WO2016080097A1 - 簡便で高効率の遺伝子改変非ヒト哺乳動物の作製方法 - Google Patents
簡便で高効率の遺伝子改変非ヒト哺乳動物の作製方法 Download PDFInfo
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Definitions
- the present invention relates to a simple and highly efficient method for producing a genetically modified non-human mammal using the CRISPR-Cas9 system, and more particularly to a method for enabling gene knock-in with high efficiency.
- ES cells embryonic stem cells
- CRISPR-Cas9 Clustered Regularly Interspaced Short Palindromatic Repeat-associated protein 9
- the CRISPR-Cas9 system is based on the acquired immune mechanism of bacteria, and is a Cas9 protein that is a double-stranded DNA-cleaving enzyme, RNA (crRNA) having a base sequence complementary to the target DNA region, and partially complementary to crRNA.
- RNA crRNA
- a complex composed of RNA having a base sequence specifically recognizes and binds to the target DNA region and cleaves it.
- RNA and crRNA and tracrRNA or chimeric RNA linking crRNA and tracrRNA are introduced into a fertilized egg, and the genome of the fertilized egg is directly manipulated in vivo ( In vivo genome modification), gene targeting mammals can be produced without going through ES cells (Patent Document 1, Non-Patent Document 1).
- Patent Document 2 Non-Patent Documents 2-4
- knock-in mice with a single base substitution Non-Patent Documents 3, 5, and 6).
- Non-Patent Document 7 Non-Patent Document 7
- the present invention is a simple and highly efficient method for producing a genetically modified non-human mammal using the CRISPR-Cas9 system, and particularly enables gene knock-in with high efficiency even when the gene size is relatively large.
- An object of the present invention is to provide a manufacturing method.
- the present inventors have introduced Cas9 protein into a fertilized egg together with a fragment of crRNA and a fragment of tracrRNA in the form of protein instead of RNA, thereby modifying the gene of the target DNA.
- this technique it was found that even a gene of a relatively large size can be knocked in with high efficiency, and a genetically modified non-human mammal can be produced easily and efficiently. It came to complete.
- the present invention has the following configuration.
- a method for producing a genetically modified non-human mammal comprising introducing a Cas9 protein, a crRNA fragment containing a base sequence complementary to a target DNA region, and a tracr RNA fragment into an oocyte of a non-human mammal. And the method comprising genetically modifying the target DNA.
- the method of [1], wherein the non-human mammal is selected from rodents.
- the method of [1] or [2], wherein the oocyte is a fertilized egg.
- [7] Genetic modification is insertion of a gene or base sequence into a target DNA region, and a donor DNA containing the gene or base sequence together with a Cas9 protein, a crRNA fragment and a tracr RNA fragment is introduced into an oocyte of a non-human mammal
- a crRNA fragment comprising a base sequence complementary to the target DNA and the base sequence represented by SEQ ID NO: 2 or a mutant sequence thereof and comprising a base sequence of 42 bases or less; and / or represented by SEQ ID NO: 4
- a tracr RNA fragment comprising a base sequence or a mutant sequence thereof and comprising a base sequence of 69 bases or less
- a kit for genetically modifying a target DNA comprising [10] The kit according to [9], further comprising a Cas9 protein and / or donor DNA containing a gene or base sequence for insertion into a target DNA region.
- the crRNA fragment is 30 to 42 bases long
- the tracr RNA fragment is 24 to 69 bases long
- the Cas9 protein is at a concentration of 30 ng / ⁇ L or more
- the crRNA fragment and the tracr RNA fragment are each 0
- the above method which is used at a concentration of 6 pmol / ⁇ L or more.
- a simple and highly efficient method for producing a genetically modified non-human mammal using the CRISPR-Cas9 system in particular, gene knock-in with high efficiency even if the gene size is relatively large. It is possible to provide a manufacturing method that enables the above.
- FIG. 1 shows an outline of a method for producing a genetically modified mouse according to the method of the present invention.
- a targeting vector is used in combination.
- FIG. 2 shows a schematic diagram of a targeting vector “pActb-TetO-FLEX-EGFP-polyA” and an outline of homologous recombination thereby.
- FIG. 3-1 is a graph showing the in vitro cleavage efficiency of the target DNA by the combination of the Cas9 protein and each concentration of the crRNA fragment and the tracrRNA fragment.
- FIG. 3-2 is a graph showing the in vitro cleavage efficiency of target DNA by a combination of crRNA fragments (0 bp (none), 20 bp, 30 bp, 36 bp, 39 bp, or 42 bp) of each base length and Cas9 protein and tracrRNA fragment.
- FIG. FIG. 4 is a photograph showing the screening results of knock-in mice. It shows that 5 out of 11 offspring (lanes 1, 2, 5, 8, 11) are knock-in mice.
- FIG. 5 is a photograph showing the expression of EGFP in fibroblasts derived from knock-in mice. Arrowhead: In fibroblasts derived from knock-in mice, the region shown by DsRed and the region shown by EGFP overlap.
- the Cas9 protein is not particularly limited as long as it can be used in the CRISPR / Cas system, and may be any one that can be activated by binding to the following tracr RNA fragment and crRNA fragment and cleaving the target double-stranded DNA.
- Such Cas9 protein is publicly known, and those exemplified in WO2014 / 131833 can be used.
- Cas9 protein derived from Streptococcus pyogenes is used.
- the amino acid sequence and base sequence of Cas9 protein are registered in a public database, for example, GenBank (http://www.ncbi.nlm.nih.gov) (for example, accession number: Q99ZW2.1, etc.) These can be used in the present invention.
- the Cas9 protein may include the amino acid sequence represented by SEQ ID NO: 1 or consist of the amino acid sequence.
- the Cas9 protein is represented by SEQ ID NO: 1 as long as it retains the activity of the original protein, that is, the activity of binding to the following tracr RNA fragment and crRNA fragment and cleaving the target double-stranded DNA.
- the amino acid sequence to be used includes an amino acid sequence in which one to a plurality of amino acids are deleted, substituted, added or inserted, or a polypeptide consisting of the amino acid sequence.
- the “plurality” means 1 to 50, preferably 1 to 30, more preferably 1 to 10.
- the crRNA fragment contains a base sequence complementary to the target DNA region and a base sequence capable of interacting with the tracr RNA fragment as a whole, preferably 42 bases or less, 39 bases or less, or 36 bases or less, or 30 bases or more. 36 bases or more, or 39 bases or more, for example, 30 to 42 bases, more specifically 30 bases, 31 bases, 32 bases, 33 bases, 34 bases, 35 bases, 36 bases, 37 bases, 38 bases, 39 bases, It can be 40 bases, 41 bases or 42 bases.
- the tracr RNA fragment is not particularly limited as long as it can guide the Cas9 protein together with the crRNA fragment, but preferably, a tracr RNA derived from Streptococcus pyogenes is used.
- the total amount of the tracr RNA fragment is preferably 69 bases or less, 59 bases or less, or 34 bases or less, or 24 bases or more, for example, 24 bases, 24 to 34 bases, 24 to 59 bases, or 24 to 69 bases. be able to.
- the tracr RNA fragment has a base sequence that binds (hybridizes) under stringent conditions to a base sequence complementary to the above base sequence, and is an oligo that can guide the Cas9 protein together with the crRNA fragment. Nucleotides are also included.
- Such oligonucleotides include oligonucleotides having a base sequence having addition, substitution, deletion or insertion of several bases in the above base sequence (here, “several bases” are within 3 bases or within 2 bases) 80% or more, more preferably 90% or more, and most preferably 95% or more when calculated using the above base sequence and BLAST or the like (for example, default or initial setting parameters) Oligonucleotides consisting of base sequences having the same identity can be included. In the present specification, such an oligonucleotide may be referred to as a “mutant sequence” of the above base sequence.
- the homology arm is not particularly limited as long as it has the same identity as the base sequence in the target DNA region to a degree sufficient for homologous recombination, but BLAST and the like (for example, default or initial setting parameters) ),
- the identities are 95% or more, preferably 97% or more, more preferably 99% or more, and further preferably 99.9% or more.
- the gene or base sequence to be inserted may be endogenous, exogenous, homologous or heterologous to the oocyte used in the method of the present invention.
- base insertion / deletion occurs frequently at a high frequency at the cleavage site, and the gene in the target DNA region can be destroyed (gene knockout) by frameshift mutation.
- multiple types of genetic modification can be generated by using a combination of the multiple types of crRNA fragments and multiple types of donor DNA.
- microinjected oocyte is then transplanted into the uterus of a female non-human mammal in a pseudopregnant state, and then a litter is obtained.
- Transplantation can be performed in fertilized eggs of 1-cell stage embryo, 2-cell stage embryo, 4-cell stage embryo, 8-cell stage embryo, 16-cell stage embryo, or morula stage embryo.
- Microinjected oocytes can be cultured under appropriate conditions until transplanted, if necessary.
- Oocyte transplantation and culture can be performed based on a conventionally known technique (Nagy A et al., Supra).
- the confirmation of the presence / absence of genetic modification and the determination of the genotype can be performed based on a conventionally known method, and for example, a PCR method, a sequencing method, a Southern blotting method, or the like can be used.
- the genomic DNA subjected to these analyzes may be extracted from a part of an embryo before transplantation or may be extracted from a litter.
- a target DNA can be genetically modified with high efficiency by introducing Cas9 protein, crRNA fragment and tracr RNA fragment into oocytes of non-human mammals, particularly in combination with donor DNA.
- genes of various sizes are highly efficient (for example, 10% or more, 20% or more, 30% or more, 40% or more) , 45% or more), and genetically modified non-human mammals can be efficiently produced.
- Kit for genetically modifying target DNA The kit of the present invention comprises a crRNA fragment and / or a tracr RNA fragment, and as described above, for genetic modification of the target DNA and / or non-target DNA that has been genetically modified. It can be used to make human mammals.
- the kit of the present invention may further contain the Cas9 protein and / or donor DNA.
- Each element included in the kit may be stored in a separate container, or may be stored in the same container.
- Each element may be contained in a container for each use amount, or a plurality of doses may be contained in one container (the user can determine the amount necessary for one use). Can be taken out and used).
- Each element may be housed in the container in a dry form, or may be housed in the container in a form dissolved in a suitable solvent.
- the targeting vector was prepared from the pAAV-TetO-FLEX-HA-mKate2-TeNT-polyA plasmid (given by Dr. Akihiro Yamanaka, Department of Neurology, Institute of Environmental Medicine, Nagoya University) as follows. First, HA-mKate2-TeNT was removed by digestion with XhoI (NEB) and HindIII (NEB), and the PCR-amplified gene encoding EGFP was replaced / inserted in the reverse direction.
- AAV2-ITR was removed by digestion with NarI (NEB) and BstEII (NEB), and PCR amplified ⁇ -actin derived from genomic DNA of C57BL / 6J mice (hereinafter referred to as “Actb”).
- the gene fragment (2.0 kb) was replaced and inserted using the In-Fusion HD Cloning Kit (Takara) as the left homology arm.
- digested with NotI (NEB) and MluI (NEB) and the PCR amplified Actb gene fragment (2.0 kb) derived from the genomic DNA of C57BL / 6J mice was used as the right homology arm by In-Fusion reaction. Replaced / inserted.
- the targeting vector thus obtained is hereinafter referred to as “pActb-TetO-FLEX-EGFP-polyA”.
- a schematic diagram of pActb-TetO-FLEX-EGFP-polyA is shown in FIG. (Cas9 protein)
- Cas9 protein Recombinant Cas9 protein is available from NEB and PNA Bio. We purchased more.
- (CrRNA fragment and tracrRNA fragment) The tracrRNA fragment and the crRNA fragment were chemically synthesized having the base sequences shown in Table 1 below, and purified by polyacrylamide gel electrophoresis (Fusmac Co., Ltd.). The crRNA fragment contains the Actb target sequence.
- the reaction was stopped with 6 ⁇ DNA loading buffer containing 30% glycerol, 1.2% SDS and 250 mM EDTA, and the reaction was electrophoresed on a 2% agarose gel. To the control, no crRNA fragment or tracrRNA fragment was added. 2. Examination of crRNA fragment length In this experiment, the in vitro cleavage assay was performed under the same conditions except that the crRNA fragment was replaced with one having the base sequence shown in Table 2 below and used at 0.61 pmol / ⁇ L, respectively. No crRNA fragment was added to the control.
- crRNA fragment refers to a nucleotide sequence represented by SEQ ID NO: 6.
- One-cell embryos were obtained by mating BDF1 mice (Claire Japan, Inc.), and those that were cryopreserved until use were used.
- the complex was microinjected into the male pronucleus of a thawed embryo, incubated at 37 ° C. for 24 hours, and then transplanted into an ICR female mouse (Clea Japan Co., Ltd.) in which a two-cell stage embryo was pseudopregnant, A litter was obtained. Knock-in mice were screened from the resulting litters. (PCR screening) A part of the tail of a litter was collected and treated with proteinase K, and then genomic DNA was prepared by phenol extraction. Next, PCR was performed using the obtained genomic DNA as a template and ExTaq (Takara) and the three types of primer pairs shown in Table 3 below, and electrophoresis was performed on a 1% agarose gel to screen knock-in mice. The obtained PCR product was further cloned using TOPO TA Cloning Kit (Life Technologies) and sequenced.
- the Southern probe (0.8 kb) was prepared by PCR amplification from BDF1 genomic DNA, cloning using TOPO TA Cloning Kit, and labeling with 32 P random primer (Perkin Elmer). Genomic DNA obtained from knock-in mice is digested with EcoRI, separated by electrophoresis using 0.8% agarose gel, transferred to a nylon membrane (Amersham), hybridized with a Southern probe, detected, and genotyped. It was confirmed. The position of the probe is shown in FIG.
- the crRNA fragment has a length of 30 bp, that is, when it includes a base sequence complementary to a target DNA region consisting of 20 bp and a base sequence capable of interacting with a tracr RNA fragment consisting of 10 bp (SEQ ID NO: 9), It was confirmed that the PCR product containing the Actb target sequence can be cleaved with a high efficiency of 95%. As a result, in order to achieve high cleavage efficiency, the crRNA fragment should have a base sequence complementary to a target DNA region consisting of at least 20 bp and a base sequence capable of interacting with a tracr RNA fragment consisting of at least 10 bp. Indicates good.
- the injection amount of the crRNA fragment and the tracrRNA fragment was increased to “0.61 pmol / ⁇ L”, respectively.
- I could get pups.
- the TetO-FLEX-EGFP-polyA cassette was possessed at the Actb locus at a very high rate of 5 (45.5% of offspring) ( FIG. 4 and Table 4 below).
- the efficiency of knock-in can be significantly increased by increasing the injection amount of the crRNA fragment and the tracrRNA fragment.
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Abstract
Description
[1] 遺伝子改変された非ヒト哺乳動物の作製方法であって、Cas9タンパク質、標的DNA領域と相補的な塩基配列を含むcrRNA断片及びtracr RNA断片を非ヒト哺乳動物の卵母細胞に導入し、該標的DNAを遺伝子改変することを含む、上記方法。
[2] 非ヒト哺乳動物が、げっ歯類より選択される、[1]の方法。
[3] 卵母細胞が受精卵である、[1]又は[2]の方法。
[4] crRNA断片が、標的DNAと相補的な塩基配列、及び配列番号2で表される塩基配列もしくはその変異配列を含む、[1]~[3]のいずれかの方法。
[5] tracr RNA断片が、配列番号4で表される塩基配列もしくはその変異配列を含む、[1]~[4]のいずれかの方法。
[6] Cas9タンパク質、crRNA断片及びtracr RNA断片が複合体を形成している、[1]~[5]のいずれかの方法。
[7] 遺伝子改変が標的DNA領域への遺伝子又は塩基配列の挿入であり、Cas9タンパク質、crRNA断片及びtracr RNA断片と共に、該遺伝子又は塩基配列を含むドナーDNAを非ヒト哺乳動物の卵母細胞に導入することを含む、[1]~[6]のいずれかの方法。
[8] Cas9タンパク質1ng/μLに対し、crRNA断片及びtracr RNA断片をそれぞれ0.002pmol/μLを超える濃度で用いる、[1]~[7]のいずれかの方法。
[9] 標的DNAと相補的な塩基配列、及び配列番号2で表される塩基配列もしくはその変異配列を含み、42塩基以下の塩基配列からなるcrRNA断片;ならびに/あるいは
配列番号4で表される塩基配列もしくはその変異配列を含み、69塩基以下の塩基配列からなるtracr RNA断片、
を含む標的DNAを遺伝子改変するためのキット。
[10] Cas9タンパク質、及び/又は、標的DNA領域へ挿入するための遺伝子もしくは塩基配列を含むドナーDNAをさらに含む、[9]のキット。
[11] 標的DNA領域へ遺伝子又は塩基配列が挿入されたマウスの作製方法であって、Cas9タンパク質、標的DNA領域と相補的な塩基配列を含むcrRNA断片及びtracr RNA断片、ならびに該遺伝子又は塩基配列を含むドナーDNAをマウスの卵母細胞に導入し、該標的DNA領域へ該遺伝子又は塩基配列を挿入することを含み、
ここで、該crRNA断片は30~42塩基長であり、該tracr RNA断片は24~69塩基長であり、該Cas9タンパク質を30ng/μL以上の濃度で、かつcrRNA断片及びtracr RNA断片をそれぞれ0.6pmol/μL以上の濃度で用いる、上記方法。
本発明においてCas9タンパク質は、CRISPR/Casシステムにおいて使用できるものであればよく、下記tracr RNA断片及びcrRNA断片と結合して活性化し、標的二本鎖DNAを切断できるものであればよく特に限定はされない。このようなCas9タンパク質は公知であり、WO2014/131833に例示されるものを利用することができる。好ましくは、Streptococcus pyogenes由来のCas9タンパク質を利用する。Cas9タンパク質のアミノ酸配列及び塩基配列は公開されたデータベース、例えば、GenBank(http://www.ncbi.nlm.nih.gov)に登録されており(例えば、アクセッション番号:Q99ZW2.1等)、本発明においてはこれらを利用することができる。
2.crRNA断片
本発明においてcrRNA断片は少なくとも、標的DNA領域と相補的な塩基配列とtracr RNA断片と相互作用可能な塩基配列を、5’側よりこの順で含んでなる。
3.tracr RNA断片
本発明においてtracr RNA断片は、5’側にcrRNA断片の一部の塩基配列と結合(ハイブリダイズ)可能な塩基配列を有し、これら塩基配列の相互作用によりcrRNA断片/tracr RNA断片ハイブリッドを形成する。これが標的DNA領域へのCas9タンパク質のガイドとして作用する。
4.ドナーDNA
本発明においてドナーDNAは、Cas9タンパク質に切断された部位にて生じる相同組換え修復(Homologous Recombination:HR)を利用して、標的DNA領域に所望の遺伝子又は塩基配列を挿入(ノックイン)するために用いられるDNAである。
5.遺伝子改変された非ヒト動物の作製方法
本発明の遺伝子改変された非ヒト哺乳動物の作製方法は、Cas9タンパク質、crRNA断片及びtracr RNA断片を非ヒト哺乳動物の卵母細胞に導入し、標的DNAを遺伝子改変することを含む。
(i) Cas9タンパク質は、5~5000ng/μL、好ましくは5~500ng/μL、より好ましくは10~50ng/μL、さらに好ましくは20~40ng/μL、よりさらに好ましくは30ng/μLとする;
(ii) crRNA断片及びtracr RNA断片はそれぞれ、Cas9タンパク質1ng/μLに対し、0.002pmol/μLを超える濃度、好ましくは0.005pmol/μL以上、より好ましくは0.01pmol/μL以上、さらに好ましくは0.02pmol/μL以上であり、上限は2pmol/μL以下、好ましくは0.2pmol/μL以下となる濃度とする(crRNA断片の量とtracr RNA断片の量とは、同一であってもよいし、異なっていてもよい);
(iii) crRNA断片及びtracr RNA断片はそれぞれ、0.06pmol/μLを超える濃度、好ましくは0.15pmol/μL以上、より好ましくは0.3pmol/μL以上、さらに好ましくは0.6pmol/μL以上であり、上限は60pmol/μL以下、好ましくは6pmol/μL以下、となる濃度とする(crRNA断片の量とtracr RNA断片の量とは、同一であってもよいし、異なっていてもよい)。
6.標的DNAを遺伝子改変するためのキット
本発明のキットは、crRNA断片及び/又はtracr RNA断片を含み、上記のとおり、標的DNAを遺伝子改変するため、ならびに/あるいは、標的DNAが遺伝子改変された非ヒト哺乳動物を作製するために用いることができる。
[実験材料及び方法]
(ターゲティングベクター)
ターゲティングベクターは、pAAV-TetO-FLEX-HA-mKate2-TeNT-polyAプラスミド(名古屋大学環境医学研究所神経系分野2 山中章弘博士より贈与)より以下のとおり作製した。まず、XhoI(NEB)及びHindIII(NEB)で消化してHA-mKate2-TeNTを除去し、そこにPCR増幅されたEGFPをコードする遺伝子を逆向きに置換・挿入した。次いで、NarI(NEB)及びBstEII(NEB)で消化してAAV2-ITRを除去し、そこにC57BL/6JマウスのゲノムDNAに由来するPCR増幅したβ-アクチン(以下、「Actb」と記載する)遺伝子の断片(2.0kb)を左ホモロジーアームとして、In-Fusion HD Cloning Kit(Takara)を用いて置換・挿入した。最後に、NotI(NEB)及びMluI(NEB)で消化し、そこにC57BL/6JマウスのゲノムDNAに由来するPCR増幅したActb遺伝子の断片(2.0kb)を右ホモロジーアームとしてIn-Fusion反応により置換・挿入した。
(Cas9タンパク質)
組換えCas9タンパク質は、NEB及びPNA Bio.より購入した。
(crRNA断片及びtracrRNA断片)
tracrRNA断片及びcrRNA断片は下記表1に示す塩基配列を有するものを化学合成し、ポリアクリルアミドゲル電気泳動により精製した(株式会社ファスマック)。crRNA断片はActb標的配列を含む。
1.濃度の検討
Cas9タンパク質(30ng/μL)とcrRNA断片及びtracrRNA断片(それぞれ、0pmol/μL,0.061pmol/μL,0.153pmol/μL,0.305pmol/μL、又は0.61pmol/μL)をActb標的配列を含むPCR産物と共に、Cas9 Nuclease Reactionバッファー(NEB)中にて37℃で60分間インキュベートし、次いでRNase A(5mg)で処理して(37℃にて30分間)、RNAを除去した。反応を30%グリセロール、1.2%SDS及び250mM EDTAを含む6×DNAローディングバッファーで停止し、反応物を2%アガロースゲルにて電気泳動した。対照には、crRNA断片、及びtracrRNA断片を加えなかった。
2.crRNA断片長の検討
上記1.の実験においてcrRNA断片を、下記表2に示す塩基配列を有するものに代え、それぞれ0.61pmol/μLにて用いた以外は同一の条件にてin vitro切断アッセイを行った。対照には、いずれのcrRNA断片も加えなかった。
0.1TEバッファー中に、Cas9タンパク質(30ng/μL)、crRNA断片(0.061もしくは0.61pmol/μL)、tracrRNA断片(0.061もしくは0.61pmol/μL)、及びpActb-TetO-FLEX-EGFP-polyA(10ng/μL)を添加・混合し、37℃にて少なくとも15分間インキュベートし、複合体を形成した。
(PCRスクリーニング)
産仔の尾部を一部採取し、プロテイナーゼKで処理した後、フェノール抽出法によりゲノムDNAを調製した。次いで、得られたゲノムDNAを鋳型として、ExTaq(Takara)及び下記表3に示す3種のプライマー対を用いてPCRを行い、1%アガロースゲルにて電気泳動してノックインマウスをスクリーニングした。得られたPCR産物についてはさらに、TOPO TA Cloning Kit(Life Technologies)を用いてクローニングし、配列決定を行った。
サザンプローブ(0.8kb)は、BDF1ゲノムDNAよりPCR増幅し、TOPO TA Cloning Kitを用いてクローニングした後、32Pランダムプライマー(Perkin Elmer)を用いて標識して調製した。ノックインマウスより得たゲノムDNAは、EcoRIで消化して0.8%アガロースゲルを用いた電気泳動により分離し、ナイロンメンブレン(Amersham)へ転写した後、サザンプローブとハイブリダイズさせ検出し、遺伝子型を確認した。プローブの位置は図2に示す。
(繊維芽細胞の初代培養)
2週齢のマウスの耳より小片を切り取り、37℃にて30分間、4mg/mlコラゲナーゼL(新田ゼラチン株式会社)及び4mg/mlディスパーゼで処理した後、10%FBS/DMEM中、37℃、10%CO2条件下にて数日間培養した。pCAG-Cre、pCMV-tTA(Takara)及びpCMV-DsRed(Takara)をLipofectamine(登録商標)LTX & Plus reagent(Life Technologies)を用いて細胞にコトランスフェクトし、EGFPの発現を蛍光顕微鏡にて確認した。
[結果]
(in vitro切断アッセイ)
1.濃度の検討結果
結果を図3-1に示す。
2.crRNA断片長の検討結果
結果を図3-2に示す。
(ノックインマウスの作製)
CRISPR/CASシステムにて一般的に用いられるRNA量「0.061pmol/μL」にてcrRNA断片及びtracrRNA断片を、Cas9タンパク質及びpActb-TetO-FLEX-EGFP-polyAと共に受精卵の前核に注入した結果、9匹の産仔を得ることができた。得られた産仔についてPCRスクリーニングしたところ、Actb遺伝子座にTetO-FLEX-EGFP-polyAカセットを保有するマウスは確認できなかった(下記表4)。
得られたノックインマウス及び野生型マウスの耳介より採取した繊維芽細胞をそれぞれ培養し、これにpCAG-Cre、pCMV-tTA及びpCMV-DsRedをコトランスフェクトしたところ、ノックインマウスに由来する繊維芽細胞においてEGFPの蛍光が観察された(図5:矢頭)。特に、ノックインアレルをホモ接合に有するマウスにおいて強いシグナルが確認された。
Claims (11)
- 標的DNA領域へ遺伝子又は塩基配列が挿入されたマウスの作製方法であって、Cas9タンパク質、標的DNA領域と相補的な塩基配列を含むcrRNA断片及びtracr RNA断片、ならびに該遺伝子又は塩基配列を含むドナーDNAをマウスの卵母細胞に導入し、該標的DNA領域へ該遺伝子又は塩基配列を挿入することを含み、
ここで、該crRNA断片は30~42塩基長であり、該tracr RNA断片は24~69塩基長であり、該Cas9タンパク質を30ng/μL以上の濃度で、かつcrRNA断片及びtracr RNA断片をそれぞれ0.6pmol/μL以上の濃度で用いる、上記方法。 - 遺伝子改変された非ヒト哺乳動物の作製方法であって、Cas9タンパク質、標的DNA領域と相補的な塩基配列を含むcrRNA断片及びtracr RNA断片を非ヒト哺乳動物の卵母細胞に導入し、該標的DNAを遺伝子改変することを含む、上記方法。
- 非ヒト哺乳動物が、げっ歯類より選択される、請求項2に記載の方法。
- 卵母細胞が受精卵である、請求項2又は3に記載の方法。
- crRNA断片が、標的DNAと相補的な塩基配列、及び配列番号2で表される塩基配列もしくはその変異配列を含む、請求項2~4のいずれか1項に記載の方法。
- tracr RNA断片が、配列番号4で表される塩基配列もしくはその変異配列を含む、請求項2~5のいずれか1項に記載の方法。
- Cas9タンパク質、crRNA断片及びtracr RNA断片が複合体を形成している、請求項2~6のいずれか1項に記載の方法。
- 遺伝子改変が標的DNA領域への遺伝子又は塩基配列の挿入であり、Cas9タンパク質、crRNA断片及びtracr RNA断片と共に、該遺伝子又は塩基配列を含むドナーDNAを非ヒト哺乳動物の卵母細胞に導入することを含む、請求項2~7のいずれか1項に記載の方法。
- Cas9タンパク質1ng/μLに対し、crRNA断片及びtracr RNA断片をそれぞれ0.002pmol/μLを超える濃度で用いる、請求項2~8のいずれか1項に記載の方法。
- 標的DNAと相補的な塩基配列、及び配列番号2で表される塩基配列もしくはその変異配列を含み、42塩基以下の塩基配列からなるcrRNA断片;ならびに/あるいは
配列番号4で表される塩基配列もしくはその変異配列を含み、69塩基以下の塩基配列からなるtracr RNA断片、
を含む標的DNAを遺伝子改変するためのキット。 - Cas9タンパク質、及び/又は、標的DNA領域へ挿入するための遺伝子もしくは塩基配列を含むドナーDNAをさらに含む、請求項10に記載のキット。
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2017148077A (ja) | 2017-08-31 |
| US20170354130A1 (en) | 2017-12-14 |
| JP6888213B2 (ja) | 2021-06-16 |
| US11470826B2 (en) | 2022-10-18 |
| JPWO2016080097A1 (ja) | 2017-04-27 |
| JP6190995B2 (ja) | 2017-09-06 |
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