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In vivo Visualization of Synaptic Vesicles Within Drosophila Larval Segmental Axons
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A conditional GABAergic synaptic vesicle marker for Drosophila.

Sarah J Certel1, Brian D McCabe2, R Steven Stowers3

  • 1Division of Biological Sciences, Center for Structural and Functional Neuroscience, The University of Montana, Missoula, MT, USA.

Journal of Neuroscience Methods
|February 27, 2022
PubMed
Summary

Researchers developed 9XV5-vGAT, a new tool to identify GABAergic neurons and their release sites. This marker helps understand brain function by visualizing GABAergic synaptic vesicles.

Keywords:
DrosophilaEpitope tagGABAergicSynaptic vesicleVGAT

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • GABA is the primary inhibitory neurotransmitter crucial for brain homeostasis.
  • Identifying GABAergic neurons and release sites is key to understanding neural circuit function.
  • This includes regulation of neuronal excitability, information processing, and synaptic plasticity.

Purpose of the Study:

  • To develop and characterize a novel conditional marker for GABAergic synaptic vesicles.
  • The marker, named 9XV5-vGAT, is designed for use in Drosophila.
  • This tool aims to facilitate the identification and study of GABAergic neurotransmission.

Main Methods:

  • Development of a conditional marker, 9XV5-vGAT, for GABAergic synaptic vesicles in Drosophila.
  • Validation of 9XV5-vGAT for conditional expression, synaptic vesicle localization, GABAergic neuron specificity, and functionality.
  • Application of 9XV5-vGAT in combination with other markers for neurotransmitter phenotyping.

Main Results:

  • 9XV5-vGAT was successfully validated for its intended properties.
  • Its utility was demonstrated in identifying GABAergic neurons and release sites in the Drosophila central complex.
  • Combined use with other markers enabled fast neurotransmitter phenotyping of specific neurons.

Conclusions:

  • A validated conditional marker for GABAergic synaptic vesicles (9XV5-vGAT) has been established.
  • This marker enables GABA neurotransmitter phenotyping and localization of GABAergic synaptic vesicles.
  • The method offers an alternative to single-cell transcriptomics for neurotransmitter identification.