Identification of genes regulating stimulus-dependent synaptic assembly in Drosophila using an automated synapse...

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Neural activity-dependent synaptic plasticity is vital for learning and memory.
• The molecular mechanisms of synaptic plasticity, particularly in presynaptic neurons, remain incompletely understood.
• Previous research in Drosophila photoreceptor R8 neurons demonstrated activity-dependent changes in presynaptic active zones, involving both disassembly and assembly.

Purpose of the Study:

• To identify genes regulating stimulus-dependent synaptic assembly in Drosophila.
• To explore the molecular basis of synaptic plasticity in presynaptic neurons.
• To develop and utilize an automated system for screening genes involved in synaptic assembly.

Main Methods:

• Performed RNA interference (RNAi) screening of 300 candidate genes in Drosophila R8 photoreceptor neurons.
• Utilized an automated synapse quantification system with custom image analysis software.
• Identified candidate genes by assessing presynaptic protein aggregation and directly quantifying synapse numbers using GFP-tagged markers.

Main Results:

• Narrowed down candidate genes to 27 in the initial screen.
• Identified the gene cirl as a key regulator of synaptic assembly.
• Proposed a novel model for stimulus-dependent synaptic assembly involving the interaction of cirl and its ligand, ten-a.

Conclusions:

• The study successfully identified genes involved in stimulus-dependent synaptic assembly.
• Demonstrated the utility of an automated synapse quantification system for studying synaptic plasticity.
• Provided new insights into the molecular mechanisms underlying synaptic assembly in Drosophila R8 photoreceptors.