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Biotin-based Pulldown Assay to Validate mRNA Targets of Cellular miRNAs
Published on: June 12, 2018
微RNA参与AU丰富元素介导的mRNA不稳定性
Qing Jing1, Shuang Huang, Sabine Guth
1Department of Immunology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
Cell
|March 16, 2005
概括
微RNA在信使RNA (mRNA) 中向富含AU元素 (AREs) 进行降解. 这一过程涉及Dicer和Argonaute蛋白质,对于调节ARE-mRNA稳定性至关重要.
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:
- 在信使RNA (mRNA) 的3'未翻译区域 (UTR) 中的富含AU元素 (ARE) 是mRNA不稳定性和降解的关键决定因素.
- 特定mRNA的快速衰变,如瘤亡因子-α mRNA,受到AREs的影响,并涉及复杂的调节机制.
- 微RNA (miRNAs) 是小型非编码RNA,它们在转录后调节基因表达,通常通过向mRNA进行降解来调节.
研究的目的:
- 研究RNA干扰 (RNAi) 途径组件在含有ARE的mRNAs (ARE-mRNAs) 衰变中的作用.
- 确定特定的miRNA和相关蛋白质,参与调节ARE-mRNA周转.
- 阐明miRNAs向ARE并影响ARE介导的mRNA降解的机制.
主要方法:
- 在Drosophila S2细胞中进行了基于RNAi的选,以确定涉及ARE-mRNA衰变的因素.
- 证实了Dicer在人类HeLa细胞中ARE-mRNA不稳定的作用.
- 利用序列分析来确定ARE中的潜在miRNA结合位点,并进行实验来评估miRNA依赖的周转率.
主要成果:
- 研究人员发现,Drosophila Dicer1,Argonaute1 (Ago1) 和Ago2对于ARE-mRNAs的快速衰变至关重要.
- 在ARE-mRNA不稳定性中对Dicer的要求在人类细胞中得到了验证.
- 人类miR16被确定为一个关键的miRNA,专门针对ARE序列,需要ARE结合蛋白tristetraprolin (TTP) 进行高效的ARE-RNA循环.
结论:
- 包括Dicer和Argonaute蛋白质在内的RNAi机制在ARE-mRNAs的降解中起着至关重要的作用.
- 针对ARE的miRNA向是一种特定于序列的机制,对于ARE介导的mRNA衰变至关重要.
- 特里斯特拉普罗林 (TTP) 通过与阿尔戈诺特蛋白相互作用,与miR16复合,从而促进ARE向,从而促进ARE-RNA循环.
相关概念视频
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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...

