Mesoderm posterior basic helix-loop-helix transcription factor 1 (MESP1)

Mesoderm posterior basic helix-loop-helix transcription factor 1 (MESP1) is a master regulatory transcription factor critically involved in early embryonic development, particularly in the specification of cardiovascular progenitors in the mesoderm[1][3]. MESP1 is expressed transiently during gastrulation, marking progenitors that give rise to all major cardiac lineages—including myocardium, endocardium, epicardium, and the cardiac conduction system[3]. It functions at the top of the cardiovascular gene regulatory hierarchy, rapidly inducing other cardiac transcription factors (e.g., Nkx2-5, Gata4, Hand2, Mef2c) and promoting mesoderm differentiation while repressing genes involved in alternative fates such as endoderm or hematopoietic lineages[1][3]. Loss of MESP1 function in mice causes defects in heart formation due to impaired migration and specification of cardiac progenitor cells, although some redundancy exists with the related factor MESP2[3]. MESP1 is not a druggable target in standard therapeutic contexts; rather, its primary importance is in developmental and regenerative biology research, where manipulation of its expression in embryonic stem cells is used to direct cardiogenesis in vitro[1][3][2].

Other names

Mesoderm posterior protein 1BHLHC5bHLHc5MGC10676Class C basic helix-loop-helix protein 5mesoderm posterior 1 homologmesoderm posterior protein 1Mesp1