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. 2025 Jun 6.
doi: 10.1289/EHP16303. Online ahead of print.

Prenatal Smoking Exposures and Epigenome-wide Methylation in Newborn Blood

Thanh T Hoang  1   2   3   4 Marta Cosin-Tomas  5   6   7 Yunsung Lee  8 Giulietta Monasso  9   10 Zongli Xu  11 Sebastian Shaobo Li  12 Xuehuo Zeng  13 Anne P Starling  14   15 Brigitte Reimann  16 Stefan Röder  17 Lea Zillich  18 Dereje D Jima  19   20 Chris H L Thio  21 Giancarlo Pesce  22   23 Elin T G Kersten  24   25 Charles E Breeze  26 Adam B Burkholder  27 Mikyeong Lee  1 James M Ward  28 Bios ConsortiumRossella Alfano  16 Michael Deuschle  29 Liesbeth Duijts  30   31 Akhgar Ghassabian  32   33 Laura-Concepció Gómez Herrera  5   16   34 Vincent Wv Jaddoe  9   10 Alison A Motsinger-Reif  11 Rolv T Lie  8   35 Tim S Nawrot  36   37 Christian M Page  38 Tabea S Send  29 Gemma Sharp  39 Dan J Stein  40   41 Fabian Streit  18   29   42   43 Jordi Sunyer  5   6   7   44 Allen J Wilcox  45 Heather J Zar  46 Gerard H Koppelman  24   25 Isabella Annesi-Maesano  47   48 Eva Corpeleijn  21 Harold Snieder  21 Cathrine Hoyo  19   20   49   50 Anke Hüls  51   52   53 Lea Sirignano  18 Stephanie H Witt  18   42   54 Gunda Herberth  17 Michelle Plusquin  16 Dana Dabelea  14 Edwina Yeung  55 Joseph L Wiemels  12 Rebecca C Richmond  56   57 Jack A Taylor  43 Janine F Felix  9   10 Siri E Håberg  8   58 Mariona Bustamante  5   6   7 Stephanie J London  1
Affiliations
Free article

Prenatal Smoking Exposures and Epigenome-wide Methylation in Newborn Blood

Thanh T Hoang et al. Environ Health Perspect. .
Free article

Abstract

Background: Maternal sustained smoking during pregnancy is associated with thousands of differentially methylated CpGs in newborns, but impacts of other prenatal tobacco smoking exposures remain unclear.

Objective: To identify differential DNA methylation in newborns from maternal sustained smoking and less studied prenatal smoking exposures (i.e., maternal exposure to secondhand smoke [SHS] exposure during pregnancy, maternal quitting before pregnancy, paternal smoking around conception, paternal quitting before pregnancy).

Methods: We conducted a large meta-analysis of prenatal tobacco smoking exposures and epigenome-wide newborn blood DNA methylation through the Pregnancy And Childhood Epigenetics Consortium (PACE). Across 19 cohorts, 11,175 parent-newborn pairs contributed information on at least one prenatal smoking exposure, mostly from questionnaires. Maternal blood or urine cotinine measurements, available in a few studies, provided objective data on maternal SHS and smoking during pregnancy. Primary analyses used Illumina450K methylation data; secondary analyses in 5 cohorts examined CpGs unique to the EPIC array.

Results: Maternal sustained smoking associated with differential DNA methylation (false discovery rate [FDR] <0.05) at 8,862 CpGs on the 450K (n=8,148) and did not differ by infant sex. We identified over 300 novel genes not previously identified in EWAS of smoking. No differential methylation was associated with maternal SHS, maternal former smoking, or paternal smoking around conception. However, cg24805739 (MED13L) was associated with paternal former smoking. Forty-one novel genes were identified using maternal cotinine measurements compared to questionnaire. In EPIC unique analyses (n=3,415), differential methylation was observed with maternal sustained smoking (211 CpGs), maternal SHS (5 CpGs), and paternal former smoking (4 CpGs). Smoking-associated CpGs in blood were strongly enriched for functional elements across multiple tissues.

Conclusions: Maternal sustained smoking has the largest impact on newborn DNA methylation, suggesting a strong influence of the intrauterine environment. We observed minimal impacts for less studied exposures including SHS, maternal former smoking and paternal smoking. https://doi.org/10.1289/EHP16303.

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