解析德拉韦特综合征:探索钠通道突变对神经网络的复杂影响。
Unraveling Dravet Syndrome: Exploring the complex effects of sodium channel mutations on neuronal networks.
作者信息
Doorn Nina
机构信息
Department of Clinical Neurophysiology, University of Twente, Enschede, The Netherlands.
出版信息
Sci Prog. 2024 Jan-Mar;107(1):368504231225076. doi: 10.1177/00368504231225076.
Dravet Syndrome (DS) is a severe developmental epileptic encephalopathy with frequent intractable seizures accompanied by cognitive impairment, often caused by pathogenic variants in encoding sodium channel Na1.1. Recent research utilizing patient-derived neuronal networks and accompanying models uncovered that not just sodium-but also potassium-and synaptic currents were impaired in DS networks. Here, we explore the implications of these findings for three questions that remain elusive in DS: How do sodium channel impairments result in epilepsy? How can identical variants lead to varying phenotypes? What mechanisms underlie the developmental delay in DS patients? We speculate that impaired potassium currents might be a secondary effect to Na1.1 mutations and could result in hyperexcitable neurons and epileptic networks. Moreover, we reason that homeostatic plasticity is actively engaged in DS networks, possibly affecting the phenotype and impairing learning and development when driven to extremes.
德拉韦综合征(DS)是一种严重的发育性癫痫性脑病,频繁发作难以控制,伴有认知障碍,通常由编码钠通道Na1.1的致病变异引起。最近利用患者来源的神经网络及相关模型进行的研究发现,DS神经网络中不仅钠电流,而且钾电流和突触电流均受损。在此,我们探讨这些发现对DS中仍难以捉摸的三个问题的意义:钠通道损伤如何导致癫痫?相同的变异为何会导致不同的表型?DS患者发育迟缓的潜在机制是什么?我们推测,钾电流受损可能是Na1.1突变的继发效应,可能导致神经元过度兴奋和癫痫网络。此外,我们推断稳态可塑性在DS神经网络中积极发挥作用,当被推向极端时,可能会影响表型并损害学习和发育。
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