Keywords :
Animals; Body Weights and Measures; Breeding/methods; DNA-Binding Proteins/genetics; Gene Targeting/methods; Genetic Engineering/methods; Genetic Vectors/genetics; Male; Mice; Mice, Transgenic; Muscle Development/genetics; Muscle, Skeletal/growth & development; Myosin Light Chains/genetics; Myostatin; Nuclear Proteins/genetics; Promoter Regions, Genetic/genetics; Sex-Determining Region Y Protein; Totipotent Stem Cells/metabolism; Transcription Factors/genetics; Transforming Growth Factor beta/genetics/metabolism; Y Chromosome/genetics
Abstract :
[en] Using a two-step procedure involving insertional gene targeting and recombinase-mediated cassette exchange in ES cells, we have produced two lines of transgenic mice expressing a dominant-negative latency-associated myostatin propeptide under control of the myosin light chain 1F promoter and 1/3 enhancer from the TSPY locus on the Y chromosome. Males of the corresponding lines are characterized by a 5-20% increase in skeletal muscle mass. This experiment demonstrates the feasibility of a more efficient cattle production system combining superior beef production abilities for bulls and dairy abilities for cows.
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