Nrarp functions to modulate neural-crest-cell differentiation by regulating LEF1 protein stability

Tohru Ishitani, Kunihiro Matsumoto, Ajay B. Chitnis, Motoyuki Itoh

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)

Abstract

Nrarp (Notch-regulated ankyrin repeat protein) is a small protein that has two ankyrin repeats1-5. Although Nrarp is known to be an inhibitory component of the Notch signalling pathway that operates in different developmental processes1,2,4,5, the in vivo roles of Nrarp have not been fully characterized. Here, we show that Nrarp is a positive regulator in the Wnt signalling pathway. In zebrafish, knockdown of Nrarp-a expression by an antisense morpholino oligonucleotide (MO) results in altered Wnt-signalling-dependent neural-crest-cell development. Nrarp stabilizes LEF1 protein, a pivotal transcription factor in the Wnt signalling cascade, by blocking LEF1 ubiquitination. In accordance with this, the knockdown phenotype of lef1 is similar to that of nrarp-a, at least in part, in its effect on the development of multiple tissues in zebrafish. Furthermore, activation of LEF1 does not affect Notch activity or vice versa. These findings reveal that Nrarp independently regulates canonical Wnt and Notch signalling by modulating LEF1 and Notch protein turnover, respectively.

Original languageEnglish
Pages (from-to)1106-1112
Number of pages7
JournalNature Cell Biology
Volume7
Issue number11
DOIs
Publication statusPublished - Nov 1 2005

All Science Journal Classification (ASJC) codes

  • Cell Biology

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