An ELISA-based method for rapid genetic screens in Drosophila

Area of Science:

• Developmental Biology
• Genetics
• Neuroscience

Background:

• Genetic screens in Drosophila are powerful but limited by assay speed and scope.
• Drosophila possess extensive GFP-based tools for visualizing cellular and molecular pathways.
• A rapid, quantitative assay for GFP levels in Drosophila tissue is needed for broad screening.

Purpose of the Study:

• To develop a GFP-based enzyme-linked immunosorbent assay (ELISA) for rapid and quantitative screening in Drosophila.
• To validate the assay's ability to detect GFP in various tissues, cell types, and developmental stages.
• To demonstrate the assay's utility in identifying genes affecting cell morphology, transcriptional activity, and synaptic remodeling.

Main Methods:

• Developed a GFP-based ELISA for Drosophila lysates.
• Tested detection of membrane-localized GFP in neuronal and glial populations.
• Validated assay performance with endogenously tagged proteins (Draper, Cryptochrome, Brp).
• Assessed detection of changes during synaptic remodeling and identified genetic regulators of glial engulfment.

Main Results:

• The GFP-ELISA successfully detects GFP in whole animals and dissected tissues across all Drosophila developmental stages.
• The assay identifies genes altering cell morphology and STAT/JNK transcriptional activity.
• It detects endogenous GFP-tagged proteins and changes in synaptic marker Brp during development.
• A small-scale screen identified Syntaxins as potential regulators of astrocyte-mediated synapse elimination.

Conclusions:

• The GFP-based ELISA is a rapid, easy, and quantitative in vivo screening method for Drosophila.
• This assay provides a broadly applicable platform for investigating diverse biological questions.
• It facilitates the study of fundamental processes including cell morphology, transcriptional regulation, and synaptic plasticity.