biostudies-literatureUnknown3Devine WPAmerican Heart AssociationNational Center for Research ResourcesNational Heart, Lung, and Blood InstituteMinistry of Education, Culture, Sports, Science, and TechnologyNational Institutes of HealthCalifornia Institute for Regenerative MedicineFumi Yamamura Memorial Foundation for Female Natural ScientistsMammalian heart development requires precise allocation of cardiac progenitors. The existence of a multipotent progenitor for all anatomic and cellular components of the heart has been predicted but its identity and contribution to the two cardiac progenitor 'fields' has remained undefined. Here we show, using clonal genetic fate mapping, that Mesp1+ cells in gastrulating mesoderm are rapidly specified into committed cardiac precursors fated for distinct anatomic regions of the heart. We identify Smarcd3 as a marker of early specified cardiac precursors and identify within these precursors a compartment boundary at the future junction of the left and right ventricles that arises prior to morphogenesis. Our studies define the timing and hierarchy of cardiac progenitor specification and demonstrate that the cellular and anatomical fate of mesoderm-derived cardiac cells is specified very early. These findings will be important to understand the basis of congenital heart defects and to derive cardiac regeneration strategies.eLifehttps://www.ebi.ac.uk/biostudies/studies/S-EPMC4356145biostudies-literatureEarly patterning and specification of cardiac progenitors in gastrulating mesoderm.PMC4356145Scientist Development Grant 12SDG12060353Grants-in-Aid for Scientific Research (C)Predoctoral Training in Developmental Biology, T32 HD 007470R01HL114948Bench to Bassinet Program U01HL098179Program for Young Independent ResearchersTraining Grant 5T32-HL007731-20Clinical Scholar TG2-01160Established Investigator AwardC06 RR018928, to the J. David Gladstone InstitutesBruneau BGDevine WPGeorge MWythe JDKoshiba-Takeuchi KfalseEarly patterning and specification of cardiac progenitors in gastrulating mesoderm.Mammalian heart development requires precise allocation of cardiac progenitors. The existence of a multipotent progenitor for all anatomic and cellular components of the heart has been predicted but its identity and contribution to the two cardiac progenitor 'fields' has remained undefined. Here we show, using clonal genetic fate mapping, that Mesp1+ cells in gastrulating mesoderm are rapidly specified into committed cardiac precursors fated for distinct anatomic regions of the heart. We identify Smarcd3 as a marker of early specified cardiac precursors and identify within these precursors a compartment boundary at the future junction of the left and right ventricles that arises prior to morphogenesis. Our studies define the timing and hierarchy of cardiac progenitor specification and demonstrate that the cellular and anatomical fate of mesoderm-derived cardiac cells is specified very early. These findings will be important to understand the basis of congenital heart defects and to derive cardiac regeneration strategies.2014-01-01T00:00:00Z2014 Oct2025-04-19T23:58:58.812Z2019-03-27T01:48:00ZS-EPMC43561452529602410.7554/eLife.03848