verbatim): The normal development of the cardiovascular system is regulated by a complex set of molecular pathways that interpret environmental and developmental signals into changes in cardiovascular gene expression. Perturbations of these signaling pathways have been implicated in a number of prevalent human cardiovascular diseases including congenital cardiac malformations, pathologic cardiac hypertrophy, and dilated cardiomyopathy. During the last ten years we have studied the nuclear transcription factors that regulate the development and function of the mammalian cardiovascular system. In an initial series of experiments we identified a cardiac-specific transcriptional promoter/enhancer in the 5' flanking region of the cardiac troponin C (cTnC) gene. We used this promoter to identify a set of nuclear transcription factors that appear to play important roles in regulating early cardiomyocyte development and cardiac morphogenesis. Among these was the GATA4 zinc finger protein that binds to and trans-activates a wide variety of cardiac specific transcriptional regulatory elements. Using a gene targeting approach we showed that GATA4 is necessary for the formation of the primitive ventral heart tube during early murine embryogenesis. More recently, we identified a second zinc finger protein called cardiac friend of GATA (CFOG) that is expressed in the developing heart and that binds specifically to the N-terminal zinc finger of GATA4. Similarly, Olson and coworkers recently demonstrated that GATA4 also interacts with the rel-related protein NFAT3 and that these two proteins appear to be important regulators of cardiac myocyte hypertrophy. The long term goal of the studies described in this continuing RO1 proposal is to understand the molecular mechanisms by which GATA proteins, in conjunction with other transcriptionfactors and coactivator/ repressor proteins regulate cardiogenesis and cardiac hypertrophy. Specifically we will (1) map the regions of GATA4 that are required for its central role in the heart tube formation. (2) genetically and biochemically characterize the interaction between GATA4 and CFOG and understand the effects of this interaction on the transcriptional activity of GATA4, (3) Use gene targeting to determine the roles of NFAT3 and CFOG in cardiac development and function in the mouse. Together, the results of these studies should provide novel basic insights into the molecular pathways that regulate normal cardiac development and function. They should also be relevant to understanding the molecular pathophysiology of a number of clinically important inherited and acquired cardiovascular diseases.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL054592-09
Application #
6526975
Study Section
Cardiovascular and Pulmonary Research A Study Section (CVA)
Program Officer
Pearson, Gail D
Project Start
1995-09-25
Project End
2004-07-31
Budget Start
2002-08-01
Budget End
2003-07-31
Support Year
9
Fiscal Year
2002
Total Cost
$342,018
Indirect Cost
Name
Tufts University
Department
Type
DUNS #
City
Boston
State
MA
Country
United States
Zip Code
02111
Watson, Peter A; Birdsey, Nicholas; Huggins, Gordon S et al. (2010) Cardiac-specific overexpression of dominant-negative CREB leads to increased mortality and mitochondrial dysfunction in female mice. Am J Physiol Heart Circ Physiol 299:H2056-68
Gupta, Amitabh; Hou, Rong; Liu, Liming et al. (2009) Daxx inhibits muscle differentiation by repressing E2A-mediated transcription. J Cell Biochem 107:438-47
Dean, Jarrod; Plante, Jeremy; Huggins, Gordon S et al. (2009) Role of cyclic AMP-dependent kinase response element-binding protein in recombinant adeno-associated virus-mediated transduction of heart muscle cells. Hum Gene Ther 20:1005-12
Aikawa, Ryuichi; Huggins, Gordon S; Snyder, Richard O (2002) Cardiomyocyte-specific gene expression following recombinant adeno-associated viral vector transduction. J Biol Chem 277:18979-85
Huggins, G S; Bacani, C J; Boltax, J et al. (2001) Friend of GATA 2 physically interacts with chicken ovalbumin upstream promoter-TF2 (COUP-TF2) and COUP-TF3 and represses COUP-TF2-dependent activation of the atrial natriuretic factor promoter. J Biol Chem 276:28029-36
Fentzke, R C; Korcarz, C E; Shroff, S G et al. (2001) The left ventricular stress-velocity relation in transgenic mice expressing a dominant negative CREB transgene in the heart. J Am Soc Echocardiogr 14:209-18
Svensson, E C; Huggins, G S; Lin, H et al. (2000) A syndrome of tricuspid atresia in mice with a targeted mutation of the gene encoding Fog-2. Nat Genet 25:353-6
Svensson, E C; Huggins, G S; Dardik, F B et al. (2000) A functionally conserved N-terminal domain of the friend of GATA-2 (FOG-2) protein represses GATA4-dependent transcription. J Biol Chem 275:20762-9
Arteaga, G M; Palmiter, K A; Leiden, J M et al. (2000) Attenuation of length dependence of calcium activation in myofilaments of transgenic mouse hearts expressing slow skeletal troponin I. J Physiol 526 Pt 3:541-9
Svensson, E C; Tufts, R L; Polk, C E et al. (1999) Molecular cloning of FOG-2: a modulator of transcription factor GATA-4 in cardiomyocytes. Proc Natl Acad Sci U S A 96:956-61

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