WO2015068785A1 - 核酸挿入用ベクター - Google Patents
核酸挿入用ベクター Download PDFInfo
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- WO2015068785A1 WO2015068785A1 PCT/JP2014/079515 JP2014079515W WO2015068785A1 WO 2015068785 A1 WO2015068785 A1 WO 2015068785A1 JP 2014079515 W JP2014079515 W JP 2014079515W WO 2015068785 A1 WO2015068785 A1 WO 2015068785A1
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- vector
- nucleotide sequence
- nucleic acid
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- nuclease
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/85—Vectors or expression systems specially adapted for eukaryotic hosts for animal cells
- C12N15/8509—Vectors or expression systems specially adapted for eukaryotic hosts for animal cells for producing genetically modified animals, e.g. transgenic
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/10—Processes for the isolation, preparation or purification of DNA or RNA
- C12N15/102—Mutagenizing nucleic acids
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/87—Introduction of foreign genetic material using processes not otherwise provided for, e.g. co-transformation
- C12N15/90—Stable introduction of foreign DNA into chromosome
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K2217/00—Genetically modified animals
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K2227/00—Animals characterised by species
- A01K2227/50—Amphibians, e.g. Xenopus
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2510/00—Genetically modified cells
Definitions
- the present invention relates to a method for inserting a desired nucleic acid into a predetermined site in a nucleic acid in a cell, a vector and kit for the method, and a cell obtained by the method. Furthermore, the present invention relates to an organism containing cells containing a desired nucleic acid and a method for producing the same.
- TALEN TALE Nuclease
- ZFN Zinc Finger Nuclease
- polypeptides containing a plurality of nuclease subunits composed of a DNA binding domain and a DNA cleavage domain Patent Documents 1 to 4, Non-Patent Document 1). These artificial nucleases cause double-strand breakage of DNA by forming a multimer in the vicinity of a plurality of DNA cleavage domains at the binding site of the DNA binding domain.
- the DNA binding domain repeatedly includes a plurality of DNA binding modules, and each DNA binding module recognizes a specific base pair in the DNA strand.
- Non-patent Document 2 RNA-induced nucleases
- Fokl RNA-induced Fokl that fuses CRISPR / Cas system and Fokl nuclease.
- Nuclease (Fokl-dCas9) (Non-patent Document 3) is known.
- Various genetic modifications such as deletion, insertion, and mutagenesis of genes on genomic DNA have been performed by utilizing errors and recombination that occur during repair of cleavage by these nucleases (Patent Document 5). ⁇ 6, see Non-Patent Document 4).
- Non-Patent Documents 5 to 8 As methods for inserting a desired nucleic acid into a cell using an artificial nuclease, methods described in Non-Patent Documents 5 to 8 are known.
- Non-Patent Document 5 describes a method of inserting foreign DNA by homologous recombination using TALEN.
- Non-Patent Document 6 describes a method of inserting foreign DNA by homologous recombination using ZFN.
- vectors utilizing homologous recombination are long and cannot be easily produced.
- homologous recombination efficiency may be low depending on a cell or a biological species, these methods can be used only for limited cells and biological species.
- Non-Patent Documents 7 and 8 are methods for inserting nucleic acids into cells using artificial nucleases without using homologous recombination.
- Non-Patent Document 7 uses ZFN and TALEN to cleave a nucleic acid in a cell and the foreign DNA to be inserted, and connects the cleavage sites of both by the action of non-homologous end joining (NHEJ).
- NHEJ non-homologous end joining
- a method of insertion is disclosed.
- the orientation of the nucleic acid to be inserted is not controlled, and the joint of the nucleic acid to be inserted is not accurate.
- Non-Patent Document 8 in order to enable orientation control and accurate ligation, a single-stranded end generated from intracellular nucleic acid by nuclease cleavage and a single-stranded end generated from foreign DNA Are connected to each other by annealing.
- heterodimer-type ZFN and TALEN must be used to prevent re-cleavage of DNA after insertion, and a highly active homodimer-type artificial nuclease is used. I can't.
- the method described in Non-Patent Document 8 is not used for inserting a desired nucleic acid into an animal embryo.
- Non-Patent Document 8 has a high frequency of annealing of single-stranded ends to wrong places, and the frequency of obtaining cells that have been correctly inserted was not high.
- Non-Patent Documents 5 to 8 do not describe a method using an RNA-induced nuclease such as CRISPR / Cas system or an RNA-induced Fok nuclease such as FokI-dCas9.
- the present invention accurately and easily inserts a desired nucleic acid into a predetermined site of nucleic acids in cells of various biological species without requiring complicated steps such as preparation of a long-chain vector.
- the present inventors pay attention to a region consisting of a first nucleotide sequence and a region consisting of a second nucleotide sequence sandwiching a predetermined site for inserting a nucleic acid, and these contained in nucleic acids in a cell A nuclease was designed that specifically cleaves the region.
- the present inventors include, in order from the 5 ′ end to the 3 ′ end, a region consisting of the first nucleotide sequence, a desired nucleic acid intended for insertion, and a region consisting of the second nucleotide sequence. Vector designed.
- the present inventors introduced the designed vector into a cell, and caused the nuclease to act on the cell to cause cleavage at the predetermined site in the nucleic acid in the cell. Further, a nuclease is allowed to act on the vector so that a region consisting of the first nucleotide sequence, the desired nucleic acid, and a region consisting of the second nucleotide sequence are sequentially arranged from the 5 ′ end to the 3 ′ end. A nucleic acid fragment containing was generated.
- the first nucleotide sequence in the nucleic acid in the cell and the first nucleotide sequence in the vector are linked by microhomology-mediated binding (MMEJ), and the second nucleotide sequence in the nucleic acid in the cell And the second nucleotide sequence in the vector were linked by MMEJ.
- MMEJ microhomology-mediated binding
- the nuclease used is to specifically cleave the region consisting of the first nucleotide sequence and the portion consisting of the second nucleotide sequence contained in the intracellular nucleic acid before insertion, The nucleic acid after ligation has lost a part of the portion due to the insertion of the desired nucleic acid. Therefore, the nucleic acid was stably retained without being cleaved again by the nuclease present in the cell, and insertion of the desired nucleic acid occurred frequently.
- this method since ligation is performed by microhomology-mediated end joining that functions in many cells, the desired nucleic acid can be accurately and frequently used even in developmental cells with low homologous recombination efficiency. A wide range of organisms and cell types that can be inserted and applied. Moreover, this method can simultaneously insert a vector for introducing a nuclease and a vector for inserting a nucleic acid into a cell, and is easy to operate. Furthermore, since the method can prevent re-cleavage of the nucleic acid after insertion by changing the portion of the nucleic acid in the cell by microhomology-mediated end joining, it is highly active as a DNA cleavage domain contained in the nuclease. A homodimer type domain can also be used, and the choice of experimental materials is wide.
- the present invention is a vector for inserting a desired nucleic acid into a predetermined site in a nucleic acid contained in a cell by a nuclease
- the nucleic acid contained in the cell includes, in order from the 5 ′ end to the 3 ′ end, a region consisting of the first nucleotide sequence, the predetermined site, and a region consisting of the second nucleotide sequence
- the nuclease specifically cleaves a region consisting of the first nucleotide sequence contained in the cell and a portion consisting of the region consisting of the second nucleotide sequence
- the vector includes, in order from the 5 ′ end to the 3 ′ end, a region consisting of a first nucleotide sequence, the desired nucleic acid, and a region consisting of a second nucleotide sequence.
- Vector includes, in order from the 5 ′ end to the 3 ′ end, a region consisting of a first nucleotide sequence, the
- the present invention provides a vector for inserting a desired nucleic acid at a predetermined site in a nucleic acid contained in a cell by a nuclease containing a first DNA binding domain and a second DNA binding domain.
- the nucleic acid contained in the cell includes, in order from the 5 ′ end to the 3 ′ end, a region consisting of the first nucleotide sequence, the predetermined site, and a region consisting of the second nucleotide sequence,
- the region consisting of the first nucleotide sequence, the predetermined site, and the region consisting of the second nucleotide sequence are regions consisting of the nucleotide sequence recognized by the first DNA binding domain, respectively.
- the vector includes, in order from the 5 ′ end to the 3 ′ end, a region consisting of the first nucleotide sequence, the desired nucleic acid, and a region consisting of the second nucleotide sequence,
- the region consisting of the first nucleotide sequence and the region consisting of the second nucleotide sequence are respectively divided into a region consisting of the nucleotide sequence recognized by the first DNA binding domain and a second DNA binding domain.
- the vector Between the recognized nucleotide sequence and The vector generates, in the direction from the 5 ′ end to the 3 ′ end, the nucleic acid fragment containing the region consisting of the first nucleotide sequence, the desired nucleic acid, and the region consisting of the second nucleotide sequence in the direction from the 5 ′ end to the 3 ′ end. Is what Vector.
- the present invention provides the first nucleotide sequence in the nucleic acid contained in the cell and the first nucleotide sequence in the vector linked by microhomology-mediated binding (MMEJ) and contained in the cell.
- MMEJ microhomology-mediated binding
- the present invention also provides the vector according to the second aspect, in the fourth aspect, wherein the nuclease is a homodimeric nuclease and the vector is a circular vector.
- the present invention also provides, in the fifth aspect, the vector according to the first aspect, wherein the nuclease is a Cas9 nuclease.
- the present invention also provides, in the sixth aspect, the vector according to the second aspect, wherein the nuclease is TALEN.
- the present invention is the kit for inserting a desired nucleic acid into a predetermined site in a nucleic acid contained in a cell according to the seventh aspect, wherein any one of the first aspect to the sixth aspect is provided.
- a kit comprising the described vector and a vector for expressing a nuclease is provided.
- the present invention is the method according to any one of the first aspect to the sixth aspect, wherein the desired nucleic acid is inserted into a predetermined site in the nucleic acid contained in the cell in the eighth aspect.
- the present invention provides a method comprising introducing a vector and a vector for expressing a nuclease into a cell.
- the present invention provides a cell obtained by the method described in the eighth aspect.
- the present invention provides, in the tenth aspect, an organism including the cell according to the ninth aspect.
- the present invention also provides, in the eleventh aspect, a method for producing a living organism containing a desired nucleic acid, comprising the step of differentiating cells obtained by the method according to the eighth aspect.
- this invention provides the organism manufactured by the method as described in the 11th aspect in the 12th aspect.
- nucleic acids in cells of a wide variety of biological species can be used without requiring complicated steps such as preparation of a long-chain vector and regardless of the efficiency of homologous recombination in cells and biological species.
- the desired nucleic acid can be inserted accurately and simply into the predetermined site without causing frame shift, and a nucleic acid having a relatively long chain of several kb or more can also be inserted.
- the nucleic acid insertion method using the vector of the present invention can be used in combination with a nuclease containing a homodimeric DNA cleavage domain having high nuclease activity.
- the nucleic acid insertion method using the vector of the present invention can also be used in combination with an RNA-induced nuclease such as the CRISPR / Cas system.
- an RNA-induced nuclease such as the CRISPR / Cas system.
- the vector of the present invention is used, the seam can be accurately designed and the functional domain can be knocked in frame. Therefore, if a nucleic acid containing a marker gene is used, the expression of the gene can be controlled. By detecting, the organism in which the target insertion has occurred can be easily identified, and the organism in which the desired nucleic acid has been inserted can be easily and frequently obtained.
- the nucleic acid insertion method using the vector of the present invention can be used for undifferentiated cells such as animal embryos having low homologous recombination efficiency
- the desired nucleic acid can be added to undifferentiated cells using the vector of the present invention. Is inserted, and the obtained undifferentiated cells are differentiated, whereby an adult organism stably holding a desired nucleic acid can be easily obtained.
- FIG. 1 shows a schematic diagram of target integration into a tyr locus when an entire vector containing the desired nucleic acid is inserted using TALEN.
- FIG. 2 shows a schematic diagram when a part of a vector containing a desired nucleic acid is inserted using TALEN.
- FIG. 3 shows a schematic diagram of the vector design of the present invention using the CRISPR / Cas system.
- FIG. 4a shows a schematic diagram when the entire vector containing the desired nucleic acid is inserted using the CRISPR / Cas system.
- FIG. 4b shows a schematic diagram when the entire vector containing the desired nucleic acid is inserted using the CRISPR / Cas system.
- FIG. 5 shows a schematic diagram when a whole vector containing a desired nucleic acid is inserted using Fok1-dCas9.
- FIG. 6 shows the phenotype of embryos microinjected with TALEN and a target integration vector (TAL-PITCh vector).
- FIG. 6 shows bright field images (upper) and GFP fluorescence images (lower) of TALEN R + vector-injected embryos (negative control group; A) and TALEN mix + vector-injected embryos (experimental group; B).
- FIG. 7 shows the percentage of phenotype in the negative control group and the experimental group. Except for abnormally developing embryos (grey, Abnormal), the phenotype was classified into four (Full, Half, Mosaic, Non).
- FIG. 8 shows detection of introduction of a donor vector (TAL-PITCh vector) into a target locus.
- the lower figure is an electrophoresis photograph of a PCR product using a primer set on the upstream and downstream of the target sequence of tyrTALEN and on the vector side.
- the upper figure shows the position of the primers.
- the arrow indicates a band indicating that the vector has been integrated.
- the numbers correspond to the individual numbers in FIG. 9A and 9B show the sequence analysis of the junction between the insertion site and the donor vector (TAL-PITCh vector). No.
- the results of sequencing PCR products (Fig. 8; 5 'side and 3' side) derived from 3 and 4 (Fig.
- FIG. 10 is a schematic diagram of target integration of HEK293T cells into the FBL locus using the CRISPR / Cas system.
- FIG. 11A and FIG. 11B show the full length sequence of the donor vector (CRIS-PITCh vector).
- FIG. 12 is an mNeonGreen fluorescence image showing the phenotype of HEK293T cells into which a vector expressing three types of gRNA and Cas9 and a donor vector (CRIS-PITCh vector) are co-introduced.
- FIG. 13 shows a sequence analysis of the junction between the insertion site and the donor vector (CRIS-PITCh vector). The sequence expected when introduced in an MMEJ-dependent manner is shown in the upper part. Deletions are indicated by a dashed line (-), insertions are indicated by double underlines, and substitutions are indicated by underlines.
- the vector provided by the present invention of the first aspect is for inserting a desired nucleic acid into a predetermined site in a nucleic acid contained in a cell.
- nucleic acids contained in cells include cell genomic DNA.
- cell origin include humans; non-human mammals such as cows, minipigs, pigs, sheep, goats, rabbits, dogs, cats, guinea pigs, hamsters, mice, rats, monkeys; birds; fish such as zebrafish; Amphibians; reptiles; insects such as Drosophila; crustaceans.
- Examples of cell origin include plants such as Arabidopsis thaliana.
- the cell may be a cultured cell.
- the cells may be immature cells having the ability to differentiate into highly mature tissue cells such as embryonic stem cells (ES cells) and pluripotent stem cells such as induced pluripotent stem cells (iPS cells). Good. Embryonic stem cells and induced pluripotent stem cells can proliferate indefinitely and are useful as a large-scale source of functional cells.
- ES cells embryonic stem cells
- iPS cells induced pluripotent stem cells
- a cell into which the vector of the present invention of the first aspect is inserted is, in the direction from the 5 ′ end to the 3 ′ end, in order, a region consisting of the first nucleotide sequence, a predetermined site intended to insert a nucleic acid, And a nucleic acid comprising a region consisting of a second nucleotide sequence.
- the first nucleotide sequence and the second nucleotide sequence are convenient notations for showing the relationship with the sequence contained in the vector to be inserted.
- the first nucleotide sequence and the second nucleotide sequence may be directly adjacent to the predetermined site, or may be adjacent to each other via a region consisting of a specific base sequence.
- the specific base sequence is preferably 1 to 7 bases in length, more preferably 1 to 3 bases in length.
- the first nucleotide sequence is preferably 3 to 10 bases long, more preferably 4 to 8 bases long, and further preferably 5 to 7 bases long.
- the second nucleotide sequence is preferably 3 to 10 bases long, more preferably 4 to 8 bases long, and further preferably 5 to 7 bases long.
- the vector provided by the present invention of the first aspect is for inserting a desired nucleic acid into a predetermined site in a nucleic acid contained in a cell by a nuclease.
- the nuclease is specifically cleaved for a region consisting of the first nucleotide sequence and a portion consisting of the second nucleotide sequence contained in the cell. Is to do.
- Such nucleases include nucleases comprising a first DNA binding domain and a second DNA binding domain, which are provided by the invention of the second aspect of the specification. This will be explained in the place where the vector is explained.
- RNA-induced nucleases such as nucleases by the CRISPR / Cas system.
- Cas9 nuclease examples include SpCas9 derived from Streptococcus pyogenes and StCas9 derived from Streptococcus thermophilus.
- SpCas9 PAM is a “5′-NGG-3 ′” sequence (N is an arbitrary nucleotide), and the position where double strand break occurs is located 3 bases upstream (5 ′ end side) from PAM.
- the guide RNA (gRNA) in the CRISPR / Cas system recognizes a base sequence located on the 5 'side where double-strand breaks occur. And the location where double-strand breaks in the CRISPR / Cas system correspond to the predetermined site for insertion of a desired nucleic acid in the nucleic acid contained in the cell. At both ends of the predetermined site, there are a region composed of the first nucleotide sequence and a region composed of the second nucleotide sequence.
- the CRISPR / Cas system that uses gRNA that recognizes a base sequence located 5 'to the PAM contained in a nucleic acid in a cell is composed of a region consisting of a first nucleotide sequence and a region consisting of a second nucleotide sequence. Specific cleavage can be performed on the part.
- the vector provided by the present invention of the first aspect comprises, in order from the 5 ′ end to the 3 ′ end, a region consisting of the first nucleotide sequence, a desired nucleic acid intended to be inserted into a cell, and It includes a region consisting of a second nucleotide sequence.
- the region consisting of the first nucleotide sequence contained in the vector is the same as the region consisting of the first nucleotide sequence in the nucleic acid contained in the cell.
- the region consisting of the second nucleotide sequence contained in the vector is the same as the region consisting of the second nucleotide sequence in the nucleic acid contained in the cell.
- FIG. 1 The relationship between the first nucleotide sequence and the second nucleotide sequence contained in the vector and the first nucleotide sequence and the second nucleotide sequence in the nucleic acid contained in the cell will be described using FIG. 1 as an example.
- AAcatgag contained in the TALEN site in FIG. 1 is the first nucleotide sequence.
- AA in the first nucleotide sequence is an overlapping portion between the nucleotide sequence recognized by the first DNA binding domain and the first nucleotide sequence.
- AttcagaA contained in the TALEN site in FIG. 1 is the second nucleotide sequence.
- the capital letter A in the second nucleotide sequence is the overlap between the second nucleotide sequence and the nucleotide sequence recognized by the second DNA binding domain.
- Attcagaa contained in the donor vector of FIG. 1 is the second nucleotide sequence.
- the capital letter A contained in the second nucleotide sequence is the overlapping portion of the nucleotide sequence recognized by the first DNA binding domain and the first nucleotide sequence.
- the aactogaa contained in the donor vector of FIG. 1 is the first nucleotide sequence.
- the sequences encoding CMV and EGFP contained in the donor vector of FIG. 1 are desired nucleic acids intended to be inserted into cells. As shown in the schematic diagram of the donor vector in FIG.
- the region consisting of the first nucleotide sequence (aacatgag) will be described in order, and the donor vector in FIG. 1 is directed from the 5 ′ end to the 3 ′ end. In turn, it includes a region consisting of a first nucleotide sequence, a desired nucleic acid intended to be inserted into a cell, and a region consisting of a second nucleotide sequence.
- the donor vector of FIG. 1 and the TALEN site of FIG. 1, in the TALEN site, the 3 ′ end of the first nucleotide sequence and the 5 ′ end of the second nucleotide sequence are adjacent or in contact with each other.
- the 3 ′ end of the second nucleotide sequence and the 5 ′ end of the first nucleotide sequence are adjacent or in contact.
- the positional relationship between the first nucleotide sequence and the second nucleotide sequence in the nucleic acid in the cell is reversed compared to these positional relationships in the vector.
- the donor vector of FIG. 1 is a circular vector, and that the nuclease cleaves the part containing the region consisting of the first nucleotide sequence and the region consisting of the second nucleotide sequence in the vector. caused by.
- the vector of the first aspect of the present invention is preferably a circular vector.
- the vector of the first aspect of the present invention is a circular vector
- the 5 ′ ends are preferably adjacent or directly linked.
- the vector of the first aspect of the present invention is a circular vector and the second nucleotide sequence and the first nucleotide sequence are adjacent to each other, the 3 ′ end of the second nucleotide sequence,
- the 5 ′ end of the nucleotide sequence is preferably separated by a region consisting of a base sequence having a length of 1 to 7 bases, more preferably 1 to 5 bases, and even more preferably 1 to 3 bases.
- the vector provided by the present invention of the second aspect is for inserting a desired nucleic acid by a nuclease containing a first DNA binding domain and a second DNA binding domain.
- the DNA binding domain preferably comprises one or more DNA binding modules that specifically recognize base pairs, continuously from the N-terminal side. One DNA binding module specifically recognizes one base pair. Therefore, each of the first DNA binding domain and the second DNA binding domain recognizes a region consisting of a specific nucleotide sequence.
- the nucleotide sequence recognized by the first DNA binding domain and the nucleotide sequence recognized by the second DNA binding domain may be the same or different.
- the number of DNA binding modules contained in the DNA binding domain is preferably 8 to 40, more preferably 12 to 40, from the viewpoint of compatibility between the high nuclease activity of the DNA cleavage domain and the high specificity of DNA sequence recognition. 25, and even more preferably 15-20.
- Examples of the DNA binding module include TAL effector repeat (effect repeat).
- Examples of the length of one DNA binding module include 20 to 45, 30 to 38, 32 to 36, and 34.
- the length of the DNA binding module contained in the DNA binding domain is preferably the same for all DNA binding modules.
- the first DNA binding domain and the second DNA binding domain are preferably identical in origin, characteristics, and the like.
- Fokl-dCas9 When RNA-induced Fokl nuclease (Fokl-dCas9) is used, Fokl-dCas9 formed in a complex with gRNA corresponds to the nuclease containing the DNA binding domain in the second embodiment described above.
- dCas9 is Cas9 whose catalytic activity has been deactivated, and is guided by a gRNA that recognizes a base sequence located in the vicinity of where double-strand breakage occurs, and binds to a nucleic acid. That is, dCas9 that forms a complex with gRNA corresponds to the DNA-binding domain in the second embodiment described above.
- the nuclease comprising a first DNA binding domain and a second DNA binding domain is preferably a first nuclease subunit comprising a first DNA binding domain and a first DNA cleavage domain, and a second DNA binding domain And a second nuclease subunit comprising a second DNA cleavage domain.
- the first DNA-cleaving domain and the second DNA-cleaving domain are preferably close to each other to form a multimer after the first DNA-binding domain and the second DNA-binding domain each bind to DNA, Obtain improved nuclease activity.
- Examples of such a DNA cleavage domain include those derived from the restriction enzyme Fokl.
- the DNA cleavage domain may be a heterodimeric DNA cleavage domain or a homodimeric DNA cleavage domain.
- the first DNA cleavage domain and the second DNA cleavage domain are close to each other, a multimer is formed and an improved nuclease activity is obtained, but even if the first DNA cleavage domain and the first DNA cleavage domain are close to each other, A multimer is not formed, an improved nuclease activity is not obtained, and even if the second DNA cleavage domain and the second DNA cleavage domain are close to each other, a multimer is not formed and an improved nuclease activity is exhibited. If not obtained, the first DNA cleavage domain and the second DNA cleavage domain are heterodimeric DNA cleavage domains.
- the first DNA cleavage domain is a homodimeric DNA cleavage domain.
- a homodimer type DNA cleavage domain When a homodimer type DNA cleavage domain is used, generally high nuclease activity is obtained.
- the first DNA cleavage domain and the second DNA cleavage domain are preferably identical in origin, characteristics and the like.
- the first DNA binding domain and the first DNA cleavage domain are 20 to 70, 25 to 65, or 30 to 60, preferably 35 to 55, more preferably Are connected by a polypeptide comprising 40 to 50, more preferably 45 to 49, and most preferably 47 amino acids.
- ZFN in the first nuclease subunit, the first DNA binding domain and the first DNA cleavage domain are 0 to 20, or 2 to 10, preferably 3 to 9, more preferably 4 to 8, More preferably, they are connected by a polypeptide consisting of 5 to 7 amino acids.
- dCas9 and Fokl are 1-20, 1-15, or 1-10, preferably 2-8, more preferably 3-7, still more preferably Are connected by a polypeptide consisting of 4 to 6, most preferably 5 amino acids.
- the first nuclease subunit connected by the polypeptide having such a length has high specificity for the length of the region consisting of the first nucleotide sequence and the portion consisting of the second nucleotide sequence, Since it specifically cleaves a spacer region of a specific length, the frequency of nucleic acid insertion into non-target sites due to non-specific cleavage is low, and ligation by microhomology-mediated end joining described below This is preferable because the frequency of subsequent re-cleavage of the nucleic acid is low.
- the region consisting of the first nucleotide sequence is a region consisting of the nucleotide sequence recognized by the first DNA binding domain And a region consisting of a nucleotide sequence recognized by the second DNA binding domain.
- the region composed of the second nucleotide sequence is between the region composed of the nucleotide sequence recognized by the first DNA binding domain and the region composed of the nucleotide sequence recognized by the second DNA binding domain.
- the predetermined site is between a region consisting of a nucleotide sequence recognized by the first DNA binding domain and a region consisting of a nucleotide sequence recognized by the second DNA binding domain.
- the combination of two nucleotide sequences recognized by the DNA binding domain surrounding the region consisting of the first nucleotide sequence is the two nucleotide sequences recognized by the DNA binding domain surrounding the region consisting of the second nucleotide sequence.
- the combination may be different.
- different nucleases are used for the nuclease for cleaving the periphery of the region consisting of the first nucleotide sequence and the nuclease for cleaving the periphery of the region consisting of the second nucleotide sequence.
- the region consisting of the nucleotide sequence recognized by the first DNA binding domain and the region consisting of the nucleotide sequence recognized by the second DNA binding domain are preferably 5 to 40 bases long More preferably, the regions are separated by a region consisting of a nucleotide sequence having a length of 10 to 30 bases, more preferably 12 to 20 bases.
- the base length of the region separating the two may be the same as or different from the total base length of the base length of the first nucleotide sequence and the base length of the second nucleotide sequence.
- the nucleotide sequence recognized by the first DNA binding domain wherein the 3 ′ end of the first nucleotide sequence and the 5 ′ end of the second nucleotide sequence are in direct contact with each other.
- the base length of the region separating the two is the same as the total base length of the base length of the first nucleotide sequence and the base length of the second nucleotide sequence.
- the base length of the region separating the two is the sum of the base length of the first nucleotide sequence and the base length of the second nucleotide sequence. Different from base length.
- the region consisting of the first nucleotide sequence may partially overlap with the region consisting of the nucleotide sequence recognized by the first DNA binding domain.
- the region consisting of the second nucleotide sequence may partially overlap with the region consisting of the nucleotide sequence recognized by the second DNA binding domain.
- the overlapping portion preferably consists of a nucleotide sequence having a length of 1 to 6 bases, more preferably 1 to 5 bases, and even more preferably 2 to 4 bases.
- the region consisting of the first nucleotide sequence and the region consisting of the second nucleotide sequence each consist of a nucleotide sequence recognized by the first DNA binding domain Between the region and the region consisting of the nucleotide sequence recognized by the second DNA binding domain.
- the combination of two nucleotide sequences recognized by the DNA binding domain surrounding the region consisting of the first nucleotide sequence is the two nucleotide sequences recognized by the DNA binding domain surrounding the region consisting of the second nucleotide sequence. The combination may be different.
- nucleases are used for the nuclease for cleaving the periphery of the region consisting of the first nucleotide sequence and the nuclease for cleaving the periphery of the region consisting of the second nucleotide sequence.
- the region consisting of the nucleotide sequence recognized by the first DNA binding domain may be present on the 5 ′ end side as compared to the region consisting of the nucleotide sequence recognized by the second DNA binding domain. It may exist on the 3 ′ end side.
- the nucleotide sequence located at the 3 ′ end of the first nuclease sequence and recognized by the first DNA binding domain or the second DNA binding domain is the second nucleotide in the nucleic acid contained in the cell. It is preferably different from the sequence located on the 3 ′ end side of the sequence and recognized by the first DNA binding domain or the second DNA binding domain.
- the nucleotide sequence located on the 5 ′ end side of the second nuclease sequence and recognized by the first DNA binding domain or the second DNA binding domain is the first nucleotide in the nucleic acid contained in the cell. It is preferably different from the sequence located on the 5 ′ end side of the sequence and recognized by the first DNA binding domain or the second DNA binding domain.
- the frequency of re-cleavage that occurs after insertion of the desired nucleic acid can be further reduced by using a nuclease containing a heterodimeric DNA cleavage domain in combination.
- the vector may be one that generates one cleavage site by one or more nucleases including the first DNA binding domain and the second DNA binding domain, or one that generates two or more cleavage sites. It may be.
- a region consisting of a nucleotide sequence recognized by the first DNA binding domain in order a region consisting of the first nucleotide sequence
- a region consisting of the first nucleotide sequence A region consisting of a nucleotide sequence recognized by a second DNA binding domain, a desired nucleic acid intended to be inserted into a cell, a region consisting of a nucleotide sequence recognized by a first DNA binding domain, a second nucleotide
- a vector comprising a region consisting of a sequence and a region consisting of a nucleotide sequence recognized by a second DNA binding domain.
- a region separating a region consisting of a nucleotide sequence recognized by the first DNA binding domain and a region consisting of a nucleotide sequence recognized by the second DNA binding domain The region comprising the first nucleotide sequence or the region comprising the second nucleotide sequence preferably has a length of 5 to 40 bases, more preferably 10 to 30 bases, still more preferably It consists of a nucleotide sequence having a length of 12 to 20 bases.
- a region separating a region consisting of a nucleotide sequence recognized by the first DNA binding domain from a region consisting of a nucleotide sequence recognized by the second DNA binding domain is a first nucleotide sequence and a second nucleotide sequence
- the base length of the separated region is the same as or substantially the same as the base length of the first nucleotide sequence and the total base length of the second nucleotide sequence.
- the first nucleotide sequence is preferably 3 to 10 bases long, more preferably 4 to 8 bases long, and further preferably 5 to 7 bases long.
- the second nucleotide sequence is preferably 3 to 10 bases long, more preferably 4 to 8 bases long, and further preferably 5 to 7 bases long. . If there is an overlap between the region consisting of the first nucleotide sequence or the second nucleotide sequence and the region consisting of the nucleotide sequence recognized by the DNA binding domain, the region consisting of the first nucleotide sequence and the second nucleotide sequence When there is an overlap with the region, or when the region consisting of the first nucleotide sequence and the region consisting of the second nucleotide sequence are not directly connected, the base length of the separated region is the first It is not the same as the total base length of the nucleotide length of the nucleotide sequence and the base length of the second nucleotide sequence, but is generally the same.
- the first nucleotide sequence in the nucleic acid contained in the cell and the first nucleotide sequence in the vector are by microhomology-mediated binding (MMEJ).
- MMEJ microhomology-mediated binding
- the second nucleotide sequence in the nucleic acid contained in the cell and the second nucleotide sequence in the vector are joined together by MMEJ so that the desired nucleic acid is at a predetermined site in the nucleic acid contained in the cell. Inserted.
- the nuclease is a homodimeric nuclease
- the vector is a circular vector.
- the nuclease is an RNA-induced nuclease such as a nuclease by CRISPR / Cas system.
- the nuclease is a Cas9 nuclease.
- the nuclease is preferably ZFN, TALEN or FokI-dCas9, more preferably TALEN.
- ZFN, TALEN or FokI-dCas9 may be homodimeric or heterodimeric.
- the nuclease is preferably a homodimer type ZFN, TALEN or FokI-dCas9, more preferably a homodimer type TALEN.
- nuclease includes those mutants. Such a mutant may be any as long as it exhibits the activity of the nuclease. Such mutants include, for example, several in the amino acid sequence of the nuclease, such as 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35. Nucleases containing amino acid sequences in which 40, 45, or 50 amino acids have been substituted, deleted and / or added.
- the desired nucleic acid contained in the vector provided by the present invention may be, for example, 10 to 10,000 bases long or several kilobases long.
- the desired nucleic acid may include a nucleic acid encoding a gene.
- the encoded gene can be any gene, for example, a gene encoding an enzyme that converts a chemiluminescent substrate such as alkaline phosphatase, peroxidase, chloramphenicol acetyltransferase, ⁇ -galactosidase and the like.
- the desired nucleic acid may include a nucleic acid encoding a gene whose expression can be detected by a light signal.
- GFP green fluorescent protein
- hrGFP humanized Renilla green fluorescent protein
- eGFP enhanced green fluorescent protein
- mNeonGreen yellow-green fluorescent protein
- fluorescent proteins such as protein (eBFP), enhanced cyan fluorescent protein (eCFP), enhanced yellow fluorescent protein (eYFP), red fluorescent protein (RFP or DsRed); bioluminescent proteins such as firefly luciferase and Renilla luciferase Examples include the gene to be encoded.
- eBFP protein
- eCFP enhanced cyan fluorescent protein
- eYFP enhanced yellow fluorescent protein
- RFP or DsRed red fluorescent protein
- bioluminescent proteins such as firefly luciferase and Renilla luciferase Examples include the gene to be encoded.
- the region consisting of the first nucleotide sequence and the desired nucleic acid are preferably directly adjacent to each other.
- the region consisting of the desired nucleic acid and the second nucleotide sequence is preferably directly adjacent.
- the desired nucleic acid contains a functional factor such as a gene
- the first nucleotide sequence and the second nucleotide sequence contained in the vector encode a part of the functional factor. There may be.
- the vector provided by the present invention may be a circular vector or a linear vector.
- the vector provided by the present invention is a circular vector.
- the vector of the present invention include plasmid vectors, cosmid vectors, virus vectors, artificial chromosome vectors and the like.
- the artificial chromosome vector include yeast artificial chromosome vector (YAC), bacterial artificial chromosome vector (BAC), P1 artificial chromosome vector (PAC), mouse artificial chromosome vector (MAC), and human artificial chromosome vector (HAC).
- yeast artificial chromosome vector YAC
- BAC bacterial artificial chromosome vector
- PAC P1 artificial chromosome vector
- MAC mouse artificial chromosome vector
- HAC human artificial chromosome vector
- vector components include nucleic acids such as DNA and RNA, and nucleic acid analogs such as GNA, LNA, BNA, PNA, and TNA.
- the vector may be modified with components other than nucleic acids such as sugars
- the present invention provides a kit for inserting a desired nucleic acid into a predetermined site in a nucleic acid contained in a cell.
- the kit of the present invention in the seventh aspect includes the vector of the present invention according to any one of the first to sixth aspects.
- the kit of the present invention in the seventh aspect includes a vector for expressing a nuclease.
- Examples of the vector for expressing a nuclease include a vector for expressing a nuclease including a first DNA binding domain and a second DNA binding domain.
- Examples of the vector for expressing the nuclease include plasmid vectors, cosmid vectors, virus vectors, artificial chromosome vectors, and the like.
- Examples of the vector for expressing the nuclease include a first vector containing a gene encoding a first nuclease subunit containing a first DNA binding domain and a first DNA cleavage domain, and a second DNA.
- a vector set comprising a second vector comprising a gene encoding a second nuclease subunit comprising a binding domain and a second DNA cleavage domain.
- the vector containing both the gene which codes the said 1st nuclease subunit, and the gene which codes the said 2nd nuclease subunit is mentioned.
- the first vector and the second vector may be present in different nucleic acid fragments, or may be present in the same nucleic acid fragment.
- the kit of the present invention of the aspect includes a plurality of vector sets composed of the first vector and the second vector described above.
- the kit of the present invention of the seventh aspect is a gRNA that cuts the vicinity of the region consisting of the first nucleotide sequence in the vector of the present invention of the first aspect.
- a vector for expressing a nuclease a vector for expressing a gRNA and a nuclease that cleave in the vicinity of the region consisting of the second nucleotide sequence in the vector of the present invention of the first aspect, and a predetermined nucleic acid contained in a cell
- a vector for expressing a gRNA for cleaving the site and a nuclease may be included.
- a vector for expressing a nuclease by the CRISPR / Cas system may include a vector for expressing gRNA and a vector for expressing Cas9 per cleavage.
- the vector for expressing gRNA and Cas9 described above may be a vector containing both a gene encoding gRNA and a gene encoding Cas9. Alternatively, it may be a vector set comprising a vector containing a gene encoding gRNA and a vector containing a gene encoding Cas9. A plurality of vectors having different functions may be present on the same nucleic acid fragment or on different nucleic acid fragments.
- the present invention provides a method for inserting a desired nucleic acid into a predetermined site in a nucleic acid contained in a cell.
- the method of the present invention of the eighth aspect includes the step of introducing the vector of any one of the first to sixth aspects of the present invention and a vector for expressing a nuclease into a cell.
- the vector for expressing a nuclease include a vector for expressing a nuclease containing a first DNA binding domain and a second DNA binding domain as described above.
- a vector set comprising a second vector containing a gene encoding the second nuclease subunit can be mentioned.
- the introduction into a cell may be carried out by contacting these vectors with cells cultured in vitro, or by administering these vectors to a living body and contacting them indirectly with cells existing in the living body. You may go. These vectors can be introduced into the cells simultaneously or separately.
- a vector for expressing a nuclease is introduced into the cell in advance to produce a stable expression strain or inducible expression strain of the nuclease, and then the produced stable expression.
- the vector of the present invention according to any one of the first to sixth aspects may be introduced into a strain or an inducible expression strain.
- a nuclease such as a nuclease containing the first DNA binding domain and the second DNA binding domain functions in the cell, and the 3 ′ In the 'terminal direction, a nucleic acid fragment is generated which in turn comprises a region consisting of a first nucleotide sequence, a desired nucleic acid intended for insertion and a region consisting of a second nucleotide sequence.
- the above process causes cleavage at a predetermined site in the nucleic acid in the cell.
- the first nucleotide sequence in the nucleic acid in the cell and the first nucleotide sequence in the vector are linked by microhomology-mediated binding (MMEJ), and the second nucleotide sequence in the nucleic acid in the cell And the second nucleotide sequence in the vector are linked by MMEJ.
- MMEJ microhomology-mediated binding
- the desired nucleic acid is accurately inserted into a predetermined site of the nucleic acid of the cell.
- the nuclease used in combination is a portion consisting of a region consisting of the first nucleotide sequence and a region consisting of the second nucleotide sequence contained in the intracellular nucleic acid before insertion.
- the nucleic acid after ligation does not contain the portion due to insertion of the desired nucleic acid.
- the nucleic acid after ligation does not contain the portion due to insertion of the desired nucleic acid.
- all gRNA target sequences lose the PAM sequence and the sequence of 3 bases adjacent to it. Therefore, the nucleic acid is stably retained without being cleaved again by a nuclease present in the cell, and insertion of a desired nucleic acid occurs frequently.
- the combination of the vector of the first aspect of the present invention and the CRISPR / Cas system in which the ligated nucleic acid loses the PAM sequence or the base adjacent thereto is the first nucleotide sequence contained in both, 2 nucleotide sequences and sequences adjacent to these nucleotide sequences can be appropriately designed.
- An example of the design is shown in FIG. 3 as a schematic diagram.
- the cleavage activity of a nuclease containing a plurality of DNA binding domains depends on the length of the spacer region sandwiched between the regions recognized by the DNA binding domain, and the nuclease is a spacer region having a specific length. Cleave specific for.
- the spacer region separating the two DNA binding domains is preferably composed of a nucleotide sequence having a length of 1 to 20 bases, more preferably 2 to 15 bases, and further preferably 3 to 10 bases. .
- the vector for inserting the desired nucleic acid into a predetermined site in the nucleic acid contained in the cell and the vector for expressing the nuclease may be the same vector or different vectors. Also good.
- a vector for inserting a desired nucleic acid at a predetermined site in a nucleic acid contained in a cell, a vector for expressing a nuclease, and a vector for expressing a gRNA The same vector or different vectors may be used.
- FIG. 1 shows a schematic diagram when a whole vector containing a desired nucleic acid is inserted by TALEN.
- FIG. 2 shows a schematic view when a part of a vector containing a desired nucleic acid is inserted by TALEN.
- FIG. 3 shows a schematic view when a part of a vector containing a desired nucleic acid is inserted into a predetermined site in the intracellular nucleic acid by the CRISPR / Cas system.
- FIG. 4 shows a schematic diagram when the entire vector containing the desired nucleic acid is inserted by the CRISPR / Cas system.
- FIG. 5 shows a schematic view when the whole vector containing a desired nucleic acid is inserted by Fok1-dCas9.
- the present invention provides a cell obtained by the method of the present invention of the eighth aspect.
- the cell of the present invention of the ninth aspect can be obtained by selecting the cell in which the insertion has occurred after the introduction in the method of the eighth aspect.
- the cell is selected by detecting the expression of the reporter protein and using the detected expression level as an index. It is possible to carry out simply and frequently.
- the present invention provides an organism comprising the cell of the ninth aspect of the present invention.
- the method of the present invention of the eighth aspect when the vector is administered to a living body and indirect contact is made with cells present in the living body, the organism of the present invention of the tenth aspect is obtained.
- the present invention provides a method for producing an organism containing a desired nucleic acid, comprising the step of differentiating cells obtained by the method of the present invention in the eighth aspect.
- a vector is contacted with cells cultured in vitro to obtain cells containing the desired nucleic acid, and then the desired cells are differentiated by differentiating the obtained cells. Including adult organisms are produced.
- the present invention provides an organism produced by the method of the eleventh aspect of the present invention.
- the produced organism contains a desired nucleic acid at a predetermined site of a nucleic acid contained in a cell in the organism, and depending on the function of the desired nucleic acid, a biological substance such as a gene, protein, lipid, saccharide, etc. It can be used for various purposes such as functional analysis.
- Example 1 Target integration using TALEN
- an expression set of a fluorescent protein gene was introduced into Exon1 of Xenopus laevis tyrosinase (tyr) gene using TALEN and a donor vector (TAL-PITCh vector) ( Target integration).
- the TALEN plasmid was prepared as follows. Using a pFUS_B6 vector (Addgene) as a template, a vector prepared by In-Fusion cloning (Clontech) and a plasmid having a single DNA-binding domain were mixed, and four DNA-binding domains were ligated by a Golden Gate reaction (STEP1 plasmid) ). Thereafter, the vector prepared by In-Fusion cloning (Clontech) using the pcDNA-TAL-NC2 vector (Addgene) as a template and the above STEP1 plasmid were mixed, and the TALEN plasmid was obtained by the second-stage Golden Gate reaction. The full length sequences of the plasmids are shown in SEQ ID NOs: 1-2 (Left_TALEN) and SEQ ID NOs: 3-4 (Right_TALEN).
- TAL-PITCh vector A plasmid having a modified TALEN sequence in which the first half (first nucleotide sequence) and the second half (second nucleotide sequence) of the spacer of the tyrTALEN target sequence were exchanged was prepared (FIG. 1).
- pCS2 + Cal and pCS2 / EGFP inserted with EGFP at the Xbal site are used, and a primer set to which the above sequence is added (Xltyr-CMVEGFP-F + Xltyr-CMVEGFP-R; the sequence is shown in Table 1 below)
- Inverse PCR was performed using.
- SEQ ID NO: 98 the nucleotide sequences from the 98th to the 817th This shows the ORF sequence of EGFP, which is inserted into the Clal / Xbal site of pCS2 +, and the nucleotide sequence from 1116th to 1167th in SEQ ID NO: 5 represents the recognition sequence by the modified TALEN).
- TALEN mRNA mix (Left, Right 250 pgeach) prepared in 1-1 and 1-2 and a donor vector (100 pg) were co-introduced into a fertilized egg by a microinjection method (experimental group).
- a negative control only TALEN mRNA Right (250 pg) and a donor vector (100 pg) were co-introduced.
- Embryos were cultured at 20 ° C. and transferred to 0.1 ⁇ MMR at the blastocyst stage to advance development.
- Target integration detection Embryos (tadpole stage) co-introduced with TALEN and vector were observed under a fluorescent stereomicroscope to determine the presence or absence of GFP fluorescence. Genomic DNA was extracted from the control group and experimental group embryos for each individual, and the introduction of the donor vector into the target site was determined by PCR. Using a set of primers designed upstream and downstream of the TALEN target sequence and on the vector side, the 5 'and 3' junctions of the genome and the vector were amplified by PCR.
- a primer set of tyr-genomic-R and pCS2-F was used on the 5 ′ side and a primer set of tyr-genomic-R and pCS2-F was used on the 3 ′ side (sequence is shown in Table 1 described later).
- a band of the desired size was excised and subcloned into the pBluescript SK vector.
- the insert sequence was amplified by colony PCR and analyzed by direct sequencing. The sequence used CEQ-8000 (Beckman Coulter).
- FIG. 6A and FIG. 6B show the phenotypes of the experimental group (TALEN mix + vector-injected embryo) and negative control group (TALEN R + vector-injected embryo) in the donor vector-introduced embryo (tadpole stage).
- the experimental group since the tyr gene was destroyed, a large number of individuals exhibiting a phenotype lacking pigment (albino) in the retinal pigment epithelium and melanin-bearing cells and emitting strong GFP fluorescence throughout the body were observed (FIG. 6B).
- albino a phenotype lacking pigment
- the negative Rontrol group albino was not observed, and an individual emitting mosaic GFP fluorescence was observed in part (FIG. 6A).
- the ratio of the phenotypes of the experimental group and the negative control group is as follows: Full: GFP fluorescence is observed in the whole body, Half: left or right half is fluorescence, Mosai: mosaic fluorescence is individual, Non: GFP fluorescence Were classified into four individuals that were not observed (FIG. 7).
- In the negative control group there were no Full and Half individuals, whereas in the experimental group, about 20% of the surviving individuals showed the Full phenotype and about 50% showed the Half phenotype.
- genomic DNA was extracted and genotyped from 5 tadpoles showing the Full phenotype and 3 individuals in the negative control group observed in FIG.
- a primer set designed on the upstream and downstream of the tyrTALEN target sequence and on the vector side is used to connect the target site with the 5 'and 3' side of the donor vector.
- the experimental group No. 1, 3, 4 (5 ′ side), No. 1 Bands of the expected size were confirmed at 2, 3, 4 (3 ′ side) (FIG. 8, arrows).
- no PCR product was confirmed in the negative control group.
- NO. The 5 ′ and 3 ′ PCR products detected in 3 and 4 were subcloned, and sequence analysis was performed.
- Example 2 Target integration into HEK293T cells using CRISPR / Cas9 system
- a fluorescent protein gene expression cassette was introduced into the last coding exon of fibrillarin (FBL) gene of HEK293T cells using CRISPR / Cas9 system ( Target integration).
- FBL fibrillarin
- FIG. 10 An outline of the present embodiment is shown in FIG. Briefly, HEK293T cells were co-introduced with a vector expressing three types of gRNA and Cas9 shown in orange, red and green in FIG. 10 and a donor vector (CRIS-PITCh vector). After selection, DNA sequencing and fluorescence observation were performed.
- gRNA and Cas9 expression vectors A vector that simultaneously expresses three types of gRNA and Cas9 was designated as SCIENTIFIC REPORTS 2014 Jun 23; 4: 5400. doi: Prepared as described in 10.1038 / srep05400. Briefly, the pX330 vector (Addgene; Plasmid 42230) was modified so that multiple gRNA expression cassettes could be ligated by the Golden Gate reaction, and annealed synthetic oligonucleotides were respectively inserted into three modified pX330 vectors. Specifically, oligonucleotides 13 and 14 were annealed to produce a synthetic oligonucleotide for generation of gRNA for genome cleavage (orange in FIG.
- oligonucleotides 15 and 16 were annealed to produce a synthetic oligonucleotide for the generation of the 5 ′ cleaving gRNA (red in FIG. 10) of the donor vector.
- oligonucleotides 17 and 18 were annealed to produce a synthetic oligonucleotide for the generation of a 3 ′ cleaving gRNA (green in FIG. 10) of the donor vector.
- the vectors were integrated by Golden Gate reaction to obtain a vector that simultaneously expresses three types of gRNA and Cas9.
- CRIS-PITCh vector The CRIS-PITCh vector was prepared as follows. 5 'side gRNA target sequence, mNeonGreen coding sequence, 2A peptide coding sequence, puromycin resistance gene coding sequence, 3' side gRNA target sequence on the vector based on pCMV (Stratagene), excluding the CMV promoter A vector was constructed using In-Fusion cloning.
- FIG. 11A and FIG. 11B show the full-length sequence (SEQ ID NO: 23) of the constructed vector.
- SEQ ID NO: 23 the full-length sequence of the constructed vector.
- the coding sequence of mNeonGreen is green (nucleotides 1566 to 2273 of SEQ ID NO: 23), and the coding sequence of 2A peptide is purple (nucleotides 2274 to 2336 of SEQ ID NO: 23), puromycin
- the coding sequence of the resistance gene is shown in blue (nucleotides 2337 to 2936 of SEQ ID NO: 23), respectively.
- the underline indicates the 5 'and 3' gRNA target sequences.
- HEK293T cells Introduction into HEK293T cells was performed as follows. HEK293T cells were cultured in Dulbecco's Modified Eagle Medium (DMEM) containing 10% fetal bovine serum. The cultured cells were seeded at a cell density of 1 ⁇ 10 5 cells per well in a 6-well plate the day before the plasmid was introduced. Lipofectamine LTX (Life Technologies) was used for introduction of the plasmid, and 400 ng of gRNA and Cas9 expression vector and 200 ng of CRIS-PITCh vector were introduced.
- DMEM Dulbecco's Modified Eagle Medium
- Lipofectamine LTX (Life Technologies) was used for introduction of the plasmid, and 400 ng of gRNA and Cas9 expression vector and 200 ng of CRIS-PITCh vector were introduced.
- the cells were cultured in a drug-free medium for 3 days, and then cultured in a medium containing 1 ⁇ g / mL puromycin for 6 days. Subsequently, single cell cloning was performed on 96-well plates by limiting dilution.
- Target integration detection HEK293T cells co-introduced with a vector expressing gRNA and Cas9 and a CRIS-PITCh vector were observed using a confocal laser microscope to determine the presence or absence of fluorescence.
- genomic DNA was extracted from the puromycin-resistant cell clone, and introduction of the donor vector into the target site was confirmed.
- Primers 19 and 20 were used on the 5 ′ side and primer sets 21 and 22 were used on the 3 ′ side (sequences are shown in Table 2 below). After confirmation by agarose electrophoresis, a band of the desired size was cut out and analyzed by direct sequencing. The sequence was ABI 3130xl Genetic analyzer (Life Technologies).
- oligonucleotide sequences used in 2-1 to 2-4 above are shown in Table 2 below.
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Abstract
Description
ここで、前記細胞に含まれる核酸は、5’末端から3’末端の方向において、順に、第1のヌクレオチド配列からなる領域、前記所定の部位、および第2のヌクレオチド配列からなる領域を含み、
前記ヌクレアーゼは、前記細胞に含まれる前記の第1のヌクレオチド配列からなる領域、および前記の第2のヌクレオチド配列からなる領域からなる部分に対して特異的な切断を行うものであり、
前記ベクターは、5’末端から3’末端の方向において、順に、第1のヌクレオチド配列からなる領域、前記所望の核酸、および第2のヌクレオチド配列からなる領域を含む、
ベクター、を提供するものである。
ここで、前記細胞に含まれる核酸は、5’末端から3’末端の方向において、順に、第1のヌクレオチド配列からなる領域、前記所定の部位、および第2のヌクレオチド配列からなる領域を含み、
前記細胞に含まれる核酸において、第1のヌクレオチド配列からなる領域、前記所定の部位、および第2のヌクレオチド配列からなる領域は、それぞれ、第1のDNA結合ドメインによって認識されるヌクレオチド配列からなる領域と、第2のDNA結合ドメインによって認識されるヌクレオチド配列からなる領域との間にあり、
ここで、前記ベクターは、5’末端から3’末端の方向において、順に、第1のヌクレオチド配列からなる領域、前記所望の核酸、および第2のヌクレオチド配列からなる領域を含み、
前記ベクターにおいて、第1のヌクレオチド配列からなる領域、および第2のヌクレオチド配列からなる領域は、それぞれ、第1のDNA結合ドメインによって認識されるヌクレオチド配列からなる領域と、第2のDNA結合ドメインによって認識されるヌクレオチド配列からなる領域との間にあり、
前記ベクターは、前記ヌクレアーゼによって、5’末端から3’末端の方向において、順に、第1のヌクレオチド配列からなる領域、前記所望の核酸、および第2のヌクレオチド配列からなる領域を含む核酸断片を生じさせるものである、
ベクター、を提供するものである。
本実施例では、TALENとドナーベクター(TAL−PITChベクター)を用いて、アフリカツメガエル(Xenopus laevis)のチロシナーゼ(tyr)遺伝子のExon1に蛍光タンパク質遺伝子の発現力セットを導入(ターゲットインテグレーション)した。
TALENプラスミドは以下のように作製した。pFUS_B6ベクター(Addgene)を鋳型とし、In−Fusionクローニング(クロンテック)によって作製したベクターと、単一のDNA結合ドメインを有するプラスミドを混合し、Golden Gate反応によって4つのDNA結合ドメインを連結した(STEP1プラスミド)。その後pcDNA−TAL−NC2ベクター(Addgene)を鋳型としてIn−Fusionクローニング(クロンテック)によって作製したベクターと、前述のSTEP1プラスミドを混合し、2段階目のGolden Gate反応によってTALENプラスミドを得た。プラスミドの全長配列を配列表の配列番号1~2(Left_TALEN)、および配列番号3~4(Right_TALEN)に示す。
tyrTALEN標的配列のスペーサーの前半(第1のヌクレオチド配列)と後半(第2のヌクレオチド配列)を入れ替えた、改変TALEN配列を持つプラスミドを作製した(図1)。鋳型プラスミドにはpCS2+のClalとXbalサイトにEGFPを挿入したpCS2/EGFPを使用し、上記の配列を付加するプライマーセット(Xltyr−CMVEGFP−F+Xltyr−CMVEGFP−R;配列を後述の表1に示す)を用いてInverse PCRを行った。次に、PCR反応液にDpnl(New England Biolabs)を加え、鋳型プラスミドを消化した。精製した反応液をセルフライゲーションし、サブクローニングを行った。シーケンス解析で正確な挿入が確認されたクローンからプラスミドを調製し、ドナーベクターとした(配列を、配列表の配列番号5~6に示す。配列番号5において、98番目~817番目のヌクレオチド配列は、EGFPのORF配列を示す。これは、pCS2+のClal/Xbal siteに挿入されている。配列番号5において、1116番目~1167番目のヌクレオチド配列は、改変TALENによる認識配列を示す。)。
実験前日に、ヒト下垂体性性腺刺激ホルモン(あすか製薬)をアフリカツメガエルのオスに150unit、メスに600unit投与した。翌日、採卵した卵に精子懸濁液を数滴加え人工受精させた。約20分後に3%システイン溶液を加え、受精卵を脱ゼリーした後、0.1×MMR(両生類用リンガー液)で数回洗浄し、5%フィコール/0.3×MMRに移し替えた。上記1−1および1−2で作製したチロシナーゼTALEN mRNA mix(Left、Right 250pg each)とドナーベクター(100pg)を受精卵に微量顕微注入法によって共導入した(実験群)。ネガティブコントロールとして、TALEN mRNA Rightのみ(250pg)とドナーベクター(100pg)を共導入した。胚は20℃で培養し、胞胚期に0.1×MMRに移し替え、発生を進めた。
TALENとベクターを共導入した胚(オタマジャクシ期)を蛍光実体顕微鏡下で観察し、GFP蛍光の有無を判定した。コントロール群及び実験群の胚から個体ごとにゲノムDNAを抽出し、標的サイトへのドナーベクター導入をPCRによって判定した。TALEN標的配列の上流及び下流、ベクター側に設計したプライマーのセットを用いて、ゲノムとベクターの5’側と3’側のつなぎ目をPCRにより増幅した。5’側はtyr−genomic−FとpCS2−R、3’側はtyr−genomic−RとpCS2−Fのプライマーセットを用いた(配列は、後述の表1に示す)。アガロース電気泳動で確認の後、目的サイズのバンドを切り出して、pBluescript SK ベクターにサブクローニングした。コロニーPCRでインサート配列を増幅し、ダイレクトシークエンスにより解析した。シークエンスはCEQ−8000(ベックマン・コールター)を用いた。
ドナーベクター導入胚(オタマジャクシ期)における、実験群(TALEN mix +ベクター注入胚)及びネガティブコントロール群(TALEN R +ベクター注入胚)の表現型を図6A、および図6Bに示す。実験群ではtyr遺伝子が破壊されるため、網膜色素上皮やメラニン保有細胞において色素を欠く(アルビノ)表現型を示し、加えて全身で強いGFP蛍光を発する個体が多数観察された(図6B)。ネガティブロントロール群ではアルビノは観察されず、一部においてモザイクなGFP蛍光を発する個体が観察された(図6A)。実験群、ネガティブコントロール群の表現型の割合を、Full:GFP蛍光が全身で見られる個体、Half:左右のどちらか半分が蛍光を持つ個体、Mosaic:モザイクな蛍光を持つ個体、Non:GFP蛍光が観察されない個体の4つに分類した(図7)。ネガティブコントロール群ではFullとHalfの個体が全く見られなかったのに対し、実験群では生存した個体の約20%がFullの表現型を、約50%がHalfの表現型を示した。
次に、図6で観察した、Fullの表現型を示すオタマジャクシ5個体とネガティブコントロール群の3個体から、それぞれゲノムDNAを抽出しジェノタイピングを行った。ゲノム上の挿入箇所とベクターのつなぎ目を確認するために、tyrTALEN標的配列の上流及び下流、ベクター側に設計したプライマーのセットを用いて、標的部位とドナーベクターの5’側と3’側のつなぎ目をPCRにより増幅した(図8)。PCR産物を電気泳動したところ、実験群No.1、3、4(5’側)、No.2、3、4(3’側)において、予想サイズのバンドが確認された(図8、矢印)。一方、ネガティブコントロール群ではPCR産物は確認されなかった。次に、つなぎ目の配列を調べるために、NO.3、4で検出された、5’側及び3’側のPCR産物をサブクローニングし、シーケンス解析を行った。その結果、No.3の5’側のつなぎ目はMMEJで連結された場合に期待される配列が100%(5/5クローン)の割合で、3’側のつなぎ目は80%(4/5クローン)の割合で確認された(図9A)。No.4の5’側のつなぎ目は10塩基欠失または3塩基挿入の配列が、3’側のつなぎ目は期待される配列が100%(3/3)の割合で確認できた(図9B)。
本実施例では、CRISPR/Cas9システムを利用して、HEK293T細胞のフィブリラリン(FBL)遺伝子の最後のコーディングエクソンに蛍光タンパク質遺伝子の発現カセットを導入(ターゲットインテグレーション)した。本実施例の概要を図10に示す。簡潔に言うと、HEK293T細胞に、図10においてオレンジ色、赤色および緑色で示される3種類のgRNAおよびCas9を発現するベクターと、ドナーベクター(CRIS−PITChベクター)とを共導入し、ピューロマイシンによるセレクション後、DNAシーケンシングおよび蛍光観察を行った。
3種類のgRNAおよびCas9を同時に発現するベクターを、SCIENTIFIC REPORTS 2014 Jun 23;4:5400. doi: 10.1038/srep05400に記載されている通りに作製した。簡潔に言うと、Golden Gate反応によって複数のgRNA発現カセットを連結できるようpX330 ベクター(Addgene; Plasmid 42230)を改変し、改変型のpX330 ベクター3種類に、アニーリングした合成オリゴヌクレオチドをそれぞれ挿入した。具体的には、オリゴヌクレオチド13と14をアニーリングさせて、ゲノム切断用gRNA(図10のオレンジ色)の生成のための合成オリゴヌクレオチドを作製した。また、オリゴヌクレオチド15と16をアニーリングさせて、ドナーベクターの5’側の切断用gRNA(図10の赤色)の生成のための合成オリゴヌクレオチドを作製した。さらに、オリゴヌクレオチド17と18をアニーリングさせて、ドナーベクターの3’側の切断用gRNA(図10の緑色)の生成のための合成オリゴヌクレオチドを作製した。各プラスミドに作製した各合成オリゴヌクレオチドを挿入した後、Golden Gate反応によってベクターを統合して、3種類のgRNAおよびCas9を同時に発現するベクターを得た。
CRIS−PITChベクターは以下のように作製した。pCMV(Stratagene)をベースとするベクター上で、CMVプロモーターを除きつつ、5’側のgRNA標的配列、mNeonGreenコード配列、2Aペプチドコード配列、ピューロマイシン耐性遺伝子のコード配列、3’側のgRNA標的配列という並びになるように、In−Fusionクローニングを用いてベクターを構築した。図11Aおよび図11Bに構築したベクターの全長配列(配列番号23)を示す。図11Aおよび図11Bにおいて、mNeonGreenのコード配列は緑色(配列番号23の1566番目~2273番目のヌクレオチド)、2Aペプチドのコード配列は紫色(配列番号23の2274番目~2336番目のヌクレオチド)、ピューロマイシン耐性遺伝子のコード配列は青色(配列番号23の2337番目~2936番目のヌクレオチド)で、それぞれ示される。下線は5’側および3’側のgRNA標的配列を示す。
HEK293T細胞への導入は以下のように行った。HEK293T細胞を、ウシ胎児血清を10%含有するダルベッコ改変イーグル培地(DMEM)で培養した。培養した細胞を、プラスミドを導入する前日に6ウェルプレートへ1ウェル当たり1×105細胞の細胞密度で播種した。プラスミドの導入にはLipofectamine LTX(ライフテクノロジーズ)を用い、gRNAおよびCas9発現ベクターを400ng、CRIS−PITChベクターを200ng導入した。プラスミドの導入後、細胞を薬剤フリーの培地で3日間培養した後、1μg/mLのピューロマイシンを含む培地で6日間培養した。その後、限界希釈によって96ウェルプレート上で単一細胞クローニングを行った。
gRNAおよびCas9を発現するベクターと、CRIS−PITChベクターとを共導入したHEK293T細胞を、共焦点レーザー顕微鏡を用いて観察し、蛍光の有無を判定した。次に、ピューロマイシン耐性細胞クローンからゲノムDNAを抽出し、標的サイトへのドナーベクター導入を確認した。CRISPR標的配列の上流及び下流、ベクター側に設計したプライマーのセットを用いて、ゲノムとベクターの5’側と3’側のつなぎ目をPCRにより増幅した。5’側はプライマー19と20、3’側はプライマー21と22のプライマーセットを用いた(配列は、後述の表2に示す)。アガロース電気泳動で確認の後、目的のサイズのバンドを切り出して、ダイレクトシークエンスにより解析した。シークエンスはABI 3130xl Genetic analyzer(ライフテクノロジーズ)を用いた。
共焦点レーザー顕微鏡での観察結果を図12に示す。FBLは核小体に特異的なタンパク質であるため、FBL遺伝子への蛍光タンパク質遺伝子のターゲットインテグレーションが成功した場合、蛍光タンパク質は核小体に局在する。図12に示される通り、FBLタンパク質の局在パターン(核小体)と一致する蛍光像が得られた。次に、ゲノムと導入されたベクターの5’側と3’側のつなぎ目の配列を調べた。その結果、5’側のつなぎ目はMMEJで連結された場合に期待される配列が50%(2/4クローン)の割合で存在し、残り2クローンは9塩基の欠失または挿入を生じるものであった(図13)。3’側のつなぎ目は、完全に期待通りの配列になったものは0%(0/4クローン)であったが、1塩基の置換のみが確認されたものが1クローン存在し、その他は1塩基の欠失、5塩基の欠失、7塩基の欠失がそれぞれ1クローンずつ確認された(図13)。なお、同様に、CRISPR/Cas9システムを利用して、HCT116細胞のβ−アクチン(ACTB)遺伝子座に蛍光タンパク質遺伝子の発現カセットを導入(ターゲットインテグレーション)した場合にも、上述したHEK293T細胞におけるターゲットインテグレーションと同様の結果が得られた。
Claims (12)
- ヌクレアーゼによって、細胞に含まれる核酸における所定の部位に所望の核酸を挿入するためのベクターであって、
ここで、前記細胞に含まれる核酸は、5’末端から3’末端の方向において、順に、第1のヌクレオチド配列からなる領域、前記所定の部位、および第2のヌクレオチド配列からなる領域を含み、
前記ヌクレアーゼは、前記細胞に含まれる前記の第1のヌクレオチド配列からなる領域、および前記の第2のヌクレオチド配列からなる領域からなる部分に対して特異的な切断を行うものであり、
前記ベクターは、5’末端から3’末端の方向において、順に、第1のヌクレオチド配列からなる領域、前記所望の核酸、および第2のヌクレオチド配列からなる領域を含む、
ベクター。 - 第1のDNA結合ドメインおよび第2のDNA結合ドメインを含むヌクレアーゼによって、細胞に含まれる核酸における所定の部位に所望の核酸を挿入するためのベクターであって、
ここで、前記細胞に含まれる核酸は、5’末端から3’末端の方向において、順に、第1のヌクレオチド配列からなる領域、前記所定の部位、および第2のヌクレオチド配列からなる領域を含み、
前記細胞に含まれる核酸において、第1のヌクレオチド配列からなる領域、前記所定の部位、および第2のヌクレオチド配列からなる領域は、それぞれ、第1のDNA結合ドメインによって認識されるヌクレオチド配列からなる領域と、第2のDNA結合ドメインによって認識されるヌクレオチド配列からなる領域との間にあり、
ここで、前記ベクターは、5’末端から3’末端の方向において、順に、第1のヌクレオチド配列からなる領域、前記所望の核酸、および第2のヌクレオチド配列からなる領域を含み、
前記ベクターにおいて、第1のヌクレオチド配列からなる領域、および第2のヌクレオチド配列からなる領域は、それぞれ、第1のDNA結合ドメインによって認識されるヌクレオチド配列からなる領域と、第2のDNA結合ドメインによって認識されるヌクレオチド配列からなる領域との間にあり、
前記ベクターは、前記ヌクレアーゼによって、5’末端から3’末端の方向において、順に、第1のヌクレオチド配列からなる領域、前記所望の核酸、および第2のヌクレオチド配列からなる領域を含む核酸断片を生じさせるものである、
ベクター。 - 前記細胞に含まれる核酸における第1のヌクレオチド配列と前記ベクターにおける第1のヌクレオチド配列がマイクロホモロジー媒介性結合によって連結され、前記細胞に含まれる核酸における第2のヌクレオチド配列と前記ベクターにおける第2のヌクレオチド配列がマイクロホモロジー媒介性結合によって連結され、それによって前記所望の核酸が挿入される、請求項1または2に記載のベクター。
- 前記ヌクレアーゼがホモダイマー型のヌクレアーゼであり、前記ベクターが環状ベクターである、請求項2に記載のベクター。
- ヌクレアーゼがCas9ヌクレアーゼである、請求項1に記載のベクター。
- ヌクレアーゼがTALENである、請求項2に記載のベクター。
- 細胞に含まれる核酸における所定の部位に所望の核酸を挿入するためのキットであって、請求項1~6のいずれか1項に記載のベクター、およびヌクレアーゼを発現させるためのベクターを含む、キット。
- 細胞に含まれる核酸における所定の部位に所望の核酸を挿入する方法であって、請求項1~6のいずれか1項に記載のベクター、およびヌクレアーゼを発現させるためのベクターを、細胞に導入する工程を含む、方法。
- 請求項8に記載の方法によって取得された細胞。
- 請求項9に記載の細胞を含む生物。
- 請求項8に記載の方法によって取得された細胞を分化させる工程を含む、所望の核酸を含む生物の製造方法。
- 請求項11に記載の方法によって製造された生物。
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US20160264995A1 (en) | 2016-09-15 |
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US20190177745A1 (en) | 2019-06-13 |
CN105683375B (zh) | 2021-02-02 |
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