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Somitogenesis controlled by Noggin
1Department of Bioscience, Kitasato University, Kitasato, Sagamihara, 228, Japan.
Developmental Biology
|October 14, 1998
Summary
Noggin, a BMP-4 antagonist, specifies somites in vertebrate embryos. Low BMP-4 activity directs somite formation, while higher levels from the lateral plate establish mediolateral polarity.
Area of Science:
- Developmental biology
- Molecular biology
- Embryology
Background:
- Vertebrate axial bones and skeletal muscles originate from segmented somites within the paraxial mesoderm.
- Somite formation is distinguished from lateral plate mesoderm by differential Bone Morphogenetic Protein 4 (BMP-4) activity levels.
- BMP-4 activity is notably higher in the lateral plate compared to the presumptive somite.
Purpose of the Study:
- To investigate the role of Noggin in specifying somite identity from paraxial mesoderm.
- To elucidate the mechanism by which BMP-4 levels and Noggin influence mesoderm differentiation.
- To understand how mediolateral (M-L) polarity is established within somites.
Main Methods:
- Analysis of Noggin expression in presumptive somites.
- Experimental manipulation involving implantation of Noggin-producing cells into the presumptive lateral plate.
- Observation of somite formation and M-L polarity acquisition in response to altered Noggin levels.
Main Results:
- Noggin, an antagonist of BMP-4, is expressed in the presumptive somite, regulating BMP-4 levels.
- Implantation of Noggin-producing cells into the lateral plate induced ectopic somite formation from lateral plate precursors.
- Ectopic somites initially lacked M-L polarity, which was acquired upon removal of the implanted Noggin.
Conclusions:
- Low BMP-4 activity, maintained by Noggin, specifies somites in the medial paraxial mesoderm.
- Subsequent BMP-4 signaling from the lateral plate is crucial for establishing M-L polarity in developing somites.
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