目的:总结n DNM1基因变异相关发育性癫痫性脑病患儿的基因型及临床表型特点。n 方法:回顾性收集2017年6月至2021年10月北京大学第一医院儿科门诊就诊的15例n DNM1基因变异相关癫痫患儿资料，分析其基因变异及临床特点。n 结果:15例患儿中，男8例，女7例；癫痫起病年龄为15 d~22月龄，中位起病年龄为8月龄。15例n DNM1基因变异均为新生杂合变异，其中错义变异13例、移码变异1例、无义变异1例，8例变异位点为尚未报道的新变异。癫痫发作类型包括：痉挛发作15例、局灶性发作9例、不典型失神发作2例、强直发作2例。7例患儿有多种发作类型，9例首次发作为痉挛发作。15例均有发育落后，其中11例在出现癫痫发作前即有发育落后。脑电图背景节律减慢3例，发作间期显示高度失律13例；8例监测到临床发作，其中痉挛发作7例，强直发作1例。头颅磁共振检查示额颞区蛛网膜下腔增宽6例、大脑皮质萎缩2例、胼胝体发育不良3例。15例均诊断为发育性癫痫性脑病，其中13例符合婴儿痉挛症。末次随访年龄1~7岁，予多种抗癫痫药物联合治疗后，2例发作缓解，1例(同卵双胎之小)2岁时因重症肺炎死亡，12例仍有间断发作，其中1例由婴儿痉挛症转型为Lennox-Gastaut综合征。n 结论:DNM1基因变异相关发育性癫痫性脑病多在婴儿期起病，高峰起病年龄为8月龄。癫痫发作类型主要为痉挛发作和局灶性发作，发育落后可出现在癫痫发作之前。临床多表现为婴儿痉挛症，少数患儿可转型为Lennox-Gastaut综合征。n “,”Objective:To summarize the clinical features of developmental epileptic encephalopathy children with n DNM1 gene variants.n Methods:The genotypes and clinical features of 15 children with n DNM1 variants related epilepsy in the Department of Pediatrics, Peking University First Hospital from June 2017 to October 2021 were retrospectively analyzed.n Results:A total of 8 male and 7 female epilepsy patients with n DNM1 gene variants with the age of seizure onset ranging from 15 days to 22 months were recruited, median age was 8 months.All cases belonged to de novo heterozygous variants of the n DNM1 gene, including 13 cases of missense variants, 1 case of frame shift variant and 1 case of nonsense variant, 8 cases of ectopic sites have not been reported.Multiple seizure types were observed, including epileptic spasms in 15 patients, focal seizure in 9 patients, atypical absence seizure in 2 patients and tonic seizure in 2 patients.There were various types of seizures in 7 children.Nine cases occurred as infantile spasm for the first time.All 15 patients showed varied degrees of development delay, among them, 11 cases had developmental retardation before epilepsy.Three patients had slow rhythm of electroencephalogram background activity, the electroencephalography showed hypsarrhythmia in 13 patients; clinical seizures were detected in 8 cases, among them, epileptic spasms were captured in 7 patients, tonic seizure was captured in 1 patient.Widened frontotemporal subarachnoid space, cerebral atrophy, and corpus callosum dysplasia were examined in 6, 2 and 3 patients by cranial magnetic resonance imaging, respectively.All 15 cases were diagnosed as developmental epileptic encephalopathy, of which 13 cases were consistent with infantile spasms.The age of the last follow-up ranged from 1 year old to 7 years old.After multi-antiepileptic drug treatment, 2 patients were remission, 1 patient(small size of identical twins) died of severe pneumonia at the age of 2 years, and 12 patients still had intermittent seizures, of which 1 patient was transformed from infantile spasms to Lennox-Gastaut syndrome.n Conclusions:The onset age of developmental epileptic encephalopathy caused by the n DNM1 gene variant usually begins in the infantile period, the peak onset age was 8 months.The main types of seizures include epileptic spasms and focal seizures, developmental retardation can occur before seizures.The clinical manifestations are mostly infantile spasms syndrome, and some children can be transformed into Lennox-Gastaut syndrome.n