Details for: SBK2

Gene ID: 646643

Gene Type:  Protein-coding  - A gene that serves as a template for producing a messenger RNA (mRNA) molecule, which is then translated into a functional protein.

Symbol: SBK2

Ensembl ID: ENSG00000187550

Description: SH3 domain binding kinase family member 2

Cell Significance Landscape

Associated with

Significant Cells

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

  • cardiac muscle cell CL0000746
    CSI 5.06
    rCSI 7.26%
    PRS 99.78

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 Size: Proportional to Target Cell CSI magnitude
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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 [SBK2](/details-gene/646643), or SH3 domain binding kinase family member 2, is a protein-coding gene located on chromosome 19q13.42. Functionally, it is annotated as a protein serine kinase involved in crucial cellular processes including [protein phosphorylation](/details-go/GO:0006468), the [MAPK cascade](/details-go/GO:0000165), and [chromatin remodeling](/details-go/GO:0006338). Expression data indicates a significant role for [SBK2](/details-gene/646643) within [cardiac muscle cells](/details-cell/CL0000746), suggesting a specialized function in the context of cardiac biology. ## Cellular Roles and Expression Landscape **Overall**, the expression profile of [SBK2](/details-gene/646643) is characterized by its high significance in [cardiac muscle cells](/details-cell/CL0000746), where it shows a Cell Significance Index (CSI) of 5.06. This strong association suggests that [SBK2](/details-gene/646643) is a key functional component of cardiomyocytes. Given its role as a kinase involved in signaling and chromatin regulation, its prominent expression in this cell type may be linked to maintaining the unique physiological and transcriptional state of heart muscle, potentially related to processes like contractility, metabolism, or stress responses. Without data on its expression in other cell types, its specificity remains to be fully defined, but the current evidence points towards a primary role in the cardiovascular system. ## Pathways and Molecular Function The molecular functions attributed to [SBK2](/details-gene/646643) are consistent with its identity as a signaling and regulatory protein. As a kinase, it utilizes [ATP binding](/details-go/GO:0005524) to catalyze [protein serine kinase activity](/details-go/GO:0106310). Its participation in the [MAPK cascade](/details-go/GO:0000165) positions it as a component of a major signaling network that governs cellular responses to a wide array of stimuli, including proliferation, differentiation, and apoptosis. This function is particularly relevant in [cardiac muscle cells](/details-cell/CL0000746), where MAPK signaling is a critical mediator of both physiological and pathological cardiac hypertrophy. Furthermore, [SBK2](/details-gene/646643) is implicated in epigenetic regulation through its involvement in [chromatin remodeling](/details-go/GO:0006338) and its specific [histone H2AS1 kinase activity](/details-go/GO:0044024). This suggests that [SBK2](/details-gene/646643) may influence gene expression programs in [cardiac muscle cells](/details-cell/CL0000746) by directly modifying chromatin structure, thereby playing a role in the long-term maintenance of the cardiomyocyte phenotype or its adaptation to stress. ## Research Directions The specific and significant expression of [SBK2](/details-gene/646643) in [cardiac muscle cells](/details-cell/CL0000746), coupled with its dual function in signal transduction and chromatin modification, opens up several avenues for future investigation. **Testable Hypotheses:** 1. [SBK2](/details-gene/646643) functions as a key mediator in the MAPK-driven signaling pathway that leads to pathological cardiac hypertrophy in response to biomechanical stress or neurohormonal stimuli. 2. Through its histone H2A kinase activity, [SBK2](/details-gene/646643) is required to establish or maintain the specific epigenetic landscape that defines the terminally differentiated state of adult [cardiac muscle cells](/details-cell/CL0000746), and its dysregulation contributes to the re-expression of the fetal gene program observed in heart failure. **Proposed Experimental Approach:** To test the first hypothesis regarding the role of [SBK2](/details-gene/646643) in cardiac hypertrophy, an *in vitro* study could be conducted using human iPSC-derived cardiomyocytes or neonatal rat ventricular myocytes. [SBK2](/details-gene/646643) expression could be knocked down using siRNA or CRISPR-Cas9. These cells would then be treated with a known hypertrophic agonist, such as endothelin-1 or phenylephrine. The experimental readouts would include measuring changes in cell size via immunofluorescence microscopy, quantifying the expression of hypertrophic marker genes (*Nppa*, *Nppb*, *Myh7*) using qRT-PCR, and assessing the phosphorylation status of key downstream MAPK pathway effectors (e.g., ERK1/2, JNK, p38) by Western blot. A significant reduction in the hypertrophic response in [SBK2](/details-gene/646643)-deficient cells would support its role as a pro-hypertrophic kinase. **Therapeutic Potential:** Given its potential role in pathological cardiac signaling, [SBK2](/details-gene/646643) represents a plausible therapeutic target for heart diseases characterized by maladaptive hypertrophy and heart failure. The therapeutic strategy would likely focus on **inhibition** of its kinase activity to block downstream pro-hypertrophic signaling. The development of a highly specific small-molecule inhibitor for [SBK2](/details-gene/646643) could offer a targeted approach to mitigate cardiac remodeling. However, the success of such a strategy would depend on a thorough understanding of its broader physiological roles in the heart to avoid unintended cardiotoxic effects.