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• W3049755004 abstract "Background: DNA methylation at GFI1-locus has been repeatedly associated with exposure to smoking from foetal period onwards. We explored whether DNA methylation maybe a mechanism that links exposure to maternal prenatal smoking with offspring's adult cardio-metabolic health. Methods: We meta-analysed the association between methylation at GFI1-locus with maternal prenatal smoking, adult own smoking, and cardio-metabolic phenotypes in 22 population-based studies from Europe, Australia, and USA (n=18212). DNA methylation at GFI1-locus was measured in whole-blood. Multivariable regression analyses were fitted to examine its association with exposure to prenatal and own adult smoking. DNA methylation levels were analysed in relation to body mass index (BMI), waist circumference (WC), fasting glucose (FG), high-density lipoprotein cholesterol (HDL-C), triglycerides (TG), diastolic, and systolic blood pressure (BP). Findings: Hypomethylation at four out of eight GFI1-CpGs was associated with exposure to maternal prenatal smoking, whereas, all eight CpGs were associated with adult own smoking. Cg14179389 hypomethylation, the strongest maternal prenatal smoking locus, was associated with increased WC and BP when adjusted for sex, age, and adult smoking with Bonferroni-corrected P < 0·012. In contrast, hypomethylation at cg09935388, the strongest adult own smoking locus, was associated with decreased BMI, WC, and BP (adjusted 1 x 10 - 7 < P < 0·01). Similarly, hypo-methylation at cg12876356, cg18316974, cg09662411, and cg18146737 was associated with decreased BMI and WC (5 x 10 - 8 < P < 0·001). Hypomethylation at all the CpGs was consistently associated with higher TG levels. Interpretation: Epigenetic changes at GFI1 were linked to smoking exposure in-utero/in-adulthood and robustly associated with cardio-metabolic risk factors. This introduces a molecular mechanism and biomarker of smoking exposure. Funding: Not applicable Declaration of interests: The authors declare no competing interests. Ethical Approval Statement: Ethical approval for the study was obtained from the ALSPAC Ethics and Law Committee and the Local Research Ethics Committees." @default.
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• W3049755004 date "2018-01-01" @default.
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• W3049755004 title "Meta-Analysis of Maternal Prenatal Smoking GFI1-Locus and Cardio-Metabolic Phenotypes in Adults" @default.
• W3049755004 doi "https://doi.org/10.2139/ssrn.3237007" @default.
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