|Superovulation Affects the Gene Expression Patterns of Mice Oocytes and Preimplantation Embryos Produced by Different Assisted Reproductive Technologies|
|Elhameh Jahanbakhsh-Asl1, Mohammad Salehi2,3, Marefat Ghaffari-Novin1, Yoko Kato4|
|1Department of Biology and Anatomical Science, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
2Urogenital Stem Cell Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
3Department of Biotechnology, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
4Laboratory of Animal Reproductive, College of Agriculture, KINDAI University, Nara, Japan
IJWHR 2018; 6: 444?451
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Keywords : ART, Gonadotrophins, Superovulation, Epigenetics
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Objectives: In this experiment, possible effect of superovulation on important molecular profiles of oocytes and embryos were examined in mice regarding their development.
Materials and Methods: A total of 120 metaphase II oocytes were produced by super or spontaneous ovulation. Blastocyst-stage embryos were produced after in vitro fertilization (IVF) and in vivo fertilization. Blastocysts that have been obtained from naturally mated female without gonadotrophin treatment were also used as controls. Using real-time polymerase chain reaction (PCR), the mRNA expression patterns of Bone morphogenesis protein (Bmp 15(, hepatoma-derived growth factor (Hdgf), DNA methyl transpherase-1 (Dnmt-1), developmental pluripotency associated 3 (Dppa3), and zinc finger protein 57 (Zfp57) genes were compared between superovulated and spontaneously ovulated oocytes; the expression patterns of H19 and small nuclear ribonucleoprotein N) Snrpn( imprinting genes between embryos produced from these oocytes were also compared.
Results: The results of the study showed that expression of five maternal effect genes (Bmp15, Hdgf, Dnmt-1, Dppa3, and Zfp57) in superovulated oocytes were significantly reduced (P<0.05). However, the rates of cleavage to the blastocyst stages were not significantly different (P<0.05) between superovulated and naturally ovulated oocytes in cultured embryos. Moreover, superovulation disturbed the expression patterns of imprinting genes (H19 and Snrpn) in single blastocysts obtained by different assisted reproductive techniques (ARTs).
Conclusions: The findings indicated that superovulation affected the molecular characteristics of ART conceived embryos.
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