Parmar P1, Lowry E1, Cugliari G2, Suderman M3, Wilson R4, Karhunen V5, Andrew T6, Wiklund P7, Wielscher M5, Guarrera S2, Teumer A8, Lehne B5, Milani L9, de Klein N10, Mishra PP11, Melton PE12, Mandaviya PR13, Kasela S14, Nano J15, Zhang W16, Zhang Y17, Uitterlinden AG18, Peters A19, Schöttker B20, Gieger C19, Anderson D21, Boomsma DI22, Grabe HJ23, Panico S24, Veldink JH25, van Meurs JBJ13, van den Berg L25, Beilin LJ26, Franke L10, Loh M27, van Greevenbroek MMJ28, Nauck M29, Kähönen M30, Hurme MA31, Raitakari OT32, Franco OH33, Slagboom PE34, van der Harst P35, Kunze S4, Felix SB36, Zhang T37, Chen W38, Mori TA26, Bonnefond A39, Heijmans BT34; BIOS Consortium, Muka T33, Kooner JS40, Fischer K14, Waldenberger M19, Froguel P39, Huang RC21, Lehtimäki T11, Rathmann W41, Relton CL3, Matullo G2, Brenner H20, Verweij N42, Li S43, Chambers JC44, Järvelin MR45, Sebert S46; GLOBAL Meth QTL Consortium.
Medicine. 2018 Dec;38:206-216. doi: 10.1016/j.ebiom.2018.10.066. Epub 2018 Nov 13. PMID 30442561
Background: DNA methylation at the GFI1-locus has been repeatedly associated with exposure to smoking from the foetal period onwards. We explored whether DNA methylation may be a mechanism that links exposure to maternal prenatal smoking with offspring's adult cardio-metabolic health.
Methods: We meta-analysed the association between DNA 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 = 18,212). DNA methylation at the GFI1-locus was measured in whole-blood. Multivariable regression models 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: Lower DNA methylation at three out of eight GFI1-CpGs was associated with exposure to maternal prenatal smoking, whereas, all eight CpGs were associated with adult own smoking. Lower DNA methylation at cg14179389, 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, lower DNA methylation at cg09935388, the strongest adult own smoking locus, was associated with decreased BMI, WC, and BP (adjusted 1 × 10-7 < P < 0.01). Similarly, lower DNA methylation at cg12876356, cg18316974, cg09662411, and cg18146737 was associated with decreased BMI and WC (5 × 10-8 < P < 0.001). Lower DNA methylation at all the CpGs was consistently associated with higher TG levels.
Interpretation: Epigenetic changes at the GFI1 were linked to smoking exposure in-utero/in-adulthood and robustly associated with cardio-metabolic risk factors. FUND: European Union's Horizon 2020 research and innovation programme under grant agreement no. 633595 DynaHEALTH.