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Negative-Valence Neurons in the Larval Zebrafish Pallium.

Colton D Smith1,2, Zhuowei Du1,3, William P Dempsey1

  • 1Department of Biological Sciences, Division of Molecular and Computational Biology, University of Southern California, Los Angeles, CA 90089.

Biorxiv : the Preprint Server for Biology
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Summary

Researchers identified a specific brain region in zebrafish, the rostrolateral dorsal pallium (Rl), that detects harmful stimuli. This finding highlights the conserved neural circuits for processing negative valence across species.

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Area of Science:

  • Neuroscience
  • Comparative Biology
  • Zebrafish Models

Background:

  • Organism survival relies on distinguishing harmful from beneficial sensory events.
  • Mammalian amygdala neurons process negative and positive valence signals.
  • The larval zebrafish pallium may contain homologs of mammalian amygdala, but its encoded signals are poorly understood.

Purpose of the Study:

  • To characterize the signals encoded by pallial neurons in larval zebrafish.
  • To identify potential homologs of mammalian valence coding circuits in teleosts.

Main Methods:

  • Utilized two-photon light-sheet microscopy to image pan-neuronal calcium dynamics (GCaMP6s) in 7-9-day-old zebrafish.
  • Presented a range of aversive stimuli, including infrared heat, electric shock, looming shadows, vibration, sound, and light transitions.
  • Recorded brain-wide calcium dynamics in response to these stimuli.

Main Results:

  • A distinct cluster of neurons in the rostrolateral dorsal pallium (Rl) responded strongly to highly noxious and fully looming stimuli, but not milder threats.
  • Neurons in the ventromedial pallium and habenula responded to all tested stimuli.
  • Rl neurons exhibit high tiam2a expression, enabling potential genetic access.

Conclusions:

  • Identified a dedicated negative valence processing locus in the teleost pallium (Rl).
  • Demonstrated evolutionary conservation of valence coding circuits between zebrafish and mammals.
  • Provides a foundation for further investigation into conserved neural mechanisms of threat detection.