Abstract
In 1980, Gordon et al. (1) showed that DNA injected into the pronuclei of single-cell embryos could be incorporated, expressed, and transmitted to the offspring of transgenic mice. Since then, pronuclear injection has become a widely used and invaluable tool for the study of mammalian gene function. The same technique has also been used to generate transgenic livestock (2); however, the proportion of injected and transferred embryos giving rise to transgenic animals is greatly reduced relative to mice (1 to 2% vs 10-25%). Two general disadvantages of pronuclear injection apply equally to all species: unpredictable effects of site of incorporation and transgene copy number on gene expression lead to a requirement for testing multiple lines to ensure appropriate transgene expression, and the technique is restricted to the addition of genetic material.
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McWhir, J. (2002). Biomedical and Agricultural Applications of Animal Transgenesis. In: Clarke, A.R. (eds) Transgenesis Techniques. Methods in Molecular Biology, vol 180. Springer, Totowa, NJ. https://doi.org/10.1385/1-59259-178-7:003
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