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CAR-SPLASH识别出涉及动态合和替代拼接的新生mRNA前结构
Hossein Shenasa1, Nova Fong1, Benjamin Erickson1
1RNA Bioscience Initiative, Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine, Aurora, CO 80045.
概括
研究人员发现了RNA结构,称为"RNA动态开关",控制mRNA前拼接. 用反感性寡核酸破坏这些开关会改变替代拼接结果,揭示了转录和拼接之间的动态合机制.
科学领域:
- 分子生物学分子生物学
- 在RNA生物学,RNA生物学.
- 基因规则 基因规则
背景情况:
- 前信使RNA (前mRNA) 拼接与转录发生动态合,转录速度影响替代拼接 (AS) 结果.
- 这种运动合背后的精确分子机制尚未完全理解.
- 一个拟议的机制涉及新生的前mRNA的延长率依赖的替代折叠.
研究的目的:
- 为了研究新生的前mRNA中的RNA结构,这些结构可能会调节动力合到拼接.
- 识别和描述控制替代拼接的新型监管要素.
- 探索针对这些结构的潜力,用反意义寡核酸 (ASO) 来进行拼接调制.
主要方法:
- 修改松烯交联,结合和选择混合体 (SPLASH) 到染色质关联RNA (CAR) -SPLASH的测序.
- 将CAR-SPLASH应用于具有野生类型和缓慢突变RNA聚合酶II的细胞.
- 使用反感性寡核酸 (ASO) 破坏已识别的RNA复合体.
主要成果:
- 在新生的前mRNA中识别了3000多个分子内RNA复合体,其中400多个位于结合点附近.
- 通过ASO介导的特定双重点的破坏,称为"RNA动态开关",显著影响了替代拼接.
- 这些对NISCH,GAK和MEGF8外型的AS的影响取决于转录延长率.
结论:
- RNA动态开关通过调节新生的RNA结构折叠来调节转录和剪接之间的动态合.
- 转录速度影响RNA折叠,这反过来影响了替代拼接结果.
- 新生RNA结构代表了拼接修饰ASO的潜在目标.
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