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関連する概念動画

piRNA - Piwi-interacting RNAs02:57

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
RNA Interference01:23

RNA Interference

26.4K
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...
26.4K
Experimental RNAi02:15

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
siRNA - Small Interfering RNAs02:30

siRNA - Small Interfering RNAs

17.0K
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...
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Conservation of Protein Domains Over Different Proteins02:26

Conservation of Protein Domains Over Different Proteins

11.3K
Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
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Small interfering RNAs (siRNA)02:30

Small interfering RNAs (siRNA)

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Updated: Sep 8, 2025

In Situ Detection of Ribonucleoprotein Complex Assembly in the C. elegans Germline using Proximity Ligation Assay
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保存されたPIWIサイレンスコンプレックスは,piRNA-ターゲットのエンゲージメントを検出する.

Dipayan De1, Sucharita Sarkar1, Luca F R Gebert1

  • 1Department of Integrative Structural and Computational Biology, Scripps Research, La Jolla, CA, USA.

Molecular cell
|September 5, 2025
PubMed
まとめ

PIWIタンパク質は 自私的な遺伝要素から 防御するために piRNAs を使用します この研究では,トランポゾンRNAを認識し,分割するPIWI関連複合体が保存され,動物間で重要な防御機構を提供していることが明らかになりました.

キーワード:
GTSF1 についてマエルストームピウィーシウィパイRNAサイレンス転置可能な要素トランポゾン

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Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster
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Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster

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Identification of RNAs Engaged in Direct RNA-RNA Interaction with a Long Non-Coding RNA
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Identification of RNAs Engaged in Direct RNA-RNA Interaction with a Long Non-Coding RNA

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関連する実験動画

Last Updated: Sep 8, 2025

In Situ Detection of Ribonucleoprotein Complex Assembly in the C. elegans Germline using Proximity Ligation Assay
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Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster
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科学分野:

  • 分子生物学
  • 遺伝学
  • 構造生物学

背景:

  • PIWIタンパク質とPIWI相互作用RNA (piRNA) は,動物の生殖細胞における利己的な遺伝要素を静止するために不可欠です.
  • piRNAによるトランポゾン認識がPIWIタンパク質を防御するために活性化する正確なメカニズムは,まだ完全に理解されていません.

研究 の 目的:

  • PIWIタンパク質によるトランポゾン認識と静止の分子機構を解明する.
  • トランポゾンに対するpiRNA媒介防御に関与するタンパク質複合体を特定する.

主な方法:

  • タンパク質とタンパク質の相互作用と酵素活性を特徴付ける生化学的測定
  • 複合体の構造的基礎を決定するための冷凍電子顕微鏡 (冷凍-EM).
  • 進化の保存を評価するための構造的予測

主要な成果:

  • シウィ,GTSF1,マエルストロムを含む新型トランポゾン認識複合体の特定
  • 拡張されたpiRNA-ターゲットペアリングは,GTSF1とMaelstromの採用を可能にするSiwiの特定の構成を誘導することを実証した.
  • 構造分析では,MaelstromとGTSF1が協力してSiwiの内核酵素の活性化を行い,標的RNAの分裂とSpindle-Eの採用につながったことが明らかになった.

結論:

  • この研究は,保存されたPIWI関連複合体 (PIWI*) を,piRNA媒介のトランポゾン防御における重要な効果因子として定義している.
  • このPIWI*の組み立てと活性化のメカニズムは,スポンジから人間まで,メタゾーン全体で保存されています.
  • この発見は,動物が移動性遺伝子要素に対してどのようにゲノムを守るのかを理解するための構造的・メカニズム的枠組みを提供する.