SCN1A

基因产物:钠离子通道α1亚基。

蛋白功能:主要在脑和周围神经中表达,可与钠离子通道β亚基组成电压门控性钠通道,参与神经递质释放的调节及机械性疼痛的感知。

相关疾病:热性惊厥(AD)[1];遗传性癫痫伴热性惊厥附加症(AD)[2];Dravet 综合征(AD)[3];婴儿癫痫伴游走性局灶性发作(AD)[4];家族性偏瘫型偏头痛(AD)[5];West 综合征[6];Lennox-Gastaut 综合征[6];癫痫伴肌阵挛-失张力发作(Doose 综合征)[6]。

突变数据库:ClinVar数据库

相关临床研究:PubMed数据库(PMID: 29540584 (Neurology. 2018); PMID: 28538134 (N Engl J Med. 2017); PMID: 25986195 (Epilepsy Res. 2015); PMID: 21569025 (Epilepsia. 2011); PMID: 17636062 (Neurology. 2007)

用药提醒多数情况下SCN1A基因突变往往是功能减弱型的,卡马西平、奥卡西平、苯妥英钠等钠通道阻滞剂可能会加重此基因突变相关的癫痫,需谨慎。当然也有个别功能增强型的报道(如 p.Thr226Met位点突变,参照文献PMID: 30779207(Ann Neurol. 2019))。

数据统计:点击查看不同SCN1A变异患儿使用过的最有效药物(数据来源于患儿家属,仅供参考)。

讨论版块点击进入SCN1A基因突变讨论版块

 

参考文献

  1. Mantegazza, M., et al., Identification of an Nav1.1 sodium channel (SCN1A) loss-of-function mutation associated with familial simple febrile seizures.Proc Natl Acad Sci U S A, 2005. 102(50): p. 18177-82.
  2. Spampanato, J., et al., Functional effects of two voltage-gated sodium channel mutations that cause generalized epilepsy with febrile seizures plus type 2.J Neurosci, 2001. 21(19): p. 7481-90.
  3. Ohmori, I., et al., Significant correlation of the SCN1A mutations and severe myoclonic epilepsy in infancy.Biochem Biophys Res Commun, 2002. 295(1): p. 17-23.
  4. Carranza Rojo, D., et al., De novo SCN1A mutations in migrating partial seizures of infancy.Neurology, 2011. 77(4): p. 380-3.
  5. Vahedi, K., et al., Elicited repetitive daily blindness: a new phenotype associated with hemiplegic migraine and SCN1A mutations.Neurology, 2009. 72(13): p. 1178-83.
  6. McTague, A., et al., The genetic landscape of the epileptic encephalopathies of infancy and childhood. Lancet Neurol, 2016. 15(3): p. 304-16.