SCN1A Gene Mutations in Indian Children With Epilepsy: Single Center Experience

Area of Science:

• Genetics
• Neurology
• Molecular Biology

Background:

• Complex seizure disorders represent a significant diagnostic challenge.
• Genetic factors play a crucial role in the etiology of many epilepsy syndromes.
• The SCN1A gene is a known major contributor to various epilepsy types.

Purpose of the Study:

• To determine the prevalence of SCN1A gene mutations in patients with complex seizure disorders.
• To investigate the correlation between SCN1A gene variants and specific seizure phenotypes.
• To highlight the clinical significance of early SCN1A mutation detection.

Main Methods:

• A retrospective laboratory-based study was conducted on samples submitted for molecular diagnosis.
• Exome sequencing was employed to identify genetic variants.
• Phenotype-genotype correlation was performed for patients with identified SCN1A variants.

Main Results:

• A total of 364 samples were analyzed, with 54% from children under five years old.
• SCN1A mutations were identified in 50 samples (approximately 13.7%) from patients with complex seizure disorders.
• Forty-four distinct SCN1A variants were identified, commonly associated with Dravet syndrome and genetic epilepsy with febrile seizures.

Conclusions:

• SCN1A gene mutations are a common finding in complex seizure disorders, with a notable prevalence in Dravet syndrome.
• Early molecular diagnosis of SCN1A gene mutations is essential for guiding appropriate antiepileptic drug selection.
• Genetic identification facilitates targeted patient management and genetic counseling.