Abstract
Somatic cell clone technology is a viable approach to preserving endangered livestock and wildlife genetic resources. In the present research, somatic cell nuclear transfer (SCNT) was performed using granulose cells from the critical endangered Chinese red-cross yellow cattle as donor cells. A total of 211 oocytes were manipulated and 166 (79%) of them were successfully enucleated. 112 (67.4%) SCNT embryos were reconstructed, 94 (83%) of them cleaved, and 48 (43%) of them developed to blastocyst stage. SCNT blastocysts were transferred to 6 Holstein recipients, and 2 (33%) of them were found to be pregnant. One of them maintained to term and delivered a calf, whereas another aborted. Effect of different fusion buffer (mannitol vs. Zimmerman fusion buffer) and different activation methods (calcium ionophore+6-DMAP vs. cycloheximide+CB) on fusion rate and development of SCNT embryos were investigated. The results indicated that: (i) on condition of two DC pulses of 2.5 kV/cm for 10 μs each, fusion rates were higher in mannitol solution than in Zimmerman fusion buffer (71% vs. 61%, respectively, p<0.05=, but the blastocysts rates did not differ between two treatments (36% vs. 39%, p>0.05); (ii) There was no significant difference in development rates to the blastocyst stage for SCNT embryos activated by calcium ionophore+6-DMAP or by cycloheximide+CB (42% vs. 46%, respectively, p>0.05). Microsatellite DNA analysis examining 28 loci confirmed that the cloned calf was genetically identical to the donor Jinan red-cross yellow cattle and different from the recipient females. Growth and reproductive performance of cloned cow were evaluated, and there were no differencei cross-red n it between cloned and normal control Jinan yellow cattle. Furthermore, the cloned yellow cow has delivered a healthy yellow calf.
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Dai, Y., Lian, Z., Zhu, H. et al. Clone of Chinese Jinan redcross yellow cattle and evaluation of reproductive characteristics of cloned calf. Chin. Sci. Bull. 50, 2592–2597 (2005). https://doi.org/10.1007/BF03183656
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DOI: https://doi.org/10.1007/BF03183656