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  • ENVPOL-D-20-02687 MS

    Rights statement: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Environmental Science and Technology, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.est.0c01696

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    Embargo ends: 8/12/21

    Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License

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DNA Methylation Biomarkers of IQ Reduction are Associated with Long-term Lead Exposure in School Aged Children in Southern China

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  • C. Wan
  • S. Pan
  • L. Lin
  • J. Li
  • G. Dong
  • K.C. Jones
  • F. Liu
  • D. Li
  • J. Liu
  • Z. Yu
  • G. Zhang
  • H. Ma
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<mark>Journal publication date</mark>5/01/2021
<mark>Journal</mark>Environmental Science and Technology
Issue number1
Volume55
Number of pages11
Pages (from-to)412-422
Publication StatusPublished
Early online date8/12/20
<mark>Original language</mark>English

Abstract

Although lead associated with intelligence decline in children has long been reported, studies combining intelligence determination, molecular mechanisms exploration, and biomarker screen are quite rare. In this study, based on 333 children aged 9-11, we determined the role of DNA methylation (DNAm) in the relationship of lead exposure with children's intelligence. DNAm was measured from children's blood DNA specimens, and mediation analysis was performed to identify DNAm biomarkers mediating the lead-intelligence relationship. We identified forty-three differentially methylated regions (DMRs), and two fragments (FAM50B1 and PTCHD3) significantly mediated the lead-intelligence relationship, with contribution rates of 30.36% (p = 0.010) and 60.36% (p <0.001), respectively. In addition, blood lead levels (BLLs) lower than 100 μg/L still adversely affected children's IQs and DNAm of the two fragments. Our data suggests that DNAm mediates lead-associated cognitive delay in children and blood lead reference value for school-aged children (100 μg/L) should be revised, and the candidate biomarkers can be used in related neurological diseases in future. 

Bibliographic note

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Environmental Science and Technology, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.est.0c01696