In:
Journal of Medicine and Pharmacy, Hue University of Medicine and Pharmacy
Abstract:
Introduction: Agent Orange was the most extensively used among herbicides sprayed on Vietnam territory during the Vietnam War. Its by-product, 2,3,7,8-tetrachlorodibenzo-paradioxin (Dioxin), is an extremely toxic and persistent chemical. The effects of this spraying on both Vietnamese and United States Veterans health has been reported in many publications. However, there wasn’t any study of the effects at the molecular level of the residual Dioxin in the environment on present Vietnamese civilians living in contaminated areas.
Objective: To investigate the association between residual Agent Orange/Dioxin in the environment and the alterations of DNA methylation in the peripheral blood of the present day Vietnamese population living in spraying areas. Methods: Cross-sectional study. The subjects were 188 individuals who came to Hue University Hospital for health care: 94 individuals for case group from sprayed areas (A Luoi and Nam Dong, Thua Thien Hue Province), and 94 individuals for the control group from non-sprayed areas (Quang Binh to North Vietnam). MALDI-TOF MS technique was used to detect the alterations of DNA methylation of CYP1A1 gene. Results: Among 22 CpG position of CYP1A1 gene were investigated, there were the DNA hypomethylation at CpG_2.3.4, CpG_5, CpG_12.13 in case group compared to the control (p 〈 0.05). After dividing case group into 2 subgroups, we found the significant DNA hypomethylation at CpG_2.3.4, CpG_5, CpG_9, CpG_10, CpG_11, CpG_12.13, CpG_17, CpG_18.19 in subgroup CASES_F_P compared to CASES_NON_F_P also control group (p 〈 0.05).
Conclusions: Individuals living in A Luoi and Nam Dong– the Dioxin contaminated areas– had DNA hypomethylation in CYP1A1 gene. The DNA hypomethylation seem not due to the effects of residual Dioxin in the environment in present day, it was likely to be inherited by epigenetic way from the DNA methylation alterations on their parents who had directly exposure to that spraying. This theory should be verified through extensive studies with CASES_F_P family and more genes will be investigated. Key words: Agent Orange, Dioxin, DNA methylation, CYP1A1
Type of Medium:
Online Resource
ISSN:
1859-3836
DOI:
10.34071/jmp.2018.2.10
Language:
Vietnamese
Publisher:
Hue University of Medicine and Pharmacy
Publication Date:
2018
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