The loss of imprinted DNA methylation in mouse blastocysts is inflicted to a similar extent by in vitro follicle culture and ovulation induction

Molecular Human Reproduction
M D Saenz-de-JuanoEllen Anckaert

Abstract

Does in vitro follicle culture (IFC) have an effect on maintenance of imprinted DNA methylation in preimplantation mouse embryos? We report similar alterations in the methylation pattern of H19 imprinted maternally expressed transcript (H19), small nuclear ribonucleoprotein polypeptide N (Snrpn) and mesoderm specific transcript (Mest) imprinted genes in mouse blastocysts obtained after ovulation induction and IFC. Furthermore, we observed no differences in the gene expression of maternal effect proteins related with imprinting maintenance between superovulated in vivo grown or IFC oocytes. Assisted reproductive technology is associated with adverse post-natal outcomes such as increased risk of premature birth, altered birthweight, congenital anomalies and genomic imprinting syndromes in human and in animal models. Previous studies have shown that ovulation induction allowed normal imprinting establishment in mouse oocytes, but interfered with imprinting maintenance during preimplantation . Normal imprinting establishment was also observed in mouse oocytes derived from a standardized IFC from the early pre-antral follicle stage. The methylation profiles of differentially methylated regions (DMRs) of three key imprinted genes (H1...Continue Reading

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