FUS-SMN protein interactions link the motor neuron diseases ALS and SMA.

FUS-SMN protein interactions link the motor neuron diseases ALS and SMA.
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DOI:
10.1016/j.celrep.2012.08.025
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发表时间:
2012-10-25
期刊:
影响因子:
8.8
通讯作者:
Reed R
Reed R
中科院分区:
生物学1区
文献类型:
--
作者:
Yamazaki T;Chen S;Yu Y;Yan B;Haertlein TC;Carrasco MA;Tapia JC;Zhai B;Das R;Lalancette-Hebert M;Sharma A;Chandran S;Sullivan G;Nishimura AL;Shaw CE;Gygi SP;Shneider NA;Maniatis T;Reed R

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RNA结合蛋白FUS的突变导致ALS,一种致命的成人运动神经元疾病。SMN表达减少导致致命的儿童运动神经元疾病SMA。SMN复合物定位于细胞质和细胞核Gems中,Gems的丢失是SMA患者成纤维细胞的细胞标志。在这里,我们报告说,FUS与SMN复合物,U1 snRNP介导的相互作用和FUS和SMN之间的直接相互作用。在功能上,我们表明,FUS是需要在HeLa细胞中的宝石形成,FUS的表达含有严重的ALS引起的突变(R495 X)也导致宝石损失。引人注目的是,在表达突变FUS或TDP-43(另一种与FUS相互作用的ALS引起蛋白质)的ALS患者成纤维细胞中观察到Gems减少。SMN,FUS,TDP-43和Gems之间的物理和功能相互作用表明ALS和SMA共享生化途径,为这些运动神经元疾病相关的观点提供了强有力的新支持。
Mutations in the RNA binding protein FUS cause ALS, a fatal adult motor neuron disease. Decreased expression of SMN causes the fatal childhood motor neuron disorder SMA. The SMN complex localizes in both the cytoplasm and nuclear Gems, and loss of Gems is a cellular hallmark of SMA patient fibroblasts. Here, we report that FUS associates with the SMN complex, an interaction mediated by U1 snRNP and by direct interactions between FUS and SMN. Functionally, we show that FUS is required for Gem formation in HeLa cells, and expression of FUS containing a severe ALS-causing mutation (R495X) also results in Gem loss. Strikingly, a reduction in Gems is observed in ALS patient fibroblasts expressing either mutant FUS or TDP-43, another ALS-causing protein that interacts with FUS. The physical and functional interactions between SMN, FUS, TDP-43, and Gems indicate that ALS and SMA share a biochemical pathway, adding strong new support to the view that these motor neuron diseases are related.
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