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Determination of the zebrafish forebrain: induction and patterning
1Whitehead Institute for Biomedical Research and Massachusetts Institute of Technology, Nine Cambridge Center, Cambridge, MA 02142, USA.
Development (Cambridge, England)
|October 21, 1998
Summary
Forebrain development in zebrafish requires signaling from the organizer region early in gastrulation. This study identifies key genes and signaling pathways involved in early forebrain patterning.
Area of Science:
- Developmental biology
- Neuroscience
- Zebrafish model organism
Background:
- Forebrain determination and patterning are crucial for brain development.
- Early neural markers like odd-paired-like (opl) and fkh5 are key to understanding these processes.
Purpose of the Study:
- To analyze forebrain determination and patterning in zebrafish (Danio rerio).
- To identify the timing and signaling requirements for early forebrain gene expression.
Main Methods:
- Isolation of zebrafish homologs of neural markers (opl and fkh5).
- In vitro explant assays to study gene expression.
- Embryo manipulation: removal of presumptive prechordal plate and organizer regions.
- In vivo manipulation: implantation of BMP4 beads.
Main Results:
- opl and fkh5 expression patterns define early forebrain regions.
- Forebrain induction occurs by the shield stage, with organizer signaling sufficient for opl activation.
- The organizer is essential for opl expression; its removal abolishes expression.
- Continued organizer function is necessary, as BMP4 inhibits opl expression.
Conclusions:
- Forebrain specification initiates early in zebrafish gastrulation.
- A broad region of dorsal mesendoderm, including the organizer, is critical for forebrain patterning.