Wt1 and epicardial fate mapping.

Abstract:

RATIONALE:The embryonic epicardium is a crucial cell source of the cardiac fibrous skeleton as well as of the coronary system. Genetic lineage tracing systems based on Wt1 regulatory sequences provided evidence that epicardium-derived cells also adopt a myocardial fate in the mouse. OBJECTIVE:To define the adequacy of Wt1-based lineage tracing systems for epicardial fate mapping. METHODS AND RESULTS:Using in situ hybridization analysis and immunofluorescence on tissue sections, we detected endogenous expression of Wt1 mRNA and Wt1 protein in the proepicardium and epicardium and also in endothelial cells throughout cardiogenesis. Expression analysis of a sensitive GFP reporter showed that recombination mediated by cre recombinase in the Wt1(creEGFP) line occurs randomly and sporadically in all cells of the embryo. Recombination in cardiomyocytes was found in the linear heart tube before establishment of a (pro)epicardium. In contrast, the tamoxifen-inducible Wt1(creERT2) mouse line mediated poor and variable recombination in the epicardium. Recombination in cardiomyocytes was not detected in this case. CONCLUSIONS:Frequently used Wt1 based cre-mediated lineage tracing systems are not suitable for epicardial fate mapping because of endogenous endothelial expression of Wt1, ectopic recombination (Wt1(creEGFP)), and poor recombination efficiency (Wt1(creERT2)) in the developing heart. We conclude that claims of a cardiomyocyte fate of epicardial cells in the mouse are not substantiated.

journal_name

Circ Res

journal_title

Circulation research

authors

Rudat C,Kispert A

doi

10.1161/CIRCRESAHA.112.273946

subject

Has Abstract

pub_date

2012-07-06 00:00:00

pages

165-9

issue

2

eissn

0009-7330

issn

1524-4571

pii

CIRCRESAHA.112.273946

journal_volume

111

pub_type

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