Loss of MEC-17 leads to microtubule instability and axonal degeneration.

Loss of MEC-17 leads to microtubule instability and axonal degeneration.
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DOI:
10.1016/j.celrep.2013.12.004
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发表时间:
2014-01-16
期刊:
影响因子:
8.8
通讯作者:
Hilliard MA
Hilliard MA
中科院分区:
生物学1区
文献类型:
--
作者:
Neumann B;Hilliard MA

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轴突变性是神经元损伤的结果,是许多神经退行性疾病的共同特征。然而,引发这一过程的遗传原因和细胞机制在很大程度上仍不清楚。在线虫正向遗传筛选的基础上,我们已经确定α-微管蛋白乙酰转移酶基因mec-17导致自发性、成年性和进行性轴突变性。MEC-17的缺失导致微管不稳定,线粒体数量减少,轴突运输中断,线粒体和突触成分的分布发生改变。此外,mec-17介导的轴突变性独立于其乙酰转移酶结构域发生;通过微管蛋白相关分子Coel-1的突变而增强;并与动物的身体长度相关。因此,这项研究确定了保守的微管相关蛋白MEC-17在保护轴突完整性和防止轴突退化方面的关键作用。
Axonal degeneration arises as a consequence of neuronal injury and is a common hallmark of a number of neurodegenerative diseases. However, the genetic causes and the cellular mechanisms that trigger this process are still largely unknown. Based on forward genetic screening in C. elegans, we have identified the α-tubulin acetyltransferase gene mec-17 as causing spontaneous, adult-onset, and progressive axonal degeneration. Loss of MEC-17 leads to microtubule instability, a reduction in mitochondrial number, and disrupted axonal transport, with altered distribution of both mitochondria and synaptic components. Furthermore, mec-17-mediated axonal degeneration occurs independently from its acetyltransferase domain; is enhanced by mutation of coel-1, a tubulin-associated molecule; and correlates with the animal’s body length. This study therefore identifies a critical role for the conserved microtubule-associated protein MEC-17 in preserving axon integrity and preventing axonal degeneration.
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