A recurrent mutation in KCNA2 as a novel cause of hereditary spastic paraplegia and ataxia.

A recurrent mutation in KCNA2 as a novel cause of hereditary spastic paraplegia and ataxia.
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DOI:
10.1002/ana.24762
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发表时间:
2016-10
影响因子:
11.2
通讯作者:
Lemke, Johannes R.
Lemke, Johannes R.
中科院分区:
医学1区
文献类型:
--
作者:
Helbig, Katherine L.;Hedrich, Ulrike B. S.;Shinde, Deepali N.;Krey, Ilona;Teichmann, Anne-Christin;Hentschel, Julia;Schubert, Julian;Chamberlin, Adam C.;Huether, Robert;Lu, Hsiao-Mei;Alcaraz, Wendy A.;Tang, Sha;Jungbluth, Chelsy;Dugan, Sarah L.;Vainionpaa, Leena;Karle, Kathrin N.;Synofzik, Matthis;Schols, Ludger;Schule, Rebecca;Lehesjoki, Anna-Elina;Helbig, Ingo;Lerche, Holger;Lemke, Johannes R.

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遗传性痉挛性截瘫 (HSP) 是一种异质性神经退行性疾病,具有超过 50 个已知致病基因。我们在两个患有 HSP、智力障碍 (ID) 和共济失调的不相关家族中发现了 KCNA2 (c.881G>A, p.R294H) 的反复突变,该突变编码电压门控 K+通道 KV1.2。对超过 2,000 名具有各种神经表型的患者进行的随访分析发现,患有共济失调和智障的先证者存在新的 p.R294H 突变。表达突变 KV1.2 通道的非洲爪蟾卵母细胞的双电极电压钳记录显示功能丧失并具有显性负效应。我们的研究结果强调了复发性 KCNA2 突变的表型谱,表明离子通道功能障碍是一种新的 HSP 疾病机制。安·尼罗尔 2016
The hereditary spastic paraplegias (HSPs) are heterogeneous neurodegenerative disorders with over 50 known causative genes. We identified a recurrent mutation in KCNA2 (c.881G>A, p.R294H), encoding the voltage‐gated K+‐channel, KV1.2, in two unrelated families with HSP, intellectual disability (ID), and ataxia. Follow‐up analysis of > 2,000 patients with various neurological phenotypes identified a de novo p.R294H mutation in a proband with ataxia and ID. Two‐electrode voltage‐clamp recordings of Xenopus laevis oocytes expressing mutant KV1.2 channels showed loss of function with a dominant‐negative effect. Our findings highlight the phenotypic spectrum of a recurrent KCNA2 mutation, implicating ion channel dysfunction as a novel HSP disease mechanism. Ann Neurol 2016
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