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Complementary and combinatorial patterns of Notch gene family expression during early mouse development
R Williams1, U Lendahl, M Lardelli
1Department of Cell and Molecular Biology, Medical Nobel Institute, Karolinska Institute, Stockholm, Sweden.
Mechanisms of Development
|November 1, 1995
Summary
Mammalian Notch 1, 2, and 3 genes are dynamically expressed during early mouse development, particularly in gastrulation and nervous system formation. Their complex patterns suggest roles in cell fate, adhesion, and axonal pathfinding.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- The Drosophila Notch gene is a transmembrane receptor crucial for cell fate regulation, lateral specification, and axonal pathfinding.
- Understanding mammalian Notch homologues' roles is vital for deciphering early developmental processes.
Purpose of the Study:
- To analyze the expression patterns of the three mammalian Notch homologues (Notch 1, 2, and 3) during early mouse development.
- To investigate the potential roles of these genes in gastrulation, somitogenesis, and nervous system formation.
Main Methods:
- In situ hybridization was employed to visualize the spatial and temporal expression of Notch 1, 2, and 3 genes in mouse embryos.
- Expression patterns were analyzed during key developmental stages, including gastrulation and somitogenesis.
Main Results:
- Notch genes exhibit dynamic and complex expression patterns throughout early mouse embryogenesis.
- Distinct, non-overlapping expression patterns were observed during gastrulation, with Notch 3 in ectoderm/mesoderm, Notch 2 in the node/notochord/neural groove, and Notch 1 in presomitic mesoderm.
- Differential Notch gene expression defines neural crest and placode cell populations, and Notch 1 expression in migrating cells suggests a role in axonal pathfinding, analogous to Drosophila.
Conclusions:
- Mammalian Notch 1, 2, and 3 genes play critical, temporally and spatially regulated roles in early mouse development.
- Their complex expression patterns during gastrulation, somitogenesis, and neurogenesis highlight their involvement in cell fate determination, differentiation, and potentially axonal guidance.