期刊
DEVELOPMENT
卷 131, 期 13, 页码 3081-3091出版社
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/dev.01185
关键词
zebrafish; ventricle; atrium; myocardium; endocardium; fate map; nodal
资金
- NHLBI NIH HHS [R01 HL69594] Funding Source: Medline
- NICHD NIH HHS [T32HD07520] Funding Source: Medline
Organogenesis requires the specification of a variety of cell types and the organization of these cells into a particular three-dimensional configuration. The embryonic vertebrate heart is organized into two major chambers, the ventricle and atrium, each consisting of two tissue layers, the myocardium and endocardium. The cellular and molecular mechanisms responsible for the separation of ventricular and atrial lineages are not well understood. To test models of cardiac chamber specification, we generated a high-resolution fate map of cardiac chamber progenitors in the zebrafish embryo at 40% epiboly, a stage prior to the initiation of gastrulation. Our map reveals a distinct spatial organization of myocardial progenitors: ventricular myocardial progenitors are positioned closer to the margin and to the dorsal midline than are atrial myocardial progenitors. By contrast, ventricular and atrial endocardial progenitors are not spatially organized at this stage. The relative orientations of ventricular and atrial myocardial progenitors before and after gastrulation suggest orderly movements of these populations. Furthermore, the initial positions of myocardial progenitors at 40% epiboly indicate that signals residing at the embryonic margin could influence chamber fate assignment. Indeed, via fate mapping, we demonstrate that Nodal signaling promotes ventricular fate specification near the margin, thereby playing an important early role during myocardial patterning.
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