関連する実験動画
Updated: May 23, 2026

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Biotin-based Pulldown Assay to Validate mRNA Targets of Cellular miRNAs
Published on: June 12, 2018
miRNA媒介による遺伝子静止は,翻訳抑制によるもので,その後にmRNAデデエニレーションと衰退が続く
Sergej Djuranovic1, Ali Nahvi, Rachel Green
1Howard Hughes Medical Institute (HHMI) and Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
まとめ
マイクロRNA (miRNA) は,まず翻訳を阻害し,その後メッセンジャーRNA (mRNA) のデデニレーションと衰退を誘発することによって,遺伝子発現を抑制します. この研究は,miRNA媒介による遺伝子サイレンシングの分子メカニズムを明らかにしています.
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
- バイオケミストリー バイオケミストリー
背景:
- マイクロRNA (miRNA) は,遺伝子発現の重要な調節因子である.
- miRNAは,遺伝子静止のために翻訳抑制,mRNAデデニレーション,および衰退を利用します.
- これらの沈黙の出来事の正確な順序は,まだ完全に理解されていません.
研究 の 目的:
- miRNA媒介による遺伝子サイレンシングにおける分子イベントの時間順序を解明する.
- miRNAsが遺伝子発現を調節するメカニズムを定義する.
主な方法:
- ドロソフィラS2細胞ベースの制御可能な発現システムを利用しました.
- トランスレーション,デデニレーション,そして腐敗の動態を研究した.
- 自然な翻訳的伸縮スタールモデルを使用した.
主要な成果:
- miRNAターゲットのmRNAは,最初は翻訳的阻害を受けます.
- トランスレーション阻害の後,mRNAのデデニレーションと分解が観察される.
- サイレンシングは,翻訳の初期段階,おそらくイニシアチブで発生します.
結論:
- miRNA媒介による遺伝子サイレンシングは,mRNAの安定性に影響を及ぼす前に,順次翻訳を阻害する.
- この発見は,miRNAの作用の主な標的として早期の翻訳ステップを特定しています.
- これは,miRNA誘発の遺伝子サイレンシングの分子経路を明確にします.
関連する概念動画
MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
Nonsense-mediated mRNA Decay
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Nonsense-mediated mRNA Decay
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability

