DNA methylation reprogramming during oogenesis and interference by reproductive technologies: Studies in mouse and bovine models
Ellen Anckaert A and Trudee Fair B C
+ Author Affiliations
- Author Affiliations
A Follicle Biology Laboratory and Center for Reproductive Medicine, UZ Brussel, Vrije Universiteit Brussel, Laarbeeklaan 101, Brussels 1090, Belgium.
B School of Agriculture and Food Sciences, University College Dublin, Belfield, Dublin 4, Ireland.
C Corresponding author. Email: trudee.fair@ucd.ie
Reproduction, Fertility and Development 27(5) 739-754 https://doi.org/10.1071/RD14333
Submitted: 8 September 2014 Accepted: 1 April 2015 Published: 15 May 2015
Abstract
The use of assisted reproductive technology (ART) to overcome fertility problems has continued to increase since the birth of the first baby conceived by ART over 30 years ago. Similarly, embryo transfer is widely used as a mechanism to advance genetic gain in livestock. Despite repeated optimisation of ART treatments, pre- and postnatal outcomes remain compromised. Epigenetic mechanisms play a fundamental role in successful gametogenesis and development. The best studied of these is DNA methylation; the appropriate establishment of DNA methylation patterns in gametes and early embryos is essential for healthy development. Superovulation studies in the mouse indicate that specific ARTs are associated with normal imprinting establishment in oocytes, but abnormal imprinting maintenance in embryos. A similar limited impact of ART on oocytes has been reported in cattle, whereas the majority of embryo-focused studies have used cloned embryos, which do exhibit aberrant DNA methylation. The present review discusses the impact of ART on oocyte and embryo DNA methylation with regard to data available from mouse and bovine models.
Additional keywords: epigenetic, in vitro fertilisation, mammal, oocyte development.
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