JP4360904B2 - 単一ヌクレオチドの増幅およびポリメラーゼによる検出 - Google Patents
単一ヌクレオチドの増幅およびポリメラーゼによる検出 Download PDFInfo
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Description
本出願は、2001年8月29日に出願した、米国仮出願第60/315,798号の表題35§119(e)の下で優先権の恩典を主張する。
本発明は、DNAポリメラーゼのための基質として非−加水分解可能なプライマーおよび末端−ホスフェート−標識ヌクレオチドの使用に基づいて、試料中でポリヌクレオチドを検出して特徴づけする方法に一般的に関する。本発明はさらに、標的ポリヌクレオチドにおける特異的ヌクレオチド塩基の突然変異を検出する方法に関する。使用される標識は、酵素で活性化可能であって、化学発光の、蛍光性の、電気化学的なおよび発色性の部分ならびに質量タグを含む。
高度の特異性および感度を持って試料中で特異的な核酸もしくはアナライトを検出する方法は公知である。核酸配列間の相補性に基づいている分析方法は、遺伝子の特性の直接分析を可能とする。これは、遺伝子の障害もしくは正常細胞のがん性変化を確認する非常に有用な手段を提供する。
本発明の態様は、ポリヌクレオチドを検出する方法を提供することであって、その中では、DNAに作用する3'→5'DNAエキソヌクレアーゼが、標的ヌクレオチドからのシグナルが増幅されて、標識出発原料から標識生成物を分離する必要無しに検出され得るように、DNA反応ポリメラーゼおよびホスファターゼと一緒に用いられる。
本明細書中で定義される際には、用語“ヌクレオシド”とは、炭素環式のもしくは非環式のリンカーのような、糖または糖代用品に結合したプリン、デアザプリン、ピリミジンまたは修飾塩基を、1'位置または同等な位置に含む化合物であって、2'−デオキシおよび2'−ヒドロキシル、2',3'−ジデオキシ形ならびに他の置換を含む。
により表され得る。
3'TTGGTAG5'
ハイブリッドは以下のように形成され得る。
実施例1
δ−9H(1,3−ジクロロ−9,9−ジメチルアクリジン−2−オン−7−イル)−ジデオキシチミジン−5'−四リン酸(ddT4P−DDAO)の作成
ddTTP(80mM溶液100μl)を無水のジメチルホルムアミド(DMF、2×1ml)と共に共蒸発した。これに、ジシクロヘキシルカルボジイミド(8.3mg、5当量)を加えて、混合液を再び無水のDMF(1ml)と共に共蒸発した。残渣を無水のDMF(1ml)中に取って、反応液を終夜室温で攪拌した。HPLCはほとんど環化したトリホスフェート(約82%)を示した。反応混合液を濃縮して、残渣を無水のジエチルエーテルで3回洗浄した。それを無水のDMF中に再溶解して、ロータリーエバポレーター上で濃縮乾固した。残渣を無水のDMF200μl中のDDAO−一リン酸、アンモニウム塩(5mg、1.5当量)と共に取って、週末にかけて40℃で攪拌した。HPLCは、11.96分に望ましいUV特色を持つ新しい生成物の形成を示した。(HPLC方法:15分間で0.1M酢酸トリエチルアンモニウム(pH7)中の0〜30%アセトニトリル、5分間で30〜50%アセトニトリル、NovapakC18 3.9×150mmカラム、1ml/分)。LCMS(ES−)はまた、M−1ピークとして主要質量ピーク834を示した。反応混合液を濃縮して、DeltapakC18 19×300mmカラム上で0.1M TEAB(pH6.7)およびアセトニトリルを用いて精製した。生成物を持つフラクションを上で説明したのと同一の方法を用いるHPLCにより再精製した。純粋な生成物を持つフラクションを濃縮して、MeOH(2回)および水(1回)と共に共蒸発した。残渣を水(1.2ml)中に溶解すると、1.23mMの溶液を与えた。HPLC純度:254nmにおいて>97.5%、455nmにおいて>96%;UVλA=267nmおよび455nm;MS:M−1=834.04(計算値833.95)。
γ−(7−ヒドロキシ−3H−フェノキサジン−3−オン)ddGTP(γ−レゾルフィン−ddGTP)の作成
ddGTP(86.7mM溶液125μl、10.8μmol)を無水のDMF(3×0.25ml)と共に共蒸発した。これに、DCC(5当量)を加えて、混合液を再び無水のDMF(0.25ml)と共に共蒸発した。残渣を無水のDMF(1ml)中に取って、反応液を室温で週末にかけて攪拌した。レゾルフィン(20当量)を無水のDMF(2×1ml)と共に共蒸発して、上の環化工程からのddGTPトリメタリン酸に引き続いてトリエチルアミン20当量を加えた。2週間後に、反応混合液をロータリーエバポレーター上で濃縮し、そして残渣を水(3×1ml)で抽出して、ろ過した。ろ液を、Xterra RP C18(19×100mm)カラム上で、0.1M重炭酸トリエチルアンモニウム(pH6.7)中の0〜30%アセトニトリルを5カラム容積でおよび30〜50%アセトニトリルを1カラム容積で用いて精製した。純粋なフラクションをロータリーエバポレーター上で濃縮して、メタノール(2×5ml)と共に共蒸発した。残渣を水(1.5ml)中に溶解すると、0.5mMの溶液を与えた。HPLC純度:260nmにおいて>98%、470nmにおいて>97.5%;UV/VIS=251および472nm;MS:M−1=685.10(計算値685.03)。
末端−ホスフェート上に蛍光原色素で標識したヌクレオチドの組み込みにより生成したシグナルを増幅するためにエキソヌクレアーゼIIIの使用
25mMトリスHCl、pH8.0、5mM MgCl2、0.5mM MnSO4、40ピコモルのddT4P−DDAO(DDAO−δ−2',3'−ジデオキシチミジン−5'−四リン酸)、5ピコモルのプライマー(5'GTTTTCCCAGTCACGACGTTGT*A3'(配列番号1)[式中、*はホスホロチオエート結合である]および10ピコモルの鋳型(5'GTCGTTATACAACGTCGTGACTGGGAAAA*ddC3'(配列番号2)[式中、*はホスホロチオエート結合であり、ddCは末端ジデオキシヌクレオチドを示す])を含有する反応液50μlを、4分間75℃で加熱することによりアニールして、21℃に冷却した。今や図2を参照して、この反応液に以下を加えた:エビアルカリ性ホスファターゼ0.15単位およびエキソヌクレアーゼIII(四角)0.5単位もしくはエビアルカリ性ホスファターゼ0.15単位、エキソヌクレアーゼIII0.5単位ならびにThermo Sequenase(円)16単位である。第三の反応混合液に、エビアルカリ性ホスファターゼ0.15単位およびThermo Sequenase16単位を加えて、次いで10分後に (三角)を加えた。612nmにおける励起および670nmにおける放射により時間ドライブモードで運転される、LS−55ルミネセンス分光計(Perkin Elmer)の中の石英蛍光超微小キュベット中で、反応液を室温でインキュベートした。放射は任意の単位で表示される。
末端−ホスフェート上に配列特異性を持つ蛍光原色素で標識したヌクレオチドの配列特異的組み込みにより生成したシグナルを増幅するためにエキソヌクレアーゼIIIの使用
図3Aを参照して、アッセイを実施して、鋳型中のデオキシシチジン(C)の存在を決定した。図3Aに示されたそれぞれの結果について、25mMトリスHCl、pH8.0、5mM MgCl2、0.5mM MnSO4、40ピコモルのddG3P−レゾルフィン(レゾルフィン−δ−2',3'−ジデオキシグアノシン−5'−三リン酸)、5ピコモルのプライマー(5'GTTTTCCCAGTCACGACGTTGT*A3'(配列番号1)[式中、*はホスホロチオエート結合である]および10ピコモルの鋳型(5'GTCGTTATACAACGTCGTGACTGGGAAAA*ddC3'(配列番号3)[式中、*はホスホロチオエート結合であり、ddCは末端ジデオキシヌクレオチドを示す])を含有する反応液50μlを、4分間75℃で加熱することによりアニールして、21℃に冷却した。かくして、図3Aについて、プライマー/鋳型の組合せは:
5' GTTTTCCCAGTCACGACGTTGTA (配列番号1)
ddCAAAAGGGTCAGTGCTGCAACATCTTGCTG (配列番号3)
であった。
5' GTTTTCCCAGTCACGACGTTGTA (配列番号1)
ddCAAAAGGGTCAGTGCTGCAACATCTTGCTG (配列番号2)
であった。
Claims (6)
- 核酸試料を検出する方法であって、当該方法が、
(a)鋳型と、非加水分解性プライマーと、1種以上の末端ホスフェート標識ヌクレオチドと、DNAポリメラーゼと、ホスファターゼと、3’→5’エキソヌクレアーゼ活性を有する酵素であってDNAポリメラーゼ、エキソヌクレアーゼ及びそれらの組合せから選択し得る酵素との反応を含むDNAポリメラーゼ反応であって標識ポリホスフェートを生じるDNAポリメラーゼ反応を実施し、
(b)上記標識ポリホスフェートをホスファターゼと反応させて、検出可能な種を生じさせ、
(c)上記検出可能な種を検出する
ことを含み、上記末端ホスフェート標識ヌクレオチドが次の式Iのものである、方法。
- 前記糖部分が2’,3’−ジデオキシリボシルである、請求項1記載の方法。
- 核酸試料を特徴づけする方法であって、当該方法が、
(a)鋳型と、非加水分解性プライマーと、1種以上の末端ホスフェート標識ヌクレオチドと、DNAポリメラーゼと、ホスファターゼと、3’→5’エキソヌクレアーゼ活性を有する酵素であってDNAポリメラーゼ、エキソヌクレアーゼ及びそれらの組合せから選択し得る酵素との反応を含むDNAポリメラーゼ反応であって標識ポリホスフェートを生じるDNAポリメラーゼ反応を実施し、
(b)上記標識ポリホスフェートをホスファターゼと反応させて、上記試料に特徴的な検出可能な種を生じさせ、
(c)上記検出可能な種を検出し、
(d)上記検出に基づいて上記核酸を特徴づけする
ことを含み、上記末端ホスフェート標識ヌクレオチドが次の式Iのものである、方法。
- 工程(a)が、別個の標識を有する2種以上の末端ホスフェート標識ヌクレオチドの存在下で前記ポリメラーゼ反応を実施することをさらに含む、請求項3記載の方法。
- 前記糖部分が2’,3’−ジデオキシリボシルである、請求項3記載の方法。
- 請求項3記載の方法において、工程(b)で独特なシグナルプロフィールを有する検出可能な種を生じさせ、工程(d)で前記検出可能な種の存在又は不存在及び上記独特なシグナルプロフィールに基づいて前記核酸における突然変異を特徴づけ、もって標的核酸配列中の特異的ヌクレオチド塩基の突然変異を検出する方法。
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US31579801P | 2001-08-29 | 2001-08-29 | |
US10/113,025 US7033762B2 (en) | 2001-08-29 | 2002-04-01 | Single nucleotide amplification and detection by polymerase |
PCT/US2002/027564 WO2003020891A2 (en) | 2001-08-29 | 2002-08-29 | Single nucleotide amplification and detection by polymerase |
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