The level of HAND1 controls the specification of multipotent cardiac and extraembryonic progenitors
Lynch, A. T.; Phillips, N.; Douglas, M.; Dorgnach, M.; Lin, I.-H.; Adamson, A. D.; Darieva, Z.; Whittle, J.; Hanley, N. A.; Bobola, N.; Birket, M. J.
Show abstract
Diverse sets of progenitors contribute to the development of the embryonic heart, but the mechanisms of their specification have remained elusive. Here, using a human pluripotent stem cell (hPSC) model, we deciphered cardiac and non-cardiac lineage trajectories in differentiation and identified transcription factors underpinning cell specification, identity and function. We discovered a concentration-dependent, fate determining function in mesodermal progenitors for the basic helix-loop-helix transcription factor HAND1 and uncovered its gene regulatory network. At low level, HAND1 directs differentiation towards multipotent juxta-cardiac field progenitors able to make cardiomyocytes and epicardial cells, whereas at high level it promotes the development of extraembryonic mesoderm. Importantly, HAND1-low progenitors can be propagated in their multipotent state. This detailed mechanistic insight into human development will accelerate the delivery of effective disease modelling, including for congenital heart disease, and cell therapy-based regenerative medicine.
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