CGG repeat-associated translation mediates neurodegeneration in fragile X tremor ataxia syndrome.
CGG repeat-associated translation mediates neurodegeneration in fragile X tremor ataxia syndrome.
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DOI:
10.1016/j.neuron.2013.03.026
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发表时间:
2013-05-08
期刊:
影响因子:
16.2
通讯作者:
Paulson HL
中科院分区:
文献类型:
--
作者:
Todd PK;Oh SY;Krans A;He F;Sellier C;Frazer M;Renoux AJ;Chen KC;Scaglione KM;Basrur V;Elenitoba-Johnson K;Vonsattel JP;Louis ED;Sutton MA;Taylor JP;Mills RE;Charlet-Berguerand N;Paulson HL
Fragile X-associated Tremor Ataxia Syndrome (FXTAS) results from a CGG repeat expansion in the 5’UTR of FMR1. This repeat is thought to elicit toxicity as RNA yet disease brains contain ubiquitin-positive neuronal inclusions, a pathologic hallmark of protein-mediated neurodegeneration. We explain this paradox by demonstrating that CGG repeats trigger repeat associated non-AUG initiated (RAN) translation of a cryptic polyglycine-containing protein, FMRpolyG. FMRpolyG accumulates in ubiquitin-positive inclusions in Drosophila, cell culture, mouse disease models and FXTAS patient brains. CGG RAN translation occurs in at least two of three possible reading frames at repeat sizes ranging from normal (25) to pathogenic (90), but inclusion formation only occurs with expanded repeats. In Drosophila, CGG repeat toxicity is suppressed by eliminating RAN translation and enhanced by increased polyglycine protein production. These studies expand the growing list of nucleotide repeat disorders where RAN translation occurs and provide evidence that RAN translation contributes to neurodegeneration.
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影响因子:
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通讯作者:
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影响因子:
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DOI:
10.1073/pnas.1207846109
发表时间:
2012-09-11
影响因子:
11.1
作者:
Lee, Sooncheol;Liu, Botao;Qian, Shu-Bing
通讯作者:
Qian, Shu-Bing