JP7490071B2 - シーケンシングのための新規核酸鋳型構造 - Google Patents
シーケンシングのための新規核酸鋳型構造 Download PDFInfo
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- C12Q1/6869—Methods for sequencing
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Description
本発明は、核酸シーケンシングの分野に関する。より具体的には、本発明は、シーケンシングのための核酸標的の鋳型を形成する分野に関する。
核酸シーケンシングの広範な使用は、新しい技術の開発及びコスト削減のために増加している。現在、ハイスループット単一分子シーケンシングの一般的な方法には、Illuminaプラットフォーム(Illumina,San Diego,Cal.)、Ion TorrentプラットフォームLife Technologies,Grand Island,NY)、SMRTを利用するPacific BioSciencesプラットフォーム(Pacific Biosciences,Menlo Park,Cal.)、又は、Oxford Nanopore Technologies(Oxford,UK)若しくはRoche Sequencing Solutions(Santa Clara,Cal.)によって製造されたものなどのナノポア技術を利用するプラットフォームが含まれる。
本発明は、シーケンシングのための核酸鋳型の新規構造を含む。構造は、短い一本鎖ギャップを有する二本鎖環(「ギャップのある環」)である。この構造は、シーケンシング又は複製を開始することができる伸長可能な3’末端を含む。本発明は、シーケンシングにおいて新規鋳型構造を使用する方法並びに新規鋳型を作製する方法をさらに含む。新規鋳型は、二本鎖環の一方の鎖のみにニックを導入することによって作製される。ニックは、その特異的結合配列を認識するニッキング酵素によって、又は一本鎖切断(ニック)を形成する第2の酵素と組み合わせてウラシル塩基を認識するグリコシラーゼによって作られる。
定義
特に定義しない限り、本明細書で使用する技術的及び科学的用語は、当業者が一般的に理解するものと同じ意味を有する。Sambrook et al.,Molecular Cloning,A Laboratory Manual,4th Ed.Cold Spring Harbor Lab Press(2012)を参照されたい。
この実施例では、ギャップのある環形鋳型の調製は、5’「ハンドル」又はニッキング部位を含む5’配列を含む増幅プライマーを用いた標的核酸の増幅から開始した。
実施例2.ライゲーティングアダプターによるギャップのある環形鋳型の調製
Claims (14)
- ギャップのある環形核酸鋳型を形成する方法であって、
a.アダプターを試料中の二本鎖核酸の少なくとも1つの末端に付着させてアダプター付き核酸を形成するステップであって、前記アダプターの一方の鎖のみが切断部位を含む、前記ステップと;
b.前記アダプター付き核酸の末端を結合させて、環状のアダプター付き核酸を形成するステップと;
c.前記環状のアダプター付き核酸を、前記切断部位を認識する切断剤と接触させて、前記環状のアダプター付き核酸における一方の鎖のみの一部を除去し、それにより、環状鎖及びギャップのある鎖を有する、ギャップのある環形核酸鋳型を形成するステップと
を含み、
前記環状鎖が、前記ギャップのある環形核酸鋳型のギャップ部分にプライマー結合部位を含む、
前記方法。 - 前記アダプターが、標的特異的配列及びアダプター配列を含むプライマーを伸長することによって付着される、請求項1に記載の方法。
- 前記アダプターがライゲーションによって付着される、請求項1に記載の方法。
- 前記アダプターが核酸バーコードを含む、請求項1~3のいずれか1項に記載の方法。
- 前記切断剤がニッキングエンドヌクレアーゼであり、前記切断部位が前記ニッキングエンドヌクレアーゼの認識部位である、請求項1~4のいずれか1項に記載の方法。
- 前記切断剤がウラシル-N-グリコシラーゼであり、前記切断部位がウリジン含有ヌクレオチドである、請求項1~4のいずれか1項に記載の方法。
- 前記環状のアダプター付き核酸を形成する前に、前記アダプター付き核酸を増幅するステップをさらに含む、請求項1~6のいずれか1項に記載の方法。
- 前記環状のアダプター付き核酸を形成するステップの後に、前記試料をエキソヌクレアーゼと接触させるステップをさらに含む、請求項1~7のいずれか1項に記載の方法。
- 前記アダプター付き核酸の末端を結合させることが、ライゲーションによるものである、請求項1~8のいずれか1項に記載の方法。
- ステップcにおいて、前記環状のアダプター付き核酸における一方の鎖のみの前記一部を除去することが、前記切断剤による切断後の熱変性によるものである、請求項1~9のいずれか1項に記載の方法。
- 前記ギャップのある環形核酸鋳型の前記ギャップのある鎖が、伸長可能な3’末端を含む、請求項1~10のいずれか1項に記載の方法。
- 前記環状鎖の少なくとも一部をコピーするために前記伸長可能な3’末端を伸長することによって標的核酸をシーケンシングすることをさらに含む、請求項11に記載の方法。
- 試料中の核酸をシーケンシングする方法であって、
a.ギャップのある環形核酸鋳型のライブラリーを形成するステップであって、
i.アダプターを試料中の二本鎖核酸の少なくとも1つの末端に付着させてアダプター付き核酸を形成すること、ここで、前記アダプターの一方の鎖のみが切断部位を含み、前記アダプターがプライマー結合部位を含む;
ii.前記アダプター付き核酸のそれぞれの末端を結合させて、環状のアダプター付き核酸を形成すること;
iii.前記環状のアダプター付き核酸を、前記切断部位を認識する切断剤と接触させて、前記環状のアダプター付き核酸のそれぞれにおける一方の鎖のみの一部を除去し、それにより、伸長可能な3’末端を有するギャップのある鎖と環状鎖とを有する、ギャップのある環形核酸鋳型のライブラリーを形成すること
を含む、前記ステップと;
b.前記環状鎖の少なくとも一部をコピーするために前記伸長可能な3’末端を伸長させ、それにより、合成によるシーケンシング法によって前記ギャップのある環形核酸鋳型のライブラリーをシーケンシングするステップ
を含み、
前記環状鎖が、前記ギャップのある環形核酸鋳型のギャップ部分にプライマー結合部位を含む、
前記方法。 - ギャップのある環形核酸鋳型のライブラリーを形成する方法であって、
a.アダプターを試料中の二本鎖核酸の少なくとも1つの末端に付着させてアダプター付き核酸を形成するステップであって、前記アダプターの一方の鎖が切断部位を含む、前記ステップと;
b.前記アダプター付き核酸のそれぞれの末端を結合させて、環状のアダプター付き核酸を形成するステップと;
c.前記環状のアダプター付き核酸を、前記切断部位を認識する切断剤と接触させて、前記環状のアダプター付き核酸のそれぞれにおける一方の鎖のみの一部を除去し、それにより、環状鎖及びギャップのある鎖を有する、ギャップのある環形核酸鋳型のライブラリーを形成するステップと
を含み、
前記環状鎖が、前記ギャップのある環形核酸鋳型のギャップ部分にプライマー結合部位を含む、
前記方法。
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