JP2012040000A - 修飾ヌクレオチド及びこれを用いたリアルタイムポリメラーゼ反応 - Google Patents
修飾ヌクレオチド及びこれを用いたリアルタイムポリメラーゼ反応 Download PDFInfo
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- C07H19/00—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof
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Abstract
【解決手段】蛍光物質が連結されたヌクレオチド、これを含むリアルタイムポリメラーゼ反応用組成物、分析キット、及び分析方法に関するものである。ポリメラーゼ反応基質のうちの一つであるヌクレオチドを化学的に修飾して、基質の役割以外に蛍光信号の発生の役割も付与することによって、プローブを製作する必要がないので経済的であり、PCR、RCA、及び等温重合反応など多様なリアルタイムポリメラーゼ反応に容易に適用されることができ、分析性能も従来の方法に比べて非常に優れている。
【選択図】図1
Description
100mMのMES緩衝溶液(Sigma−Aldrich)500μlに、100mM濃度のdGTP50μlとEDC(N−Ethyl−N'−(3−dimethylaminopropyl)carbodiimide hydrochloride、Sigma−Aldrich)30mgを加えた。室温で5分間攪拌した後、この混合反応溶液に10mgのエチレンジアミン・HCl(Sigma−Aldrich)を加え、4℃で16時間攪拌した。逆相HPLCを用いて、精製されたNH2−dGTPを収得した。
前記<実施例1>で精製されたNH2−dGTPをPBS(phosphate buffered saline)50μlに5.4mMになるように溶解させ、これにDMSO(dimethylsulfoxide)に溶解したボディピー−FLサクシニミジルエステル(10mM、400μl)を加えた後、常温で3時間攪拌した。前記<実施例1>に記載された逆相HPLCを用いて、精製されたγF−dGTPを収得した。
DNAポリメラーゼ検索は、プライマー(primer)伸長反応を通して行われた。
配列番号3の塩基配列で示される正方向プライマー(5'−CCACTCCTCCACCTTTGAC、100nM)、配列番号4の塩基配列で示される逆方向プライマー(5’−ACCCTGTTGCTGTAGCCA、100nM)、配列番号5の塩基配列で示される鋳型鎖(5’−CCACTCCTCCACCTTTGCCGCTGGGGCTGGCATTGCCCTCAACGACCACTTTGTCAAGCTCATTTCCTGGTATGCCAACGAATTTGGCTACAGCAACAGGGT、10nM乃至10fM)、dATP(25μM、Promega)、dCTP(25μM、Promega)、dTTP(25μM、Promega)、γF−dGTP(25μM)、ポリメラーゼ反応緩衝溶液(New England Biolabs)、及びTherminator γ DNAポリメラーゼ(2units)を含む20μlの反応混合溶液を、リアルタイムPCR反応分析に使用した。
前記<実施例4>で使用されたプライマーと鋳型鎖を同一な量で含みながら、dATP(25μM、Promega)、dCTP(25μM、Promega)、dTTP(25μM、Promega)、dGTP(25μM、Promega)、ポリメラーゼ反応緩衝溶液(New England Biolabs)、SYBR green I(1/20,000希釈、Invitrogen)、そしてTaqDNAポリメラーゼ(2units)を含む20μlの反応混合溶液を使用して、リアルタイムPCR反応分析を実施した。前記<実施例4>と同一のPCR条件及び機器を使用して、同一方法で分析を行い、その結果を図5に示した。
配列番号6の塩基配列で示されるプライマー(5’−CTGCTGCATCTAGACGTGACTGA、100nM)、配列番号7の塩基配列で示される鋳型鎖(5’−GATGCAGTCAGTCGTCATCGAGTCGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCACGTCT、100nM)、dATP(25μM、Promega)、dCTP(25μM、Promega)、dTTP(25μM、Promega)、γF−dGTP(25μM)、BSA(100μg/mL)、Phi29 DNAポリメラーゼ反応緩衝溶液(New England Biolabs)、及びPhi29 DNAポリメラーゼ(6units)が含まれている20μlの反応混合溶液を製造し、これをリアルタイムRCA反応分析に使用した。前記反応は30℃で20分間行っており、毎20秒ごとに反応溶液の蛍光強度を、前記<実施例4>で用いた機器を用いて測定し、その結果を図6に示した。
Claims (10)
- 前記蛍光物質は、フルオレセイン、ボディピー−FL(Bodipy−FL)、ボディピー−R6G(Bodipy−R6G)、パシフィックブルー(Pacific Blue)、マリーナブルー(Marina Blue)、クマリン(coumarin)、テトラメチルローダミン(tetramethylrhodamine)、Cy5、Cy3、及びテキサスレッド(Texas Red)からなる群より選択される、請求項1に記載のヌクレオチド。
- 請求項1または2のヌクレオチドを含む、リアルタイムポリメラーゼ反応用組成物。
- 前記組成物はdCTP及びdTTPをさらに含む、請求項3に記載のリアルタイムポリメラーゼ反応用組成物。
- 前記組成物はポリメラーゼをさらに含む、請求項3または4に記載のリアルタイムポリメラーゼ反応用組成物。
- 前記ポリメラーゼは、TaqDNAポリメラーゼ、Therminator γ DNAポリメラーゼ、及びphi29DNAポリメラーゼからなる群より選択される、請求項5に記載のリアルタイムポリメラーゼ反応用組成物。
- 前記リアルタイムポリメラーゼ反応は、リアルタイムPCR、等温重合、及びリアルタイムRCAからなる群より選択される、請求項3〜6のいずれか一項に記載のリアルタイムポリメラーゼ反応用組成物。
- 請求項3〜7のいずれか一項に記載のリアルタイムポリメラーゼ反応用組成物を含む、リアルタイムポリメラーゼ反応用分析キット。
- (a)請求項3〜7のいずれか一項に記載のリアルタイムポリメラーゼ反応用組成物及び検出対象の核酸の部位を増幅させるプライマーを準備する段階と、
(b)試料から核酸を抽出し、これを鋳型にして前記(a)段階で準備されたリアルタイムポリメラーゼ反応用組成物及びプライマーを用いてリアルタイムポリメラーゼ反応を行う段階と、
(c)前記(b)段階における蛍光信号を測定して検出対象の核酸の量を定量分析する段階
とを含む、リアルタイムポリメラーゼ反応分析方法。 - 前記リアルタイムポリメラーゼ反応は、リアルタイムPCR、等温重合、及びリアルタイムRCAからなる群より選択される、請求項9に記載のリアルタイムポリメラーゼ反応分析方法。
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