Two novel alleles of tottering with distinct Ca(v)2.1 calcium channel neuropathologies.

Two novel alleles of tottering with distinct Ca(v)2.1 calcium channel neuropathologies.
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DOI:
10.1016/j.neuroscience.2008.05.028
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发表时间:
2008-07-31
期刊:
影响因子:
3.3
通讯作者:
Letts, V. A.
Letts, V. A.
中科院分区:
医学3区
文献类型:
--
作者:
Miki, T.;Zwingman, T. A.;Wakamori, M.;Lutz, C. M.;Cook, S. A.;Hosford, D. A.;Herrup, K.;Fletcher, C. F.;Mori, Y.;Frankel, W. N.;Letts, V. A.

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钙通道CACNA 1A基因编码电压依赖性钙Ca(v)2.1型通道的成孔、电压敏感亚基。该基因的突变与几种人类疾病有关,包括家族性偏瘫性偏头痛、发作性共济失调2型和脊髓小脑共济失调6型。小鼠同源基因Cacna 1a与步履蹒跚的Cacna 1atg突变系列相关。在这里,我们描述了两个新的错义突变等位基因,Cacna 1atg-4J和Cacna 1aTg-5 J。Cacna 1atg-4J突变是在结构域II的区段S5中的氨基酸581处的缬氨酸至丙氨酸的突变。隐性Cacna 1atg-4J突变体表现出共济失调,阵发性运动障碍和失神发作,让人想起原来的蹒跚小鼠。Cacna 1atg-4J突变体也显示出改变的激活和失活动力学的Ca(v)2.1通道,以前没有报道的其他摇摇欲坠的等位基因。半显性的Cacna 1aTg-5 J突变改变了保守的精氨酸残基谷氨酰胺在第1252位氨基酸内节段S4的结构域III。杂合子小鼠患有共济失调,纯合子很少存活。Cacna 1aTg-5 J突变导致电压激活和失活向较低电压的转变,表明该精氨酸残基对于感知Ca(v)2.1电压变化至关重要。这两个摇摇欲坠的小鼠模型说明了新的等位基因变体如何有助于Ca(v)2.1钙通道的功能研究。
The calcium channel CACNA1A gene encodes the pore-forming, voltage-sensitive subunit of the voltage-dependent calcium Ca(v)2.1 type channel. Mutations in this gene have been linked to several human disorders, including familial hemiplegic migraine, episodic ataxia 2 and spinocerebellar ataxia type 6. The mouse homologue, Cacna1a, is associated with the tottering, Cacna1atg, mutant series. Here we describe two new missense mutant alleles, Cacna1atg-4J and Cacna1aTg-5J. The Cacna1atg-4J mutation is a valine to alanine mutation at amino acid 581, in segment S5 of domain II. The recessive Cacna1atg-4J mutant exhibited the ataxia, paroxysmal dyskinesia and absence seizures reminiscent of the original tottering mouse. The Cacna1atg-4J mutant also showed altered activation and inactivation kinetics of the Ca(v)2.1 channel, not previously reported for other tottering alleles. The semi-dominant Cacna1aTg-5J mutation changed a conserved arginine residue to glutamine at amino acid 1252 within segment S4 of domain III. The heterozygous mouse was ataxic and homozygotes rarely survived. The Cacna1aTg-5J mutation caused a shift in both voltage activation and inactivation to lower voltages, showing that this arginine residue is critical for sensing Ca(v)2.1 voltage changes. These two tottering mouse models illustrate how novel allelic variants can contribute to functional studies of the Ca(v)2.1 calcium channel.
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发表时间: 1992-10-01
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DOI: 10.1074/jbc.270.29.17306
发表时间: 1995-07-21
影响因子: 4.8
作者:
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