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1 March 2003 Development of Parthenogenetic Rat Embryos
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Abstract

In an effort to establish cloning technology for the rat, we tested several methods (electric stimulation, treatment with ethanol or strontium) for the parthenogenetic activation of rat oocytes. We observed marked individual differences among rats of the outbred Wistar strain in their ability to yield activatable oocytes. These differences were independent of the activation protocol and may be due to a genetic predisposition that is crucial for the parthenogenetic activation of oocytes. The activation of oocytes was dependent upon the time between superovulation of the donor animal and the collection of the embryos. Aged oocytes (derived about 24 h after superovulation) were more prone to activation by each method than were younger oocytes, and some even underwent spontaneous activation without treatment and exhibited pronuclear formation and blastocyst development. All activation methods were effective in generating parthenogenetic rat embryos, and rat parthenotes developed until implantation. However, in general, short-term (15 min) and long-term (2 h) strontium treatment was superior to stimulation by ethanol or electric pulse for parthenogenetic activation. These results will be helpful in achieving successful cloning in the rat.

Alexander Krivokharchenko, Elena Popova, Ioulia Zaitseva, Larissa Vil'ianovich, Detlev Ganten, and Michael Bader "Development of Parthenogenetic Rat Embryos," Biology of Reproduction 68(3), 829-836, (1 March 2003). https://doi.org/10.1095/biolreprod.102.006494
Received: 16 April 2002; Accepted: 1 September 2002; Published: 1 March 2003
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