title: Effects of co-culture of cumulus oocyte complexes with denuded oocytes during in vitro maturation on the developmental competence of cloned bovine embryos.
abstract: This study evaluated the effects of co-culture of immature cumulus oocyte complexes (COCs) with denuded immature oocytes (DO) during in vitro maturation on the developmental competence and quality of cloned bovine embryos. We demonstrated that developmental competence, judged by the blastocyst formation rate, was significantly higher in the co-cultured somatic cell nuclear transfer (SCNT+DO, 37.1 ± 1.1%) group than that in the non-co-cultured somatic cell nuclear transfer (SCNT-DO, 25.1 ± 0.9%) group and was very similar to that in the control IVF (IVF, 38.8 ± 2.8%) group. Moreover, the total cell number per blastocyst in the SCNT+DO group (101.7 ± 6.2) was higher than that in the SCNT-DO group (81.7 ± 4.3), while still less than that in the IVF group (133.3 ± 6.0). Furthermore, our data showed that mRNA levels of the methylation-related genes DNMT1 and DNMT3a in the SCNT+DO group were similar to that in the IVF group, while they were significantly higher in the SCNT-DO group. Similarly, while the mRNA levels of the deacetylation-related genes HDAC2 and HDAC3 were significantly higher in the SCNT-DO group, they were comparable between the IVF and SCNT+DO groups. However, the mRNA levels of HDAC1 and DNMT3B were significantly higher in the SCNT+DO group than in the other groups. In conclusion, the present study demonstrated that co-culture of COCs with DO improves the in vitro developmental competence and quality of cloned embryos, as evidenced by increased total cell number.
authors.affiliation: Department of Animal Science, Division of Applied Life Science (BK21 Plus), Gyeongsang National University, Jinju, Korea.
authors.forename: A-N
authors.initials: AN
authors.lastname: Ha
authors.affiliation: Department of Animal Science, Division of Applied Life Science (BK21 Plus), Gyeongsang National University, Jinju, Korea.
authors.forename: M
authors.initials: M
authors.lastname: Fakruzzaman
authors.affiliation: Department of Animal Science, Division of Applied Life Science (BK21 Plus), Gyeongsang National University, Jinju, Korea.
authors.forename: K-L
authors.initials: KL
authors.lastname: Lee
authors.affiliation: Department of Animal Science, Division of Applied Life Science (BK21 Plus), Gyeongsang National University, Jinju, Korea.
authors.forename: J-I
authors.initials: JI
authors.lastname: Bang
authors.affiliation: Biotechnology Division, Bangladesh Livestock Research Institute, Savar, Dhaka, Bangladesh.
authors.forename: G-K
authors.initials: GK
authors.lastname: Deb
authors.affiliation: Department of Animal, Dairy, and Veterinary Sciences, Utah State University, Logan, UT, USA.
authors.forename: Z
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Animal Science, Division of Applied Life Science (BK21 Plus), Gyeongsang National University, Jinju, Korea.|Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, Korea.
authors.forename: I-K
authors.initials: IK
authors.lastname: Kong
mesh_terms: D000818:Animals; D002417:Cattle / Q000196:embryology*; D019976:Cloning, Organism; D018920:Coculture Techniques / Q000379:methods / Q000662:veterinary; D054885:Cumulus Cells / Q000166:cytology / Q000502:physiology*; D004622:Embryo, Mammalian / Q000166:cytology / Q000502:physiology*; D047108:Embryonic Development / Q000502:physiology; D018507:Gene Expression Regulation, Developmental / Q000502:physiology; D059471:In Vitro Oocyte Maturation Techniques / Q000379:methods / Q000662:veterinary*; D009865:Oocytes / Q000166:cytology / Q000502:physiology*