PUBLICATION
Canopy1, a Novel Regulator of FGF Signaling around the Midbrain-Hindbrain Boundary in Zebrafish
- Authors
- Hirate, Y., and Okamoto, H.
- ID
- ZDB-PUB-060302-11
- Date
- 2006
- Source
- Current biology : CB 16(4): 421-427 (Journal)
- Registered Authors
- Hirate, Yoshikazu, Okamoto, Hitoshi
- Keywords
- SIGNALING; DEVBIO; MOLNEURO
- MeSH Terms
-
- Amino Acid Sequence
- Animals
- Brain Stem/embryology*
- Brain Stem/physiology*
- Endoplasmic Reticulum/chemistry
- Fibroblast Growth Factor 8/physiology*
- Molecular Sequence Data
- Nerve Tissue Proteins/chemistry
- Nerve Tissue Proteins/physiology*
- Receptor, Fibroblast Growth Factor, Type 1/physiology
- Signal Transduction
- Zebrafish/embryology*
- Zebrafish Proteins/chemistry
- Zebrafish Proteins/physiology*
- PubMed
- 16488878 Full text @ Curr. Biol.
Citation
Hirate, Y., and Okamoto, H. (2006) Canopy1, a Novel Regulator of FGF Signaling around the Midbrain-Hindbrain Boundary in Zebrafish. Current biology : CB. 16(4):421-427.
Abstract
FGF signaling from the midbrain-hindbrain boundary (MHB, isthmus) plays a major role both in maintenance of the MHB and induction of the tectum and cerebellum . Since different levels of FGF signaling in the MHB result in a qualitative difference in inducing activity , FGF signaling in the MHB should be tightly regulated positively and negatively at multiple steps to ensure correct levels of FGF signaling . Factors that negatively regulate FGF signal around the MHB are reported . However, factors that ensure strong FGF signal in the MHB are largely unknown. Here we report the identification of Canopy1 (Cnpy1), a novel MHB-specific, Saposin-related protein that belongs to an evolutionarily conserved protein family. The cnpy1 gene was expressed specifically in the MHB of zebrafish embryos. Exogenous FGF8 induced expression of cnpy1 in the tectal primordial. Knockdown of cnpy1 resulted in MHB defects and impaired FGF signaling in a cell-autonomous manner. Cnpy1 is localized in the endoplasmic reticulum and interacts with FGFR1. This study highlights a positive-feedback loop between the FGFR pathway and Cnpy1 that may ensure the strength of FGF signaling in the MHB, leading to correct development of the tectum and cerebellum.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping