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DEPDC5 gene mutations cause focal epilepsy. A zebrafish model showed that reducing Depdc5 causes hyperactivity, which rapamycin (an mTORC1 inhibitor) or normal DEPDC5 could fix, highlighting a therapeutic target.

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Area of Science:

  • Neurogenetics
  • Developmental Neuroscience
  • Molecular Biology

Background:

  • DEPDC5 mutations are a significant genetic cause of focal epilepsy, often linked to cortical malformations.
  • DEPDC5, a component of the GATOR1 complex, negatively regulates mTOR signaling, and its haploinsufficiency is implicated in epilepsy etiology.

Purpose of the Study:

  • To establish and characterize a zebrafish model for DEPDC5-related focal epilepsy.
  • To investigate the role of DEPDC5 in neuronal development and activity using a vertebrate model.

Main Methods:

  • Defined depdc5 expression patterns during zebrafish development.
  • Created a zebrafish model with reduced Depdc5 expression to study epilepsy-related phenotypes.
  • Utilized behavioral analysis, neuronal activity assessment, and genetic manipulation (transcription overexpression and drug treatment).

Main Results:

  • The zebrafish model exhibited hyperactivity, circular swimming, and increased neuronal activity, consistent with epilepsy.
  • Phenotypic features were ameliorated by treatment with the mTORC1 inhibitor rapamycin and by overexpressing wild-type human DEPDC5.
  • Epilepsy-associated DEPDC5 mutations failed to rescue the phenotype, confirming their loss-of-function nature.

Conclusions:

  • Depdc5 knockdown in zebrafish results in early-onset motor and neuronal hyperactivity.
  • The findings confirm DEPDC5's role in mTORC1 signaling pathways.
  • The mTORC1 pathway represents a potential therapeutic target for DEPDC5-inherited focal epilepsies.