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BMP regulates vegetal pole induction centres in early xenopus development
N Nachaliel1, Y Re'Em-Kalma, O Eshed
1Department of Biochemistry, The Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa 31096, Israel.
Genes to Cells : Devoted to Molecular & Cellular Mechanisms
|January 20, 1999
Summary
Bone morphogenetic protein (BMP) signaling regulates mesoderm induction centers in Xenopus. BMP-4 promotes ventral mesoderm, while BMP-2/4 dominant-negative receptor promotes dorsal mesoderm, influencing early embryonic development.
Area of Science:
- Developmental Biology
- Molecular Biology
- Xenopus laevis Research
Background:
- Bone morphogenetic protein (BMP) is crucial for mesoderm patterning in Xenopus embryos.
- While BMP's role in marginal zone patterning is known, its early function in vegetal mesoderm induction centers is unclear.
Purpose of the Study:
- To investigate the role of BMP signaling in the formation of vegetal mesoderm inducing centers during early Xenopus development.
- To understand how BMP influences dorsal and ventral mesoderm induction.
Main Methods:
- Utilized Xenopus laevis embryos and Nieuwkoop explants.
- Examined the effects of ectopic BMP-4 expression, BMP-2/4 dominant-negative receptor (DNR), Smad, and Mix.1 proteins in vegetal pole cells.
- Assessed mesoderm induction via recombination with animal cap ectoderm and LiCl treatment.
Main Results:
- Ectopic BMP-4 in vegetal pole cells inhibited dorsal mesoderm induction but enhanced ventral mesoderm induction.
- Expression of Smad or Mix.1 proteins in the vegetal pole also inhibited dorsal mesoderm induction.
- BMP-2/4 DNR expression in the vegetal pole increased dorsal mesoderm induction and inhibited ventral mesoderm induction.
Conclusions:
- BMP signaling plays a significant role in regulating both ventral vegetal and dorsal vegetal mesoderm induction center formation.
- These findings elucidate BMP's early regulatory function in establishing mesodermal patterning in Xenopus.