Axonal transport of TDP-43 mRNA granules is impaired by ALS-causing mutations.

Axonal transport of TDP-43 mRNA granules is impaired by ALS-causing mutations.
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DOI:
10.1016/j.neuron.2013.12.018
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发表时间:
2014-02-05
期刊:
影响因子:
16.2
通讯作者:
Taylor JP
Taylor JP
中科院分区:
医学1区
文献类型:
--
作者:
Alami NH;Smith RB;Carrasco MA;Williams LA;Winborn CS;Han SSW;Kiskinis E;Winborn B;Freibaum BD;Kanagaraj A;Clare AJ;Badders NM;Bilican B;Chaum E;Chandran S;Shaw CE;Eggan KC;Maniatis T;Taylor JP

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RNA结合蛋白TDP-43在多个层面调控RNA代谢,包括转录、RNA剪接和mRNA稳定性。TDP-43是肌萎缩性侧索硬化症和某些类型额颞叶变性的细胞质包涵体的主要成分。尽管TDP-43在发病机制中的作用尚不清楚,但显性错义突变足以引起疾病,这一事实强调了TDP-43在疾病中的重要性。在这里,我们发现TDP-43形成细胞质mRNP颗粒,在体外和体内神经元中进行双向、微管依赖性的运输,并促进目标mRNA传递到远端神经元室。在体内和体外,TDP-43突变损害了这种mRNA的转运功能,包括来自患有三种不同的TDP-43 ALS突变的ALS患者的干细胞来源的运动神经元。因此,导致ALS的TDP43突变导致TDP-43的一种新的细胞质功能部分丧失。
The RNA binding protein TDP-43 regulates RNA metabolism at multiple levels, including transcription, RNA splicing, and mRNA stability. TDP-43 is a major component of the cytoplasmic inclusions characteristic of amyotrophic lateral sclerosis and some types of frontotemporal lobar degeneration. The importance of TDP-43 in disease is underscored by the fact that dominant missense mutations are sufficient to cause disease, although the role of TDP-43 in pathogenesis is unknown. Here we show that TDP-43 forms cytoplasmic mRNP granules that undergo bidirectional, microtubule-dependent transport in neurons in vitro and in vivo and facilitate delivery of target mRNA to distal neuronal compartments. TDP-43 mutations impair this mRNA transport function in vivo and in vitro, including in stem cell-derived motor neurons from ALS patients bearing any one of three different TDP-43 ALS-causing mutations. Thus, TDP43 mutations that cause ALS lead to partial loss of a novel cytoplasmic function of TDP-43.
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