Abstract
Using a replication-deficient retroviral vector based on the avian leukosis virus (ALV), we inserted into the chicken genome a transgene encoding a secreted protein, β-lactamase, under the control of the ubiquitous cytomegalovirus (CMV) promoter. Biologically active β-lactamase was secreted into the serum and egg white of four generations of transgenic chickens. The expression levels were similar in successive generations, and expression levels in the magnum of the oviduct were constant over at least 16 months in transgenic hens, indicating that the transgene was stable and not subject to silencing. These results support the potential of the hen as a bioreactor for the production of commercially valuable, biologically active proteins in egg white.
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Acknowledgements
We thank Robert Harvey for the β-lactamase plasmid and Henry Marks and the University of Georgia Poultry Science Department for access to poultry facilities. We thank Wei Hu, Lyn Olliff, Michael Morgan, Jeff Rapp, Sara Mathews, Heath Sellers, and Tom Beacorn for technical assistance. This work was supported in part by research grants to R.I. from the Georgia Research Alliance, the Applied Technology Development Corp., and AviGenics, Inc.
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Harvey, A., Speksnijder, G., Baugh, L. et al. Expression of exogenous protein in the egg white of transgenic chickens. Nat Biotechnol 20, 396–399 (2002). https://doi.org/10.1038/nbt0402-396
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DOI: https://doi.org/10.1038/nbt0402-396
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