Conserved sequence-specific lincRNA-steroid receptor interactions drive transcriptional repression and direct cell fate.

Conserved sequence-specific lincRNA-steroid receptor interactions drive transcriptional repression and direct cell fate.
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DOI:
10.1038/ncomms6395
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发表时间:
2014-11-07
影响因子:
16.6
通讯作者:
Ortlund, Eric A.
Ortlund, Eric A.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Hudson, William H.;Pickard, Mark R.;de Vera, Ian Mitchelle S.;Kuiper, Emily G.;Mourtada-Maarabouni, Mirna;Conn, Graeme L.;Kojetin, Douglas J.;Williams, Gwyn T.;Ortlund, Eric A.

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真核生物基因组的大部分是转录的,产生了大量的长的基因间非编码RNA(LincRNAs)。虽然lincRNAs是最鲜为人知的转录产物,但最近的研究表明lincRNAs具有重要的细胞功能。除了序列保守性低外,对lincRNA生物学驱动的结构机制的缺乏理解阻碍了对其功能的系统预测。在这里,我们报告了通过lincRNA Gas5识别类固醇受体(SRS)的分子要求,它调节类固醇介导的转录调节、生长停滞和细胞凋亡。我们鉴定了功能上的Gas5-SR界面,并产生了点突变,从而消除了SR-Gas5 lincRNA的相互作用,改变了Gas5驱动的癌细胞株的凋亡。此外,我们发现Gas5 SR识别序列在单倍体中是保守的,其进化起源是剪接受体位点。这项研究表明,lincRNAs可以以一种保守的、序列特异的方式识别蛋白质靶标,从而影响关键的细胞功能。
The majority of the eukaryotic genome is transcribed, generating a significant number of long intergenic non-coding RNAs (lincRNAs). While lincRNAs represent the most poorly understood product of transcription, recent work has shown lincRNAs fulfill important cellular functions. In addition to low sequence conservation, poor understanding of structural mechanisms driving lincRNA biology hinders systematic prediction of their function. Here, we report the molecular requirements for the recognition of steroid receptors (SRs) by the lincRNA Gas5, which regulates steroid-mediated transcriptional regulation, growth arrest, and apoptosis. We identify the functional Gas5-SR interface and generate point mutations that ablate the SR-Gas5 lincRNA interaction, altering Gas5-driven apoptosis in cancer cell lines. Further, we find that the Gas5 SR-recognition sequence is conserved among haplorhines, with its evolutionary origin as a splice acceptor site. This study demonstrates that lincRNAs can recognize protein targets in a conserved, sequence-specific manner in order to affect critical cell functions.
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