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Background  Morphological and functional differences of the right and left ventricle are apparent in the adult human heart. A differential contribution of cardiac fibroblasts and smooth muscle cells (populations of epicardium-derived cells) to each ventricle may account for part of the morphological-functional disparity. Here we studied the relation between epicardial derivatives and the development of compact ventricular myocardium.    Results  Wildtype and Wt1 CreERT2/+  reporter mice were used to study WT-1 expressing cells, and Tcf21 lacZ/+  reporter mice and PDGFRα -/- ;Tcf21 LacZ/+  mice to study the formation of the cardiac fibroblast population. After covering the heart, intramyocardial WT-1+ cells were first observed at the inner curvature, the right ventricular postero-lateral wall and left ventricular apical wall. Later, WT-1+ cells were present in the walls of both ventricles, but significantly more pronounced in the left ventricle. Tcf21- LacZ  + cells followed the same distribution pattern as WT-1+ cells but at later stages, indicating a timing difference between these cell populations. Within the right ventricle, WT-1+ and Tcf21-lacZ+ cell distribution was more pronounced in the posterior inlet part. A gradual increase in myocardial wall thickness was observed early in the left ventricle and at later stages in the right ventricle. PDGFRα -/- ;Tcf21 LacZ/+  mice showed deficient epicardium, diminished number of Tcf21- LacZ  + cells and reduced ventricular compaction.    Conclusions  During normal heart development, spatio-temporal differences in contribution of WT-1 and Tcf21- LacZ  + cells to right versus left ventricular myocardium occur parallel to myocardial thickening. These findings may relate to lateralized differences in ventricular (patho)morphology in humans.

Regional differences in WT-1 and Tcf21 expression during ventricular development: implications for myocardial compaction