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Development, Vol 126, Issue 7 1427-1438, Copyright © 1999 by Company of Biologists
JOURNAL ARTICLES |
K Fekany, Y Yamanaka, T Leung, HI Sirotkin, J Topczewski, MA Gates, M Hibi, A Renucci, D Stemple, A Radbill, AF Schier, W Driever, T Hirano, WS Talbot and L Solnica-Krezel
Department of Molecular Biology, Vanderbilt University, Box 1820, Station B, Nashville, TN 37235, USA. solnicl@ctrvax.vaderbilt.edu
The dorsal gastrula organizer plays a fundamental role in establishment of the vertebrate axis. We demonstrate that the zebrafish bozozok (boz) locus is required at the blastula stages for formation of the embryonic shield, the equivalent of the gastrula organizer and expression of multiple organizer-specific genes. Furthermore, boz is essential for specification of dorsoanterior embryonic structures, including notochord, prechordal mesendoderm, floor plate and forebrain. We report that boz mutations disrupt the homeobox gene dharma. Overexpression of boz in the extraembryonic yolk syncytial layer of boz mutant embryos is sufficient for normal development of the overlying blastoderm, revealing an involvement of extraembryonic structures in anterior patterning in fish similarly to murine embryos. Epistatic analyses indicate that boz acts downstream of beta-catenin and upstream to TGF-beta signaling or in a parallel pathway. These studies provide genetic evidence for an essential function of a homeodomain protein in beta-catenin-mediated induction of the dorsal gastrula organizer and place boz at the top of a hierarchy of zygotic genes specifying the dorsal midline of a vertebrate embryo.
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