Non-Coding RNAs from Cardiac Development to Disease: Regulatory Context, Regenerative Potential, and Translational Limits.

Non-coding RNAs (ncRNAs) are often reviewed as lists of molecules associated with individual cardiovascular phenotypes. Here, we instead ask how ncRNAs alter the probability, timing, and stability of cardiovascular cell-state transitions across development, injury, and disease. We organize evidence for microRNAs, long non-coding RNAs, circular RNAs, and extracellular-vesicle-associated RNAs around four regulatory operations: chromatin and transcriptional competence, post-transcriptional tuning, multicellular communication, and persistence or reversibility of the response. Cardiac development provides the reference trajectory from mesoderm specification through progenitor commitment, morphogenesis, and functional maturation. Regeneration is evaluated separately from DNA synthesis or cardioprotection and requires daughter-cardiomyocyte formation, maturation, electrical integration, scar replacement, and durable functional recovery. The disease section uses a bounded cardiovascular scope: atherosclerosis and hypertension are included as determinants of coronary supply and ventricular load, whereas renal and pulmonary examples are restricted to mechanisms that directly affect cardiac afterload or ventricular adaptation. Across these settings, the most recurrent ncRNAs are not universal switches; their effects depend on cell identity, subcellular localization, endogenous abundance, dose, and disease phase. We therefore grade mechanistic claims by target engagement, cell and species specificity, physiological stoichiometry, in vivo rescue, and human validation. This framework converts a molecule-by-molecule catalogue into a critical account of when ncRNAs are causal regulators, context-dependent modifiers, or biomarkers of changing tissue composition.