We aimed to identify differential methylation of genes that could illuminate the biological mechanisms of chromium (VI) toxicity in this exposure-control study. DNA methylation was measured in blood samples collected from electroplating workers and controls using a combination of Infinium Methylation450K Chip and targeted-bisulfite sequencing. QuantiGene assay was used to detect the mRNA expression of differentially methylated genes. Inductively coupled plasma-mass spectrometry was used to quantify metals in blood and urine samples. The cytosine-phosphate-guanine sites methylation and gene expression were confirmed in a human lymphoblastoid cell line. A total of 131 differentially methylated cytosine-phosphate-guanine sites were found between exposures and controls. DNA methylation of may serve as a potential biomarker for chromium (VI) exposure.
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