Abstract
This study aims to evaluate the association of maternal DNA methylation (DNAm) during pregnancy and offspring birthweight. One hundred twenty-two newborn-mother dyads from the Isle of Wight (IOW) cohort were studied to identify differentially methylated cytosine-phosphate-guanine sites (CpGs) in maternal blood associated with offspring birthweight. Peripheral blood samples were drawn from mothers at 22–38 weeks of pregnancy for epigenome-wide DNAm assessment using the Illumina Infinium HumanMethylation450K array. Candidate CpGs were identified using a course of 100 repetitions of a training and testing process with robust regressions. CpGs were considered informative if they showed statistical significance in at least 80% of training and testing samples. Linear mixed models adjusting for covariates were applied to further assess the selected CpGs. The Swedish Born Into Life cohort was used to replicate our findings (n = 33). Eight candidate CpGs corresponding to the genes LMF1, KIF9, KLHL18, DAB1, VAX2, CD207, SCT, SCYL2, DEPDC4, NECAP1, and SFRS3 in mothers were identified as statistically significantly associated with their children’s birthweight in the IOW cohort and confirmed by linear mixed models after adjusting for covariates. Of these, in the replication cohort, three CpGs (cg01816814, cg23153661, and cg17722033 with p values = 0.06, 0.175, and 0.166, respectively) associated with four genes (LMF1, VAX2, CD207, and NECAP1) were marginally significant. Biological pathway analyses of three of the genes revealed cellular processes such as endocytosis (possibly sustaining an adequate maternal-fetal interface) and metabolic processes such as regulation of lipoprotein lipase activity (involved in providing substrates for the developing fetus). Our results contribute to an epigenetic understanding of maternal involvement in offspring birthweight. Measuring DNAm levels of maternal CpGs may in the future serve as a diagnostic tool recognizing mothers at risk for pregnancies ending with altered birthweights.
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Data Availability
Data used in this study may be available upon request from the authors with permission from the IOW and Born Into Life cohorts.
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Funding
This work has been supported by National Institute of Allergy and Infectious Diseases [R01 AI091905] and the National Heart, Lung, and Blood Institute [R01 HL132321] to W.K and [R01 HL082925] to SHA. The Born Into Life cohort was supported by the Swedish Research Council, the Swedish Foundation for Strategic Research, the Swedish Heart-Lung Foundation and Department of Clinical Sciences, Karolinska Institutet, Danderyd University Hospital, Stockholm, Sweden. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health, USA.
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The IOW study was approved repeatedly by the local research ethics committee (NRES Committee South Central—Hampshire B, UK) and the University of Memphis Institutional Review Board in Memphis, USA (FWA00006815). Ethical approval was obtained by the Regional Ethics Review Board in Stockholm, Sweden, for the Born Into Life study.
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Written consents were obtained from all participants of the IOW and Born Into Life cohorts at recruitment and follow-ups.
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Supplementary fig. 1
Structural equation modeling graphs showing the total effect of maternal DNAm on birthweight, indirect effect of maternal DNAm on birthweight through gestational age, and the direct effects between maternal DNAm, gestational age, and birthweight. Models are adjusted for newborn’s gender, maternal peripheral blood cell types, maternal BMI, smoking during pregnancy, and socioeconomic status. Results are shown as beta values*100 (percentage) *0.001 ≤ P value < 0.05, **P value < 0.001(PUB 174 kb)
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Kheirkhah Rahimabad, P., Arshad, S.H., Holloway, J.W. et al. Association of Maternal DNA Methylation and Offspring Birthweight. Reprod. Sci. 28, 218–227 (2021). https://doi.org/10.1007/s43032-020-00281-9
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DOI: https://doi.org/10.1007/s43032-020-00281-9