Myocytes, CardiacMyocardiumCells, CulturedTranscription FactorsMutationHeartGene Expression RegulationSignal TransductionAnimals, NewbornMolecular Sequence DataCardiomegalyBase SequenceMyocardial ContractionDNA-Binding ProteinsRNA, MessengerPromoter Regions, GeneticPhenotypeCell DifferentiationTranscription, GeneticReverse Transcriptase Polymerase Chain ReactionMice, KnockoutGene Expression Regulation, DevelopmentalRats, Sprague-DawleyCell LineApoptosisMice, TransgenicRepressor ProteinsHeart VentriclesGene Expression ProfilingMice, Inbred C57BLRats, WistarHomeodomain ProteinsAmino Acid SequenceProtein BindingNuclear ProteinsCalciumTranscriptional ActivationEmbryonic Stem CellsGene ExpressionTransfectionBlotting, WesternChromatin ImmunoprecipitationGene TargetingTrans-ActivatorsMicroRNAsOligonucleotide Array Sequence AnalysisMitochondria, HeartMutation, MissenseRNA InterferenceGATA4 Transcription FactorPedigreePhosphorylationMyocardial Reperfusion InjuryCardiotonic AgentsDisease Models, AnimalDNA PrimersDrosophila ProteinsCell SizeSarcomeresCell ProliferationTime FactorsCell Line, TumorGenes, ReporterBinding SitesCell SurvivalMuscle ProteinsCalcium Channels, L-TypeGene DeletionImmunohistochemistryRNA, Small InterferingDown-RegulationIsoproterenolHypertrophyCell HypoxiaUp-RegulationMembrane ProteinsMuscle CellsModels, BiologicalBasic Helix-Loop-Helix Transcription FactorsExonsStem CellsConnexin 43Cell NucleusCarrier ProteinsCalcium SignalingHeterozygoteDNA Mutational AnalysisFibroblastsProtein Structure, TertiaryEmbryo, MammalianHomozygoteProtein IsoformsSarcoplasmic Reticulum Calcium-Transporting ATPasesbeta CateninDrosophilaSarcolemmaCardiomyopathiesCardiac MyosinsPolymerase Chain ReactionProtein Transport