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Optimization of parthenogenetic activation of rabbit oocytes and development of rabbit embryo by somatic cell nuclear transfer.
Reproduction in Domestic Animals 2018 September 17
The present study explored a suitable parthenogenetic activation (PA) procedure for rabbit oocytes and investigated the developmental potential of somatic cell nuclear transfer (SCNT) embryos using rabbit fetal fibroblasts (RFFs). The electrical activation had the optimal rate of blastocyst (14.06%) when oocytes were activated by three direct current (DC) pulses (40 V/mm, 20 μs each) followed by 6-dimethylaminopurine (6-DMAP) and cycloheximide (CHX) treatment; the blastocyst rate of ionomycin (ION)+6-DMAP+CHX (12.07%) activation was higher than that of ION+6-DMAP (8.6%) activation, or ION+CHX (1.24%) activation; there was no significant difference in blastocyst rate between ION+6-DMAP+CHX and DC+6-DMAP+CHX groups. The blastocyst rate of ION+6-DMAP+CHX-activated oocytes in the basic rabbit culture medium (M-199) +10% fetal bovine serum (FBS) (14.28%) were higher than that in buffalo conditioned medium (5.75%) or G1/G2 medium (0), and the blastocyst rate was increased when M-199+10% FBS was supplemented with amino acids. Refreshing culture medium every day or every other day significantly increased the blastocyst rate. Treatment of donor cells with 0.5% FBS for 3-5d increased blastocyst rate of SCNT embryos (33.33%) than no serum starvation (22.47%) or 0.5% FBS treatment for 6-9 d (23.61%); the blastocyst rate of SCNT embryos derived from non-transgenic RFFs was higher than that derived from transgenic RFFs by electroporation. The blastocyst development ability of SCNT embryos derived from RFFs by electroporation (32.22%) was higher than that of liposome (19.11%) or calcium phosphate (20.00%) transfection, and only the embryos from electroporation group have the EGFP expression (24.44%). In conclusion, this study for the first time systematically optimized the conditions for yield of rabbit embryo by SCNT. This article is protected by copyright. All rights reserved.
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