Control of mRNA splicing by noncoding intragenic RNA elements that evoke a cellular stress response.
Control of mRNA splicing by noncoding intragenic RNA elements that evoke a cellular stress response.
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通过引发细胞应激反应的非编码基因内 RNA 元件控制 mRNA 剪接
DOI:
10.1016/j.biocel.2018.09.021
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Kaempfer
中科院分区:
文献类型:
--
作者:
Kaempfer
Once activated by double-helical RNA, mammalian RNA-dependent stress protein kinase, PKR, phosphorylates its substrate, translation initiation factor eIF2α, to inhibit translation. eIF2α phosphorylation is critical for mounting a cellular stress response. We describe short, 100–200 nucleotide elements within cellular genes that, once transcribed, form RNA structures that potently activate PKR in the vicinity of the RNA and thereby tightly regulate gene expression in cis. Intragenic RNA activators of PKR can (a) attenuate translation of the encoded mRNA by activating PKR and inducing eIF2α phosphorylation, exemplified by the IFN-γ gene, or (b) greatly enhance mRNA splicing efficiency by activating PKR and inducing nuclear eIF2α phosphorylation, thus enabling efficient early spliceosome assembly, exemplified by the adult and fetal globin genes and the TNF-α gene that activates PKR through an RNA pseudoknot conserved from fish to humans. These opposite outcomes considerably extend the potential scope of gene regulation by these novel RNA elements.
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