Related Experiment Video
Updated: Jun 12, 2026
07:49
Preparation of Adult Drosophila Eyes for Thin Sectioning and Microscopic Analysis
Published on: August 27, 2011
Comparative analysis of Wingless patterning in the embryonic grasshopper eye
1Department of Biological Sciences, Wayne State University, 5047 Gullen Mall, Detroit, MI 48202, USA.
Development Genes and Evolution
|March 5, 2005
Summary
Wingless (wg) signaling in grasshoppers shows conserved roles in early eye development, regulating axis formation and proliferation. However, key Drosophila signaling pathways appear divergent in primitive insect eye development.
Area of Science:
- Developmental Biology
- Evolutionary Developmental Biology
- Entomology
Background:
- Wingless (wg) signaling is crucial for Drosophila eye development.
- Understanding conserved mechanisms in primitive insects is key to evolutionary insights.
- The molecular regulation of embryonic eye development in primitive insects remains largely uncharacterized.
Purpose of the Study:
- To investigate the expression of wingless (wg) and interacting genes during embryonic eye development in the grasshopper Schistocerca americana.
- To compare these findings with Drosophila to infer conserved and divergent roles in eye development.
- To gain insight into the molecular control of eye primordium formation in primitive insects.
Main Methods:
- Studied the expression patterns of wg and its interacting genes in the grasshopper embryo.
- Utilized comparative analysis with known Drosophila eye development genes.
- Performed in vitro culture of grasshopper eye primordia with LiCl to test for retina differentiation inhibition.
Main Results:
- Identified three paired wg expression domains in the grasshopper procephalon relevant to eye development.
- Observed conserved functions of wg in axis formation and proliferation, supported by expression of sine oculis and eyes absent orthologs and LiCl treatment.
- Found divergence from Drosophila in Notch signaling pathway involvement and head epidermis specification, with Extradenticle (Exd) expression being restricted.
Conclusions:
- Wingless signaling plays a conserved role in early eye primordium development, influencing axis formation and proliferation.
- Significant evolutionary divergence exists in the molecular mechanisms controlling eye development between primitive insects and Drosophila.
- The study provides the first molecular insights into grasshopper embryonic eye development, highlighting modifications in the evolution of Drosophila-like eye development.
