Cited by 188Epigenetics and DNA MethylationAir Quality and Health ImpactsHealth, Environment, Cognitive Aging

Placental mitochondrial methylation and exposure to airborne particulate matter in the early life environment: An ENVIR ON AGE birth cohort study

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Janssen, Bram G, Byun, Hyang-Min, Gyselaers, Wilfried, Lefebvre, Wouter, Baccarelli, Andrea A, Nawrot, Tim S·2015·Epigenetics

Abstract

Most research to date has focused on epigenetic modifications in the nuclear genome, with little attention devoted to mitochondrial DNA (mtDNA). Placental mtDNA content has been shown to respond to environmental exposures that induce oxidative stress, including airborne particulate matter (PM). Damaged or non-functioning mitochondria are specifically degraded through mitophagy, exemplified by lower mtDNA content, and could be primed by epigenetic modifications in the mtDNA. We studied placental mtDNA methylation in the context of the early life exposome. We investigated placental tissue from 381 mother-newborn pairs that were enrolled in the ENVIRONAGE birth cohort. We determined mtDNA methylation by bisulfite-pyrosequencing in 2 regions, i.e., the D-loop control region and 12S rRNA (MT-RNR1), and measured mtDNA content by qPCR. PM2.5 exposure was calculated for each participant's home address using a dispersion model. An interquartile range (IQR) increment in PM2.5 exposure over the entire pregnancy was positively associated with mtDNA methylation (MT-RNR1: +0.91%, P = 0.01 and D-loop: +0.21%, P = 0.05) and inversely associated with mtDNA content (relative change of -15.60%, P = 0.001) in placental tissue. mtDNA methylation was estimated to mediate 54% [P = 0.01 (MT-RNR1)] and 27% [P = 0.06 (D-loop)] of the inverse association between PM2.5 exposure and mtDNA content. This study provides new insight into the mechanisms of altered mitochondrial function in the early life environment. Epigenetic modifications in the mitochondrial genome, especially in the MT-RNR1 region, substantially mediate the association between PM2.5 exposure during gestation and placental mtDNA content, which could reflect signs of mitophagy and mitochondrial death.

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Authors
Janssen, B. G., Byun, H.-M., Gyselaers, W., Lefebvre, W., Baccarelli, A. A., & Nawrot, T. S.
Affiliations
  • Hasselt University (BE)
  • Harvard University (US)
  • Ziekenhuis Oost-Limburg (BE)
  • Flemish Institute for Technological Research (BE)
Corresponding author
Nawrot, Tim S
Venue
Epigenetics
Published
2015-05-21
Volume
10
Issue
6
Pages
536-544
ISSN
  • 1559-2294 (ISSN-L)
  • 1559-2308
OpenAlex
W1828742533
Cited by
187
References
45
Citations by year
2026: 7 · 2025: 11 · 2024: 17 · 2023: 13 · 2022: 23 · 2021: 18 · 2020: 18 · 2019: 15 · 2018: 23 · 2017: 25 · 2016: 15 · 2015: 2
FWCI
9.40
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Epigenetics (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
  • Document Server@UHasselt (UHasselt) (submittedVersion, cc-by-nc)
  • Lirias (submittedVersion)
Funders
National Institute of Environmental Health Sciences (R21ES022694, R01ES021733, R01ES021357)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Air Quality and Health Impacts
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Health, Environment, Cognitive Aging
Keywords
PM2.5 exposure, airborne particulate matter, mtDNA content, mitophagy, MT-RNR1, D-loop, oxidative stress, ENVIRONAGE birth cohort, mediation analysis
MeSH terms
Environmental Exposure, Female, Humans, Infant, Newborn, Male, Mitochondria, Placenta, Pregnancy, RNA, Ribosomal, Oxidative Stress, DNA Methylation, Epigenesis, Genetic, Particulate Matter, Genome, Mitochondrial

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