関連する実験動画
Updated: Jun 25, 2026

08:30
RNAi Interference by dsRNA Injection into Drosophila Embryos
Published on: April 11, 2011
A Dicer-2-依存80s複合体は,ドロソフィラのRNAi中に標的mRNAを分割する
John W Pham1, Janice L Pellino, Young Sik Lee
1Department of Biochemistry, Northwestern University, 2205 Tech Drive, Evanston, IL 60208, USA.
Cell
|April 7, 2004
まとめ
研究者は,Drosophila. inのRNA干渉 (RNAi) に関わる3つの複合体 (R1,R2,R3) を特定しました. Dicer-2 (Dcr-2) はそれらの形成に不可欠であり,最終的なホロRISC複合体に統合されます.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- RNA干渉 (RNAi) は重要な遺伝子調節メカニズムである.
- RNA誘発静止複合体 (RISC) の組み立ては,RNAiの機能の鍵である.
研究 の 目的:
- ドロソフィラの小さな干渉RNA (siRNA) によって媒介されるRNA干渉に関与する複合体を生化学的に特徴付ける.
- RISCアセンブリのオーダーされた経路を解明する.
主な方法:
- ネイティブゲル電泳は,タンパク質複合体を分離および分析するために使用されました.
- siRNAsの複合体のインビトロアセンブリが行われました.
主要な成果:
- 3つの異なるsiRNA結合複合体 (R1,R2,R3) が特定されました.
- Dicer-2 (Dcr-2) は,すべての複合体にとって不可欠であり,R1複合体内のsiRNAを直接結合する.
- R3複合体 (80S) はホロRISCを表現し,siRNAを解き放ち,mRNA分裂を媒介する.
結論:
- RISCの組み立てのための有序な生化学的経路が確立されました.
- Dcr-2はHolo-RISCの不可欠な構成要素であり,その役割はイニシアチブを超えて広がっています.
- siRNAは,機能的なRISC複合体を形成するために,Dcr-2と相互作用しなければならない.
関連する概念動画
RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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...
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...
piRNA - 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...
Experimental 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...

