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In: Statistica Neerlandica, Band 15, Heft 2, S. 147-151
ISSN: 1467-9574
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In: Statistica Neerlandica, Band 15, Heft 2, S. 147-151
ISSN: 1467-9574
In: Parmar , P , Lowry , E , Cugliari , G , Suderman , M , Wilson , R , Karhunen , V , Andrew , T , Wiklund , P , Wielscher , M , Guarrera , S , Teumer , A , Lehne , B , Milani , L , de Klein , N , Mishra , P , Melton , P , Mandaviya , P , Kasela , S , Nano , J , Zhang , W , Zhang , Y , Uitterlinden , A , Peters , A , Schottker , B , Gieger , C , Anderson , D , Boomsma , D , Grabe , H , Panico , S , Veldink , J , van Meurs , J , van den Berg , L , Beilin , L , Franke , L , Loh , M , van Greevenbroek , M , Nauck , M , Kahonen , M , Hurme , M , Raitakari , O , Franco , O , Slagboom , P , van der Harst , P , Kunze , S , Felix , S , Zhang , T , Chen , W , Mori , T , Bonnefond , A , Heijmans , B , Muka , T , Kooner , J , Fischer , K , Waldenberger , M , Froguel , P , Huang , R , Lehtimaki , T , Rathman , W , Relton , C , Matullo , G , Brenner , H , Verweij , N , Li , S , Chambers , J , Jarvelin , M-R & Sebert , S 2018 , ' Association of maternal prenatal smoking GFI1-locus and cardio-metabolic phenotypes in 18,212 adults ' , EBioMedicine , vol. 38 , pp. 206-216 . https://doi.org/10.1016/j.ebiom.2018.10.066
Background:DNA methylation at theGFI1-locus has been repeatedly associated with exposure to smoking fromthe foetal period onwards. We explored whether DNA methylation may be a mechanism that links exposure tomaternal prenatal smoking with offspring's adult cardio-metabolic health.Methods:We meta-analysed the association between DNA methylation atGFI1-locus with maternal prenatalsmoking, adult own smoking, and cardio-metabolic phenotypes in 22 population-based studies from Europe,Australia, and USA (n= 18,212). DNA methylation at theGFI1-locus was measured in whole-blood. Multivari-able regression models werefitted 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), fastingglucose (FG), high-density lipoprotein cholesterol (HDL—C), triglycerides (TG), diastolic, and systolic blood pres-sure (BP).Findings:Lower DNA methylation at three out of eightGFI1-CpGs was associated with exposure to maternal pre-natal smoking, whereas, all eight CpGs were associated with adult own smoking. Lower DNA methylation atcg14179389, the strongest maternal prenatal smoking locus, was associated with increased WC and BP when ad-justed for sex, age, and adult smoking with Bonferroni-correctedPb0·012. In contrast, lower DNA methylationatcg09935388,thestrongest adultownsmokinglocus, wasassociated with decreasedBMI, WC,and BP (adjusted1×10−7bPb0.01). Similarly, lower DNA methylation at cg12876356, cg18316974, cg09662411, andcg18146737 was associated with decreased BMI and WC (5 × 10−8bPb0.001). Lower DNA methylation at allthe CpGs was consistently associated with higher TG levels.Interpretation:Epigenetic changes at theGFI1were linked to smoking exposurein-utero/in-adulthood and ro-bustly associated with cardio-metabolic risk factors.Fund:European Union's Horizon 2020 research and innovation programme under grant agreement no. 633595DynaHEALTH.
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This is the final version of the article. Available from Springer Nature via the DOI in this record. ; Raw data were submitted to the European Genome-phenome Archive (EGA) under accession EGAS00001001077. ; X-chromosome inactivation (XCI), i.e., the inactivation of one of the female X chromosomes, restores equal expression of X-chromosomal genes between females and males. However, ~10% of genes show variable degrees of escape from XCI between females, although little is known about the causes of variable XCI. Using a discovery data-set of 1867 females and 1398 males and a replication sample of 3351 females, we show that genetic variation at three autosomal loci is associated with female-specific changes in X-chromosome methylation. Through cis-eQTL expression analysis, we map these loci to the genes SMCHD1/METTL4, TRIM6/HBG2, and ZSCAN9. Low-expression alleles of the loci are predominantly associated with mild hypomethylation of CpG islands near genes known to variably escape XCI, implicating the autosomal genes in variable XCI. Together, these results suggest a genetic basis for variable escape from XCI and highlight the potential of a population genomics approach to identify genes involved in XCI. ; This research was financially supported by several institutions: BBMRI-NL, a Research Infrastructure financed by the Dutch government (NWO, numbers 184.021.007 and 184.033.111); the UK Medical Research Council; Wellcome (www.wellcome.ac.uk; [grant number 102215/2/13/2 to ALSPAC]); the University of Bristol to ALSPAC; the UK Economic and Social Research Council (www.esrc.ac.uk; [ES/N000498/1] to CR); the UK Medical Research Council (www.mrc.ac.uk; grant numbers [MC_UU_12013/1, MC_UU_12013/2 to JLM, CR]); the Helmholtz Zentrum München – German Research Center for Environmental Health, which is funded by the German Federal Ministry of Education and Research (BMBF) and by the State of Bavaria; the Munich Center of Health Sciences (MC-Health), Ludwig-Maximilians-Universität, as part of LMUinnovativ; the Wellcome Trust, Medical Research Council, European Union (EU), and the National Institute for Health Research (NIHR)- funded BioResource, Clinical Research Facility, and Biomedical Research Centre based at Guy's and St Thomas' NHS Foundation Trust in partnership with King's College London.
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Abstract 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.
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