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Circulation Research. 1989;65:1241-1246

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Circulation Research, Vol 65, 1241-1246, Copyright © 1989 by American Heart Association

ARTICLES

Molecular cloning and expression of chicken cardiac troponin C

N Toyota, Y Shimada and D Bader
Department of Cell Biology and Anatomy, Cornell University Medical College, New York.

We have isolated a full length complementary DNA clone (pCTnC1) from a 19-day embryonic chicken heart library corresponding to cardiac troponin C (TnC). Sequence analysis demonstrated varying homologies with TnC complementary DNA clones isolated from developing chick skeletal muscle. Using pCTnC1 as a hybridization probe, we have determined that cardiac TnC is constitutively expressed in both atria and ventricles of the developing and adult heart. These data along with previous immunochemical studies of TnC expression demonstrate that the slow skeletal and cardiac muscle isoform is the only TnC expressed in the heart. In contrast, expression of slow skeletal and cardiac muscle TnC is developmentally regulated in skeletal muscles of the chicken. The tightly controlled expression of slow skeletal and cardiac muscle TnC in the varying myocyte types of the heart suggests a physiologically significant role of this regulatory protein.


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