RNAiと抑制タンパク質に基づく調節可能な遺伝子スイッチで,哺乳類の細胞における遺伝子発現を調節する
Tara L Deans1, Charles R Cantor, James J Collins
1Department of Biomedical Engineering, Center for BioDynamics and Center for Advanced Biotechnology, Boston University, Boston, MA 02215, USA.
Cell
|July 31, 2007
まとめ
研究者たちは,哺乳類の細胞における遺伝子発現を正確に制御するための調整可能な遺伝子スイッチを開発した. このシステムは99%以上の遺伝子静止を達成し,遺伝子の活性を微調整することができ,新しい研究分野を可能にします.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝子規制 遺伝子規制
- 合成生物学 合成生物学とは
背景:
- 遺伝子発現の正確な制御は,遺伝子機能を理解し,新しい治療法を開発するために不可欠です.
- 遺伝子サイレンスのための既存の方法は,しばしば調整性または完全な抑圧が欠如しています.
研究 の 目的:
- 哺乳類の細胞における堅牢で調節可能な遺伝子サイレンスのための新しい遺伝子スイッチを設計する.
- レポーター遺伝子,毒素,アポトーシスを誘発する遺伝子を含む様々な遺伝子を調節するシステムの有効性を実証する.
主な方法:
- エンジニアリングされた遺伝子スイッチが設計され,抑制タンパク質とRNA干渉 (RNAi) 標的を組み合わせました.
- スイッチの遺伝子発現を調節する能力は,マウスとヒトの細胞系で強化された緑色光タンパク質 (EGFP) を使用してテストされました.
- システムのモジュラリティとサイレンス機能は,喉毒素とCre recombinaseの発現を制御することによってさらに検証されました.
主要な成果:
- 遺伝子スイッチは99%以上の遺伝子発現抑制を達成しました.
- 遺伝子発現レベルの調整可能な制御が成功裏に実証されました.
- このシステムは,ディフテリア毒素,クレアリコンビナーゼ,およびプロアポプトシス遺伝子の発現を効果的に調節し,アポプトシス誘導のための値応答を明らかにしました.
結論:
- このエンジニアリングされた遺伝子スイッチは,哺乳類のシステムにおける遺伝子発現の厳密かつ調整可能な制御のための強力なツールを提供します.
- このシステムは,遺伝子機能の調査と,遺伝子関連フェノタイプにおける値応答の識別を容易にする.
- この技術は,精密な遺伝子調節を必要とする基礎研究と治療応用の両方に潜在力を秘めています.
関連する概念動画
Types of RNA
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Riboswitches
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.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
Types of RNA
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA Performs Diverse...
RNA Performs Diverse...
Regulation of Expression at Multiple Steps
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 addition of a...
Repressible Operon: trp Operon
The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...
Transcriptional Regulation: Riboswitches
Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...


