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The embryonic development of the Drosophila visual system
P Green1, A Y Hartenstein, V Hartenstein
1Department of Biology, University of California Los Angeles 90024.
Cell and Tissue Research
|September 1, 1993
Summary
Notch signaling is crucial for developing the Drosophila visual system, controlling cell numbers in Bolwig's organ and maintaining optic lobe structure during embryogenesis.
Area of Science:
- Developmental Biology
- Neuroscience
- Genetics
Background:
- The Drosophila larval visual system comprises the optic lobe and Bolwig's organ.
- These structures develop through embryonic invagination from the posterior procephalic region.
- Understanding their development and the role of signaling pathways is key.
Purpose of the Study:
- To characterize the development of the Drosophila larval photoreceptor (Bolwig's) organ and optic lobe.
- To investigate the role of Notch signaling in the development of both structures.
Main Methods:
- Electron microscopy
- Bromodeoxyuridine (BrdU) incorporation and antibody labeling
- Analysis of Notch pathway involvement
Main Results:
- Bolwig's organ and the optic lobe invaginate from the same embryonic region.
- Bolwig's organ cells remain in the head epidermis and develop unique branched processes, not rhabdomeres.
- Notch signaling regulates the number of cells in Bolwig's organ and maintains optic lobe epithelial integrity.
Conclusions:
- Notch is essential for delimiting Bolwig's organ cell number.
- Notch is required for maintaining the epithelial character of optic lobe cells during and after invagination.
- This study elucidates critical roles of Notch in early visual system development.