Abstract:
:In tetrapods, the anteroposterior (AP) patterning of the limb is under the control of the antagonistic activities of the secreted factor Sonic hedgehog (Shh) and Gli3R, the truncated repressor form of the transcription factor Gli3. In this report, we show that Msx1 and Msx2 are targets and downstream effectors of Gli3R. Consequently, in Shh null mutants, Msx genes are overexpressed and, furthermore, partially responsible for the limb phenotype. This is exemplified by the fact that reducing Msx activity in Shh mutants partially restores a normal limb development. Finally, we show that the main action of the Msx genes, in both normal and Shh(-/-) limb development, is to control cell death in the mesenchyme. We propose that, in the limb, Msx genes act downstream of the Shh/Gli3 pathway by transducing BMP signaling and that, in the absence of Shh signaling, their deregulation contributes to the extensive apoptosis that impairs limb development.
journal_name
Dev Bioljournal_title
Developmental biologyauthors
Lallemand Y,Bensoussan V,Cloment CS,Robert Bdoi
10.1016/j.ydbio.2009.04.038subject
Has Abstractpub_date
2009-07-15 00:00:00pages
189-98issue
2eissn
0012-1606issn
1095-564Xpii
S0012-1606(09)00300-5journal_volume
331pub_type
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