Reproductive and Developmental Biology

The Korean Society of Animal Reproduction (한국동물번식학회)
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Comparisons of Developmental Potential and Gene Expression Level in Porcine Nuclear Transfer, Parthenogenetic and Fertilized Embryos

  • Kim Jung-Gon (Institute of Animal Medicine, College of Veterinary Medicine) ;
  • Kumar B. Mohana (Institute of Animal Medicine, College of Veterinary Medicine) ;
  • Cho Sung-Keun (Division of Applied Life Science, Gyeongsang National University) ;
  • Ock Sun-A (Division of Applied Life Science, Gyeongsang National University) ;
  • Jeon Byeong-Gyun (Division of Applied Life Science, Gyeongsang National University) ;
  • Balasubramanian S. (Department of Clinics, Madras Veterinary College, TamilNadu Veterinary and Animal Sciences University) ;
  • Rho Gyu-Jin (Institute of Animal Medicine, College of Veterinary Medicine) ;
  • Choe Sang-Yong (Institute of Animal Medicine, College of Veterinary Medicine)
  • Published : 2006.06.01
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Abstract

This study was conducted to detect the apoptosis incidence in blastocysts and to compare the abundance of Bax, Bcl2L1, VEGF and FGFR2 in in vitro fertilized (IVF), parthenogenetic (PAT) and nuclear transfer (NT) embryos. Oocytes matured for 40 hr were enucleated and reconstructed with confluenced fetal fibroblasts (FFs) derived from a ${\sim}45$ day fetus. Reconstructed eggs were then fused with 2 DC pulses (2.0 kV/cm, $30{\mu}sec$) and cultured with $7.5{\mu}g/ml$ cytochalasin B for 3 hr. Parthenotes (PAT) were produced with the same electric strength and culture for NT eggs. The embryos were cultured in NCSU-23 medium at $39^{\circ}C,\;5%\;CO_2,\;5%\l;O_2$ in air. In 3 runs, set of 10 embryos at the 4-cell to blastocyst stages were used to extract total RNA for analyzing the gene expression patterns of pro-apoptotic (Bax), anti-apoptotic (Bcl2L1), vasculogenesis (VEGF), implantation (FGFR2III) using real-time quantitative PCR. Cleavage and blastocyst rates were significantly higher (P<0.05) in IVF and PAT ($79.3{\pm}8.5\;and\;25.5{\pm}6.1,\;and\;85.0{\pm}6.4\;and\;38.6{\pm}5.5$, respectively)than NT counterparts ($65.1{\pm}5.2\;and\;15.6{\pm}3.0$, respectively). Significantly higher (P<0.05) total cells were observed in IVF controls and PAT ($34.7{\pm}5.8\;and\;38.1{\pm}4.1$) than NT embryos ($24.8{\pm}3.2$). Apoptosis index was significantly lower (P<0.05) in IVF than NT embryos. The Relative abundances (RA) of Bax and VEGF were significantly higher (P<0.05) at blastocyst stage in NT than IVF control. The RA of Bcl2L1 and FGFR2III were significantly higher (P<0.05) at blastocyst stage in IVF than NT. The present study observed the abnormal gene expressions in NT embryos at various developmental stages, suggesting certain clues to find out the cause of the low efficiency of NT to term.

Keywords

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