UNC13B variants associated with partial epilepsy with favourable outcome.

Area of Science:

• Neuroscience
• Genetics
• Molecular Biology

Background:

• The UNC13B gene encodes Munc13-2, a presynaptic protein crucial for synaptic vesicle function and neuronal excitability.
• The role of UNC13B mutations in human diseases, particularly epilepsy, remains largely unexplored.

Purpose of the Study:

• To investigate the potential association between UNC13B gene variants and partial epilepsy.
• To identify and characterize novel UNC13B mutations in a cohort of epilepsy patients.

Main Methods:

• Trio-based whole-exome sequencing was performed on 446 unrelated families with partial epilepsy.
• Identified UNC13B variants were analyzed computationally and functionally in Drosophila models.
• Variant frequencies were compared between patient and control cohorts (Han Chinese, East Asian, gnomAD).

Main Results:

• UNC13B variants were found in 12 individuals from eight families with partial epilepsy and/or febrile seizures.
• Computational modeling and Drosophila studies indicated that the identified variants impair UNC13B function.
• UNC13B variant frequency was significantly higher in epilepsy patients compared to control populations.

Conclusions:

• UNC13B is potentially associated with the development of partial epilepsy.
• UNC13B-related epilepsy presents with focal seizures and potential hippocampal abnormalities but shows a favorable outcome with treatment.
• This study highlights UNC13B as a novel genetic factor in epilepsy.