RNA function. Ribosome stalling induced by mutation of a CNS-specific tRNA causes neurodegeneration.

RNA function. Ribosome stalling induced by mutation of a CNS-specific tRNA causes neurodegeneration.
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DOI:
10.1126/science.1249749
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发表时间:
2014-07-25
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Ackerman SL
Ackerman SL
中科院分区:
其他
文献类型:
--
作者:
Ishimura R;Nagy G;Dotu I;Zhou H;Yang XL;Schimmel P;Senju S;Nishimura Y;Chuang JH;Ackerman SL

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在高等真核生物中,具有相同反密码子的tRNA由多个核基因编码,并且对这些基因中的突变如何影响翻译和细胞内稳态知之甚少。类似地,对高等真核生物中的这种缺陷作出反应的监视系统也不清楚。在这里,我们发现GTPBP2的损失,核糖体回收蛋白Pelota的一种新的结合伴侣,在小鼠中具有在中枢神经系统中特异性表达的tRNA基因突变,导致核糖体停滞和广泛的神经变性。我们的研究结果不仅将GTPBP2定义为核糖体拯救因子,还揭示了核编码tRNA基因突变的疾病潜力。
In higher eukaryotes, tRNAs with the same anticodon are encoded by multiple nuclear genes and little is known about how mutations in these genes affect translation and cellular homeostasis. Similarly, the surveillance systems that respond to such defects in higher eukaryotes are not clear. Here, we discover that loss of GTPBP2, a novel binding partner of the ribosome recycling protein Pelota, in mice with a mutation in a tRNA gene that is specifically expressed in the central nervous system causes ribosome stalling and widespread neurodegeneration. Our results not only define GTPBP2 as a ribosome rescue factor, but also unmask the disease potential of mutations in nuclear-encoded tRNA genes.
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