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Two Parallel Pathways Assign Opposing Odor Valences during Drosophila Memory Formation.

Daisuke Yamazaki1, Makoto Hiroi1, Takashi Abe1

  • 1Institute of Molecular and Cellular Biosciences, University of Tokyo, Yayoi 1-1-1, Tokyo 113-0032, Japan.

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|March 1, 2018
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Summary

Fruit flies learn odor preferences through specific brain cells. Two neuron types, γCRE-p and γCRE-n, encode negative and positive values, respectively, influencing odor-guided behavior and memory.

Keywords:
DrosophilaMBON-γ2α′1MBON-γ5β′2a/β′2mpmutual inhibitionolfactory memoryvalencesγCRE-n neuronsγCRE-p neurons

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Area of Science:

  • Neuroscience
  • Olfactory Learning
  • Drosophila melanogaster research

Background:

  • Olfactory associative learning in Drosophila involves mushroom body (MB) neurons and dopaminergic modulation.
  • The precise neural mechanisms for encoding valence (positive/negative) in olfactory learning are not fully understood.

Purpose of the Study:

  • To identify intrinsic MB neuron classes that encode valence information during olfactory associative learning.
  • To elucidate how valence information is processed and integrated within the MB circuitry to influence behavior.

Main Methods:

  • Utilized cAMP response element (CRE)-dependent expression to distinguish and characterize intrinsic MB γ neuron classes.
  • Investigated the roles of identified neuron classes (γCRE-p and γCRE-n) and specific MB output neurons (MBONs) in modulating odor preferences.
  • Manipulated the activity of these neuron types to observe effects on behavioral responses to odors.

Main Results:

  • Identified two distinct intrinsic MB γ neuron classes, γCRE-p and γCRE-n, which encode aversive and appetitive valences, respectively.
  • Demonstrated that these neuron classes act antagonistically to maintain neutral odor valence, and their activation or inhibition shifts odor preferences.
  • Showed that specific MBONs (MBON-γ5β'2a/β'2mp and MBON-γ2α'1) mediate the valence-encoding functions of γCRE-p and γCRE-n neurons.

Conclusions:

  • MB neurons encode both odor identity and valence information.
  • Valence information is integrated within the MBONs, which are crucial for regulating olfactory learning and memory.
  • This study reveals a novel circuit mechanism for valence encoding in associative learning.