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Related Experiment Video

Updated: Jul 2, 2025

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

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DNA G-Quadruplex Is a Transcriptional Control Device That Regulates Memory.

Paul R Marshall1,2, Joshua Davies3, Qiongyi Zhao3

  • 1Cognitive Neuroepigenetics Laboratory, The Queensland Brain Institute, University of Queensland, Brisbane, QLD 4072, Australia paul.marshall@anu.edu.au t.bredy@uq.edu.au.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 28, 2024
PubMed
Summary
This summary is machine-generated.

G-quadruplex DNA (G4-DNA) accumulates in neurons with experience, regulating genes essential for learning and memory. Resolving G4-DNA disrupts fear extinction memory, highlighting its role in memory consolidation.

Keywords:
DNAgene expressionmemory

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • DNA conformation influences gene transcription and RNA levels.
  • Dynamic DNA structures are implicated in cellular processes.

Purpose of the Study:

  • To investigate the role of G-quadruplex DNA (G4-DNA) in neuronal function and memory.
  • To determine if G4-DNA accumulation in neurons is experience-dependent.
  • To assess the impact of G4-DNA resolution on fear extinction memory.

Main Methods:

  • Studied G4-DNA accumulation in neurons of male C57/BL6 mice.
  • Utilized dCas9-mediated deposition of the helicase DHX36 for site-specific G4-DNA resolution.
  • Assessed the effects on gene expression related to learning and memory.
  • Evaluated fear extinction memory performance.

Main Results:

  • G-quadruplex DNA (G4-DNA) accumulates in neurons in an experience-dependent manner.
  • G4-DNA is required for transient gene silencing and activation critical for learning and memory.
  • Site-specific resolution of G4-DNA impairs fear extinction memory.

Conclusions:

  • Dynamic DNA structural states, specifically G4-DNA, are a key molecular mechanism for memory consolidation.
  • G4-DNA acts as a molecular switch for temporal gene expression regulation in memory formation.
  • Experience-dependent G4-DNA accumulation in neurons plays a crucial role in learning and memory processes.