Myocardium and endocardium of the early mammalian heart tube arise from independent multipotent lineages specified at the primitive streak

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Dev Cell. 2025 May 20;. doi: 10.1016/j.devcel.2025.05.002

Sendra M, McDole K, Hourcade J, Temiño S, Raiola M, Guignard L, Keller PJ, Domínguez JN, Torres M

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Abstract

The formation of the primitive heart tube from cardiomyocytes and endocardial cells is a key event in mammalian development. Previous studies suggested that cardiomyocytes and endocardial cells segregate from a shared cardiac progenitor around the onset of gastrulation, yet their lineage relationship with other mesodermal tissues remains unclear. Using retrospective and prospective clonal analyses in mouse embryos, we traced cardiomyocyte and endocardial progenitors from the primitive streak to the heart tube. Our results identify two independent mesodermal populations specified around gastrulation onset. While each of these populations is unipotent in producing cardiomyocytes or endocardium, they retain multipotency and contribute to different subsets of non-cardiac mesoderm. Nonetheless, live imaging identifies simultaneous ingression and intermingling of these two mesodermal lineages in the primitive streak, showing their coordinated specification and migration. The proposed model for cardiac progenitor specification will help understanding the origins of congenital heart diseases and designing tissue engineering strategies.

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Myocardium and endocardium of the early mammalian heart tube arise from independent multipotent lineages specified at the primitive streak

Abstract

PMID: 40436021 [PubMed - indexed for MEDLINE]

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