在真核生物中,LENG8调解RNA核保留和降解
Lusong Tian1, Liang Liu1, Yoseop Yoon1
1Department of Microbiology and Molecular Genetics, School of Medicine, University of California, Irvine, Irvine, CA 92617, USA.
bioRxiv : the preprint server for biology
|August 20, 2025
概括
科学家们发现了LENG8,这是一种蛋白质,可以在核中保留有缺陷的RNA. 这防止错误处理的信使RNA (mRNA) 和非编码RNA进入细胞质,确保适当的基因表达.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 在RNA生物学,RNA生物学.
背景情况:
- 细胞具有质量控制机制,可以保留和降解核中的异常RNA.
- 控制核RNA保留和降解的精确分子途径尚未完全阐明.
研究的目的:
- 识别和描述涉及不完全处理和错误处理的RNAs核保留的新型因素.
- 阐明这些因素调节RNA核保留和随后的降解的分子机制.
主要方法:
- 同免疫沉测试以确定蛋白质相互作用.
- 通过RNA免疫沉,然后进行测序 (RIP-Seq) 来映射RNA结合部位.
- 使用siRNA评估LENG8.8功能的耗尽研究.
- 使用光显微镜进行定位研究.
主要成果:
- 确定LENG8是一种保存的核RNA保留因子,通过像U1 snRNP.Np这样的拼接因子被招募到前mRNA中.
- LENG8与PCID2和SEM1一起形成REX (出口抑制剂) 复合体,抑制TREX-2mRNA出口通路.
- LENG8的耗尽导致错误处理的mRNA和非编码RNA的细胞质泄漏.
- 通过招募PAXT和RNA外体,LENG8促进RNA降解.
结论:
- LENG8是保存的真核RNA质量控制途径的关键组成部分.
- 经LENG8介导的途径确保异常RNA的核保留和降解,防止它们被输出到细胞质.
- 这种机制对于保持基因表达的忠实性至关重要,只能通过出口完全加工的RNA来实现.
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