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Effects of Co‐culture of Cumulus Oocyte Complexes with Denuded Oocytes During In Vitro Maturation on the Developmental Competence of Cloned Bovine Embryos
Author(s) -
Ha AN,
Fakruzzaman M,
Lee KL,
Bang JI,
Deb GK,
Wang Z,
Kong IK
Publication year - 2015
Publication title -
reproduction in domestic animals
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.546
H-Index - 66
eISSN - 1439-0531
pISSN - 0936-6768
DOI - 10.1111/rda.12487
Subject(s) - somatic cell nuclear transfer , blastocyst , andrology , biology , oocyte , embryo , in vitro maturation , embryogenesis , genetics , medicine
Contents This study evaluated the effects of co‐culture of immature cumulus oocyte complexes ( COC s) 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 DNMT 1 and DNMT 3a 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 HDAC 2 and HDAC 3 were significantly higher in the SCNT ‐ DO group, they were comparable between the IVF and SCNT + DO groups. However, the mRNA levels of HDAC 1 and DNMT 3 B were significantly higher in the SCNT + DO group than in the other groups. In conclusion, the present study demonstrated that co‐culture of COC s with DO improves the in vitro developmental competence and quality of cloned embryos, as evidenced by increased total cell number.