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Development 2003 May 01;13010:2225-38. doi: 10.1242/dev.00443.
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Notch activates sonic hedgehog and both are involved in the specification of dorsal midline cell-fates in Xenopus.

López SL , Paganelli AR , Siri MV , Ocaña OH , Franco PG , Carrasco AE .

We analysed the role of Notch signalling during the specification of the dorsal midline in Xenopus embryos. By activating or blocking the pathway we found that Notch expands the floor plate domain of sonic hedgehog and pintallavis and represses the notochordal markers chordin and brachyury, with a concomitant reduction of the notochord size. We propose that within a population of the early organiser with equivalent potential to develop either as notochord or floor plate, Notch activation favours floor plate development at the expense of the notochord, preferentially before mid gastrula. We present evidence that sonic hedgehog down-regulates chordin, suggesting that secreted Sonic hedgehog may be involved or reinforcing the cell-fate switch executed by Notch. We also show that Notch signalling requires Presenilin to modulate this switch.

PubMed ID: 12668635
Article link: Development

Species referenced: Xenopus laevis
Genes referenced: chrd foxa4 gal.2 gli3 notch1 nucb1 psen1 shh tbxt tubb2b
Morpholinos: notch1 MO1 psen1 MO1

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