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Target intelligence / Profile preview
Histone H2A.J (H2AJ)
- Target
- H2AJ
- Molecular classification
- Histone, Chromatin protein, Histone variant, Nuclear protein, Other
01
Overview
Histone H2A.J is a replication-independent variant of the H2A histone family, structurally divergent at its C-terminus compared to canonical H2A. It serves as a core nucleosomal component, influencing chromatin compaction and accessibility, regulation of gene expression, and stability in the genome. H2A.J accumulates during cellular senescence, particularly after DNA damage such as radiation, modulating the epigenetic landscape and inflammatory gene expression. While not a direct therapeutic target, H2A.J’s role in tissue response to injury, senescence-associated secretory phenotype, and potential involvement in cancer biology underscores its importance as an indirect modulator of disease processes
- Other names
- H2AJH2AFJHistone H2A.JH2A histone family member JH2a/jFLJ10903MGC921buforin I
02
Mechanism of action
Not applicable directly, as H2A.J is not a direct drug target. Mechanisms may relate to chromatin accessibility modification by histone-modifying drugs
03
Biological functions
Chromatin structure organizationRegulation of nucleosome assemblyEpigenetic regulationModulation of gene expression, especially inflammatory gene expression in senescenceDNA repair participation through chromatin remodeling
04
Disease associations
Cancer (modulation of senescence, potential radioresistance, and malignant transformation)Inflammation (regulates inflammatory gene expression in senescent cells)Pulmonary fibrosis and lung injury (role in radiation-induced lung tissue injury)Other (general stress response, cell fate in aging and tissue injury)
05
Safety considerations
Not applicable directly, as H2A.J is not a current therapeutic target. Indirect concerns relate to its regulation in cancer and inflammation, where altered H2A.J function may contribute to unwanted cell proliferation or tissue injury
06
Interacting drugs
None directly. No drugs are known to directly target Histone H2A.J specifically, though global histone modifiers (e.g., HDAC inhibitors) may indirectly affect its function or incorporation
07
Biomarkers
Increased H2A.J protein or mRNA may serve as a biomarker of senescence, especially after radiation exposureMay be useful for monitoring radiation-induced tissue injury or inflammatory states
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