Home › Cell Biology › Optogenetic Perturbation of Neural Activity with Laser Illumination in Semi-intact Drosophila Larvae in Motion
Cell Biology JoVE (Open Access) Citable · DOI

Optogenetic Perturbation of Neural Activity with Laser Illumination in Semi-intact Drosophila Larvae in Motion

DOI: 10.3791/50513-v
What you'll learn
  • ✓ Prepare semi-intact Drosophila larvae for optogenetic manipulation
  • ✓ Configure confocal microscope for laser-based neural stimulation
  • ✓ Monitor motor output changes during optogenetic perturbation
  • ✓ Interpret neural circuit dynamics from muscle contraction data
Protocol

Here we describe a protocol for optogenetic manipulation of motoneuronal activity while monitoring changes in motor output (muscle contraction) in semi-intact Drosophila larvae using lasers within a conventional confocal microscope. This technique enables researchers to achieve local perturbation of neural activity in a few neuromeres to elucidate the dynamics of motor circuits.

Difficulty
advanced
Total time
~2–3 hours per larva (dissection, setup, imaging, analysis)
Model organism
Drosophila melanogaster larvae
Biosafety
BSL-1

Steps

1
Understand optogenetic perturbation in motor circuits

Review the rationale for using laser-based optogenetic stimulation to perturb motoneuronal activity and elucidate local motor circuit dynamics in semi-intact larval preparations.

▶ 00:53
2
Prepare larvae for semi-intact dissection

Select and mount Drosophila larvae appropriately to enable access to the nervous system while preserving neuromuscular connectivity and ability to monitor motor output.

▶ 01:41
3
Configure confocal microscope for optogenetics

Set up laser illumination and imaging optics on a conventional confocal microscope to enable targeted optogenetic stimulation within specific neuromeres.

▶ 02:46
4
Dissect semi-intact larval preparation

Carefully remove dorsal cuticle and expose the ventral nerve cord while maintaining muscle attachments to enable simultaneous neural stimulation and motor output recording.

▶ 03:02
5
Apply laser illumination and record muscle responses

Deliver localized laser stimulation to targeted neuromeres and simultaneously image muscle contractions to correlate neural activity perturbation with motor circuit output.

▶ 04:21
6
Analyze representative optogenetic results

Interpret imaging data showing the relationship between laser-induced neural perturbation and evoked muscle contraction patterns across multiple trials.

▶ 05:26
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