JP7600296B2 - ヌクレオチド配列決定のためのヒドロゲルビーズ - Google Patents
ヌクレオチド配列決定のためのヒドロゲルビーズ Download PDFInfo
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- JP7600296B2 JP7600296B2 JP2023061984A JP2023061984A JP7600296B2 JP 7600296 B2 JP7600296 B2 JP 7600296B2 JP 2023061984 A JP2023061984 A JP 2023061984A JP 2023061984 A JP2023061984 A JP 2023061984A JP 7600296 B2 JP7600296 B2 JP 7600296B2
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Description
本願は、発明の名称「ヌクレオチド配列決定のためのヒドロゲルビーズ」の2017年8月1日に出願した米国仮特許出願第62/539,956号に対して優先権を主張し、その全体が参照により本明細書中に援用される。
1つの実施形態には、ヒドロゲルポリマーおよび遺伝物質を含むビーズが挙げられる。本明細書中で使用される「ヒドロゲル」という用語は、有機ポリマー(天然または合成)が共有結合、イオン結合、または水素結合によって架橋されて、水分子を捕捉してゲルを形成する三次元の開いた格子構造を形成するときに形成される物質を意味する。いくつかの実施形態では、ヒドロゲルは、生体適合性ヒドロゲルであってもよい。本明細書中で使用される「生体適合性ヒドロゲル」という用語は、生きた細胞に対して毒性でないゲルを形成し、取り込まれた細胞への酸素および栄養物の十分な拡散を可能にして、生存性を維持するポリマーを意味する。いくつかの実施形態では、ヒドロゲルポリマーは、水のような60~90%の流体と、10~30%のポリマーとを含む。いくらかの実施形態では、ヒドロゲルの含水率は約70~80%である。
本明細書中に提供されるいくつかの実施形態は、遺伝物質をカプセル化するビーズの製造方法に関する。いくつかの実施形態では、ヒドロゲルビーズは、渦支援エマルジョンによって調製される。本明細書中で使用される、渦支援エマルジョンとは、図1Aおよび図1Bに示されるように、管、バイアル、または反応容器などの容器内の遺伝物質とヒドロゲルポリマーの撹拌を意味する。これらの成分は、例えば手動または機械的な撹拌または振動によって混合することができる。いくつかの実施形態では、手動混合により、2、3、4、5、10、15、20、25、30、35、40、45、50、55、60、65、70、75、80、85、90、95、100、110、120、130、140、または150μmの直径、または上記値のいずれか2つによって規定される範囲内のサイズを有する遺伝物質をカプセル化するヒドロゲルビーズが得られる。いくつかの実施形態では、ビーズのサイズは不均一であり、従ってビーズのサイズは、様々な直径のビーズを含む。
本明細書中に提供されるいくつかの実施形態は、ビーズ内で遺伝物質を処理する方法に関する。いくつかの実施形態では、ヒドロゲルビーズ内にカプセル化された遺伝物質は、核酸処理のための1つ以上の試薬と接触される。いくつかの実施形態では、遺伝物質はヒドロゲルビーズ内に保持され、試薬はヒドロゲルビーズの細孔を通過することができる。いくつかの実施形態では、試薬は、溶解剤、核酸精製剤、DNA増幅剤、標識化剤、PCR剤、または遺伝物質の加工に使用される他の薬剤を含むことができる。このように、ヒドロゲルビーズは、ヒドロゲルビーズ内に遺伝物質自体を保持しながら、ヒドロゲルビーズの内外を試薬のバリアが通過することを可能にすることにより、ヒドロゲルビーズ内での遺伝物質の制御された反応のための微小環境を提供する。
本明細書中に提供されるシステム、方法および組成物のいくつかの実施形態は、アダプタが標的核酸に連結される方法を含む。アダプタは、配列決定プライマー結合部位、増幅プライマー結合部位、およびインデックスを含むことができる。例えば、アダプタは、P5配列、P7配列、またはそれらの相補体を含むことができる。本明細書中で使用される場合、P5配列は、配列番号1(AATGATACGGCGACCACCGA)で定義される配列を含み、P7配列は、配列番号2(CAAGCAGAAGACGGCATACGA)によって定義される配列を含む。いくつかの態様において、P5またはP7配列は、スペーサポリヌクレオチドを更に含むことができ、スペーサポリヌクレオチドは、1~20個、例えば1~15個または1~10個のヌクレオチド、例えば、長さで2、3、4、5、6、7、8、9、または10個のヌクレオチドであってもよい。いくつかの実施形態では、スペーサは10ヌクレオチドを含む。いくつかの実施形態では、スペーサは、10Tスペーサなどの、ポリTスペーサである。スペーサヌクレオチドは、ポリヌクレオチドの5’端に含まれてもよく、ポリヌクレオチドの5’端との結合によって好適な担体に結合していてもよい。結合は、ポリヌクレオチドの5’端に存在するホスホロチオエートなどの硫黄含有求核試薬によって達成することができる。いくつかの態様において、ポリヌクレオチドは、ポリTスペーサおよび5’ホスホロチオエート基を含む。従って、いくつかの実施形態では、P5配列は5’ホスホロチオエート‐TTTTTTTTTTAATGGCGACCACCGA‐3’、配列番号3であり、いくつかの実施形態では、P7配列は5’ホスホロチオエート‐TTTTTTTTTTAATGGCGACCACCGA‐3’、配列番号4である。
以下の実施例は、手動撹拌およびマイクロ流体液滴発生器を使用して、微生物細胞をカプセル化するヒドロゲルビーズを調製する実施形態を実証する。
以下の実施例は、実施例1からのヒドロゲルビーズをヌクレオチドで官能基化する方法を実証する。
以下の実施例は、架橋剤の可逆的な切断の際の、その中にカプセル化された遺伝物質を有するヒドロゲルビーズの内容物を放出する能力を実証する。
以下の実施例は、ヒドロゲルビーズ内にカプセル化された遺伝物質から核酸を配列決定する方法を実証する。
以下の実施例は、遺伝物質をカプセル化するヒドロゲルビーズからのDNAライブラリの配列決定を実証する。
以下の実施例は、ヒドロゲルビーズ内で調製されたDNAライブラリの空間インデックス化を実証する。
210 … ヒドロゲルビーズ
215 … 水性ストリーム用チャネル
220 … 不混和性流体用チャネル
Claims (7)
- 複数の細胞を油中でヒドロゲル溶液と接触させて混合物を形成する工程、
該混合物を可逆的架橋剤と撹拌して、複数のビーズを生成する工程、
複数のビーズを試薬と接触させて、遺伝物質を加工する工程、
固体支持体で該ビーズを分離する工程、および
該分離したビーズを切断して、該分離したビーズからのカプセル化した物質の拡散を可能にする工程を含み、
前記ヒドロゲル溶液が、ポリエチレングリコール(PEG)‐チオール/PEG‐アクリレートまたはPEG/ポリプロピレンオキシド(PPO)を含み、
各ビーズが異なる遺伝物質をカプセル化し、各ビーズが該遺伝物質を保持しながら、該ビーズを通って試薬の拡散を可能にする細孔を含む、個々の細胞からの遺伝物質を分析する方法。 - 前記分離したビーズを切断することが、ビーズの温度を上昇させること、ビーズを還元剤と接触させること、またはビーズを電界にさらすことを含む、請求項1記載の方法。
- 前記温度を、50℃を超える温度に上昇させる、請求項2記載の方法。
- 前記還元剤が、ジチオエリスリトール(DTE)、ジチオスレイトール(DTT)、2‐メルカプトエタノール、グルタチオン、チオグリコレート、2、3‐ジメルカプトプロパノール、トリス(2‐カルボキシエチル)ホスフィン(TCEP)、トリス(ヒドロキシメチル)ホスフィン(THP)、またはp‐[トリス(ヒドロキシメチル)ホスフィン]プロピオン酸(THPP)である、請求項2記載の方法。
- 前記試薬は、溶解剤、核酸精製剤、DNA増幅剤、標識化剤、PCR剤、または遺伝物質の加工に使用される他の薬剤を含む、請求項1記載の方法。
- 前記ビーズが、2μm~120μmの直径を有する、請求項1記載の方法。
- 前記油が、鉱油、炭化水素油、シリコーン油、またはポリジメチルシロキサン油を含む、請求項1記載の方法。
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