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Development 2009 Nov 01;13621:3543-8. doi: 10.1242/dev.036715.
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Coordinated activation of the secretory pathway during notochord formation in the Xenopus embryo.

Tanegashima K , Zhao H , Rebbert ML , Dawid IB .

We compared the transcriptome in the developing notochord of Xenopus laevis embryos with that of other embryonic regions. A coordinated and intense activation of a large set of secretory pathway genes was observed in the notochord, but not in notochord precursors in the axial mesoderm at early gastrula stage. The genes encoding Xbp1 and Creb3l2 were also activated in the notochord. These two transcription factors are implicated in the activation of secretory pathway genes during the unfolded protein response, where cells react to the stress of a build-up of unfolded proteins in their endoplasmic reticulum. Xbp1 and Creb3l2 are differentially expressed but not differentially activated in the notochord. Reduction of expression of Xbp1 or Creb3l2 by injection of antisense morpholinos led to strong deficits in notochord but not somitic muscle development. In addition, the expression of some, but not all, genes encoding secretory proteins was inhibited by injection of xbp1 morpholinos. Furthermore, expression of activated forms of Xbp1 or Creb3l2 in animal explants could activate a similar subset of secretory pathway genes. We conclude that coordinated activation of a battery of secretory pathway genes mediated by Xbp1 and Creb/ATF factors is a characteristic and necessary feature of notochord formation.

PubMed ID: 19793890
PMC ID: PMC2761104
Article link: Development
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: cope copz1 creb1 creb3l2 dnajb9 hsp90b1 hspa5 large1 large2 rrbp1 schip1 sec61g sec62 xbp1
Morpholinos: creb3l2 MO1 creb3l2 MO2 xbp1 MO2 xbp1 MO3

GEO Series: GSE8990: NCBI

Article Images: [+] show captions
References [+] :
Adams, The mechanics of notochord elongation, straightening and stiffening in the embryo of Xenopus laevis. 1990, Pubmed, Xenbase