GABRB3 and epilepsy syndrome: We aimed to delineate the clinical trajectories associated with gain-of-function (GoF) and loss-of-function (LoF) variants in GABRB2 and GABRB3, and to develop a risk-prediction model for gross motor dysfunction based on age at seizure onset.<h4>Methods</h4>Clinical data, including seizure onset, epilepsy syndromes, cognitive outcomes, and gross motor function classification system (GMFCS), were collected through direct interviews, physician reports, and literature review.