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Function of BMPs in the apical ectoderm of the developing mouse limb
Chi-Kuang Leo Wang1, Minoru Omi, Deborah Ferrari
1Center for Limb and Skeletal Development, Department of BioStructure and Function, School of Dental Medicine, University of Connecticut Health Center, Farmington, CT 06030, USA.
Developmental Biology
|April 15, 2004
Summary
Bone morphogenetic proteins (BMPs) in the apical ectodermal ridge (AER) regulate limb development. Inhibiting BMPs in transgenic mice caused severe limb malformations, indicating BMPs control AER boundaries and mesodermal apoptosis.
Area of Science:
- Developmental biology
- Molecular biology
- Genetics
Background:
- The apical ectodermal ridge (AER) is crucial for limb outgrowth and patterning.
- Bone morphogenetic proteins (BMPs) are expressed in the AER, but their functions are poorly understood.
Purpose of the Study:
- To investigate the role of BMPs in the apical ectoderm during limb development.
- To elucidate the function of AER-specific BMP signaling in limb patterning and morphogenesis.
Main Methods:
- Utilized transgenic mice with targeted expression of the BMP antagonist noggin to the AER using the Msx2 promoter.
- Analyzed limb morphology, patterning, and gene expression in Msx2-noggin mutant mice.
Main Results:
- Msx2-noggin mutant mice exhibited severe limb defects, including syndactyly and polydactyly.
- Mutant limb buds showed expanded AER with persistent activity and altered dorsoventral (DV) and anteroposterior (AP) patterning.
- Failure of distal subectodermal mesoderm apoptosis was observed in mutant limbs.
Conclusions:
- Apical ectodermal BMPs delimit AER boundaries, modulate AER signaling strength, and regulate distal mesoderm apoptosis.
- Ectodermal BMP signaling is essential for normal limb development and dorsoventral patterning.