In vitro reduction of bovine oocyte ATP production with oligomycin affects embryo epigenome.

IF 3.7 3区生物学 Q1 DEVELOPMENTAL BIOLOGY Reproduction Pub Date : 2024-01-16 Print Date: 2024-02-01 DOI:10.1530/REP-23-0271

Ben Meulders, Jo L M R Leroy, Inne Xhonneux, Peter E J Bols, Waleed F A Marei

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Abstract

In brief: Epigenetic programming is a crucial process during early embryo development that can have a significant impact on the results of assisted reproductive technology (ART) and offspring health. Here we show evidence using a bovine in vitro experiment that embryo epigenetic programing is dependent on oocyte mitochondrial bioenergetic activity during maturation.

Abstract: This study investigated if oocyte and early embryo epigenetic programming are dependent on oocyte mitochondrial ATP production. A bovine in vitro experiment was performed in which oocyte mitochondrial ATP production was reduced using 5 nmol/L oligomycin A (OM; ATP synthase inhibitor) during in vitro maturation (IVM) compared to control (CONT). OM exposure significantly reduced mitochondrial ATP production rate in MII oocytes (34.6% reduction, P = 0.018) and significantly decreased embryo cleavage rate at 48 h post insemination (7.6% reduction, P = 0.031). Compared to CONT, global DNA methylation (5mC) levels were decreased in OM-exposed MII oocytes (9.8% reduction, P = 0.019) while global histone methylation (H3K9me2) was increased (9.4% increase, P = 0.024). In zygotes, OM exposure during IVM increased 5mC (22.3% increase, P < 0.001) and histone acetylation (H3K9ac, 17.3% increase, P = 0.023) levels, while H3K9me2 levels were not affected. In morulae, 5mC levels were increased (10.3% increase, P = 0.041) after OM exposure compared to CONT, while there was no significant difference in H3K9ac and H3K9me2 levels. These epigenetic alterations were not associated with any persistent effects on embryo mitochondrial ATP production rate or mitochondrial membrane potential (assessed at the four-cell stage). Also, epigenetic regulatory genes were not differentially expressed in OM-exposed zygotes or morulae. Finally, apoptotic cell index in blastocysts was increased after OM exposure during oocyte maturation (41.1% increase, P < 0.001). We conclude that oocyte and early embryo epigenetic programming are dependent on mitochondrial ATP production during IVM.

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寡霉素对体外减少牛卵母细胞ATP生成的影响。

本研究探讨了卵母细胞和早期胚胎的表观遗传编程是否依赖于卵母细胞线粒体ATP的产生。用5nmol/l寡霉素A (OM)降低牛卵母细胞线粒体ATP产量;ATP合酶抑制剂)在体外成熟(IVM)期间与对照组(CONT)相比。om暴露显著降低了MII卵母细胞线粒体ATP的产生率(降低34.6%，P=0.018)，并显著降低了48h时的胚胎裂解率(降低7.6%，P=0.031)。与对照组相比，暴露于om的MII卵母细胞整体DNA甲基化(5mC)水平降低(降低9.8%，P=0.019)，而整体组蛋白甲基化(H3K9me2)水平升高(增加9.4%，P=0.024)。在受精卵中，IVM期间om暴露增加了5mC(增加22.3%)

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来源期刊

Reproduction 生物-发育生物学

CiteScore

7.40

自引率

2.60%

发文量

199

审稿时长

4-8 weeks

期刊介绍： Reproduction is the official journal of the Society of Reproduction and Fertility (SRF). It was formed in 2001 when the Society merged its two journals, the Journal of Reproduction and Fertility and Reviews of Reproduction. Reproduction publishes original research articles and topical reviews on the subject of reproductive and developmental biology, and reproductive medicine. The journal will consider publication of high-quality meta-analyses; these should be submitted to the research papers category. The journal considers studies in humans and all animal species, and will publish clinical studies if they advance our understanding of the underlying causes and/or mechanisms of disease. Scientific excellence and broad interest to our readership are the most important criteria during the peer review process. The journal publishes articles that make a clear advance in the field, whether of mechanistic, descriptive or technical focus. Articles that substantiate new or controversial reports are welcomed if they are noteworthy and advance the field. Topics include, but are not limited to, reproductive immunology, reproductive toxicology, stem cells, environmental effects on reproductive potential and health (eg obesity), extracellular vesicles, fertility preservation and epigenetic effects on reproductive and developmental processes.