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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.
None:
This study aimed to evaluate the association between two AHR gene polymorphisms (rs2158041 and rs6960165), AhR mRNA expression, and accumulated dioxin concentrations in exposed individuals in Vietnam. We enrolled 100 individuals exposed to Agent Orange/dioxin and 100 healthy controls. AhR mRNA expression was significantly higher in the exposed group than in controls (p < 0.001). Individuals carrying homozygous recessive genotypes (rs2158041GG and rs6960165TT) exhibited the lowest AhR mRNA expression across both groups. Conversely, the highest serum concentrations of 2,3,7,8-TCDD and total PCDD/PCDFs were significantly associated with the heterozygous genotypes (rs2158041AG and rs6960165CT). Moderate positive correlations were observed between AhR mRNA levels and 2,3,7,8-TCDD (r = 0.541), total PCDDs (r = 0.519), and total PCDD/PCDFs (r = 0.502). In conclusion, AhR polymorphisms appear to influence AhR inducibility and dioxin elimination efficiency. Genetic variants that impair AhR sensing may promote dioxin accumulation, highlighting a mechanism of genetic susceptibility in Agent Orange/dioxin-exposed populations in Vietnam.
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