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Ectopic HCN4 expression drives mTOR-dependent epilepsy in mice.

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Abnormal expression of hyperpolarization-activated cyclic nucleotide-gated potassium channel 4 (HCN4) in focal cortical malformations (FCMs) drives epilepsy. Blocking HCN4 channels in FCM neurons prevented seizures in a mouse model, suggesting a potential gene therapy target.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Epileptology

Background:

  • Focal cortical malformations (FCMs) are linked to epilepsy, particularly in focal cortical dysplasia type II (FCDII) and tuberous sclerosis complex (TSC).
  • The precise mechanisms driving seizures in these conditions are not fully understood.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying seizures in FCMs associated with TSC and FCDII.
  • To identify potential therapeutic targets for epilepsy in these conditions.

Main Methods:

  • Utilized a mouse model of TSC- and FCDII-associated FCM.
  • Examined the expression and function of hyperpolarization-activated cyclic nucleotide-gated potassium channel 4 (HCN4).
  • Investigated the role of mechanistic target of rapamycin (mTOR) and cyclic adenosine monophosphate (cAMP) signaling.

Main Results:

  • FCM neurons exhibited abnormal HCN4 expression, which was dependent on mTOR and preceded seizure onset.
  • Increased intracellular cAMP levels promoted repetitive firing in FCM neurons via HCN4.
  • HCN4 expression was also observed in patient-derived tissue from TSC and FCDII.
  • Blocking HCN4 channel activity in FCM neurons prevented epilepsy in the mouse model.

Conclusions:

  • HCN4 plays a critical role in seizure generation in TSC and FCDII.
  • A cAMP-dependent mechanism involving HCN4 contributes to epilepsy in these conditions.
  • Targeting HCN4, particularly through gene therapy, shows promise for treating seizures in FCDII and TSC.