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Left-Right Asymmetrical Development of the Proepicardium

Author(s): Jan Schlueter | Thomas Brand

Journal: Journal of Developmental Biology
ISSN 2221-3759

Volume: 1;
Issue: 2;
Start page: 126;
Date: 2013;
Original page

Keywords: chicken embryo | FGF8 | SNAI1 | PITX2 | TBX18 | WT1 | inflow tract | sinus venosus

The proepicardium (PE) is a cluster of cells that forms on the cardiac inflow tract and gives rise to the epicardium and connective tissue and largely contributes to the coronary vasculature. In many vertebrates, the PE undergoes left-right asymmetrical development. While PE cells and marker genes can be initially found on both sides, only the right-sided PE will fully develop and ultimately deliver cells to the heart. Several signalling inputs, like FGF and BMP signals, are involved in PE induction in the lateral plate mesoderm, as well as during inflow tract formation and, also, control asymmetric PE development. These signalling events will be put into the context of embryonic left-right asymmetry determination. Finally, it will be discussed whether PE development may serve as a readout for asymmetric inflow tract morphogenesis.
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