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Title: | Placental circadian pathway methylation and in utero exposure to fine particle air pollution | Authors: | NAWROT, Tim SAENEN, Nelly SCHENK, Julie JANSSEN, Bram Motta, Valeria Tarantini, Letizia COX, Bianca Lefebvre, Wouter Vanpoucke, Charlotte Maggioni, Cristina Bollati, Valentina |
Issue Date: | 2018 | Source: | ENVIRONMENT INTERNATIONAL, 114, p. 231-241 | Abstract: | In mammals, a central clock maintains the daily rhythm in accordance with the external environment. At the molecular level, the circadian rhythm is maintained by epigenetic regulation of the Circadian pathway. Here, we tested the role of particulate matter with an aerodynamic diameter <= 2.5 mu m (PM2.5) exposure during gestational life on human placental Circadian pathway methylation, as an important molecular target for healthy development. In 407 newborns, we quantified placental methylation of CpG sites within the promoter regions of the following genes: CLOCK, BMAL1, NPAS2, CRY1-2 and PER1-3 using bisulfite-PCR-pyrosequencing. Daily PM2.5 exposure levels were estimated for each mother's residence, using a spatiotemporal interpolation model. We applied mixed-effects models to study the methylation status of the Circadian pathway genes and in utero PM2.5 exposure, while adjusting for a priori chosen covariates. In a multi-gene model, placental Circadian pathway methylation was positively and significantly (p < 0.0001) associated with 3rd trimester PM2.5 exposure. Consequently, the single-gene models showed relative methylation differences [Log(fold change)] in placental NPAS2 (+0.16; p = 0.001), CRY1 (+0.59; p = 0.0023), PER2 (+0.36; p = 0.0005), and PER3 (+0.42; p = 0.0008) for an IQR increase (8.9 mu g/m(3)) in 3rd trimester PM2.5 exposure. PM2.5 air pollution, an environmental risk factor leading to a pro-inflammatory state of the mother and foetus, is associated with the methylation pattern of genes in the Circadian pathway. The observed alterations in the placental CLOCK epigenetic signature might form a relevant molecular mechanism through which fine particle air pollution exposure might affect placental processes and foetal development. | Notes: | Nawrot, TS (reprint author), Ctr Environm Sci, Agoralaan Bldg D, B-3590 Diepenbeek, Belgium, tim.nawrot@uhasselt.be | Keywords: | circadian rhythm; placenta; DNA methylation; air pollution; prenatal; CLOCK | Document URI: | http://hdl.handle.net/1942/26581 | ISSN: | 0160-4120 | e-ISSN: | 1873-6750 | DOI: | 10.1016/j.envint.2018.02.034 | ISI #: | 000429877200026 | Rights: | © 2018 Published by Elsevier Ltd. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2019 |
Appears in Collections: | Research publications |
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