A full-term male neonate is noted to have seizures on day 2 of life. His mother had an uncomplicated pregnancy and delivery. The seizures consist of focal clonic jerks and episodes of apnea. The interictal EEG is normal, and the infant is well between seizures. The father and a paternal uncle both had similar seizures as infants that resolved spontaneously. What is the most likely genetic basis for this infant’s condition?