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MicroRNAs01:22

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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...
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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...
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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...
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
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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.
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遺伝子発現の精密かつ調整可能な制御のためのmiRNAモジュール

Rongrong Du1, Michael J Flynn1, Karan Mahe1

  • 1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA; Howard Hughes Medical Institute, California Institute of Technology, Pasadena, CA 91125, USA.

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まとめ

研究者らは、精密なトランスジーン発現制御のためのDIMMERと呼ばれる新しいmiRNAベースの回路を開発しました。これらのレギュレーターは、遺伝子投与量の変動にわたって均一なタンパク質レベルを保証し、遺伝子治療およびバイオテクノロジー研究を進歩させます。

キーワード:
線量補償遺伝子治療マイクロRNA多特異的調節精密遺伝子発現制御合成生物学

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科学分野:

  • バイオテクノロジー
  • 分子生物学
  • 合成生物学

背景:

  • 正確なトランスジーン発現制御は、研究および治療アプリケーションに不可欠です。
  • miRNAベースのレギュラトリー回路は、強化されたトランスジーン制御の可能性を提供します。
  • miRNA回路設計原則とパフォーマンス制限の体系的な理解が不足しています。

研究 の 目的:

  • miRNAベースの回路モジュール（「用量不変miRNA媒介発現レギュレーター」（DIMMER）と呼ぶ）を導入および特徴付けること。
  • 多様な細胞タイプにわたるトランスジーン発現の精密かつ調整可能な制御を確立すること。
  • イメージング、遺伝子編集、遺伝子治療における応用を探求すること。

主な方法:

  • 計算モデリングと実験的検証を組み合わせました。
  • トランスジーン回路内の多価miRNA調節相互作用を設計しました。
  • 異なる細胞タイプと遺伝子投与量にわたる回路パフォーマンスをテストしました。

主要な成果:

  • DIMMERは、2桁の遺伝子投与量の変動にもかかわらず、ほぼ均一で調整可能なタンパク質発現を達成します。
  • 回路は多様な細胞タイプで機能を示し、独立した遺伝子調節のための多重化を可能にします。
  • DIMMERは、オフターゲットのCRISPR塩基編集を正常に削減し、単一分子イメージングを改善し、AAV送達トランスジーンのライブ追跡を可能にしました。

結論:

  • DIMMERは、精密かつ調整可能なトランスジーン発現制御のための堅牢なプラットフォームを提供します。
  • これらのレギュラトリー回路は、研究、バイオテクノロジー、遺伝子治療に広く適用できます。
  • DIMMERは、現在のトランスジーン発現制御方法の制限を克服します。