期刊
GENES & DEVELOPMENT
卷 21, 期 10, 页码 1244-1257出版社
COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
DOI: 10.1101/gad.1543607
关键词
mouse; Hedgehog; neural tube; development; Gas1; Cdo
资金
- NINDS NIH HHS [R37 NS033642] Funding Source: Medline
Hedgehog (Hh) signaling is critical for patterning and growth during mammalian embryogenesis. Transcriptional profiling identified Growth-arrest-specific 1 (Gas1) as a general negative target of Shh signaling. Data presented here define Gas1 as a novel positive component of the Shh signaling cascade. Removal of Gas1 results in a Shh dose- dependent loss of cell identities in the ventral neural tube and facial and skeletal defects, also consistent with reduced Shh signaling. In contrast, ectopic Gas1 expression results in Shh- dependent cell-autonomous promotion of ventral cell identities. These properties mirror those of Cdo, an unrelated, cell surface Shh-binding protein. We show that Gas1 and Cdo cooperate to promote Shh signaling during neural tube patterning, craniofacial, and vertebral development. Overall, these data support a new paradigm in Shh signaling whereby positively acting ligand- binding components, which are initially expressed in responding tissues to promote signaling, are then down- regulated by active Hh signaling, thereby modulating responses to ligand input.
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