Early Pregnancy Exposure to Ambient Air Pollution Among Late-Onset Preeclamptic Cases Is Associated with Placental DNA Hypomethylation of Specific Genes and Slower Placental Maturation

Overview

Journal Toxics

Date 2021 Dec 23

PMID 34941772

Citations 4

Authors

Karin Engstrom

Yumjirmaa Mandakh

Lana Garmire

Zahra Masoumi

Christina Isaxon

Ebba Malmqvist

Lena Erlandsson

Stefan R Hansson

Affiliations

Soon will be listed here.

Abstract

Exposure to ambient air pollution during pregnancy has been associated with an increased risk of preeclampsia (PE). Some suggested mechanisms behind this association are changes in placental DNA methylation and gene expression. The objective of this study was to identify how early pregnancy exposure to ambient nitrogen oxides (NO) among PE cases and normotensive controls influence DNA methylation (EPIC array) and gene expression (RNA-seq). The study included placentas from 111 women (29 PE cases/82 controls) in Scania, Sweden. First-trimester NO exposure was assessed at the participants' residence using a dispersion model and categorized via median split into high or low NO. Placental gestational epigenetic age was derived from the DNA methylation data. We identified six differentially methylated positions (DMPs, < 0.05) comparing controls with low NO vs. cases with high NO and 14 DMPs comparing cases and controls with high NO. Placentas with female fetuses showed more DMPs (N = 309) than male-derived placentas (N = 1). Placentas from PE cases with high NO demonstrated gestational age deceleration compared to controls with low NO ( = 0.034). No differentially expressed genes (DEGs, < 0.05) were found. In conclusion, early pregnancy exposure to NO affected placental DNA methylation in PE, resulting in placental immaturity and showing sexual dimorphism.

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