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Furthermore, we aimed to investigate how the identified sites were associated with methylation quantitative trait loci, gene ontology, and cardiometabolic parameters.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      In the Epigenetics in pregnancy (EPIPREG) sample we quantified maternal DNA methylation in peripheral blood leukocytes in gestational week 28 with Illumina\u2019s MethylationEPIC BeadChip. In women with European (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u2009303) and South Asian (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u2009164) ancestry, we performed an epigenome-wide association study of BMI in gestational week 28 and GWG between gestational weeks 15 and 28 using a meta-analysis approach. Replication was performed in the Norwegian Mother, Father, and Child Cohort Study, the Study of Assisted Reproductive Technologies (MoBa-START) (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u2009877, mainly European\/Norwegian).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      We identified one CpG site significantly associated with GWG (\n                      <jats:italic>p<\/jats:italic>\n                      5.8 \u00d7 10\u22128) and five CpG sites associated with BMI at gestational week 28 (\n                      <jats:italic>p<\/jats:italic>\n                      from 4.0 \u00d7 10\u20138 to 2.1 \u00d7 10\u201310). Of these, we were able to replicate three in MoBa-START; cg02786370, cg19758958 and cg10472537. Two sites are located in genes previously associated with blood pressure and BMI. DNA methylation at the three replicated CpG sites were associated with levels of blood pressure, lipids and glucose in EPIPREG (\n                      <jats:italic>p<\/jats:italic>\n                      from 1.2 \u00d7 10\n                      <jats:sup>\u22128<\/jats:sup>\n                      to 0.04).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>We identified five CpG sites associated with BMI at gestational week 28, and one with GWG. Three of the sites were replicated in an independent cohort. Several genetic variants were associated with DNA methylation at cg02786379 and cg16733643 suggesting a genetic component influencing differential methylation. The identified CpG sites were associated with cardiometabolic traits.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>ClinicalTrials.gov registration no<\/jats:title>\n                    <jats:p>Not applicable<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1038\/s41366-024-01458-x","type":"journal-article","created":{"date-parts":[[2024,1,13]],"date-time":"2024-01-13T00:02:16Z","timestamp":1705104136000},"page":"584-593","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Epigenome-wide association study of DNA methylation in maternal blood leukocytes with BMI in pregnancy and gestational weight gain"],"prefix":"10.1038","volume":"48","author":[{"given":"J. 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J.O.O. is supported by the Norwegian Research Council (Medical Student Research Program, grant 271555\/F20). G.H.M. is supported by the Norwegian Research Council (Post doctorial mobility research grant 287198) and Nils Normans minnegave. E.O.C. and Y.L. are funded by the Research Council of Norway through its Centres of Excellence funding scheme, project number 262700. R.B.P. is supported by the European Foundation for Study of Diabetes\/Novo Nordisk Program for Diabetes Research in Europe (EFSD-NN 2017) and Swedish Research Council as PI (5200000 SEK : 2021\u20132025) Diarienummer: 2021-02623. EPIPREG is supported by the South Eastern Norway Regional Health Authority (grant number: 2019092) and the Norwegian Diabetes Association.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}]}}