Tardbpl splicing rescues motor neuron and axonal development in a mutant tardbp zebrafish.

Tardbpl splicing rescues motor neuron and axonal development in a mutant tardbp zebrafish.
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DOI:
10.1093/hmg/ddt082
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发表时间:
2013-06-15
影响因子:
3.5
通讯作者:
Shaw PJ
Shaw PJ
中科院分区:
生物学2区
文献类型:
--
作者:
Hewamadduma CA;Grierson AJ;Ma TP;Pan L;Moens CB;Ingham PW;Ramesh T;Shaw PJ

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调控转录和剪接的交互反应DNA结合蛋白43 (TARDBP/TDP-43)基因突变导致家族性肌萎缩性侧索硬化症(ALS)。在这里,我们描述并报道了斑马鱼中的第一个tardbp突变,该突变引入了一个过早停止密码子(Y220X),消除了tardbp蛋白的表达。另一个TARDBP同源基因tardbpl在斑马鱼中编码一个类似TARDBP的蛋白,该蛋白与TARDBP本身相比被截断,并且缺乏部分c端富含甘氨酸结构域(GRD)。在这里,我们发现tardbp突变导致新的tardbp剪接形式(tardbl - fl)的产生,能够产生全长的tardbp蛋白(tardbl - fl),从而弥补了tardbp的缺失。这一发现为研究tdp -43介导的剪接调控提供了一种新的体内模型。此外,我们发现,消除这两种斑马鱼的TARDBP同源基因会导致严重的运动表型,运动轴突缩短,运动缺陷和受精后10天左右的死亡。本研究建立的Tardbp/Tardbpl基因敲除模型为研究Tardbp功能丧失及其在ALS发病机制中的作用提供了一个很好的体内系统。
Mutations in the transactive response DNA binding protein-43 (TARDBP/TDP-43) gene, which regulates transcription and splicing, causes a familial form of amyotrophic lateral sclerosis (ALS). Here, we characterize and report the first tardbp mutation in zebrafish, which introduces a premature stop codon (Y220X), eliminating expression of the Tardbp protein. Another TARDBP ortholog, tardbpl, in zebrafish is shown to encode a Tardbp-like protein which is truncated compared with Tardbp itself and lacks part of the C-terminal glycine-rich domain (GRD). Here, we show that tardbp mutation leads to the generation of a novel tardbpl splice form (tardbpl-FL) capable of making a full-length Tardbp protein (Tardbpl-FL), which compensates for the loss of Tardbp. This finding provides a novel in vivo model to study TDP-43-mediated splicing regulation. Additionally, we show that elimination of both zebrafish TARDBP orthologs results in a severe motor phenotype with shortened motor axons, locomotion defects and death at around 10 days post fertilization. The Tardbp/Tardbpl knockout model generated in this study provides an excellent in vivo system to study the role of the functional loss of Tardbp and its involvement in ALS pathogenesis.
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发表时间: 2010-04
期刊: Neuropathology : official journal of the Japanese Society of Neuropathology
影响因子: --
作者:
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发表时间: 2010-02-15
影响因子: 3.5
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