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• W3114160661 abstract "Objective: To report a Chinese family with hypokalemic periodic paralysis (HOKPP) and investigate the clinical and pathogenic gene characteristics of the family. Methods: The clinical, electrophysiological and pathological data of the proband of the family were analyzed, and the information of the family was investigated in detail. The peripheral venous blood of the six members of the family was collected and their genomic DNA was extracted. The genes related to periodic paralysis analysis of the proband were performed by the second generation sequencing. The pathogenicity of the mutant protein was respectively analyzed by the bioinformatics software SIFT, Polyphen2 and Mutation Tasker. The cosegregation analysis of phenotype and genotype of the family was performed by the first generation sequencing. Results: There were 3 patients in the family with the onset age of 21 to 42 years old. All the patients manifested with vomiting as the first symptoms, then presented with muscle weakness accompanied by muscle soreness. The muscle weakness gradually relieved in 3 to 5 days. Creatine kinase (CK) of the proband significantly increased. Electromyographic exercise test was positive, however, electromyography and muscle pathological analysis were normal. The genes related to periodic paralysis analysis of the proband found a novel mutation (c.2458A>T (p.N.820Y)) of SCN4A gene which was located in the conservative region. The function analysis showed it was a pathogenic mutation. Moreover, the first generation sequencing confirmed that the mutation was cosegregated with patients in the family. Meanwhile, it was found that the proband's son carried the same mutation, but without any symptom, indicating that he was a pre-symptomatic patient. Conclusions: Vomiting can be one of the symptoms of the patients with HOKPP. The novel mutation of SCN4A gene c.2458 A>T is the pathogenic mutation of the family. Patients with periodic paralysis should be tested for blood potassium and genes as early as possible to facilitate early diagnosis and genetic counseling.目的： 报道一个中国人低钾性周期性瘫痪（HOKPP）家系，探讨该家系的临床及致病基因特点。 方法： 对该家系先证者的临床、电生理及病理资料进行分析，并对该家系进行详细的调查；采集该家系6名成员的外周静脉血并抽提其基因组DNA，采用二代测序技术对先证者进行周期性瘫痪相关基因检测，对所发现突变采用SIFT、PolyPhen 2及Mutation Taster软件进行突变蛋白功能的致病性分析；采用一代测序技术进行家系的表型和基因型共分离研究。 结果： 该家系3代患者3例，发病年龄21~42岁，主要表现为发作性四肢无力，以呕吐为首发症状，伴肌肉酸痛，持续3~5 d后缓解；先证者发作时肌酶明显升高，缓解后长时程运动诱发试验阳性，肌电图及肌肉病理未见异常；先证者周期性瘫痪相关基因二代测序发现SCN4A基因c.2458A>T（p.N820Y）新突变，该突变位于SCN4A蛋白保守区域，功能预测为致病性突变，一代测序验证该突变与家系内患者共分离，同时发现先证者儿子携带相同突变，目前尚未发病，为症状前患者。 结论： HOKPP患者可以呕吐为临床表现；SCN4A基因新突变c.2458A>T为该家系的致病突变；对伴有呕吐的周期性瘫痪患者尽早行血钾和基因检测，有助于早期诊治和遗传咨询。." @default.
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• W3114160661 date "2020-12-08" @default.
• W3114160661 modified "2023-09-25" @default.
• W3114160661 title "[A novel mutation of SCN4A gene causes hypokalemic periodic paralysis in a Chinese family]." @default.
• W3114160661 doi "https://doi.org/10.3760/cma.j.cn112137-20200421-01265" @default.
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