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1 Department of Animal Science
2 Department of Population Health and Reproduction,School of Veterinary Medicine, University of California, Davis 95616
Transgenic mice were used as model systems to evaluate the impact of human lysozyme expression in the mammary gland. We previously generated two lines of transgenic mice that express human lysozyme mRNA in the mammary gland under the tissue-specific and developmentally correct control of the bovine gene promoter for 
s1-casein. Concentrations of human lysozyme protein in milk of transgenic mice varied from .25 to .71 µg/µl of milk. Human lysozyme secreted into mouse milk retained its antimicrobial activity, as determined by a denaturing polyacrylamide gel activity assay. The physical and functional properties of the milk were also altered, because mouse milk containing human lysozyme had a 35% decrease in rennet clotting time, a smaller median micelle size (157 nm vs. 172 nm), and a 2.5– to 3-fold greater gel strength than control milk. From these results, we conclude that the use of transgenic animals producing lysozyme in the milk is feasible and potentially useful to the dairy industry.
Key Words: transgenic • human lysozyme • milk
Submitted on November 21, 1994
Accepted on July 18, 1995
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