通过DICER产生小RNA的序列决定因素
Young-Yoon Lee1,2, Haedong Kim1,2, V Narry Kim3,4
1Center for RNA Research, Institute for Basic Science (IBS), Seoul, Republic of Korea.
Nature
|February 22, 2023
概括
研究人员发现了一个新的序列元素,GYM动机,指导Dicer酶在RNA沉默中的活动. 这一发现增强了对微RNA处理的理解,并对开发RNA疗法产生影响.
科学领域:
- 分子生物学
- 遗传学
- 生物化学
背景情况:
- 通过Dicer酶调节的RNA沉默对基因调节至关重要.
- 迪克将双链RNA加工成微RNA (miRNA) 和小干扰RNA (siRNA).
- 之前的Dicer特异性理解集中在基质结构上,而不是依赖序列的元素.
研究的目的:
- 确定Dicer特异性的新型依赖序列的决定因素.
- 研究序列元素在前体miRNA (前miRNA) 处理中的作用.
- 探索这些因素对RNA干扰疗效和治疗设计的影响.
主要方法:
- 使用miRNA前变体和人类DICER (DICER1) 的大规模并行测试.
- 对前miRNA的序列和结构特征的系统查询.
- 对DICER的C端双链RNA结合域 (dsRBD) 相互作用的分析.
主要成果:
- 在Dicer裂附近发现了一种保存的"GYM图案" (配对的G,配对的pyrimidine,不匹配的C或A).
- GYM图案要求精确的处理,并可以取代现有的"规则"机制.
- 整合GYM基因增强了RNA干扰;与癌症相关的突变损害了基因识别.
结论:
- 发现了一种新的依赖序列的识别原理.
- GYM图案是Dicer基质特异性和加工的一个关键决定因素.
- 了解GYM动机及其与DICER的dsRBD的相互作用为RNA治疗设计提供了潜力.
相关概念视频
RNA Interference
26.2K
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...
26.2K
siRNA - Small Interfering RNAs
16.9K
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...
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...
16.9K
Experimental RNAi
6.2K
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...
6.2K
Small interfering RNAs (siRNA)
3.6K
3.6K
piRNA - Piwi-interacting RNAs
7.0K
PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
7.0K
Translational Regulation
58
Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
58


