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Next-generation sequencing (NGS) has made genetic testing of patients with epileptic encephalopathies easier – novel variants are discovered and new phenotypes described. Variants in the same gene – even the same variant – can cause different types of epilepsy and neurodevelopmental disorders. Our aim was to identify the genetic causes of epileptic encephalopathies in paediatric patients with complex phenotypes.

NGS was carried out for three patients with epileptic encephalopathies. Detailed clinical features, brain magnetic resonance imaging and electroencephalography were analysed. We searched the Human Gene Mutation Database for the published GABRG2 variants with clinical description of patients and composed a summary of the variants and their phenotypic features.

We identified two novel de novo GABRG2 variants, p.P282T and p.S306F, with new phenotypes …