunoglobulin transcripts containing the [IGKV3D 15](/details-gene/28875) segment in the patient cohort would provide strong evidence for its association with the pathogenic autoimmune response. ### Therapeutic Potential As a germline gene segment, [IGKV3D 15](/details-gene/28875) itself is not a direct therapeutic target. However, its expression pattern could hold significant clinical utility. If its usage is found to be highly enriched in specific B cell-driven pathologies, such as B-cell lymphomas or autoimmune diseases, it could serve as a valuable biomarker for disease diagnosis, prognosis, or monitoring minimal residual disease after treatment. While technically challenging, cells expressing antibodies that utilize the [IGKV3D 15](/details-gene/28875) segment could potentially be targeted with highly specific anti-idiotype therapies designed to eliminate only the pathogenic B cell clones.