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Updated: Apr 12, 2026

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
Published on: November 3, 2010
Associations between AhR gene polymorphisms and expression in agent orange/dioxin exposed individuals
Ha Van Quang1, Bach Thu Trang2, Bui Lan Anh3
1Department of Haematology, Toxicology, Radiation, and Occupation, 103 Military Hospital, Vietnam Military Medical University, Hanoi, Vietnam.
Agent Orange/dioxin exposure in Vietnam is linked to altered Aryl hydrocarbon Receptor (AhR) mRNA expression. Specific AhR gene polymorphisms influence dioxin accumulation, suggesting genetic susceptibility in affected populations.
Area of Science:
- Environmental Toxicology
- Human Genetics
- Molecular Epidemiology
Background:
- Agent Orange/dioxin exposure poses significant health risks.
- The Aryl hydrocarbon Receptor (AhR) pathway is crucial for dioxin metabolism.
- Genetic variations in the AhR gene may influence individual susceptibility to dioxins.
Purpose of the Study:
- To investigate the association between specific AhR gene polymorphisms (rs2158041 and rs6960165) and AhR mRNA expression.
- To evaluate the relationship between these polymorphisms, AhR mRNA levels, and accumulated dioxin concentrations in a Vietnamese population.
- To identify potential mechanisms of genetic susceptibility to Agent Orange/dioxin.
Main Methods:
- Genotyping for AhR polymorphisms rs2158041 and rs6960165.
- Quantification of AhR mRNA expression levels.
- Measurement of serum concentrations of 2,3,7,8-TCDD and total PCDD/PCDFs in 100 exposed individuals and 100 controls.
Main Results:
- AhR mRNA expression was significantly higher in the exposed group compared to controls (p<0.001).
- Homozygous recessive genotypes (rs2158041GG, rs6960165TT) were associated with the lowest AhR mRNA expression.
- Heterozygous genotypes (rs2158041AG, rs6960165CT) showed significant association with higher serum concentrations of 2,3,7,8-TCDD and total PCDD/PCDFs.
- Moderate positive correlations were found between AhR mRNA levels and dioxin concentrations (r=0.502–0.541).
Conclusions:
- AhR polymorphisms influence AhR inducibility and dioxin elimination efficiency.
- Genetic variants impairing AhR sensing may promote dioxin accumulation.
- This study highlights a mechanism of genetic susceptibility in Agent Orange/dioxin-exposed populations in Vietnam.
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