Recoding RNA editing of AZIN1 predisposes to hepatocellular carcinoma.

Recoding RNA editing of AZIN1 predisposes to hepatocellular carcinoma.
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AZIN1 的重新编码 RNA 编辑易诱发肝细胞癌。

DOI:
10.1038/nm.3043
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发表时间:
2013-02
期刊:
影响因子:
82.9
通讯作者:
--
中科院分区:
医学1区
文献类型:
--
作者:

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在分子水平上更好地理解人类肝细胞癌(HCC)的发病机制将有助于发现肿瘤起始事件。在此,转录组测序揭示了抗酶抑制剂1(AZIN 1)的腺苷(A)至肌苷(I)RNA编辑在HCC标本中显示出高修饰率。AZIN 1转录物的A至I编辑由作用于RNA-1的腺苷脱氨酶(ADAR 1)特异性调节。位于β-链15(β15)的第367位残基处的丝氨酸(S)→甘氨酸(G)取代预测了构象变化,诱导了细胞质至细胞核的易位,并赋予了“功能获得”表型,表现为增强的肿瘤引发潜力和更具侵袭性的行为。与野生型AZIN 1蛋白相比,编辑形式具有更强的抗酶亲和力,并且由此产生的更高的蛋白稳定性通过中和抗酶介导的鸟氨酸脱羧酶(ODC)和细胞周期蛋白D1(CCND 1)的降解来促进细胞增殖。总的来说,AZIN 1的A-to-IRNA编辑可能是人类癌症,特别是HCC发病机制的潜在驱动因素。
Better understanding of human hepatocellular carcinoma (HCC) pathogenesis at the molecular level will facilitate the discovery of tumor initiating events. Herein, transcriptome sequencing revealed that adenosine (A)-to-inosine (I) RNA editing of antizyme inhibitor 1 (AZIN1) displays a high modification rate in HCC specimens. A-to-I editing of AZIN1 transcripts is specifically regulated by adenosine deaminase acting on RNA-1 (ADAR1). The serine (S) → glycine (G) substitution at residue 367, located in β-strand 15 (β15), predicted a conformational change, induced a cytoplasmic-to-nuclear translocation, and conferred “gain-of-function” phenotypes manifested by augmented tumor initiating potential and more aggressive behavior. Compared with wild-type AZIN1 protein, the edited form possesses stronger affinity to antizyme, and the resultant higher protein stability promotes cell proliferation via the neutralization of antizyme-mediated degradation of ornithine decarboxylase (ODC) and cyclin D1 (CCND1). Collectively, A-to-I RNA editing of AZIN1 may be a potential driver in the pathogenesis of human cancers, particularly HCC.
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