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Updated: May 12, 2025

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A highly conserved neuronal microexon in DAAM1 controls actin dynamics, RHOA/ROCK signaling, and memory formation.

Patryk Poliński1, Marta Miret Cuesta2, Alfonsa Zamora-Moratalla2

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A neuronal microexon in DAAM1 regulates actin dynamics, crucial for nervous system development. Its deletion impairs neurite outgrowth, synaptic plasticity, and memory, highlighting microexon importance in cognitive function.

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Area of Science:

  • Neurobiology
  • Molecular Biology
  • Cell Biology

Background:

  • Actin cytoskeleton dynamics are vital for nervous system development and function.
  • Neuronal-specific microexons are conserved but their role in actin regulation remains unclear.

Purpose of the Study:

  • To investigate the function of a specific microexon in the DAAM1 gene, a key regulator of actin reorganization.
  • To determine the impact of this microexon on neuronal development, actin dynamics, and cognitive functions.

Main Methods:

  • Studied a microexon in the DAAM1 gene, focusing on its effect on the FH2 domain and actin polymerization.
  • Generated and analyzed mice with genomic deletion of the microexon.
  • Assessed neuritogenesis, calcium influx, postsynaptic structures, long-term potentiation, and memory formation.
  • Investigated RHOA/ROCK signaling pathways and the effect of ROCK inhibitor treatment.

Main Results:

  • Microexon inclusion in DAAM1 alters actin polymerization by extending the FH2 domain linker.
  • Genomic deletion of the microexon caused neuritogenesis defects and increased calcium influx in neurons.
  • Mice lacking the microexon showed postsynaptic defects, reduced immature dendritic spines, impaired long-term potentiation, and memory deficits.
  • Phenotypes were linked to increased RHOA/ROCK signaling and partially rescued by ROCK inhibition.

Conclusions:

  • A conserved neuronal microexon in DAAM1 plays a critical role in regulating actin dynamics.
  • This microexon is essential for proper neurite outgrowth, synaptic plasticity, and cognitive functions, including memory formation.
  • Dysregulation of this microexon impacts neuronal signaling pathways and can be targeted for therapeutic intervention.