A screen for genes regulating the wingless gradient in Drosophila embryos

Area of Science:

• Developmental Biology
• Genetics
• Molecular Biology

Background:

• The secreted Wingless (Wg) protein is crucial for Drosophila embryonic epidermis patterning.
• Wg distribution transitions from symmetric to asymmetric, regulated by Hedgehog (Hh).
• Misexpression of Wg in specific cells causes dominant phenotypes, indicating sensitivity to Wg distribution.

Purpose of the Study:

• To identify genes that regulate Wingless (Wg) protein distribution and transport in the Drosophila embryonic epidermis.
• To utilize a dominant genetic screen based on Wg misexpression phenotypes.

Main Methods:

• A genetic screen using a third chromosome deficiency collection in Drosophila.
• Secondary screening of mutants and smaller deficiencies to identify interacting genes.
• Confirmation of gene function through analysis of Wg distribution in mutant embryos.

Main Results:

• Identified three interacting genes: dally, notum, and brahma.
• Confirmed that dally, dally-like, and notum directly or indirectly affect Wg distribution.
• Demonstrated the utility of the Wg misexpression phenotype for screening genes involved in Wg transport.

Conclusions:

• The identified genes play significant roles in regulating Wingless protein distribution.
• The developed screening assay is effective for discovering genes involved in Wingless transport.
• This research provides a foundation for understanding Wg protein trafficking in development.