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Cloned goats (Capra hircus) from adult ear cells

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Abstract

The average number of available oocytes recovered per ovary collected during the breeding season in dairy goats was 5.5 (1815/330). 66.17% (1201/1815) of oocytes extruded the first polar body after maturation in vitro for 20 h. 75.44% (906/1201) of matured oocytes with membrane evagination around the M II chromosomes were enucleated. Ear skin fibroblast cells were derived from an adult female Jining Grey goat (C. hircus). The cells were cryopreserved in liquid nitrogen after passage 2. Thawed cells were further cultured for 3–6 passages and were subjected to serum starvation by 0.5% FBS for 2–10 d, then used as donor cells for nuclear transfer. 98.12% (889/906) of the enucleated oocytes were reconstructed by intracytoplasmic injection of karyoplast. The reconstructed embryos were activated by 5 μmol/L ionomycin for 4.5 min and further activated by culturing with 6-dimethylaminopurine (6-DMAP) for 3 h. After 36 h of culture in mCR1aaBF, 76.69% (645/841) of the cloned embryos cleaved. There were no significant differences in development in vitro between the cloned embryos derived from donor cells precooled at 4°C for 24 h and nonprecooled donor cells. The cleavage rates, 4-cell development, and blastocyst development of reconstructed embryos were 72.48% (79/109), 53.16% (42/79), and 19.05% (8/42) in precooled group; 68.5% (211/308), 59.72% (126/211), and 17.46% (22/126) in nonprecooled group, respectively. Eighteen cloned 4-cell embryos derived from precooled donor cells were transferred and one cloned kid was born. Eighty-four cloned 4-cell embryos derived from nonprecooled donor cells were transferred and no offspring were produced. Of 18 cloned morale from nonprecooled donor cells transferred, one kid was born. The results of microsatellite DNA analyses indicated that the two cloned kids were from the same donor fibroblast cell line derived from an adult goat ear skin.

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Author notes

  1. Guo Jitong

    Present address: Monash Institute of Reproduction and Development, Monash University, 27-31 Wright Street, VIC 3168, Clayton, Australia

Authors and Affiliations

  1. College of Life Science, Inner Mongolia University, 010021, Huhhot, China

    Guo Jitong & Li Yu

  2. Institute of Bioengineering, Northwest Sci-tech University of Agriculture and Forestry, 712100, Yangling, China

    An Zhixing, Li Xuefeng, Li Yuqiang, Guo Zekun & Zhang Yong

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  1. Guo Jitong
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  2. An Zhixing
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Correspondence to Guo Jitong.

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Jitong, G., Zhixing, A., Yu, L. et al. Cloned goats (Capra hircus) from adult ear cells. Sci. China Ser. C.-Life Sci. 45, 260–267 (2002). https://doi.org/10.1360/02yc9029

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  • DOI: https://doi.org/10.1360/02yc9029

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