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A kinase-dependent feedforward loop affects CREBB stability and long term memory formation.

Pei-Tseng Lee1, Guang Lin1, Wen-Wen Lin1

  • 1Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, United States.

Elife
|February 24, 2018
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Summary
This summary is machine-generated.

A newly discovered kinase, Meng-Po (MP), is crucial for long-term memory (LTM) in Drosophila. MP acts with PKA in a feedforward loop to regulate CREB levels and consolidate memories in mushroom bodies.

Keywords:
D. melanogasterDrosophilaMiMICSBK1T2A-GAL4deGradFPmushroom bodiesneuroscience

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Long-term memory (LTM) in Drosophila is dependent on the transcription factor CREB, regulated by PKA phosphorylation.
  • Identifying additional kinases involved in memory formation is essential for understanding LTM mechanisms.

Purpose of the Study:

  • To identify novel kinases required for memory formation in Drosophila mushroom bodies.
  • To elucidate the role of the identified kinase in regulating CREB and LTM.

Main Methods:

  • Utilized Trojan exons and T2A-GAL4 system for targeted gene integration in Drosophila.
  • Screened kinase genes expressed in mushroom bodies for learning and memory deficits using UAS-RNAi.
  • Employed deGradFP for protein knockdown and reintroduction experiments in adult flies.

Main Results:

  • Identified Meng-Po (MP), a conserved kinase (human ortholog SBK1), essential for 3-hour and 24-hour LTM but not learning.
  • MP protein removal in adult mushroom bodies abolished memory, while reintroduction restored it.
  • MP acts as a limiting factor for LTM, with overexpression enhancing memory in wild-type flies.
  • PKA phosphorylates MP, and they synergize in a feedforward loop to control CREB levels and LTM.

Conclusions:

  • Meng-Po (MP) is a novel, critical kinase for Drosophila long-term memory consolidation.
  • MP functions in a PKA-mediated feedforward loop to regulate CREB and LTM in mushroom bodies.
  • MP is a key regulator of LTM, with potential implications for understanding memory mechanisms in other species.