Wnt1 regulates neurogenesis and mediates lateral inhibition of boundary cell specification in the zebrafish hindbrain

被引:85
作者
Amoyel, M
Cheng, YC
Jiang, YJ
Wilkinson, DG
机构
[1] Natl Inst Med Res, Div Dev Neurobiol, London NW7 1AA, England
[2] Natl Univ Singapore, Lab Dev Signalling & Patterning, Inst Mol & Cell Biol, Singapore 117604, Singapore
来源
DEVELOPMENT | 2005年 / 132卷 / 04期
基金
英国医学研究理事会;
关键词
hindbrain; boundary; wnt1; neurogenesis; lateral inhibition;
D O I
10.1242/dev.01616
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
The formation of localised signalling centres is essential for patterning of a number of tissues during development. Previous work has revealed that a distinct population of boundary cells forms at the interface of segments in the vertebrate hindbrain, but the role of these cells is not known. We have investigated the function of the Wnt1 signalling molecule that is expressed by boundary and roof plate cells in the zebrafish hindbrain. Knockdown of wnt1 or of tcf3b, a mediator of Wnt signalling, leads to ectopic expression of boundary cell markers, rfng and foxb1.2, in non-boundary regions of the hindbrain. Ectopic boundary marker expression also occurs following knockdown of rfng, a modulator of Notch signalling required for wnt1 expression at hindbrain boundaries. We show that the boundary and roof plate expression of wnt1 each contribute to upregulation of proneural and delta gene expression and neurogenesis in non-boundary regions, which in turn blocks ectopic boundary marker expression. Boundary cells therefore play a key role in the regulation of cell differentiation in the zebrafish hindbrain. The network of genes underlying the regulation of neurogenesis and lateral inhibition of boundary cell formation by Wnt1 has a striking similarity to mechanisms at the dorsoventral boundary in the Drosophila wing imaginal disc.
引用
收藏
页码:775 / 785
页数:11
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