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A function for Egf receptor signaling in expanding the developing brain in Drosophila
1MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, United Kingdom. paged@mrc-lmb.cam.ac.uk
Current Biology : CB
|March 21, 2003
Summary
The insect foregut, not neural midline cells, signals to pattern the developing brain. This signaling is crucial for brain cell growth and development, suggesting an evolutionary role for the foregut in brain patterning.
Area of Science:
- Neuroscience
- Developmental Biology
- Insect Brain Development
Background:
- Neural midline cells pattern the central nervous system (CNS) in many animals.
- The developing insect brain, responsible for olfaction and feeding, is located lateral to the foregut and lacks midline neural cells.
Purpose of the Study:
- To investigate if the foregut can substitute for neural midline cells in patterning the adjacent insect brain.
- To determine the signaling mechanisms involved in patterning the brain region lateral to the foregut.
Main Methods:
- Examined expression of the neural midline marker Single-minded and Egf receptor signaling pathway components in Drosophila embryos.
- Utilized genetic manipulation to remove the function of key signaling molecules.
Main Results:
- Single-minded and Egf receptor pathway components were found in foregut cells adjacent to the brain.
- Loss of function in these molecules led to abnormal brain cell proliferation and reduced brain size.
Conclusions:
- The brain region lateral to the foregut receives an Egf signal from the foregut, promoting cell proliferation.
- The foregut may act as a signaling center for this brain region, potentially representing an evolutionarily recent addition to the arthropod brain.