PUBLICATION
spiel ohne grenzen/pou2 is required during establishment of the zebrafish midbrain-hindbrain boundary organizer
- Authors
- Belting, H.G., Hauptmann, G., Meyer, D., Abdelilah-Seyfried, S., Chitnis, A., Eschbach, C., Söll, I., Thisse, C., Thisse, B., Artinger, K., Lunde, K., and Driever, W.
- ID
- ZDB-PUB-011109-9
- Date
- 2001
- Source
- Development (Cambridge, England) 128(21): 4165-4176 (Journal)
- Registered Authors
- Abdelilah-Seyfried, Salim, Artinger, Kristin Bruk, Belting, Heinz-Georg Paul (Henry), Chitnis, Ajay, Driever, Wolfgang, Hauptmann, Giselbert, Lunde, Karen, Meyer, Dirk, Söll, Iris, Thisse, Bernard, Thisse, Christine
- Keywords
- hindbrain, MHB, midbrain, isthmus, engrailed, fgf8, gbx2, otx2, pax2.1, spg, wnt1, POU domain, Danio rerio, embryonic brain, mid/hindbrain organizer, isthmic organizer, otx2 expression, chick embryo, neural plate, mouse brain, gene, fgf8, mutant
- MeSH Terms
-
- Animals
- DNA-Binding Proteins/genetics
- Embryo, Nonmammalian
- Female
- Fibroblast Growth Factor 8
- Fibroblast Growth Factors/genetics
- Gastrula
- Gene Expression Regulation, Developmental*
- Homeodomain Proteins/genetics
- Mesencephalon/embryology*
- Mutation
- Nerve Tissue Proteins/genetics
- Nuclear Proteins*
- Octamer Transcription Factor-3
- Organizers, Embryonic
- Otx Transcription Factors
- PAX2 Transcription Factor
- PAX5 Transcription Factor
- Paired Box Transcription Factors
- Proteins
- Proto-Oncogene Proteins/genetics
- Rhombencephalon/embryology*
- Trans-Activators/genetics
- Transcription Factors/genetics*
- Transcription Factors/metabolism
- Wnt Proteins
- Wnt1 Protein
- Zebrafish/embryology*
- Zebrafish/genetics
- Zebrafish Proteins*
- PubMed
- 11684654 Full text @ Development
Citation
Belting, H.G., Hauptmann, G., Meyer, D., Abdelilah-Seyfried, S., Chitnis, A., Eschbach, C., Söll, I., Thisse, C., Thisse, B., Artinger, K., Lunde, K., and Driever, W. (2001) spiel ohne grenzen/pou2 is required during establishment of the zebrafish midbrain-hindbrain boundary organizer. Development (Cambridge, England). 128(21):4165-4176.
Abstract
The vertebrate midbrain-hindbrain boundary (MHB) organizes patterning and neuronal differentiation in the midbrain and anterior hindbrain. Formation of this organizing center involves multiple steps, including positioning of the MHB within the neural plate, establishment of the organizer and maintenance of its regional identity and signaling activities. Juxtaposition of the Otx2 and Gbx2 expression domains positions the MHB. How the positional information is translated into activation of Pax2, Wnt1 and Fgf8 expression during MHB establishment remains unclear. In zebrafish spiel ohne grenzen (spg) mutants, the MHB is not established, neither isthmus nor cerebellum form, the midbrain is reduced in size and patterning abnormalities develop within the hindbrain. In spg mutants, despite apparently normal expression of otx2, gbx1 and fgf8 during late gastrula stages, the initial expression of pax2.1, wnt1 and eng2, as well as later expression of fgf8 in the MHB primordium are reduced. We show that spg mutants have lesions in pou2, which encodes a POU-domain transcription factor. Maternal pou2 transcripts are distributed evenly in the blastula, and zygotic expression domains include the midbrain and hindbrain primordia during late gastrulation. Microinjection of pou2 mRNA can rescue pax2.1 and wnt1 expression in the MHB of spg/pou2 mutants without inducing ectopic expression. This indicates an essential but permissive role for pou2 during MHB establishment. pou2 is expressed normally in noi/pax2.1 and ace/fgf8 zebrafish mutants, which also form no MHB. Thus, expression of pou2 does not depend on fgf8 and pax2.1. Our data suggest that pou2 is required for the establishment of the normal expression domains of wnt1 and pax2.1 in the MHB primordium.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping