Melatonin supplementation during in vitro maturation of oocyte enhances subsequent development of bovine cloned embryos

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  • Quanli An
    Department of Basic Veterinary Sciences Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Ministry of Agriculture Yangling Shaanxi China
  • Wei Peng
    Department of Basic Veterinary Sciences Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Ministry of Agriculture Yangling Shaanxi China
  • Yuyao Cheng
    Department of Basic Veterinary Sciences Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Ministry of Agriculture Yangling Shaanxi China
  • Zhenzhen Lu
    Department of Basic Veterinary Sciences Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Ministry of Agriculture Yangling Shaanxi China
  • Chuan Zhou
    Department of Basic Veterinary Sciences Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Ministry of Agriculture Yangling Shaanxi China
  • Yong Zhang
    Department of Basic Veterinary Sciences Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Ministry of Agriculture Yangling Shaanxi China
  • Jianmin Su
    Department of Basic Veterinary Sciences Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Ministry of Agriculture Yangling Shaanxi China

抄録

<jats:title>Abstract</jats:title><jats:p>Oocyte quality, which is directly related to reprogramming competence, is a major important limiting factor in animal cloning efficiency. Compared with oocytes matured in vivo, in vitro matured oocytes exhibit lower oocyte quality and reprogramming competence primarily because of their higher levels of reactive oxygen species. In this study, we investigate whether supplementing the oocyte maturation medium with melatonin, a free radical scavenger, could improve oocyte quality and reprogramming competence. We found that 10<jats:sup>−9</jats:sup> M melatonin effectively alleviated oxidative stress, markedly decreased early apoptosis levels, recovered the integrity of mitochondria, ameliorated the spindle assembly and chromosome alignment in oocytes, and significantly promoted subsequent cloned embryo development in vitro. We also analyzed the effects of melatonin on epigenetic modifications in bovine oocytes. Melatonin increased the global H3K9 acetylation levels, reduced the H3K9 methylation levels, and minimally affected DNA methylation and hydroxymethylation. Genome‐wide expression analysis of genes in melatonin‐treated and nontreated oocytes was also conducted by high‐throughput RNA sequencing. Our results indicated that melatonin ameliorates oocyte oxidative stress and improves subsequent in vitro development of bovine cloned embryos.</jats:p>

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