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Environ Int. 2018 Apr;113:133-142. doi: 10.1016/j.envint.2018.01.015. Epub 2018 Feb 6.

Serum homocysteine, arsenic methylation, and arsenic-induced skin lesion incidence in Bangladesh: A one-carbon metabolism candidate gene study.

Author information

1
Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, USA. Electronic address: megan.niedzwiecki@mssm.edu.
2
Department of Biostatistics, Mailman School of Public Health, Columbia University, New York, NY, USA.
3
Department of Pediatrics, University of Texas at Austin Dell Medical School, Austin, TX, USA.
4
Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY, USA.
5
Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, USA.
6
Columbia University Arsenic Project in Bangladesh, Dhaka, Bangladesh.
7
Department of Public Health Sciences, University of Chicago, Chicago, IL, USA.
8
University of Chicago Research Bangladesh, Dhaka, Bangladesh.
9
Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, USA. Electronic address: mvg7@cumc.columbia.edu.

Abstract

BACKGROUND:

Inorganic arsenic (As) is methylated via one carbon metabolism (OCM) to mono- and dimethylated arsenicals (MMA and DMA), facilitating urinary excretion. Hyperhomocysteinemia (HHcys), a marker of impaired OCM, is a risk factor for As-induced skin lesions, but the influences of single nucleotide polymorphisms (SNPs) in OCM genes on Hcys, As metabolism and skin lesion risk is unclear.

OBJECTIVES:

To (i) explore genetic sources of Hcys and the causal role of HHcys in As-induced skin lesion development using OCM genetic proxies for HHcys and (ii) identify OCM SNPs associated with urinary As metabolite proportions and/or skin lesion incidence.

METHODS:

We conducted a case-control study nested in the Health Effects of Arsenic Longitudinal Study (HEALS) in Bangladesh which 876 incident skin lesion cases were matched to controls on sex, age, and follow-up time. We measured serum Hcys, urinary As metabolites, and 26 SNPs in 13 OCM genes.

RESULTS:

Serum Hcys and urinary %DMA were independently associated with increased and decreased odds of skin lesions, respectively. The T allele of MTHFR 677 C ➔ T (rs1801133) was associated with HHcys, higher %MMA, and lower %DMA, but not with skin lesions. Interactions between SNPs and water As on skin lesion risk were suggestive for three variants: the G allele of MTRR rs1801394 and T allele of FOLR1 rs1540087 were associated with lower odds of skin lesions with lower As (≤50 μg/L), and the T allele of TYMS rs1001761 was associated with higher odds of skin lesions with higher As.

CONCLUSIONS:

While HHcys and decreased %DMA were associated with increased risk for skin lesions, and MTHFR 677 C ➔ T was a strong predictor of HHcys, MTHFR 677 C ➔ T was not associated with skin lesion risk. Future studies should explore (i) non-OCM and non-genetic determinants of Hcys and (ii) if genetic findings are replicated in other As-exposed populations, mechanisms by which OCM SNPs may influence the dose-dependent effects of As on skin lesion risk.

KEYWORDS:

Arsenic; Arsenic metabolism; Gene-environment interaction; Homocysteine; One-carbon metabolism; Skin lesions

PMID:
29421402
PMCID:
PMC5873983
[Available on 2019-04-01]
DOI:
10.1016/j.envint.2018.01.015

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