相关实验视频
Updated: Jul 8, 2026
08:30
RNAi Interference by dsRNA Injection into Drosophila Embryos
Published on: April 11, 2011
在siRNA/miRNA沉默通路中,Drosophila Dicer-1和Dicer-2具有不同的作用
Young Sik Lee1, Kenji Nakahara, John W Pham
1Department of Biochemistry, Northwestern University, 2205 Tech Drive, Evanston, IL 60208, USA.
Cell
|April 7, 2004
概括
德罗斯菲拉的Dicer-1和Dicer-2酶对于RNA干扰 (RNAi) 是至关重要的. 突变发现Dicer-1对于微RNA (miRNA) 处理和翻译抑制至关重要,而Dicer-2对于小干扰RNA (siRNA) 处理至关重要.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 在RNA干扰过程中,RNA干扰
背景情况:
- 迪克酶是必不可少的RNase III核酶,它将双链RNA加工成小调节性RNA.
- 小干扰RNAs (siRNAs) 和microRNAs (miRNAs) 指导RNA诱导沉默复合体 (RISC) 通过mRNA裂变或转化抑制进行基因沉默.
- 果虫Dicer-1和Dicer-2已被确定为siRNA依赖RISC (siRISC) 的组成部分.
研究的目的:
- 描述DrosophilaDicer-1和Dicer-2在RNA干扰途径中的不同作用.
- 阐明Dicer-1和Dicer-2在siRNA-RISC (siRISC) 和miRNA-RISC (miRISC) 的组装和活性中的特定功能.
主要方法:
- 对Drosophila dicer-1和dicer-2突变等位基因的基因分析.
- 评估小RNA前体的加工.
- 在siRNA指导的mRNA裂变和miRNA指导的翻译抑制中对Dicer蛋白需求的调查.
主要成果:
- 在dicer-1的突变特别损害了miRNA前体的处理.
- dicer-2突变体在siRNA前体处理中表现出缺陷.
- 对于siRNA指导的mRNA裂变,Dicer-1和Dicer-2都需要,但Dicer-2的RNase III活性对于这个过程并不重要.
- Dicer-1和Dicer-2参与siRISC组装的不同阶段.
- Dicer-1,但不是Dicer-2,对于miRISC介导的翻译压制至关重要.
结论:
- 多菌Dicer-1和Dicer-2在miRNA和siRNA路径中分别发挥着不同的和必不可少的作用.
- siRISCs和miRISCs在其组成和依赖Drosophila中的Dicer蛋白质方面表现出根本的差异.
- 这些发现突出了Dicer对应物在通过RNA干扰调节基因表达方面的专门功能.
相关概念视频
01:23RNA 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...
01:23RNA 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...
02:30siRNA - 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...
02:57piRNA - Piwi-interacting RNAs
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...
02:15Experimental RNAi
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...
02:30Small interfering RNAs (siRNA)
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...