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Identification of evolutionarily conserved regulatory elements in the mouse Fgf8 locus.
Friedrich Beermann1, Kostas Kaloulis, Denise Hofmann
1Swiss Institute for Experimental Cancer Research (ISREC), Epalinges, Switzerland.
Genesis (New York, N.Y. : 2000)
|January 7, 2006
Summary
Researchers identified novel regulatory elements controlling fibroblast growth factor 8 (Fgf8) gene expression. These elements are crucial for Fgf8
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- Fibroblast growth factor 8 (Fgf8) is a critical secreted signaling molecule.
- Fgf8 is essential for embryonic signaling centers like the isthmic organizer, first branchial arch (BA1), and apical ectodermal ridge (AER).
- The precise mechanisms establishing dynamic Fgf8 expression patterns are largely unknown.
Purpose of the Study:
- To investigate the regulatory elements governing Fgf8 gene expression.
- To understand how specific Fgf8 expression patterns are established during embryonic development.
Main Methods:
- DNA sequence comparisons across vertebrate Fgf8 loci.
- Transgenic approaches in mice, including bacterial artificial chromosome (BAC) rescue experiments.
- Analysis of conserved noncoding sequences and their expression patterns.
Main Results:
- A BAC containing the mouse Fgf8 gene partially rescued Fgf8-deficient mice and controlled reporter gene expression.
- Highly conserved noncoding sequences were identified predominantly 3' of the Fgf8 coding region.
- Specific conserved elements directed expression to AER, tail bud, and brain regions, including the isthmic organizer.
Conclusions:
- Novel cis-acting regulatory elements for the Fgf8 gene have been identified.
- These elements are sufficient to drive Fgf8 expression in key developmental regions.
- This research provides insight into the genetic control of Fgf8 expression patterns.