関連する実験動画
Updated: Jul 16, 2026

09:39
Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster
Published on: August 21, 2014
ドロソフィラのリピートアソシエートされたsiRNA 5'エンド形成のためのスライサー媒介メカニズム
Lalith S Gunawardane1, Kuniaki Saito, Kazumichi M Nishida
1Institute for Genome Research, University of Tokushima, Tokushima 770-8503, Japan.
まとめ
ドロソフィラの反復関連小干渉RNA (rasiRNA) は,レトロトランポゾンを静止する鍵となる. 感覚鎖から派生したAGO3関連 rasiRNAsは,補完的な相互作用を通じてPIWI媒介の静止を誘導する.
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
- RNA 生物学 RNA 生物学
背景:
- ドロソフィラの生殖系統は,Dicer独立経路を通じて,繰り返し関連小干渉RNA (rasiRNAs) を生成する.
- Aubergine (Aub),Piwi,およびAGO3を含むPIWIサブファミリーのアルゴナウトは,ラシRNAを使用してレトロトランポゾンサイレンスを媒介する.
研究 の 目的:
- PIWIサブファミリーのメンバーであるAGO3.3に関連した小型のRNAを特徴づける.
- ラシRNA生物発生のメカニズムと,ドロソフィラの生殖線静止における機能を解明する.
主な方法:
- AGO3.3に関連した小型のRNAの配列決定.
- AGO3-,Aub-,およびPiwiに関連したラシRNAの比較分析.
- AubとAGOのSlicer活性アッセイをインビトロスライサー3.
主要な成果:
- AGO3に関連した rasiRNAは,主にAubとPiwiに関連した rasiRNA (アンチセンセ) とは異なり,レトロトランポソンの感覚鎖から発生します.
- AGO3のラシRNAは,核酸10でアデニンを好むが,Aub/PiwiのラシRNAは,5'端でウラシルを好む.
- AGO3-とAub関連 rasiRNAsの5'端の間に補完性が観察されました.
- AubとAGO3の両方,Slicerの活性性をin vitroで実証しました.
結論:
- 配線バイアス型ラシRNA生成とPIWIスライサーの活動が連携してラシRNA前駆体処理を導くモデルが提案されています.
- このメカニズムは,ドロソフィラの生殖系における移植可能な要素の効果的な静止を保証します.
関連する概念動画
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...
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...
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...
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...
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 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...

