Chtop (Chromatin target of Prmt1) auto-regulates its expression level via intron retention and nonsense-mediated decay of its own mRNA.

Chtop (Chromatin target of Prmt1) auto-regulates its expression level via intron retention and nonsense-mediated decay of its own mRNA.
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DOI:
10.1093/nar/gkw831
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发表时间:
2016-11-16
影响因子:
14.9
通讯作者:
Takahashi N
Takahashi N
中科院分区:
生物学2区
文献类型:
--
作者:
Izumikawa K;Yoshikawa H;Ishikawa H;Nobe Y;Yamauchi Y;Philipsen S;Simpson RJ;Isobe T;Takahashi N

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Chtop(Prmt1 的染色质靶标)调节基因表达的各个方面,包括转录和 mRNA 输出。尽管有这些重要的功能,Chtop 表达背后的调控机制仍不清楚。使用表达 Chtop 的人类细胞系,我们证明 Chtop 表达是通过自动调节负反馈环控制的,其中 Chtop 结合其自身的 mRNA 以在剪接过程中保留内含子 2;内含子 2 5' 端存在的过早终止密码子会导致 mRNA 的无义介导的衰变。我们还表明,Chtop 通过其富含精氨酸-甘氨酸 (RG) 的结构域与 Chtop mRNA 的外显子 2 相互作用,并通过其 N 末端 (N1) 结构域与内含子 2 相互作用;两者都是保留内含子 2 所必需的。此外,我们发现 hnRNP H 以依赖于 Chtop 表达水平的方式加速 Chtop mRNA 的内含子 2 剪接,这表明 Chtop 和 hnRNP H 拮抗地调节 Chtop mRNA 的内含子 2 保留。因此,本研究提供了一种新的分子机制,通过内含子保留来组成性调节 mRNA 和蛋白质水平。
Chtop (chromatin target of Prmt1) regulates various aspects of gene expression including transcription and mRNA export. Despite these important functions, the regulatory mechanism underlying Chtop expression remains undetermined. Using Chtop-expressing human cell lines, we demonstrate that Chtop expression is controlled via an autoregulatory negative feedback loop whereby Chtop binds its own mRNA to retain intron 2 during splicing; a premature termination codon present at the 5′ end of intron 2 leads to nonsense-mediated decay of the mRNA. We also show that Chtop interacts with exon 2 of Chtop mRNA via its arginine-glycine-rich (RG) domain, and with intron 2 via its N-terminal (N1) domain; both are required for retention of intron 2. In addition, we show that hnRNP H accelerates intron 2 splicing of Chtop mRNA in a manner dependent on Chtop expression level, suggesting that Chtop and hnRNP H regulate intron 2 retention of Chtop mRNA antagonistically. Thus, the present study provides a novel molecular mechanism by which mRNA and protein levels are constitutively regulated by intron retention.
DOI: 10.1099/jgv.0.000503
发表时间: 2016-08
期刊: The Journal of general virology
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