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Although the physiological properties of the myocardium and their dynamic character have been the focus of intense research during the past three decades, the biochemical and molecular correlates underlying cardiac performance for the most part remain poorly understood. The central role of the myocardium in the maintenance of the cardiac output notwithstanding, until very recently the prevailing view of the heart was that ofa biochemically very static organ. Therefore, it did not seem either particularly interesting or suitable to address major questions of cellular and molecular biology affecting normal and pathological states. As a consequence, the impact of the newly developed techniques of recombinant DNA and genetic manipulation in transgenic animals on the understanding of cardiac cellular and molecular biology has been less significant than on other fields of biomedical sciences. With few exceptions, the power of these new techniques and approaches is just beginning to be felt in the field ofcardiovascular biology. This state of affairs is more surprising given the biomedical importance ofthe cardiovascular system in general and the myocardium in particular, as well as the large number of investigators dedicated to its study. This situation is due, at least in part, to the characteristics of the myocardium that, until recently, have made this organ a less than ideal model system for a molecular and genetic approach. Due to the essential role ofthe myocardium in the survival of the organism, most of the genetic mutations that significantly affect its development and/or function are likely to be lethal. This feature explains the very small number of mutations described so far affecting the myocardium either in human or animal models. This is in contrast with the large number of mutations affecting blood cells, the endocrine system, and metabolic pathways, among others. The existence of these mutations has provided the port ofentry for the molecu

Molecular basis of cardiac performance. Plasticity of the myocardium generated through protein isoform switches.