• Pattern shows molecular networks governing cardiomyocyte fate across development and stem-cell differentiation, integrating transcription factors (Csx, GATA-4) with proto-oncogenes (c-myc) to regulate cardiac gene programs [2], [17], [7], [6].

• In vitro stem cell models recapitulate cardiac differentiation and chamber-specific gene programs, using ES cells/embryoid bodies to express cardiac myosin heavy chain, ventricular markers, and functional properties [5], [8], [10], [12], [11].

• Extrinsic modulation of cardiac growth by factors and mechanical cues: nonmyocyte-derived growth factors, peptide growth factors, and stretch drive hypertrophic and fetal-contractile gene responses [9], [4], [19].

• In vivo manipulation demonstrates growth and morphogenesis control via oncogenic pathways and gene regulation, showing SV40 T antigen proliferation, c-myc-driven development, and gene-trap–induced heart defects [13], [6], [7], [20].