A peptide encoded by circular form of LINC-PINT suppresses oncogenic transcriptional elongation in glioblastoma.

A peptide encoded by circular form of LINC-PINT suppresses oncogenic transcriptional elongation in glioblastoma.
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由环状 LINC-PINT 编码的肽抑制胶质母细胞瘤中的致癌转录延伸

DOI:
10.1038/s41467-018-06862-2
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发表时间:
2018-10-26
影响因子:
16.6
通讯作者:
Zhang N
Zhang N
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zhang M;Zhao K;Xu X;Yang Y;Yan S;Wei P;Liu H;Xu J;Xiao F;Zhou H;Yang X;Huang N;Liu J;He K;Xie K;Zhang G;Huang S;Zhang N

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环状rna (circRNAs)是哺乳动物基因组中的一大转录本。尽管已经报道了circrna的翻译,但其他编码circrna及其翻译产物的功能仍然难以捉摸。在这里,我们证明了由长链非编码RNA产生的内源性环状RNA编码调控肽。通过核糖体新生链复合物结合RNA测序(RNA -seq),我们发现了几种可能由环状RNA编码的肽。我们鉴定了一种由长基因间非蛋白编码RNA p53诱导转录物(LINC-PINT)的环状形式编码的87个氨基酸的肽,该肽在体外和体内抑制胶质母细胞瘤细胞的增殖。这种肽直接与聚合酶相关因子复合物(PAF1c)相互作用,抑制多种癌基因的转录延伸。与正常组织相比,胶质母细胞瘤中该肽及其相应circRNA的表达降低。我们的研究结果证实了环状rna编码的肽的存在,并证明了它们在胶质母细胞瘤发生中的潜在功能。
Circular RNAs (circRNAs) are a large class of transcripts in the mammalian genome. Although the translation of circRNAs was reported, additional coding circRNAs and the functions of their translated products remain elusive. Here, we demonstrate that an endogenous circRNA generated from a long noncoding RNA encodes regulatory peptides. Through ribosome nascent-chain complex-bound RNA sequencing (RNC-seq), we discover several peptides potentially encoded by circRNAs. We identify an 87-amino-acid peptide encoded by the circular form of the long intergenic non-protein-coding RNA p53-induced transcript (LINC-PINT) that suppresses glioblastoma cell proliferation in vitro and in vivo. This peptide directly interacts with polymerase associated factor complex (PAF1c) and inhibits the transcriptional elongation of multiple oncogenes. The expression of this peptide and its corresponding circRNA are decreased in glioblastoma compared with the levels in normal tissues. Our results establish the existence of peptides encoded by circRNAs and demonstrate their potential functions in glioblastoma tumorigenesis.
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