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Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
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PCR01:32

PCR

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Overview
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RACE - Rapid Amplification of cDNA Ends02:35

RACE - Rapid Amplification of cDNA Ends

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Rapid Amplification of cDNA Ends, or RACE, is one of the most effective methods to obtain a full-length cDNA from an mRNA sequence between a known internal region to the unknown sequence at the 5’ or 3’ end. The unknown region is cloned in the cDNA by a gene-specific primer that binds the known end, and a hybrid primer that attaches a predefined anchor sequence to the unknown end of the cDNA. The sequence in between is amplified by PCR with an anchor primer and a gene-specific...
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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Proofreading01:31

Proofreading

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Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase...
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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Rapid, Enzymatic Methods for Amplification of Minimal, Linear Templates for Protein Prototyping using Cell-Free Systems
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ローリングサークル-DNA酵素フィードバックプログラミングによる自律的指数関数増幅

Jinhua Shang1, Mengdi Yu1, Yifei Wang1

  • 1College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.

Journal of the American Chemical Society
|November 26, 2025
PubMed
まとめ
この要約は機械生成です。

この研究では,感度向上のために自己再生するプライマーを使用する新しい核酸検出方法である指数関数回転円増幅 (E-RCA) が導入されています. このDNAベースのシステムは 生物学的および臨床的な応用のために プログラム可能で自律的な分子分析を提供します

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DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
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Linear Amplification Mediated PCR &#8211; Localization of Genetic Elements and Characterization of Unknown Flanking DNA
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Linear Amplification Mediated PCR – Localization of Genetic Elements and Characterization of Unknown Flanking DNA

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関連する実験動画

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Rapid, Enzymatic Methods for Amplification of Minimal, Linear Templates for Protein Prototyping using Cell-Free Systems
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DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
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Linear Amplification Mediated PCR &#8211; Localization of Genetic Elements and Characterization of Unknown Flanking DNA
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Linear Amplification Mediated PCR – Localization of Genetic Elements and Characterization of Unknown Flanking DNA

Published on: June 25, 2014

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科学分野:

  • 分子生物学
  • バイオテクノロジー
  • 生物化学

背景:

  • ローリングサークル増幅 (RCA) は,敏感な同熱核酸検出方法である.
  • 伝統的なRCAは,線形運動学と外部プライマーへの依存により,感度とプログラム性の制限があります.

研究 の 目的:

  • 強化された核酸検出のための指数関数RCA (E-RCA) プラットフォームを開発する.
  • プライマー再生と信号増幅を 単一のDNAコードシステムに統合する

主な方法:

  • RCA中のプライマーの再生のために,自己分裂DNA酵素配列を持つ円形のDNAテンプレートを設計した.
  • 外部プライマーやタンパク質酵素を使わずに増幅するために DNAポリメラーゼを使用した.
  • E-RCAシステムを複合細胞内マイクロRNA画像と乳がん組織プロファイリングで検証した.

主要な成果:

  • 自給自足 (RCA DNAzyme) 回路を通じて指数関数的な信号増幅を達成した.
  • 臨床サンプルで高い診断精度 (AUC=0. 914,特異性=100%,感度=81. 3%) を実証した.
  • 複合細胞内マイクロRNAイメージングと二重マーカープロファイリングが成功しました.

結論:

  • E-RCAプラットフォームは,敏感でプログラム可能で自律的な分子分析を提供します.
  • このDNAベースの戦略は,先進的な生物学的および臨床的な応用のための伝統的なRCAの限界を克服します.