JP7120717B2 - 多重rna誘導型ゲノム編集 - Google Patents
多重rna誘導型ゲノム編集 Download PDFInfo
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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(Streptococcus 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(Saccharomyces 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。
Claims (9)
- 標的DNAに相補的なガイド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Cas9酵素を発現する細胞においてDNAに外来性核酸配列を多重挿入する方法であって、
(a)複数種類のガイドRNAおよび複数種類の外来性ドナー核酸配列を前記細胞に導入すること、ここで、前記複数種類のガイドRNAのそれぞれが前記Cas9酵素と前記DNAの特定の部位で共局在複合体を形成し、
前記Cas9酵素により前記DNAが切断されて切断部位が形成され、該切断部位に前記複数種類の外来性ドナー核酸配列のうちの1つが挿入される、および、
(b)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み、
前記細胞が真核細胞である、方法。 - 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に記載の方法。
- 前記ガイドRNAが、tracrRNA-crRNA融合体である、請求項1に記載の方法。
- 前記標的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に記載の方法。
- 前記外来性ドナー核酸配列が組換えにより挿入される、請求項1に記載の方法。
- 前記外来性ドナー核酸配列が相同組換えにより挿入される、請求項1に記載の方法。
- 前記ガイドRNAがプラスミド上に存在する、請求項1に記載の方法。
- 前記外来性ドナー核酸配列が前記切断部位の両側に隣接(flank)する相同配列またはアームを含む、請求項1に記載の方法。
- 前記外来性ドナー核酸配列が前記切断部位を除去するための配列を含む、請求項1に記載の方法。
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