生物
RNA剪接
外显子
选择性拼接
外显子跳跃
细胞生物学
SR蛋白
诱导多能干细胞
遗传学
核糖核酸
基因
胚胎干细胞
作者
Nathan K. Leclair,Mattia Brugiolo,Laura M. Urbanski,Shane C. Lawson,Ketan Thakar,Marina Yurieva,Joshy George,J. Travis Hinson,Albert W. Cheng,Brenton R. Graveley,Olga Anczuków
出处
期刊:Molecular Cell
[Elsevier]
日期:2020-11-01
卷期号:80 (4): 648-665.e9
被引量:69
标识
DOI:10.1016/j.molcel.2020.10.019
摘要
The RNA isoform repertoire is regulated by splicing factor (SF) expression, and alterations in SF levels are associated with disease. SFs contain ultraconserved poison exon (PE) sequences that exhibit greater identity across species than nearby coding exons, but their physiological role and molecular regulation is incompletely understood. We show that PEs in serine-arginine-rich (SR) proteins, a family of 14 essential SFs, are differentially spliced during induced pluripotent stem cell (iPSC) differentiation and in tumors versus normal tissues. We uncover an extensive cross-regulatory network of SR proteins controlling their expression via alternative splicing coupled to nonsense-mediated decay. We define sequences that regulate PE inclusion and protein expression of the oncogenic SF TRA2β using an RNA-targeting CRISPR screen. We demonstrate location dependency of RS domain activity on regulation of TRA2β-PE using CRISPR artificial SFs. Finally, we develop splice-switching antisense oligonucleotides to reverse the increased skipping of TRA2β-PE detected in breast tumors, altering breast cancer cell viability, proliferation, and migration.
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