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Related Experiment Videos

David D Au1, Jenny C Liu1, Soo Jee Park1

  • 1Department of Physiology and Biophysics, School of Medicine, University of California, Irvine, Irvine, CA, United States.

Frontiers in Neuroscience
|June 5, 2023
PubMed
Summary

Fruit flies use multiple light sensors to wake up, demonstrating functional redundancy in their circadian neural circuit. This research investigates how different photoreceptor systems contribute to light-activated arousal behaviors.

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Area of Science:

  • Neuroscience
  • Chronobiology
  • Sensory Biology

Background:

  • Lateral ventral neurons (LNvs) in fruit flies regulate behaviors beyond clock resetting, such as light-activated arousal.
  • Converging sensory inputs can provide functional redundancy in neural circuits.
  • LNvs receive light input through three distinct pathways: cryptochrome (CRY), rhodopsin 7 (Rh7), and synaptic inputs.

Purpose of the Study:

  • To investigate the relative contributions of CRY, Rh7, and synaptic photoreceptor inputs to LNvs.
  • To determine the functional impact of these photoreceptor systems on photoelectrical and behavioral responses.
  • To understand how these systems confer functional redundancy in light-evoked arousal.

Main Methods:

  • Patch-clamp electrophysiology was used to measure light-evoked firing frequency (FF) in large LNvs (l-LNvs).
Keywords:
Drosophila melanogastercryptochromeelectrophysiologyexternal rhodopsininternal rhodopsin-7light arousal behaviornon-image forming visionphotoreceptor circuit

Related Experiment Videos

  • Mutant flies lacking specific photoreceptor inputs (gl60j, cry-null, rh7-null, gl60j-cry-null) were compared to controls.
  • Light-pulse arousal assays were conducted using various wavelengths (UV, violet, blue, red) and intensities during subjective nighttime.

    • Main Results:

    • Short-wavelength light (UV, violet, blue) evoked significantly attenuated FF responses in all photoreceptor mutants.
    • Red light evoked significantly attenuated FF responses only in the double mutant gl60j-cry-null.
    • Behavioral arousal responses to light were significantly attenuated in mutants compared to controls, mirroring electrophysiological findings.

    Conclusions:

    • The distinct LNv photoreceptor systems are integrated within the circadian neural circuit.
    • These integrated systems provide functional redundancy for light-evoked behavioral arousal.
    • Understanding these pathways is crucial for comprehending circadian rhythm regulation and sensory processing in flies.