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Development ePress online publication date 17 Aug 2005
doi: 10.1242/dev.01970
Research article: Development and disease
Genetic and cellular analyses of zebrafish atrioventricular cushion and valve development
Dimitris Beis,
Thomas Bartman,
Suk-Won Jin,
Ian C. Scott,
Leonard A. D'Amico,
Elke A. Ober,
Heather Verkade,
Julie Frantsve,
Holly A. Field,
Ann Wehman,
Herwig Baier,
Alexandra Tallafuss,
Laure Bally-Cuif,
Jau-Nian Chen,
Didier Y.R. Stainier*,
and
Benno Jungblut
* Author for correspondence (e-mail: didier stainier{at}biochem.ucsf.edu)
Defects in cardiac valve morphogenesis and septation of the heart chambers constitute some of the most common human congenital abnormalities. Some of these defects originate from errors in atrioventricular (AV) endocardial cushion development. Although this process is being extensively studied in mouse and chick, the zebrafish system presents several advantages over these models, including the ability to carry out forward genetic screens and study vertebrate gene function at the single cell level. In this paper, we analyze the cellular and subcellular architecture of the zebrafish heart during stages of AV cushion and valve development and gain an unprecedented level of resolution into this process. We find that endocardial cells in the AV canal differentiate morphologically before the onset of epithelial to mesenchymal transformation, thereby defining a previously unappreciated step during AV valve formation. We use a combination of novel transgenic lines and fluorescent immunohistochemistry to analyze further the role of various genetic (Notch and Calcineurin signaling) and epigenetic (heart function) pathways in this process. In addition, from a large-scale forward genetic screen we identified 55 mutants, defining 48 different genes, that exhibit defects in discrete stages of AV cushion development. This collection of mutants provides a unique set of tools to further our understanding of the genetic basis of cell behavior and differentiation during AV valve development.
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