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Forgotten memory storage and retrieval in Drosophila.

Chih-Ming Wang1,2, Chun-Yuan Wu1, Chen-En Lin3

  • 1Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan, ROC.

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Summary

Forgotten memories in fruit flies can be retrieved by reactivating specific brain cells. This study identifies key cellular and molecular pathways in Drosophila that regulate memory formation and recall, offering insights into memory accessibility.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Animal Behavior

Background:

  • Forgetting renders stored memories inaccessible, hindering recall responses to natural cues.
  • Memory reactivation can restore accessibility, but underlying mechanisms are not fully understood.
  • Drosophila melanogaster serves as a model organism for investigating memory processes.

Purpose of the Study:

  • To elucidate the cellular and molecular mechanisms governing the formation and retrieval of forgotten memories in Drosophila.
  • To identify specific neuronal populations and molecular pathways involved in memory accessibility.
  • To investigate the role of protein synthesis in establishing long-lasting memory traces.

Main Methods:

  • One-trial aversive olfactory conditioning in Drosophila.
  • Analysis of memory retrieval after periods of inaccessibility.
  • Investigation of molecular pathways involving CREB and Orb.
  • Electrophysiological and genetic manipulation of identified neuronal circuits (KCαβ, PPL1-α3, MBON-α3).

Main Results:

  • One-trial aversive olfactory memory becomes inaccessible within hours but is retrievable via mild retraining.
  • Long-lasting memory (approx. 20 days) involves CREB in Kenyon cells alpha beta (KCαβ).
  • Transient memory (approx. 1 day) involves Orb in mushroom body neurosecretory cells alpha 3 (MBON-α3).
  • The PPL1-α3 circuit negatively regulates forgotten memory retrieval.
  • KCαβ, PPL1-α3, and MBON-α3 collaboratively regulate memory formation and retrieval.

Conclusions:

  • Memory inaccessibility is a dynamic process regulated by specific neuronal circuits and molecular factors.
  • Reactivation and retraining can overcome forgetting by modulating memory trace accessibility.
  • The interplay between KCαβ, PPL1-α3, and MBON-α3 is crucial for both memory formation and retrieval in Drosophila.