JP2015532593A - pH感受性色素を使用する増幅反応産物の検出 - Google Patents
pH感受性色素を使用する増幅反応産物の検出 Download PDFInfo
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- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6844—Nucleic acid amplification reactions
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- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
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Abstract
Description
pH感受性視覚的色素を使用するLAMP増幅の検出
LAMP反応は、バッファーなし反応溶液:10mM (NH4)2SO4、50mM KCl、8mM MgSO4、1.4mM dNTP、0.1% Tween−20、pH7.5から10、により実行した。最終バッファー濃度は、酵素保存バッファーキャリーオーバー由来の0.026mMから0.4mM Trisであった。
pH感受性視覚的色素を使用するPCR増幅の検出
PCR反応は、25μl中、500nMのそれぞれpAII17プラスミドDNA由来の1.287kb断片を増幅するフォワードおよびリバースプライマー、400μΜのそれぞれの4つのdNTP、100μΜフェノールレッド、0.025μlの1M KOH、1.875UのTaq DNAポリメラーゼを使用して、50mM KClおよび2.25mM MgCl2中で実行した。PCR反応は、2分間95℃、36サイクルの10秒間95℃、15秒間62℃、30秒間68℃で実行した。PCRサイクリング前に、DNA鋳型ありまたはなしのチューブはすべて、同じ淡紅色を有した。PCR反応の終了時に、DNA鋳型を有した三通りの反応(1、2および3と標識;図5)が淡紅色から黄色に色を変化させたが、DNA鋳型なしの反応液(4、5および6と標識;図5)は、淡紅色のままであった。鋳型を含有する反応におけるDNA合成は、リアルタイムPCRマシンおよびアガロースゲル電気泳動法を使用して確認した。従って、色変化は、PCR反応の成功についての信頼できる視覚的な指示薬をもたらした。プライマー配列は、以下の通りであった。
細菌コロニーにおけるプラスミドDNAの視覚的な検出
PCR反応は、特異的なプラスミドDNAを持つように形質転換された大腸菌コロニーを同定するために、フェノールレッドの存在下において実行した。それぞれのコロニーのほんの一部を10μl水中に懸濁し、1μlをPCR反応に追加し、PCR反応を実施例2において記載されるように実行した。6つのコロニーについて、ポジティブコントロール(+)において使用されるものと同じプラスミドを持つプレート由来の3つのコロニー(1から3)および無関係なプラスミドを含有する細菌プレート由来の3つのコロニー(aからc)で試験した。ポジティブコントロールにおいてのように、標的プラスミドDNAを含有したチューブは、淡紅色から黄色に色を変化させた(図6)。無関係なプラスミドを含有するチューブは、ちょうど、いかなる鋳型も有していないチューブ(−)のように淡紅色のままであった。従って、これらのPCR反応における色変化は、特異的なプラスミドDNAを含有するコロニーの決定を可能にした。このアプローチは、厄介で、時間のかかる、PCR増幅を決定するためにアガロースゲル電気泳動法を使用する従来のステップを回避した。
pH感受性視覚的色素を使用するSPA増幅の検出
SDA反応は、バッファーなし反応溶液:8mM MgSO4、50mM KCl、10mM (NH4)2SO4、0.4mM dATP、0.4mM dGTP、0.4mM dTTP、0.8mM 2’−デオキシシチジン−5’−O−(1−チオトリホスフェート)(dCTP−αS;TriLink BioTechnologies、San Diego、CA)、0.5μΜ SDAプライマー、0.2U/μl BsoBI(New England Biolabs、Ipswich、MA)、0.32U/μl Bst 2.0、pH8.8中で実行した。最終バッファー濃度は、酵素保存バッファーキャリーオーバー由来の0.23mM Trisであった。プライマー配列は、ヒトBRCA1について設計し、BsoBI制限部位を含有した。反応は、図7Aおよび図Bにおいて示されるように、100μΜ pH感受性色素の存在下において65℃で60分間、インキュベートし、Bst 2.0 DNAポリメラーゼを含有する反応のみが色を変化させた。これは、pH減少に基づく増幅の検出の成功を示した。プライマー配列は、以下の通りであった。
pH感受性蛍光色素を使用するLAMP増幅の検出
LAMP反応は、ラムダ(図8Aから図8C)またはCFTR(図9Aから図9C)プライマーを使用して、実施例1におけるように、バッファーなし溶液中で実行した。pH感受性蛍光色素BCECF−AM(2μΜ)およびSNARF−1(10μΜ)を、pHの減少を介して増幅をレポートするために使用した。蛍光測定は、FAMチャネル、BCECF−AM;ROXチャネル、SNARF−1高pH形態;HEXチャネル、SNARF−1低pH形態に対応する色素スペクトルによりCFX−96リアルタイム蛍光計を使用して実行した。蛍光の損失(BCECF−AMおよびSNARF−1高pH形態)または蛍光の増加(SNARF−1低pH形態)によって測定されるpHの減少は、図8Aから図8Cにおいて示されるように、増幅反応に対して特異的であり、DNAポリメラーゼを欠く反応は、バックグラウンドにおける有意な変化を示さなかった。蛍光変化までの時間は、急速であり(<10分間)、LAMP反応の能率およびスピードを示した。検出はまた、図9Aから図9Cにおいて示されるように定量的でもあり、段階希釈HeLa標的DNA量の間で明らかな差異があった。
pH感受性蛍光色素を使用するPCR増幅の検出
3つのペアのプライマーを、異なるサイズのアンプリコンを増幅するために使用した。309bpおよび1287bp(pAII17プラスミドDNA由来)ならびに114bp(大腸菌ゲノムDNA由来)のアンプリコンは、10μΜ pH感受性蛍光色素SNARF−1を視覚的色素フェノールレッドの代わりに反応に含めた以外は、実施例2におけるように実行したPCR反応において使用した。蛍光測定値は、CFX96マシンのROXチャネルで記録した。記録されたシグナルの著しい低下は、PCRサイクリングの間にDNA鋳型を含有する反応において観察された(図10A)。Taq DNAポリメラーゼまたはDNA鋳型を含有しなかった反応(ネガティブコントロール)は、熱サイクル由来のpH変化と同じ速度でゆっくりと減少した。ネガティブコントロールからシグナルを差し引いた後に、鋳型を有する反応は、図10Bにおける劇的なシグナル減少を示した。シグナル低下のレベルは、アンプリコンサイズに比例した。この実施例は、pH感受性蛍光色素が、リアルタイムでPCR反応をモニターするために使用することができることを実証した。上記に列挙される1287bpプライマーに加えて、プライマー配列は以下の通りであった。
Claims (15)
- 1mM未満のTrisもしくは等価物の量で弱い緩衝剤を含有するまたは緩衝剤なしの調合物中に、pH感受性色素、DNAポリメラーゼ、dNTPを含む調製物。
- プライマーをさらに含む、請求項1に記載の調製物。
- 鋳型DNAをさらに含む、請求項1または2に記載の調製物。
- pH感受性色素が、視覚的に検出可能な有色色素または蛍光色素のいずれかである、請求項1から3のいずれかに記載の調製物。
- 核酸の増幅を検出するための方法であって、
弱緩衝または非緩衝液中に鋳型DNA、DNAポリメラーゼおよびpH感受性色素を含有する増幅反応混合物を提供するステップならびに
標的DNAの増幅から結果として生じる色素のスペクトルまたは蛍光特性における変化を検出するステップ
を含む、方法。 - 増幅が、等温核酸増幅またはポリメラーゼ連鎖反応を含む、請求項5に記載の方法。
- 等温核酸増幅が、ループ媒介性等温増幅、ヘリカーゼ置換増幅、鎖置換増幅、レコンビナーゼポリメラーゼ増幅またはニッキング酵素増幅反応である、請求項5または6に記載の方法。
- 色素が、可溶性である、請求項7に記載の方法。
- 可溶性色素が、可視光線において検出可能な有色色素である、請求項7または8に記載の方法。
- 色素が、クレゾールレッド、フェノールレッド、m−クレゾールパープル、ブロモクレゾールパープル、ニュートラルレッド、ナフトールフタレイン、チモールブルー、ナフトールフタレインから選択される、請求項7から9のいずれかに記載の方法。
- 色素が、蛍光色素である、請求項8に記載の方法。
- 蛍光色素が、2’,7’−ビス−(2−カルボキシエチル)−5−(および−6)−カルボキシフルオレセインまたはカルボキシルセミナフトロダフルオルである、請求項11に記載の方法。
- 弱緩衝液が、1mM未満のTrisバッファーまたは等価なバッファーを含む、請求項5から12のいずれかに記載の方法。
- 増幅反応の前から後まで、pH感受性色素のスペクトルまたは蛍光特性における変化を比較するステップをさらに含む、請求項5から13のいずれかに記載の方法。
- 標的配列がサンプル中に存在する場合に、標的配列の核酸増幅をモニターするための方法であって、増幅がサイクルの閾値数を超えて進むにつれて、標的配列の存在化においてpHの変化をモニターするステップを含み、モニターするステップが、pH感受性の有色色素または蛍光色素を反応混合物に追加することと、増幅前と比較した、増幅が起こった場合の色の変化を決定することによって達成される、方法。
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EP2888374A4 (en) | 2016-03-16 |
EP2888374B1 (en) | 2017-08-02 |
US20150240293A1 (en) | 2015-08-27 |
US9034606B2 (en) | 2015-05-19 |
CN104937108B (zh) | 2018-05-15 |
EP2888374A1 (en) | 2015-07-01 |
US20140057268A1 (en) | 2014-02-27 |
US9580748B2 (en) | 2017-02-28 |
CN104937108A (zh) | 2015-09-23 |
WO2014031783A1 (en) | 2014-02-27 |
JP6831628B2 (ja) | 2021-02-17 |
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