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First published online 8 April 2004
doi: 10.1242/dev.01086
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1 Department of Cell Biology, Duke University Medical Center, Durham, NC 27710,
USA
2 Laboratory of Reproductive and Developmental Toxicology, National Institute of
Environmental Health Sciences, Research Triangle Park, NC 27709, USA
3 Department of Pediatrics, Duke University Medical Center, Durham, NC 27710,
USA
* Author for correspondence (e-mail: kling{at}cellbio.duke.edu)
Accepted 22 January 2004
The neural crest is a multipotent, migratory cell population arising from the border of the neural and surface ectoderm. In mouse, the initial migratory neural crest cells occur at the five-somite stage. Bone morphogenetic proteins (BMPs), particularly BMP2 and BMP4, have been implicated as regulators of neural crest cell induction, maintenance, migration, differentiation and survival. Mouse has three known BMP2/4 type I receptors, of which Bmpr1a is expressed in the neural tube sufficiently early to be involved in neural crest development from the outset; however, earlier roles in other domains obscure its requirement in the neural crest. We have ablated Bmpr1a specifically in the neural crest, beginning at the five-somite stage. We find that most aspects of neural crest development occur normally; suggesting that BMPRIA is unnecessary for many aspects of early neural crest biology. However, mutant embryos display a shortened cardiac outflow tract with defective septation, a process known to require neural crest cells and to be essential for perinatal viability. Surprisingly, these embryos die in mid-gestation from acute heart failure, with reduced proliferation of ventricular myocardium. The myocardial defect may involve reduced BMP signaling in a novel, minor population of neural crest derivatives in the epicardium, a known source of ventricular myocardial proliferation signals. These results demonstrate that BMP2/4 signaling in mammalian neural crest derivatives is essential for outflow tract development and may regulate a crucial proliferation signal for the ventricular myocardium.
Key words: BMPRIA, Neural crest, Heart, Outflow tract, Myocardium, Epicardium
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