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Updated: Jun 14, 2026
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In Vivo Optical Calcium Imaging of Learning-Induced Synaptic Plasticity in Drosophila melanogaster
Published on: October 8, 2019
Equilibrative nucleoside transporter 2 regulates associative learning and synaptic function in Drosophila.
David Knight1, Philip J Harvey, Konstantin G Iliadi
1Program in Developmental and Stem Cell Biology, The Hospital for Sick Children, Toronto, Ontario M5G 1L7, Canada.
Summary
Equilibrative nucleoside transporter 2 (ent2) is vital for Drosophila development and associative learning. Its absence causes synaptic transmission defects, potentially linked to adenosine receptor signaling.
Area of Science:
- Neuroscience
- Developmental Biology
- Molecular Biology
Background:
- Nucleoside transporters are crucial for cellular function.
- Equilibrative nucleoside transporter 2 (ent2) is conserved across species.
Purpose of the Study:
- To investigate the function of equilibrative nucleoside transporter 2 (ent2) in Drosophila.
- To determine the role of ent2 in development, learning, and synaptic transmission.
Main Methods:
- Generated null and hypomorphic ent2 mutant alleles in Drosophila.
- Utilized RNA interference to knock down ent2 expression in specific neural tissues.
- Examined synaptic transmission at the larval neuromuscular junction (NMJ).
- Assessed calcium influx and neurotransmitter release.
Main Results:
- Null ent2 mutants exhibit lethality during late larval/early pupal stages.
- Hypomorphic ent2 mutants show impaired associative learning.
- ent2 is required in the mushroom bodies and antennal lobes for normal function.
- ent2 mutants display elevated excitatory junction potentials and altered synaptic plasticity at the NMJ.
- Increased presynaptic calcium influx was observed in ent2 mutants.
- These synaptic defects were rescued by an adenosine receptor mutant allele.
Conclusions:
- ent2 is essential for Drosophila development and cognitive function.
- Synaptic transmission and associative learning deficits in ent2 mutants are linked to adenosine receptor signaling.
- This study establishes a novel role for ent2 in the Drosophila nervous system.
