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Published in: Journal of Assisted Reproduction and Genetics 4/2021

01-04-2021 | Intrauterine Growth Restriction | Reproductive Physiology and Disease

Deregulation of imprinted genes expression and epigenetic regulators in placental tissue from intrauterine growth restriction

Authors: Carla Caniçais, Sara Vasconcelos, Carla Ramalho, C. Joana Marques, Sofia Dória

Published in: Journal of Assisted Reproduction and Genetics | Issue 4/2021

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Abstract

Purpose

Intrauterine growth restriction (IUGR) is a fetal growth complication that can be caused by ineffective nutrient transfer from the mother to the fetus via the placenta. Abnormal placental development and function have been correlated with abnormal expression of imprinted genes, which are regulated by epigenetic modifications at imprinting control regions (ICRs). In this study, we analyzed the expression of imprinted genes known to be involved in fetal growth and epigenetic regulators involved in DNA methylation, as well as DNA methylation at the KvDMR1 imprinting control region and global levels of DNA hydroxymethylation, in IUGR cases.

Methods

Expression levels of imprinted genes and epigenetic regulators were analyzed in term placental samples from 21 IUGR cases and 9 non-IUGR (control) samples, by RT-qPCR. Additionally, KvDMR1 methylation was analyzed by bisulfite sequencing and combined bisulfite restriction analysis (COBRA) techniques. Moreover, global DNA methylation and hydroxymethylation levels were also measured.

Results

We observed increased expression of PHLDA2, CDKN1C, and PEG10 imprinted genes and of DNMT1, DNMT3A, DNMT3B, and TET3 epigenetic regulators in IUGR placentas. No differences in methylation levels at the KvDMR1 were observed between the IUGR and control groups; similarly, no differences in global DNA methylation and hydromethylation were detected.

Conclusion

Our study shows that deregulation of epigenetic mechanisms, namely increased expression of imprinted genes and epigenetic regulators, might be associated with IUGR etiology. Therefore, this study adds knowledge to the molecular mechanisms underlying IUGR, which may contribute to novel prediction tools and future therapeutic options for the management of IUGR pregnancies.
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Metadata
Title
Deregulation of imprinted genes expression and epigenetic regulators in placental tissue from intrauterine growth restriction
Authors
Carla Caniçais
Sara Vasconcelos
Carla Ramalho
C. Joana Marques
Sofia Dória
Publication date
01-04-2021
Publisher
Springer US
Published in
Journal of Assisted Reproduction and Genetics / Issue 4/2021
Print ISSN: 1058-0468
Electronic ISSN: 1573-7330
DOI
https://doi.org/10.1007/s10815-020-02047-3

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