JP2023021447A - 多重rna誘導型ゲノム編集 - Google Patents
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Abstract
Description
本願は、2013年7月9日に提出された米国仮特許出願第61/844168号に基づく優先権を主張するものであり、あらゆる目的のため、その全体が参照により本明細書に取り込まれる。
本発明は、米国エネルギー省助成金番号DE-FG02-02ER63445、全米科学財団助成金番号NSF-SynBERC、および全米科学財団助成金番号SA5283-11210の国庫助成により行われた。米国政府は本発明に関して一定の権利を有する。
酵母におけるCRISPR-Cas9を用いた多重遺伝子編集の一般的プロセス
ストレプトコッカス・ピオゲネス(Streptococcous pyogenes)のCRISPR免疫系由来のCas9を用いて、相同組換えを促進し、サッカロミセス・セレビシエ(Saccharaomyces cerevisiae)において形質転換DNAを組み換えない細胞以外を選択する。Cas9を用いたRNA誘導型DNA切断の一般的な方法を図1に示す。Cas9、ガイドRNA、および標的DNAの間で共局在複合体が形成される。Cas9により標的DNA中に二本鎖切断が生じる。次に、相同組換えによりドナーDNAがDNAに挿入される。ドナーDNAには、切断部位の両側に隣接配列、およびCas9切断部位を除去する配列が含まれる。その結果、ドナーDNAが、ゲノムDNAであってもよいDNA中に組み込まれる。
詳細な繰り返しプロトコール
(ウラシル栄養要求株、構成的Cas9発現)細胞を、5mlのSC酵母培地またはSC+FOA(100μg/ml)中で、光学密度0.8~1.0まで成長させる。細胞を2250×gで3分間スピンし、10mlの水で1回洗浄する。細胞をスピンし、1mlの100mM酢酸リチウムに再懸濁する。細胞をペレット化し、500μlの100mM酢酸リチウムに再懸濁する。50μlの細胞;1nmolの二本鎖オリゴヌクレオチドプール、各5μgのガイドRNA(ウラシルマーカーを有するp426ベクター)を含み、70μlまで水を加えて所望の最終体積にしたDNA混合物;240μlの50%PEG3350;および36μlの1M酢酸リチウムをこの順番で添加することにより、形質転換混合物を調製する。混合物を30℃で30分間インキュベートする。次に、混合物をボルテックスし、混合物を42℃で20分間インキュベートすることにより細胞に熱ショックを与える。次に、細胞をペレット化し、上清を除去する。細胞を5mlのSC-ウラシルに播種して、ウラシル遺伝子を含むgRNAプラスミドを選択する。細胞を2日間回復させる。2日後、100μlの細胞培養物を5mlの新たに調製したSCに播種し、12時間成長させてプラスミド維持について非選択とする。次に、100μlのSC培養細胞を5mlのSC+FOA(100μg/mL)培地に播種して、プラスミドを有する細胞以外を選択する。これにより、プロセスの1サイクルが完了する。このプロセスを、所望のサイクル回数分、反復する。プロセス全体は、1サイクル、2サイクル、3サイクル、4サイクル、5サイクル、6サイクル、7サイクル、8サイクル、9サイクル、10サイクル、15サイクル、20サイクル、25サイクルなどを含んでいてもよい。
選択された変異体における熱ショックに対する熱耐性
本明細書に記載の方法を用いて、選択された変異体における熱ショックに対する熱耐性が示された。ノックアウトまたは点突然変異により酵母の熱耐性を増大させることが示されている遺伝子を、本明細書に記載のガイドRNA-Cas9システムにより標的化した。変異について、4個の遺伝子、すなわちUBC1、SCH9、TFS1、およびRAS2を選択した。SCH9は、浸透圧ストレス(osmostress)、栄養素、および環境ストレスの遺伝子を制御するタンパク質キナーゼである。TFS1は、カルボキシペプチダーゼYおよびIra2pを阻害し、Ras GAP活性を阻害し、DNA複製ストレスに応答する。RAS2は、窒素飢餓を制御するGTP結合タンパク質であり、ストレス応答経路に関与する。SCH9、TFS1、およびRAS2のそれぞれについて、コード領域にセリンからアラニンへの変異を含むアレルであるドナーDNAを作成した。UBC1-E2はユビキチン結合酵素である。リン酸化部位を除去することで熱耐性を生じる点突然変異を含むドナーDNAを作成した。
本開示に係る態様を以下に例示する。
<1>
標的DNAに相補的なRNAと共局在複合体を形成、且つ前記標的DNAを部位特異的に切断する酵素を発現する細胞において前記標的DNAに複数の変化を生じさせる方法であって、
(a)標的DNAに相補的であり且つ前記酵素を前記標的DNAにガイドする、1種類または複数種類のRNAをコードする第1の外来核酸を前記細胞に導入すること、ここで、前記1種類または複数種類のRNAおよび前記酵素が、前記標的DNAへの共局在複合体の構成要素である、
1種類または複数種類のドナー核酸配列をコードする第2の外来核酸を前記細胞に導入すること、ここで、前記1種類または複数種類のRNAおよび前記1種類または複数種類のドナー核酸の配列が発現し、前記1種類または複数種類のRNAおよび前記酵素が前記標的DNAに共局在し、前記酵素により前記標的DNAが切断され、前記ドナー核酸が前記標的DNAに挿入されて前記細胞中に変化したDNAが生成する、および、
ステップ(a)を複数回繰り返して前記細胞において前記DNAに複数の変化を生じさせることを含む、方法。
<2>
前記酵素が、RNA誘導型DNA結合タンパク質である、<1>に記載の方法。
<3>
前記酵素がCas9である、<1>に記載の方法。
<4>
前記細胞が真核細胞である、<1>に記載の方法。
<5>
前記細胞が、酵母細胞、植物細胞、または動物細胞である、<1>に記載の方法。
<6>
前記RNAが、約10~約500ヌクレオチドである、<1>に記載の方法。
<7>
前記RNAが、約20~約100ヌクレオチドである、<1>に記載の方法。
<8>
前記1種類または複数種類のRNAが、ガイドRNAである、<1>に記載の方法。
<9>
前記1種類または複数種類のRNAが、tracrRNA-crRNA融合体である、<1>に記載の方法。
<10>
前記DNAが、ゲノムDNA、ミトコンドリアDNA、ウイルスDNA、または外来性DNAである、<1>に記載の方法。
<11>
前記1種類または複数種類のドナー核酸配列が、組換えにより挿入される、<1>に記載の方法。
<12>
前記1種類または複数種類のドナー核酸配列が、相同組換えにより挿入される、<1>に記載の方法。
<13>
前記1種類または複数種類のRNAおよび前記1種類または複数種類のドナー核酸配列が、1種類または複数種類のプラスミド上に存在する、<1>に記載の方法。
Claims (13)
- 標的DNAに相補的なRNAと共局在複合体を形成し、且つ前記標的DNAを部位特異的に切断するII型CRISPRシステムのRNA誘導型DNA結合タンパク質を発現する細胞であって、
(a)前記細胞内のDNAの異なる部位に相補的な複数のガイドRNA、及び
(b)複数の外来性ドナー核酸配列
を含む、前記細胞。 - 前記細胞が、前記細胞内の前記DNAへの複数の外来性ドナー核酸配列挿入を含む、請求項1に記載の細胞。
- 前記II型CRISPRシステムのRNA誘導型DNA結合タンパク質がCas9である、請求項1に記載の細胞。
- 前記細胞が真核細胞である、請求項1に記載の細胞。
- 前記細胞が、酵母細胞、植物細胞、または動物細胞である、請求項1に記載の細胞。
- 前記複数のガイドRNAにおけるそれぞれのガイドRNAが、約10~約500ヌクレオチドである、請求項1に記載の細胞。
- 前記複数のガイドRNAにおけるそれぞれのガイドRNAが、約20~約100ヌクレオチドである、請求項1に記載の細胞。
- 前記複数のガイドRNAにおけるそれぞれのガイドRNAが、tracrRNA-crRNA融合体である、請求項1に記載の細胞。
- 前記DNAが、ゲノムDNA、ミトコンドリアDNA、ウイルスDNA、または外来性DNAである、請求項1に記載の細胞。
- 前記複数のガイドRNAにおけるそれぞれのガイドRNAがプラスミド上に存在する、請求項1に記載の細胞。
- 前記複数のガイドRNAにおけるそれぞれのガイドRNA及びそれぞれの外来性ドナー核酸配列がプラスミド上に存在する、請求項1に記載の細胞。
- 前記外来性ドナー核酸配列が、切断部位に隣接する相同配列またはアームを含む、請求項1に記載の細胞。
- 前記外来性ドナー核酸配列が、切断部位を除去するための配列を含む、請求項1に記載の細胞。
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