Increase in hnRNPA1 Expression Suffices to Kill Motor Neurons in Transgenic Rats.

Increase in hnRNPA1 Expression Suffices to Kill Motor Neurons in Transgenic Rats.
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DOI:
10.3390/ijms242216214
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发表时间:
2023-11-11
影响因子:
5.6
通讯作者:
--
中科院分区:
生物学2区
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--
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异质性核糖核蛋白A1(hnRNPA1)的一个显性突变会导致肌萎缩侧索硬化症(ALS),但尚不清楚该突变是通过功能增强还是减弱导致运动神经元死亡。为了阐明致病性hnRNPA1突变与其天然功能之间的关系,我们培育了新型转基因大鼠,使其仅在运动神经元中过表达野生型大鼠hnRNPA1。这种野生型hnRNPA1的靶向表达导致转基因大鼠出现严重的运动神经元丢失以及随后的失神经肌肉萎缩,重现了ALS的特征。这些发现表明,hnRNPA1表达的增加足以引发运动神经元变性以及ALS样表型的出现。有理由推断,一种尚未确定的hnRNPA1功能的增强在由致病性hnRNPA1突变引起的家族性ALS的发病机制中起着关键作用。
A dominant mutation in hnRNPA1 causes amyotrophic lateral sclerosis (ALS), but it is not known whether this mutation leads to motor neuron death through increased or decreased function. To elucidate the relationship between pathogenic hnRNPA1 mutation and its native function, we created novel transgenic rats that overexpressed wildtype rat hnRNPA1 exclusively in motor neurons. This targeted expression of wildtype hnRNPA1 caused severe motor neuron loss and subsequent denervation muscle atrophy in transgenic rats that recapitulated the characteristics of ALS. These findings demonstrate that the augmentation of hnRNPA1 expression suffices to trigger motor neuron degeneration and the manifestation of ALS-like phenotypes. It is reasonable to infer that an amplification of an as-yet undetermined hnRNPA1 function plays a pivotal role in the pathogenesis of familial ALS caused by pathogenic hnRNPA1 mutation.
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