Factors Affecting Differential Methylation of DNA Promoters in Arsenic-Exposed Populations

Biological Trace Element Research
Yanting ZhangDianjun Sun

Abstract

The exposure/biotransformation of inorganic arsenic (iAs) may perturb DNA methylation patterns and subsequently influence disease risk by altering the expression of key genes. Interindividual variation in patterns of DNA methylation can be explained by the influence of environmental, genetic, and stochastic factors. Here, we examined promoter DNA methylation levels with urinary arsenical concentrations and investigated the genetic and nongenetic determinants of DNA methylation in 105 samples collected from populations in Shanxi Province, China, with high levels of arsenic in drinking water. Arsenic concentrations in water were determined by atomic absorption spectrophotometry (AA-6800, Shimadzu Co., Kyoto, Japan). Urine samples were measured using an atomic absorption spectrophotometer with an arsenic speciation pretreatment system (ASA-2sp, Shimadzu Co. Kyoto, Japan) for detection. Gene-specific (CDH1, EREG, ERCC2, GSTP1, and MGMT) DNA methylation was quantified by targeted bisulfite sequencing. Single-nucleotide polymorphism (SNP) genotyping was performed using a custom-by-design 2 × 48-Plex SNPscan™ Kit. These results revealed CDH1 with promoter DNA methylation levels associated with iAs. After the exclusion of confounding f...Continue Reading

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Citations

Dec 25, 2019·Environmental Science and Pollution Research International·Jorge Alejandro Alegría-TorresDiana Rocha-Amador
Oct 10, 2020·Environmental Geochemistry and Health·Mengjie WangYuefeng He
Jun 5, 2021·Journal of Trace Elements in Medicine and Biology : Organ of the Society for Minerals and Trace Elements (GMS)·Jin ChengDianjun Sun

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Methods Mentioned

BETA
deamination
atomic absorption
atomic absorption spectrophotometry
atomic absorption spectrometry
Assay
PCR
electrophoresis
genotyping

Software Mentioned

SPSS

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