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Int J Dev Biol January 1, 2012; 56 (4): 239-44.

xCOUP-TF-B regulates xCyp26 transcription and modulates retinoic acid signaling for anterior neural patterning in Xenopus.

Tanibe M , Ishiura S , Asashima M , Michiue T .

Early embryogenesis in Xenopus development depends on correct anterior-posterior (A-P) neural patterning during gastrulation. It is known that high levels of retinoic acid (RA), a major intracellular signaling molecule, determine posterior cell fate, also reflecting an involvement in A-P neural patterning. Here we show that the known RA effector, xCOUP-TF, plays important roles in head development of Xenopus embryo. xCOUP-TF-B injection into the dorsal region of embryos induced formation of an abnormal head with small eyes. Analysis of brain marker gene expression revealed that xCOUP-TF-B injection induced slight anteriorization in embryos and attenuated the effects of RA treatment. This anteriorization effect was enhanced when xCOUP-TF-B was co-injected with xCyp26A or xCyp26C, which are known RA metabolizing factors. Furthermore, xCOUP-TF-B injection enhanced xCyp26A/C transcription. Together, these results suggest that xCOUP-TF and xCyp26 are both regulated by Wnt signaling, and cooperatively function in RA signaling to affect A-P neural patterning.

PubMed ID: 22562199
Article link: Int J Dev Biol

Species referenced: Xenopus laevis
Genes referenced: ctnnb1 cyp26a1 cyp26c1 egr2 en2 foxg1 gal.2 nr2f2 nr2f5 odc1 otx2 snai2 sox2 tbx2 tf

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