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Drosophila wingless: a paradigm for the function and mechanism of Wnt signaling
1Department of Genetics, Harvard Medical School, Boston, MA 02115.
Abstract:
The link between oncogenesis and normal development is well illustrated by the study of the Wnt family of proteins. The first Wnt gene (int-1) was identified over a decade ago as a proto-oncogene, activated in response to proviral insertion of a mouse mammary tumor virus. Subsequently, the discovery that Drosophila wingless, a developmentally important gene, is homologous to int-1 supported the notion that int-1 may have a role in normal development. In the last few years it has been recognized that int-1 and Wingless belong to a large family of related glyco-proteins found in vertebrates and invertebrates. In recognition of this, members of this family have been renamed Wnts, an amalgam of int and Wingless. Investigation of Wnt genes in Xenopus and mouse indicates that Wnts have a role in cell proliferation, differentiation and body axis formation. Further analysis in Drosophila has revealed that Wingless function is required in several developmental processes in the embryo and imaginal discs. In addition, a genetic approach has identified some of the molecules required for the transmission and reception of the Wingless signal. We will review recent data which have contributed to our growing understanding of the function and mechanism of Drosophila Wingless signaling in cell fate determination, growth and specification of pattern.
Insights
The Wnt protein family, initially identified as oncogenes, plays a crucial role in normal development. Research in Drosophila reveals Wingless signaling is vital for cell fate, growth, and pattern formation.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- The Wnt protein family, including the initially identified int-1 proto-oncogene, links oncogenesis and normal development.
- Homology between Drosophila wingless and int-1 suggests a role for Wnt proteins in developmental processes.
- Wnt proteins are a large family of glycoproteins conserved across vertebrates and invertebrates.
Purpose of the Study:
- To review recent data on the function and mechanism of Drosophila Wingless signaling.
- To elucidate the role of Wnt signaling in cell fate determination, growth, and pattern specification.
- To understand the molecules involved in Wingless signal transmission and reception.
Main Methods:
- Genetic approaches in Drosophila to identify components of the Wingless signaling pathway.
- Comparative analysis of Wnt gene function in Xenopus and mouse models.
- Review of existing literature on Wnt protein family and signaling pathways.
Main Results:
- Wnt genes are essential for cell proliferation, differentiation, and body axis formation in Xenopus and mouse.
- Drosophila Wingless signaling is required for multiple embryonic and imaginal disc developmental processes.
- Key molecules mediating Wingless signal transmission and reception have been identified.
Conclusions:
- Wnt proteins are fundamental regulators of both normal development and oncogenesis.
- Drosophila Wingless signaling provides a model system for understanding conserved developmental mechanisms.
- Further research into Wnt signaling pathways is crucial for understanding cell fate and pattern formation.