Dynamics of human cardiogenesis and its disruption in trisomy 21.
A spatially resolved single-cell multiomics map of the developing human heart defines 21 tissue niches, resolves three pacemaker cell subtypes in the sinoatrial node, and traces maturation trajectories of atrial and ventricular cardiomyocytes. Trisomy 21 hearts show depletion of compact cardiomyocytes and increased apoptosis relative to euploid hearts, a finding validated in isogenic-matched induced pluripotent stem cell-derived cardiomyocytes, providing a mechanistic lead on congenital heart disease risk in Down's syndrome.
Why it matters: It links a cellular deficit in trisomy 21 hearts to congenital heart disease risk using a spatial human cardiac development atlas.
