First published online December 28, 2004
Development 132, 202e (2005)
© The Company of Biologists Limited
Neural induction controversy resolved?
How neural induction is achieved in vertebrates is hotly debated. The
default model of neural induction, which is based on experiments in frog
ectodermal explants, proposes that inhibition of bone morphogenetic protein
(BMP) signalling specifies neural fate. In chick and zebrafish embryos,
however, neural induction is initiated by fibroblast growth factor (FGF)
signalling. Delaune and colleagues now report that neural induction in whole
frog embryos requires both FGF signalling and BMP inhibition (see p.
299). By using BMP and
FGF signalling inhibitors, the researchers show that pre-gastrula ectodermal
FGF signalling is required for neural induction in frogs. They propose that,
in addition to inhibiting BMP, FGF signalling directly drives neural
induction. However, definitive proof of a BMP-independent role for FGF
signalling in frog neural induction awaits the identification of a
transcriptional target that acts in a pathway that is essentially required for
neural specification.
Related articles in Development:
- Neural induction in Xenopus requires early FGF signalling in addition to BMP inhibition
- Emilie Delaune, Patrick Lemaire, and Laurent Kodjabachian
Development 2005 132: 299-310.
[Abstract]
[Full Text]