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Science 14 January 2005:
Vol. 307. no. 5707, pp. 247 - 249
DOI: 10.1126/science.1101573
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Reports

Retinoic Acid Signaling Restricts the Cardiac Progenitor Pool

Brian R. Keegan,1 Jessica L. Feldman,1 Gerrit Begemann,2 Philip W. Ingham,3 Deborah Yelon1*

Organogenesis begins with specification of a progenitor cell population, the size of which provides a foundation for the organ's final dimensions. Here, we present a new mechanism for regulating the number of progenitor cells by limiting their density within a competent region. We demonstrate that retinoic acid signaling restricts cardiac specification in the zebrafish embryo. Reduction of retinoic acid signaling causes formation of an excess of cardiomyocytes, via fate transformations that increase cardiac progenitor density within a multipotential zone. Thus, retinoic acid signaling creates a balance between cardiac and noncardiac identities, thereby refining the dimensions of the cardiac progenitor pool.

1 Developmental Genetics Program, Skirball Institute of Biomolecular Medicine, and Department of Cell Biology, New York University School of Medicine, New York, NY 10016, USA.
2 Lehrstuhl Zoology/Evolutionary Biology, University of Konstanz, 78457 Konstanz, Germany.
3 Centre for Developmental Genetics, Department of Biomedical Science, University of Sheffield School of Medicine, Firth Court, Western Bank, Sheffield S10 2TN, UK.

* To whom correspondence should be addressed. E-mail: yelon{at}saturn.med.nyu.edu

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