JP2017522031A - 単一ヌクレオチド検出方法 - Google Patents
単一ヌクレオチド検出方法 Download PDFInfo
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- JP2017522031A JP2017522031A JP2017503523A JP2017503523A JP2017522031A JP 2017522031 A JP2017522031 A JP 2017522031A JP 2017503523 A JP2017503523 A JP 2017503523A JP 2017503523 A JP2017503523 A JP 2017503523A JP 2017522031 A JP2017522031 A JP 2017522031A
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Abstract
Description
プローブシステムの調製および使用
以下のヌクレオチド配列を有する一本鎖第1オリゴヌクレオチド1を調製した:
5’TCGTGCCTCATCGAACATGACGAGGXXQXXGGTTTGTGGT3’
(ここで、A、C、G、およびTは、DNAの特徴的な関連ヌクレオチド塩基を有するヌクレオチドを表す;Xは、従来のアミン付着化学作用を用いてAtto 655染料で標識したデオキシチミジンヌクレオチド(T)を表し、Qは、BHQ−2クエンチャで標識したデオキシチミジンヌクレオチドを表す)。それはさらに、デオキシヌクレオチド三リン酸(dNTP)の混合物中のデオキシチミジン三リン酸ヌクレオチド(dTTP)を捕捉することに対し選択的な捕捉領域(Aヌクレオチド)を含む)。
5’PCATGTTCGATGAGGCACGATAGATGTACGCTTTGACATACGCTTTGACAATACTTGAGCAGTCGGCAGATATAGGATGTTGCAAGCTCCGTGAGTCCCACAAACCAAAAACCTCG3’
(ここで、加えてPは5’ホスフェート基を表す)。
56μLの5x緩衝液pH7.5
28μLのオリゴヌクレオチド1、100nM
28μLのオリゴヌクレオチド2、10nM
2.8μLのdNTP混合物(dTTPを含む)、10nM
0.4UのPhusion IIホットスタートポリメラーゼ(エキソヌクレアーゼ)
1.6UのBst Large Fragment polymerase
20UのE. coliリガーゼ
4Uの熱安定性無機ピロホスファターゼ
280μLまでの水。
ここで、5x緩衝液は以下の混合物を含んだ:
200μLのTrizma(登録商標)塩酸塩、1M、pH7.5
13.75μLの MgCl2水溶液、1M
2.5μLのジチオトレイトール、1M
50μLのTriton(登録商標)X−100界面活性剤(10%)
20μLのニコチンアミドアデニンジヌクレオチド、100μM
166.67μLのKCl
1mLまでの水。
プローブシステムを用いた液滴マイクロ流体法
図2は、それぞれが単一ヌクレオチド塩基を含むマイクロ液滴を上記のタイプのプローブシステムを用いた反応に供する、マイクロ流体配列決定装置を図式的に示す。
Claims (26)
- (1)核酸の漸進的加ピロリン酸分解により単一ヌクレオシド三リン酸のストリームを生成するステップと;
(2)ポリメラーゼとリガーゼの存在下で、少なくとも1つの前記単一ヌクレオシド三リン酸を、(a)検出不能状態にある特徴的な検出可能要素で標識した第1一本鎖オリゴヌクレオチドと、(b)前記第1オリゴヌクレオチドの相補的領域にハイブリダイズすることが可能な、第2一本鎖オリゴヌクレオチドおよび第3一本鎖オリゴヌクレオチドとを含む対応プローブシステムと反応させることにより、少なくとも1つの実質的に二本鎖のオリゴヌクレオチド使用済みプローブを生成するステップと;
(3)前記使用済みプローブを、二本鎖エキソヌクレアーゼ活性を有する酵素で消化して、検出可能状態の検出可能要素と、少なくとも部分的に前記第1オリゴヌクレオチドの配列相補体である一本鎖第4オリゴヌクレオチドとを生成するステップと;
(4)前記第4オリゴヌクレオチドを別の第1オリゴヌクレオチドと反応させて、前記使用済みプローブに対応する、実質的に二本鎖のオリゴヌクレオチド生成物を生成するステップと;
(5)ステップ(3)とステップ(4)を周期的に繰り返すステップと;
(6)ステップ(3)の各反復において解放される前記特徴的な検出可能要素を検出するステップとを含むことを特徴とする、核酸を配列決定する方法。 - 前記第2オリゴヌクレオチドの5’末端と、前記第3オリゴヌクレオチドの3’末端がリンカー領域により連結されていることを特徴とする、請求項1に記載の方法。
- 前記リンカー領域はオリゴヌクレオチド領域を含むことを特徴とする、請求項2に記載の方法。
- 生成された前記第4オリゴヌクレオチドは閉ループを含むことを特徴とする、請求項2または3に記載の方法。
- 第1オリゴヌクレオチドは、補足される前記単一ヌクレオシド三リン酸に対し相補的な単一ヌクレオチド捕捉領域を含み、前記捕捉領域には前記第2オリゴヌクレオチドおよび第3オリゴヌクレオチドに対し相補的な領域が隣接することを特徴とする、請求項1に記載の方法。
- 前記検出可能要素は、前記第1オリゴヌクレオチドにおいてその5’末端と前記捕捉領域の間に位置することを特徴とする、請求項5に記載の方法。
- 前記第2オリゴヌクレオチドは、(a)前記捕捉領域の3’側の隣接領域にハイブリダイズし、(b)前記側の領域よりも長いことを特徴とする、請求項5に記載の方法。
- 前記第3オリゴヌクレオチドの3’末端はエキソヌクレアーゼ分解に対し抵抗性のある要素を含むことを特徴とする、請求項1に記載の方法。
- 前記第1オリゴヌクレオチドの3’末端と、前記第2オリゴヌクレオチドの対応領域の間に少なくとも1つのヌクレオチド塩基ミスマッチがあることを特徴とする、請求項1に記載の方法。
- 前記第1オリゴヌクレオチドに付着した前記検出可能要素はフルオロフォアを含むことを特徴とする、請求項1に記載の方法。
- 前記フルオロフォアは、少なくとも1つのクエンチャの存在により前記第1オリゴヌクレオチドにおいて検出不能とされていることを特徴とする、請求項10に記載の方法。
- 前記検出可能要素を解放した後、前記第4オリゴヌクレオチドに付着した残留オリゴヌクレオチド断片をすべて取り除き、新しい第2オリゴヌクレオチドおよび第3オリゴヌクレオチドをアニールできるようにする、ステップ(3)の温度を循環させることを特徴とする、請求項1に記載の方法。
- 前記プローブシステムは、異なる捕捉領域と特徴的な検出可能要素とをそれぞれ備える複数の第1オリゴヌクレオチドタイプを含むことを特徴とする、請求項1に記載の方法。
- 最大4つの異なるオリゴヌクレオチドプローブシステムの組を用い、各組の前記第1オリゴヌクレオチドは、天然に発生するDNAまたはRNAの特徴的なヌクレオチド塩基の1つに対し選択的な捕捉領域と、異なる検出可能要素とを有することを特徴とする、請求項13に記載の方法。
- ステップ(1)は各単一ヌクレオシド三リン酸を対応するマイクロ液滴中に含める工程をさらに含み、ステップ(2)〜(6)は各マイクロ液滴において実行されることを特徴とする、請求項1に記載の方法。
- ステップ(6)を各マイクロ液滴に適用することにより得られる結果は、前記核酸配列に特徴的なデータのストリームに組み込まれることを特徴とする、請求項15に記載の方法。
- (a)検出不能状態にある1つまたは複数のフルオロフォアで標識した第1一本鎖オリゴヌクレオチドと、(b)単一ヌクレオチド捕捉領域のいずれかの側に並置された、前記第1オリゴヌクレオチド上の相補的な3’側隣接領域および5’側隣接領域にそれぞれハイブリダイズすることが可能な、第2非標識一本鎖オリゴヌクレオチドおよび第3非標識一本鎖オリゴヌクレオチドとを含むことを特徴とする、多成分生物学的プローブシステム。
- 前記第2オリゴヌクレオチドの5’末端と、前記第3オリゴヌクレオチドの3’末端はリンカー領域により連結されていることを特徴とする、請求項17に記載の生物学的プローブシステム。
- 前記リンカー領域はオリゴヌクレオチド領域を含むことを特徴とする、請求項18に記載の生物学的プローブシステム。
- 前記フルオロフォアは、前記第1オリゴヌクレオチドの5’側隣接領域に位置することを特徴とする、請求項17〜19に記載の生物学的プローブシステム。
- 前記第1オリゴヌクレオチドはまた、1つまたは複数のクエンチャを含むことを特徴とする、請求項17〜20に記載の生物学的プローブシステム。
- 前記第2オリゴヌクレオチドは、前記第1オリゴヌクレオチドの3’側隣接領域より長いことを特徴とする、請求項17〜21に記載の生物学的プローブシステム。
- 前記第3オリゴヌクレオチドは、その3’末端においてエキソヌクレアーゼ分解に対し抵抗性のある要素を含むことを特徴とする、請求項17〜22に記載の生物学的プローブシステム。
- 前記第1オリゴヌクレオチドの3’末端のヌクレオチドは、前記第2オリゴヌクレオチドの対応するヌクレオチドとのミスマッチであることを特徴とする、請求項17〜23に記載の生物学的プローブシステム。
- 前記捕捉領域に特徴的な前記ヌクレオチド塩基が異なっている、1〜4つの異なる第1オリゴヌクレオチドタイプと、使用される前記フルオロフォアとを含むことを特徴とする、請求項17〜24に記載の生物学的プローブシステム。
- マイクロ液滴中に含まれていることを特徴とする、請求項17〜25に記載の生物学的プローブシステム。
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