Reciprocal repression between Isl1 and Nkx2-5 defines the zebrafish embryonic cardiac pacemaker domain
Federico Tessadori, Laurence Garric, Lysander Blankenborg, Anjelie Kisoensingh, Rahul Rao Padala, Teun P. de Boer, Jeroen Bakkers
This study identifies a zebrafish-specific gene regulatory network where Isl1 restricts Nkx2-5 to maintain pacemaker identity, distinct from mammalian mechanisms.
bioRxiv · Oct 19, 2026 · PreprintDevelopmental Biology