© 1996 American Heart Association, Inc.
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Factors Involved in Cardiogenesis and the Regulation of Cardiac-Specific Gene Expression
the Laboratory for Molecular Cardiology, The Centre for Cardiovascular Research, The Toronto Hospital, and the Departments of Clinical Biochemistry and Medicine, University of Toronto (Canada).
Correspondence to Dr C.-C. Liew, The Cardiac Gene Unit, 100 College St, Banting Institute, Rm 418, University of Toronto, Toronto, Ontario, Canada M5G 1L5. E-mail liewcc@gpu.utcc.utoronto.ca.
The delineation of the mechanisms that regulate cardiac gene expression is central to our understanding of cardiac growth and development. Much progress has been made toward the identification of factors involved in tissue-restricted gene expression, especially in skeletal muscle cells. However, the mechanisms regulating the expression of cardiac-specific genes remain less well understood. Certain homeodomain proteins have been implicated in commitment to the cardiac phenotype. Among the best characterized are the murine proteins Csx, Nkx-2.5, and Nkx-2.6, related to the protein tinman, which is essential for heart formation in Drosophila. The expression of these genes precedes that of cardiac-specific genes and is therefore believed to play a critical role in the development of the heart. The GATA proteins are a family of zinc finger proteins that are also expressed early in cardiac development and may act separately from, or in concert with, the homeodomain proteins as crucial regulators of heart development. The myosin heavy and light chain genes, the actin genes, the troponin genes, and the atrial natriuretic factor and muscle creatine kinase genes have served as excellent paradigms for the study of cardiac gene expression. Although differences in cis-acting elements and their behavior in binding assays have been observed between different genes, there exist similarities that are noteworthy. In this review, we will discuss the factors involved in the regulation of cardiac-specific gene expression in an attempt to provide a better understanding of the process of cardiogenesis.
Key Words: cardiogenesis • cardiac-specific gene regulation
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