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Development 2004 Feb 01;1314:851-62. doi: 10.1242/dev.00983.
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XSEB4R, a novel RNA-binding protein involved in retinal cell differentiation downstream of bHLH proneural genes.

Boy S , Souopgui J , Amato MA , Wegnez M , Pieler T , Perron M .

RNA-binding proteins play key roles in the post-transcriptional regulation of gene expression but so far they have not been studied extensively in the context of developmental processes. We report on the molecular cloning and spatio-temporal expression of a novel RNA-binding protein, XSEB4R, which is strongly expressed in the nervous system. This study is focused on the analysis of Xseb4R in the context of primary neurogenesis and retinogenesis. To study Xseb4R function during eye development, we set up a new protocol allowing in vivo lipofection of antisense morpholino oligonucleotides into the retina. The resulting XSEB4R knockdown causes an impairment of neuronal differentiation, with an increase in the number of glial cells. By contrast, our gain-of-function analysis demonstrates that Xseb4R strongly promotes neural differentiation. We also showed a similar function during primary neurogenesis. Consistent with this proneural effect, we found that in the open neural plate Xseb4R expression is upregulated by the proneural gene XNgnr1, as well as by the differentiation gene XNeuroD, but is inhibited by the Notch/Delta pathway. Altogether, our results suggest for the first time a proneural effect for a RNA-binding protein involved in the genetic network of retinogenesis.

PubMed ID: 14736748
Article link: Development

Species referenced: Xenopus
Genes referenced: neurod1 neurog2 notch1 rbm24 rbm38 tubb2b
Morpholinos: rbm38 MO1 rbm38 MO2

Phenotypes: Xla Wt + neurod1 (fig.7.c, d) [+]

Article Images: [+] show captions