Human CHN1 mutations hyperactivate alpha2-chimaerin and cause Duane's retraction syndrome.

Human CHN1 mutations hyperactivate alpha2-chimaerin and cause Duane's retraction syndrome.
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DOI:
10.1126/science.1156121
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发表时间:
2008-08-08
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Engle EC
Engle EC
中科院分区:
其他
文献类型:
--
作者:
Miyake N;Chilton J;Psatha M;Cheng L;Andrews C;Chan WM;Law K;Crosier M;Lindsay S;Cheung M;Allen J;Gutowski NJ;Ellard S;Young E;Iannaccone A;Appukuttan B;Stout JT;Christiansen S;Ciccarelli ML;Baldi A;Campioni M;Zenteno JC;Davenport D;Mariani LE;Sahin M;Guthrie S;Engle EC

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RacGAP 分子 α2-chimaerin 参与精确引导皮质脊髓轴突发育所需的神经元信号传导通路。我们现在证明,杜安回缩综合征的一种变体是一种先天性眼球运动障碍,受影响的个体表现出轴突投射到眼外肌的异常发育,可能是由于 CHN1 中的功能获得性杂合错义突变引起的,该突变增加了 α2-嵌合蛋白 RacGAP 的体外活性。一部分突变增强了 α2-嵌合蛋白膜易位和/或 α2-嵌合蛋白以前未被识别的与其自身形成复合物的能力。突变体 CHN1 的卵内表达改变了眼部运动轴突的发育。这些数据表明,人类 CHN1 突变可以过度激活 α2-chimaerin,并导致颅运动神经元发育异常。
The RacGAP molecule α2-chimaerin is implicated in neuronal signaling pathways required for precise guidance of developing corticospinal axons. We now demonstrate that a variant of Duane’s retraction syndrome, a congenital eye movement disorder in which affected individuals show aberrant development of axon projections to the extraocular muscles, can result from gain-of-function heterozygous missense mutations in CHN1 that increase α2-chimaerin RacGAP activity in vitro. A subset of mutations enhances α2-chimaerin membrane translocation and/or α2-chimaerin’s previously unrecognized ability to form a complex with itself. In ovo expression of mutant CHN1 alters the development of ocular motor axons. These data demonstrate that human CHN1 mutations can hyperactivate α2-chimaerin and result in aberrant cranial motor neuron development.
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