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RESEARCH COMMUNICATION
1 Instituto Gulbenkian de Ciência, 2781-901 Oeiras, Portugal; 2 Centro de Biomedicina Molecular e Estrutural, Universidade do Algarve, Campus de Gambelas, 8000-010 Faro, Portugal; 3 Department of Histology, Microbiology, and Medical Biotechnologies, Section of Histology and Embryology, University of Padua, 35121 Padua, Italy
Correct establishment of the left/right (L/R) body asymmetry in the mouse embryo requires asymmetric activation of the evolutionarily conserved Nodal signaling cascade in the left lateral plate mesoderm (L-LPM). Furthermore, the presence of Nodal in the node is essential for its own expression in the L-LPM. Here, we have characterized the function of cerl-2, a novel Nodal antagonist, which displays a unique asymmetric expression on the right side of the mouse node. cerl-2 knockout mice display multiple laterality defects including randomization of the L/R axis. These defects can be partially rescued by removing one nodal allele. Our results demonstrate that Cerl-2 plays a key role in restricting the Nodal signaling pathway toward the left side of the mouse embryo by preventing its activity in the right side.
[Keywords: L/R asymmetry; nodal signaling; Cerberus; nodal flow; Cerl-2]
Received April 22, 2004; revised version accepted August 4, 2004.
Article and publication are at http://www.genesdev.org/cgi/doi/10.1101/gad.306504.
4 Corresponding author.
E-MAIL jbelo{at}igc.gulbenkian.pt; FAX 351-21-4407970.
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