A 28-year-old man from Delhi presents with a 5-year history of brief, explosive nocturnal seizures characterized by bicycling movements, pelvic thrusting, and dystonic posturing lasting 20–40 seconds. Attacks cluster 3–4 times per night during sleep and are stereotyped (identical each time). His father and paternal grandfather had similar seizures. Interictal scalp EEG is normal. During video-EEG polysomnography, the pattern marked **A** in the diagram is captured during stage 2 NREM sleep. Which genetic abnormality is most likely responsible for this patient's condition?
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