Efficient backsplicing produces translatable circular mRNAs.

Efficient backsplicing produces translatable circular mRNAs.
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DOI:
10.1261/rna.048272.114
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发表时间:
2015-02
期刊:
RNA (New York, N.Y.)
影响因子:
--
通讯作者:
Wang Z
Wang Z
中科院分区:
其他
文献类型:
--
作者:
Wang Y;Wang Z

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虽然人类转录组包含大量的环状RNA(circRNA),但大多数circRNA的功能仍不清楚。序列注释表明,大多数circRNA是通过外显子之间的逆序拼接产生的。然而,这种反向剪接的机制在很大程度上是未知的。在这里,我们构建了一个单一的外显子minigene含有分裂GFP,并发现前mRNA确实产生circRNA通过有效的反向剪接在人类和果蝇细胞。反向剪接被互补内含子增强,互补内含子形成双链RNA结构以使剪接位点接近,但这种结构不是必需的。此外,反向剪接受一般剪接因子和顺式元件调控,但调控规则与典型剪接不同。产生的circRNA可以被翻译以产生功能蛋白。与线性mRNA不同,3′ UTR中的多聚腺苷或多聚胸苷可以抑制环状mRNA的翻译。这项研究表明,反向剪接可以有效地发生在不同的真核生物产生环状mRNA。
While the human transcriptome contains a large number of circular RNAs (circRNAs), the functions of most circRNAs remain unclear. Sequence annotation suggests that most circRNAs are generated from splicing in reversed orders across exons. However, the mechanisms of this backsplicing are largely unknown. Here we constructed a single exon minigene containing split GFP, and found that the pre-mRNA indeed produces circRNA through efficient backsplicing in human and Drosophila cells. The backsplicing is enhanced by complementary introns that form double-stranded RNA structure to bring splice sites in proximity, but such structure is not required. Moreover, backsplicing is regulated by general splicing factors and cis-elements, but with regulatory rules distinct from canonical splicing. The resulting circRNA can be translated to generate functional proteins. Unlike linear mRNA, poly-adenosine or poly-thymidine in 3′ UTR can inhibit circular mRNA translation. This study revealed that backsplicing can occur efficiently in diverse eukaryotes to generate circular mRNAs.
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