Related Experiment Videos
Dlx-5 in limb initiation in the chick embryo
D Ferrari1, A Harrington, C N Dealy
1Department of Genetics and Developmental Biology, University of Connecticut Health Center, Farmington, Connecticut 06030, USA.
Summary
Distal-less homeobox 5 (Dlx-5) acts as an early molecular marker for vertebrate limb initiation. Its expression in chick embryos distinguishes limb-forming regions before bud formation and is induced by FGF2, suggesting a role in limb development.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Dlx-5 is a vertebrate homolog of Drosophila Distal-less, a key gene in fly limb formation.
- Understanding early limb development in vertebrates is crucial for developmental biology research.
Purpose of the Study:
- To investigate the role of Dlx-5 in the initiation of limb development in chick embryos.
- To identify early molecular markers for vertebrate limb formation.
Main Methods:
- Examining Dlx-5 expression patterns in chick embryos at different developmental stages.
- Using FGF2-soaked beads to induce ectopic limb formation and observe Dlx-5 expression.
- Analyzing Dlx-5 expression in amelic limbless mutant chick embryos.
Main Results:
- Dlx-5 is highly and specifically expressed in presumptive limb ectoderm before limb bud formation.
- Dlx-5 expression is rapidly induced in non-limb-forming regions upon FGF2 stimulation.
- Dlx-5 is transiently expressed in the limb buds of limbless mutant embryos.
Conclusions:
- Dlx-5 serves as an early molecular marker distinguishing limb-forming territories.
- Dlx-5 is involved in the initial specification and formation of limb buds.
- FGF2 signaling influences Dlx-5 expression, potentially mediating limb induction.