A versatile method for cell-specific profiling of translated mRNAs in Drosophila

Area of Science:

• Molecular Biology
• Genetics
• Developmental Biology

Background:

• Limited methods exist for rapid cell-type or tissue-specific expression profiling in Drosophila melanogaster.
• Translating ribosome affinity purification (TRAP) profiles actively translated mRNAs but has been limited in scope in other organisms.

Purpose of the Study:

• To adapt the TRAP method for Drosophila using the GAL4/UAS system for versatile cell-type specific translatome profiling.
• To create transgenic Drosophila expressing GFP-tagged ribosomal protein RpL10A for polysome affinity purification.

Main Methods:

• Developed a TRAP method for Drosophila by creating transgenic strains expressing UAS-driven GFP::RpL10A.
• Utilized GAL4/UAS system for targeted expression of GFP::RpL10A in specific cell types.
• Performed polysome affinity purification to isolate actively translated mRNAs.

Main Results:

• The GFP::RpL10A fusion protein efficiently incorporated into ribosomes and polysomes.
• Polysome affinity purification strongly enriched mRNAs from targeted tissues.
• Achieved sufficient sensitivity to analyze gene expression in small cell populations.

Conclusions:

• The adapted TRAP method enables cell-type specific translatome profiling in Drosophila melanogaster.
• This technique allows for the analysis of unique translatome profiles across diverse cell types and conditions.
• Facilitates comprehensive gene expression studies in nearly any tissue with a single genetic cross.