Hox and Pbx factors control retinoic acid synthesis during hindbrain segmentation.

Hox and Pbx factors control retinoic acid synthesis during hindbrain segmentation.
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DOI:
10.1016/j.devcel.2011.03.011
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发表时间:
2011-04-19
期刊:
影响因子:
11.8
通讯作者:
Rijli, Filippo M.
Rijli, Filippo M.
中科院分区:
生物学1区
文献类型:
--
作者:
Vitobello, Antonio;Ferretti, Elisabetta;Lampe, Xavier;Vilain, Nathalie;Ducret, Sebastien;Ori, Michela;Spetz, Jean-Francois;Selleri, Licia;Rijli, Filippo M.

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In vertebrate embryos, retinoic acid (RA) synthesized in the mesoderm by Raldh2 emanates to the hind-brain neuroepithelium, where it induces anteroposterior (AP)-restricted Hox expression patterns and rhombomere segmentation. However, how appropriate spatiotemporal RA activity is generated in the hindbrain is poorly understood. By analyzing Pbx1/Pbx2 and Hoxa1/Pbx1 null mice, we found that Raldh2 is itself under the transcriptional control of these factors and that the resulting RA-deficient phenotypes can be partially rescued by exogenous RA. Hoxa1-Pbx1/2-Meis2 directly binds a specific regulatory element that is required to maintain normal Raldh2 expression levels in vivo. Mesoderm-specific Xhoxa1 and Xpbx1b knockdowns in Xenopus embryos also result in Xraldh2 downregulation and hindbrain defects similar to mouse mutants, demonstrating conservation of this Hox-Pbx-dependent regulatory pathway. These findings reveal a feed-forward mechanism linking Hox-Pbx-dependent RA synthesis during early axial patterning with the establishment of spatially restricted Hox-Pbx activity in the developing hindbrain.
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