Upregulation of 5'-terminal oligopyrimidine mRNA translation upon loss of the ARF tumor suppressor.

Upregulation of 5'-terminal oligopyrimidine mRNA translation upon loss of the ARF tumor suppressor.
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损失ARF肿瘤抑制剂后,5'-末端寡嘧啶mRNA翻译的上调。

DOI:
10.1038/s41598-020-79379-8
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发表时间:
2020-12-17
期刊:
影响因子:
4.6
通讯作者:
Weber JD
Weber JD
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Cottrell KA;Chiou RC;Weber JD

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肿瘤细胞需要名义上增加蛋白质合成才能维持高增殖率。因此,肿瘤细胞必须获得增强的核糖体生产。肿瘤细胞中的大量突变最终如何实现这种异常生产在很大程度上是未知的。编码ARF的基因是人类癌症中最常见的缺失基因。ARF在调节核糖体RNA的合成和加工、核糖体输出到细胞质以及全球蛋白质合成方面发挥着重要作用。利用核糖体图谱,我们发现ARF是5‘端寡嘧啶mRNA翻译的主要抑制因子。ARF丢失后翻译效率提高的基因包括许多核糖体蛋白和翻译因子。P53基因敲除主要表现为ARF缺失,蛋白质合成增加,5‘-TOP编码蛋白表达增加。5‘-顶端调控因子eIF4G1和LARP1在Arf-和P53-空细胞中上调。
Tumor cells require nominal increases in protein synthesis in order to maintain high proliferation rates. As such, tumor cells must acquire enhanced ribosome production. How the numerous mutations in tumor cells ultimately achieve this aberrant production is largely unknown. The gene encoding ARF is the most commonly deleted gene in human cancer. ARF plays a significant role in regulating ribosomal RNA synthesis and processing, ribosome export into the cytoplasm, and global protein synthesis. Utilizing ribosome profiling, we show that ARF is a major suppressor of 5′-terminal oligopyrimidine mRNA translation. Genes with increased translational efficiency following loss of ARF include many ribosomal proteins and translation factors. Knockout of p53 largely phenocopies ARF loss, with increased protein synthesis and expression of 5′-TOP encoded proteins. The 5′-TOP regulators eIF4G1 and LARP1 are upregulated in Arf- and p53-null cells.
DOI: 10.1093/bioinformatics/btu638
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