Exposure to aflatoxin B1 in utero is associated with DNA methylation in white blood cells of infants in The Gambia.


Hernandez-Vargas, H; Castelino, J; Silver, MJ; Dominguez-Salas, P; Cros, MP; Durand, G; Le Calvez-Kelm, F; Prentice, AM; Wild, CP; Moore, SE; Hennig, BJ; Herceg, Z; Gong, YY; Routledge, MN; (2015) Exposure to aflatoxin B1 in utero is associated with DNA methylation in white blood cells of infants in The Gambia. International journal of epidemiology, 44 (4). pp. 1238-48. ISSN 0300-5771 DOI: 10.1093/ije/dyv027

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Abstract

BACKGROUND: Exposure to environmental toxins during embryonic development may lead to epigenetic changes that influence disease risk in later life. Aflatoxin is a contaminant of staple foods in sub-Saharan Africa, is a known human liver carcinogen and has been associated with stunting in infants.<br/> METHODS: We have measured aflatoxin exposure in 115 pregnant women in The Gambia and examined the DNA methylation status of white blood cells from their infants at 2-8 months old (mean 3.6 ± 0.9). Aflatoxin exposure in women was assessed using an ELISA method to measure aflatoxin albumin (AF-alb) adducts in plasma taken at 1-16 weeks of pregnancy. Genome-wide DNA methylation of infant white blood cells was measured using the Illumina Infinium HumanMethylation450beadchip.<br/> RESULTS: AF-alb levels ranged from 3.9 to 458.4 pg/mg albumin. We found that aflatoxin exposure in the mothers was associated to DNA methylation in their infants for 71 CpG sites (false discovery rate < 0.05), with an average effect size of 1.7% change in methylation. Aflatoxin-associated differential methylation was observed in growth factor genes such as FGF12 and IGF1, and immune-related genes such as CCL28, TLR2 and TGFBI. Moreover, one aflatoxin-associated methylation region (corresponding to the miR-4520b locus) was identified.<br/> CONCLUSIONS: This study shows that maternal exposure to aflatoxin during the early stages of pregnancy is associated with differential DNA methylation patterns of infants, including in genes related to growth and immune function. This reinforces the need for interventions to reduce aflatoxin exposure, especially during critical periods of fetal and infant development.<br/>

Item Type: Article
Faculty and Department: Faculty of Epidemiology and Population Health > Dept of Population Health (2012- ) > Dept of Nutrition and Public Health Interventions Research (2003-2012)
Faculty of Epidemiology and Population Health > Dept of Population Health (2012- )
Research Centre: Centre for Maternal, Reproductive and Child Health (MARCH)
PubMed ID: 25855716
Web of Science ID: 363061500022
URI: http://researchonline.lshtm.ac.uk/id/eprint/2145780

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