Myocytes, CardiacMyocardiumCells, CulturedAnimals, NewbornHeartMutationGene Expression ProfilingGene Expression RegulationCardiomegalyCell DifferentiationMyocardial ContractionMolecular Sequence DataRNA, MessengerRats, Sprague-DawleyGene ExpressionPhenotypeGenetic VectorsSignal TransductionBase SequenceMice, KnockoutHeart VentriclesMice, TransgenicReverse Transcriptase Polymerase Chain ReactionEmbryonic Stem CellsGenetic TherapyMice, Inbred C57BLOligonucleotide Array Sequence AnalysisCell LineTranscription FactorsStem CellsRats, WistarCalciumApoptosisMitochondria, HeartAmino Acid SequenceGene Expression Regulation, DevelopmentalDisease Models, AnimalMutation, MissenseTransduction, GeneticGene Transfer TechniquesLentivirusPedigreeMyocardial Reperfusion InjuryCardiotonic AgentsTime FactorsTransfectionSarcomeresHematopoietic Stem CellsCell SizeGATA4 Transcription FactorBlotting, WesternTranscription, GeneticX-Linked Combined Immunodeficiency DiseasesCumulus CellsCalcium Channels, L-TypeGreen Fluorescent ProteinsIsoproterenolImmunohistochemistryDNA-Binding ProteinsPolymerase Chain ReactionCell SurvivalHomeodomain ProteinsCell LineageCell ProliferationGrowth Differentiation Factor 3Promoter Regions, GeneticHypertrophyRetroviridaeMembrane ProteinsConnexin 43Muscle CellsFibroblastsMuscle ProteinsEmbryo, MammalianCalcium SignalingDNA PrimersSarcoplasmic Reticulum Calcium-Transporting ATPasesSarcolemmaCardiac MyosinsUp-RegulationSodium-Calcium ExchangerTransgenesCardiomyopathiesHeterozygoteMyocardial IschemiaCell Culture TechniquesMyoblasts, CardiacExonsNuclear ProteinsPhosphorylationVentricular MyosinsVentricular RemodelingHomozygoteAdrenergic beta-Agonists