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AP2-dependent signals from the ectoderm regulate craniofacial development in the zebrafish embryo.
Robert D Knight1, Yashar Javidan, Tailin Zhang
1Department of Developmental and Cell Biology, University of California, Irvine, CA 92697-2300, USA. tschilli@uci.edu
Development (Cambridge, England)
|June 10, 2005
Summary
AP2 transcription factors Tfap2a and Tfap2b are crucial for zebrafish craniofacial development. They regulate epidermal cell survival and ectodermal signals that induce neural crest cell skeletogenesis.
Area of Science:
- Developmental biology
- Genetics
- Molecular biology
Background:
- AP2 transcription factors regulate embryonic development.
- Tfap2a and Tfap2b are implicated in craniofacial and kidney development in mammals.
Purpose of the Study:
- Investigate the roles of zebrafish tfap2a and tfap2b in craniofacial development.
- Elucidate the function of ectodermal signals in neural crest cell skeletogenesis.
Main Methods:
- Zebrafish gene knockout models for tfap2a and tfap2b.
- Analysis of epidermal cell survival and neural crest cell differentiation.
- Ectoderm transplantation experiments.
Main Results:
- Zebrafish lacking both tfap2a and tfap2b exhibit epidermal defects and absence of neural crest-derived cartilages.
- Skeletal defects occur during the skeletal differentiation stage after neural crest cell migration.
- Transplantation of wild-type ectoderm rescues cartilage development.
Conclusions:
- Zebrafish AP2 transcription factors Tfap2a and Tfap2b are essential for facial ectoderm development.
- These factors regulate epidermal cell survival and ectodermal signals crucial for neural crest cell skeletogenesis.
- AP2 proteins have dual roles: early cell-autonomous functions and later non-autonomous regulation of inductive signals.