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Comparative experience shapes sucrose preference through memory in Drosophila.

Maximiliano Martinez-Cordera1,2, Takaomi Sakai2, Minoru Saitoe1

  • 1Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 1568506, Japan.

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Fruit flies learn to prefer higher sugar concentrations through memory. Prior experience with food options enhances this preference, involving specific genes and brain regions for optimal foraging.

Keywords:
Dopamine signalingDrosophila melanogasterFeeding behaviorMushroom bodySucrose preference

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Genetics

Background:

  • Optimal foraging is crucial for animal survival.
  • Neural mechanisms underlying food selection are not fully understood.
  • Drosophila melanogaster serves as a model organism for studying feeding behavior.

Purpose of the Study:

  • To investigate the link between memory and feeding behavior in fruit flies.
  • To understand how prior experience influences food choice.
  • To identify neural components involved in memory-based food selection.

Main Methods:

  • Flies were presented with two sucrose solutions (150 mM and 100 mM).
  • Food preference was measured under different densities of food availability (60 wells vs. 8 wells).
  • Genetic manipulation and analysis of memory-related genes (rut) and dopamine receptors in the mushroom body were performed.

Main Results:

  • Flies showed a preference for 150 mM sucrose when food was abundant.
  • This preference diminished with limited food availability (8 wells).
  • Prior exposure to abundant food enhanced preference for 150 mM sucrose, even with limited food.
  • The memory gene rut and dopamine D1 receptor in the mushroom body were essential for this enhanced preference.

Conclusions:

  • Memory acquisition through experiencing different food options optimizes foraging decisions in fruit flies.
  • The mushroom body acts as a site for storing this memory.
  • Specific genes and neural pathways are critical for memory-dependent food selection.