Materials and methods related to a transgenic non-human animal (e.g., a transgenic non-human mammal) whose genome comprises a disrupted TIEG allele are provided. Methods for making such transgenic non-human animals, and using them to identify and characterize agents that affect conditions related to TIEG activity, such as cardiac hypertrophy and bone formation also are provided. In addition, materials and methods related to the treatment of hypertrophic cardiomyopathy are provided.