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Updated: Jun 19, 2026

09:05
MicroRNA-based Regulation of Picornavirus Tropism
Published on: February 6, 2017
有效的RNAi介导基因沉默,而不会中断内源微RNA路径
Matthias John1, Rainer Constien, Akin Akinc
1Alnylam Europe AG, Fritz-Hornschuch-Str. 9, 95326 Kulmbach, Germany.
Nature
|September 28, 2007
概括
合成小干扰RNAs (siRNAs) 的系统性管理有效地使肝脏中的基因沉默,而不会影响自然的microRNA (miRNA) 途径. 这项研究支持合成siRNA作为动物研究中基因沉默的安全治疗工具.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物技术是生物技术.
背景情况:
- 合成小干扰RNAs (siRNAs) 的系统注射是一种经过验证的方法,可以在各种物种的肝细胞中沉默基因表达.
- 一个关键的问题仍然是,通过合成siRNA进行体内基因沉默是否可以干扰内源微RNA (miRNA) 途径.
研究的目的:
- 为了研究系统合成siRNA给药对内源性miRNA水平和活体活性的影响.
- 评估合成siRNA在动物模型中用于基因沉默的安全性和有效性,而不会破坏miRNA路径.
主要方法:
- 给小鼠和仓鼠注射了针对特定肝细胞基因 (阿波利波蛋白B,因子VII,Scap) 的合成siRNA.
- 测量了信使RNA (mRNA) 沉默效率.
- 固有的miRNAs (miR-122,miR-16,let-7a) 的水平和活性在siRNA给药后进行了评估.
主要成果:
- 在小鼠和仓鼠肝脏中,系统性siRNA的使用实现了高效的基因沉默 (目标mRNA的约80%).
- 肝细胞表达的关键miRNAs (miR-122,miR-16,let-7a) 的水平或活性没有显著变化.
- 长期的mRNA沉默在重复的siRNA给药下在没有影响miR-122水平的情况下在仓鼠中实现.
结论:
- 合成的siRNA可以有效地使肝脏中的基因表达沉默,而不会破坏内源的miRNA途径.
- 这项研究验证了合成siRNA在临床前动物研究中作为基因沉默的安全和有效工具.
- 这些发现支持利用合成siRNA的RNA干扰疗法的持续发展.
相关概念视频
MicroRNAs
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This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
siRNA - Small Interfering RNAs
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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...

