- 积分
- 13286
- 威望
- 13286
- 包包
- 34831
|
Neural crest cells organize the eye via TGF-β and canonical Wnt signalling7 `9 u% h! T2 o6 q: `
Nature Communications Volume: 2, Article number: 265 DOI: doi:10.1038/ncomms1269
/ b2 @: `, `8 _; @3 |Received 18 October 2010 Accepted 09 March 2011 Published 05 April 2011
4 |/ X' g- K$ P5 l1 ]2 {2 ~abstract" i6 y0 T7 z. C/ {
In vertebrates, the lens and retina arise from different embryonic tissues raising the question of how they are aligned to form a functional eye. Neural crest cells are crucial for this process: in their absence, ectopic lenses develop far from the retina. Here we show, using the chick as a model system, that neural crest-derived transforming growth factor-βs activate both Smad3 and canonical Wnt signalling in the adjacent ectoderm to position the lens next to the retina. They do so by controlling Pax6 activity: although Smad3 may inhibit Pax6 protein function, its sustained downregulation requires transcriptional repression by Wnt-initiated β-catenin. We propose that the same neural crest-dependent signalling mechanism is used repeatedly to integrate different components of the eye and suggest a general role for the neural crest in coordinating central and peripheral parts of the sensory nervous system.! `: P# K4 \( \5 b. D5 ~1 z
) U- v+ R5 ~" u& Q5 O+ s9 phttp://www.nature.com/ncomms/journal/v2/n4/abs/ncomms1269.html |
|