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Failed axon connections homolog, metaxin-like GST domain containing (FAXC)
- Target
- FAXC
- Molecular classification
- Other (not a classical receptor, ion channel, enzyme, transporter, transcription factor, nor histone modifier), Scaffolding/adaptor protein (involved in complex formation and signal transduction), Protein coding gene[4][5]
01
Overview
Failed axon connections homolog, metaxin-like GST domain containing (FAXC) is a conserved protein coding gene implicated in human cancer, particularly cholangiocarcinoma. Functionally, FAXC acts as a scaffold protein in mitochondria, forming a complex with annexin A2 (ANXA2) and c-SRC to enhance phosphorylation of ANXA2, thereby promoting epithelial–mesenchymal transition and hypoxia-driven signaling—processes crucial for tumorigenesis. The FAXC gene's role in mammals is still being defined; its Drosophila homolog coordinates axon bundle formation and maintenance, suggesting a broader influence on cytoskeletal and signaling pathways. FAXC is considered a candidate therapeutic target in oncology, though it lacks direct drug modulators or validated biomarkers. Clinical translation should proceed cautiously due to limited characterization of its normal physiological roles[1][2][3][4][5].
- Other names
- Failed axon connections homologMetaxin-like GST domain containingC6orf1686230409E13RikAW742931MGC2817dJ273F20RGD1562449
02
Mechanism of action
If targeted, would likely act via disruption of kinase complex formation (e.g., inhibition of FAXC/ANXA2/c-SRC complex assembly or ANXA2 phosphorylation cascade)[1]; Potential for indirect modulation of EMT and hypoxia pathways[1]
03
Biological functions
Scaffold/adaptor protein promoting formation of kinase complexes[1]Regulation of epithelial–mesenchymal transition (EMT)[1]Regulation of hypoxia response and HIF1-α expression[1]Promotion of phosphorylation events critical for tumorigenesis[1]May be involved in axon development and maintenance (in Drosophila homolog, role in central nervous system axon bundles)[2]Mitochondrial localization; possible roles in mitochondrial signaling[1]
04
Disease associations
Cancer (notably cholangiocarcinoma, with evidence for a role in tumor development; also associated in genetic associations with prostate cancer)[1][5]Potential for involvement in other malignancies with EMT or hypoxia-driven progressionNo clear evidence for roles in inflammation, infection, neurodegenerative disease, or cardiovascular disease specifically
05
Safety considerations
Not established; therapeutic targeting risk may include interference with mitochondrial function and normal kinase signaling[1]Lack of functional characterization in normal tissue suggests need for caution in therapeutic development
06
Interacting drugs
No direct interacting drugs identified as of current literature[1][5]
07
Biomarkers
FAXC expression could be considered a candidate biomarker for cholangiocarcinoma tumorigenesis and EMT/hypoxia signaling[1]No established clinical biomarkers or companion diagnostics for patient selection or efficacy monitoring[1][5]
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