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A Study of the Association between Breastfeeding and DNA Methylation in Peripheral Blood Cells of Infants

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Abstract

This article reports on new data on the association of breastfeeding with DNA methylation in the peripheral blood cells of 37 children aged from 9 months to four years. Whole-genome DNA methylation profiling was performed using the Illumina Methylation EPIC array. The Epigenome-Wide Association Study (EWAS) revealed an association between the duration of breastfeeding and the methylation level of 4276 СpG sites related to 2635 genes. According to the functional annotation, these genes were predominantly involved in the control of cell signaling systems, the development of anatomical structures and cells, and, above all, were related to the development and function of the immune system and the CNS. The results of the study allowed assuming a special role of the oxytocin signaling pathway, as a potential trigger of coordinated epigenetic changes in the genes involved in the CNS function in response to breastfeeding.

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Funding

The data collection and DNA-methylation analysis were carried out with the support of the Government of the Russian Federation (grant no. 14.Z50.31.0027; PI E.L. Grigorenko); the EWAS was performed with the support of the Russian Foundation for Basic Research (RFBR grant no. 17-06-00667; PI V.V. Odintsova).

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Correspondence to O. Yu. Naumova.

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Conflict of interests. The authors declare that they have no conflict of interest.

Statement of compliance with standards of research involving humans as subjects. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Informed consent was obtained from parents of all individual participants involved in the study.

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Naumova, O.Y., Odintsova, V.V., Arincina, I.A. et al. A Study of the Association between Breastfeeding and DNA Methylation in Peripheral Blood Cells of Infants. Russ J Genet 55, 749–755 (2019). https://doi.org/10.1134/S1022795419060103

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