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. 1993 Oct;13(10):6044–6051. doi: 10.1128/mcb.13.10.6044

Expression of bovine myf5 induces ectopic skeletal muscle formation in transgenic mice.

R F Santerre 1, K R Bales 1, M J Janney 1, K Hannon 1, L F Fisher 1, C S Bailey 1, J Morris 1, R Ivarie 1, C K Smith 2nd 1
PMCID: PMC364664  PMID: 8413206

Abstract

myf5 is one of a family of four myogenic determination genes that control skeletal muscle differentiation. To study the role of myf5 in vivo, we generated transgenic mice harboring the bovine homolog, bmyf, under control of the murine sarcoma virus promoter. Ectopic expression of the full-length bmyf transgene was detected in brain and heart tissue samples of F1 progeny from transgenic founder mice. Ectopic bmyf expression activated endogenous skeletal myogenic determination genes in the hearts and brains of transgenic animals. Incomplete skeletal myogenesis in most hearts gave rise to cardiomegaly and focal areas of cardiomyopathy. In brains in which ectopic expression led to a more complete myogenesis, focal areas of multinucleated, striated myotubes containing actin, desmin, and myosin were observed. These unexpected results show that myf5 can initiate myogenic differentiation in vivo, supporting the hypothesis that myf5 is responsible for determination of cells to the myogenic lineage in normal embryogenesis.

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Selected References

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