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The Potential effect of G915C polymorphism in regulating TGF-β1 transport into Endoplasmic Reticulum for cytokine
Hani Susianti1, Atma Gunawan2, Jayarani Fatimah Putri3
1Departement of Clinical Pathology, Faculty of Medicine, Brawijaya University, Malang, Indonesia.
The G915C polymorphism in TGF-β1 may reduce cytokine production in Lupus Nephritis by altering signal peptide properties, hindering transport into the endoplasmic reticulum and lowering urinary TGF-β1 levels.
Area of Science:
- Molecular Biology
- Immunology
- Nephrology
Background:
- Elevated transforming growth factor-beta 1 (TGF-β1) cytokine concentrations are linked to nephritis severity, particularly in Lupus Nephritis.
- The G915C polymorphism is associated with TGF-β1 production, making it a relevant genetic factor to investigate.
Purpose of the Study:
- To investigate the impact of the G915C polymorphism on TGF-β1 signal peptide properties.
- To assess the effect of this polymorphism on TGF-β1 transport into the endoplasmic reticulum.
- To determine the correlation between the G915C polymorphism and urinary TGF-β1 concentrations in Lupus Nephritis patients.
Main Methods:
- Analysis of the G915C polymorphism's effect on codon 25 of the TGF-β1 signal peptide, substituting arginine with proline.
- Evaluation of changes in signal peptide polarity, hydrophobicity, and binding energy to the Signal Recognition Particle (SRP) and translocon.
- Measurement of urinary TGF-β1 concentrations in Lupus Nephritis patients.
Main Results:
- The arginine to proline substitution at codon 25 decreased the TGF-β1 signal peptide's polarity.
- Increased hydrophobicity and binding energy to SRP and translocon were observed, suggesting reduced protein complex stability.
- These changes imply a potential blockage of TGF-β1 transport into the endoplasmic reticulum.
Conclusions:
- The G915C polymorphism may inhibit TGF-β1 transport into the endoplasmic reticulum due to altered signal peptide properties.
- This transport retention could impair TGF-β1 synthesis and maturation, leading to decreased cytokine production.
- The findings suggest a mechanism by which G915C polymorphism influences TGF-β1 levels in Lupus Nephritis.
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