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Review

Electrophysiological phenotyping in genetically engineered mice¹

Department of Cardiology, Children’s Hospital-Boston, Harvard Medical School, Boston, Massachusetts 02115

Advances in transgene and gene targeting technology have enabled sophisticated manipulation of the mouse genome, providing important insights into the molecular mechanisms underlying cardiac conduction, arrhythmogenesis, and sudden cardiac death. The mouse is currently the principal mammalian model for studying biological processes, particularly related to cardiac pathophysiology. Murine models have been engineered harboring gene mutations leading to inherited structural and electrical disorders of the heart due to transcription factor mutations, connexin protein defects, and G protein and ion channelopathies. These mutations lead to phenotypes reminiscent of human clinical disease states including congenital heart defects, cardiomyopathies, and long-QT syndrome, creating models of human electrophysiological disease. Functional analyses of the underlying molecular mechanisms of resultant phenotypes require appropriate and sophisticated experimental methodology. This paper reviews current in vivo murine electrophysiology study techniques and genetic mouse models pertinent to human arrhythmia disorders.

electrophysiology; molecular biology; arrhythmias; animal model

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