Myocytes, CardiacMyocardiumHeartCardiomegalyGATA4 Transcription FactorHeart VentriclesCells, CulturedMyocardial ContractionAtrial Natriuretic FactorAnimals, NewbornCardiac OutputMyosin Heavy ChainsGene Expression RegulationArrhythmias, CardiacCardiac ElectrophysiologyRats, Sprague-DawleyVentricular MyosinsHeart FailureGene ExpressionCardiomyopathiesSarcomeresVentricular RemodelingSignal TransductionCardiac Surgical ProceduresMice, TransgenicRNA, MessengerSarcoplasmic Reticulum Calcium-Transporting ATPasesRats, WistarTranscription FactorsGene Transfer TechniquesDeath, Sudden, CardiacGene Expression Regulation, DevelopmentalMutationMice, Inbred C57BLCell DifferentiationPhenotypeTime FactorsDisease Models, AnimalMuscle ProteinsGenetic VectorsMolecular Sequence DataMice, KnockoutEpimediumHeart DiseasesMyocardial InfarctionCalciumEmbryonic Stem CellsMyoblasts, CardiacCardiac MyosinsGene Expression ProfilingT-Box Domain ProteinsReverse Transcriptase Polymerase Chain ReactionEchocardiographyCardiotonic AgentsHomeodomain ProteinsAdenoviridaeMitochondria, HeartHemodynamicsBase SequenceSerum Response FactorCardiac Pacing, ArtificialGenetic TherapyCalcineurinHypertrophy, Left VentricularNuclear ProteinsPromoter Regions, GeneticTranscription, GeneticDependovirusMyocardial Reperfusion InjuryCardiac TamponadeBlotting, WesternMEF2 Transcription FactorsIsoproterenolMyocardial IschemiaDNA-Binding ProteinsStem CellsMyogenic Regulatory FactorsCardiac CatheterizationCell LineCardiomyopathy, DilatedTransgenesApoptosisTransfectionTroponin ICalcium Channels, L-TypeEmbryo, MammalianGenes, ReporterActinsMutation, MissenseCell SizeHeart ArrestMuscle CellsSarcolemmaOligonucleotide Array Sequence AnalysisRepressor ProteinsPedigreeVentricular Function, LeftHeart AtriaMyosinsElectrocardiography