WO2023038020A1 - 核酸配列改変用組成物および核酸配列の標的部位を改変する方法 - Google Patents
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Definitions
- compositions for modifying nucleic acid sequences relate to compositions for modifying nucleic acid sequences and methods for modifying target sites of nucleic acid sequences.
- a zinc finger nuclease which is a combination of a zinc finger DNA binding domain (zinc finger array) and a non-specific DNA cleavage domain (nuclease domain)
- ZFN zinc finger nuclease
- the host plant A method of recombination at a target gene locus in DNA in cells or insect cells (see Patent Document 1, FIG.
- Transcription activator-like (TAL) effector which is a DNA-binding module possessed by plant pathogens Xanthomonas genus and a DNA endonuclease (nuclease domain) are used to cleave and modify a target gene at a site within or adjacent to a specific nucleotide sequence
- TAL Transcription activator-like effector
- Patent Document 1 requires two domains (zinc finger arrays) that recognize genomic DNA, each of which is formed of protein.
- Each of the two domains that recognize genomic DNA is designed to recognize the 3' side from the target site of double-stranded DNA. Therefore, when modifying the target site of genomic DNA, there is a problem that it is necessary to design a pair of zinc finger arrays with different sequences.
- the method described in Patent Document 2 has the advantage that the direction of the domain (TAL effector) that recognizes genomic DNA is 5' from the target site of the double-stranded DNA. It is different from the method described in 1.
- the method described in Patent Document 1 there is the problem that it is necessary to design a pair of TAL effectors with different sequences when modifying the target site of genomic DNA.
- CRISPR/Cas9 has attracted attention as a technique for modifying the target site of genomic DNA (see Patent Documents 3 to 6).
- CRISPR/Cas9 as shown in Figure 2, is composed of a guide RNA having a sequence complementary to the DNA to be modified and a Cas9 protein that forms a complex with the guide RNA.
- CRISPR/Cas9 guide RNA should form a complementary pair by recognizing only one strand of the double-stranded DNA. Therefore, unlike Patent Documents 1 and 2, there is an advantage that only one guide RNA is required to guide the nuclease domain that modifies the target site of the genomic DNA.
- the method using CRISPR / Cas9 described in Patent Documents 3 to 6 is, as shown in FIG. is cleaved by the Cas9 endonuclease.
- the method using CRISPR/Cas9 has the problem that the target site of genomic DNA is restricted to the vicinity of the PAM sequence. It is also known to modify RNA by using Cas13, but even in that case, there is a problem that the target site is restricted to the vicinity of the PFS (Protospacer Flanking Site) sequence.
- PFS Protospacer Flanking Site
- the disclosure in the present application was made to solve the above problems, and as a result of intensive research, (1) an RNA containing a hybridizing region and a recognition region, and (2) a complex formed with the recognition region It was newly found that the nucleic acid sequence can be modified without depending on the PAM sequence and the PFS sequence by using a fusion protein that Thus, it is an object of the disclosure in this application to provide compositions for modifying nucleic acid sequences and methods for modifying target sites in nucleic acid sequences that are independent of PAM and PFS sequences.
- a composition for modifying a nucleic acid sequence comprising RNA and a fusion protein
- RNA is a hybridizing region capable of hybridizing to a sequence 5′ or 3′ to the target site of the nucleic acid sequence
- a guide region that guides the fusion protein including the guide region comprises a recognition region that forms a complex with the fusion protein
- the fusion protein is a binding domain that recognizes the RNA recognition region and forms a complex with the recognition region (except that the binding domain contains the RNA recognition region of the Cas protein group); a modification domain that modifies a target site of a nucleic acid sequence
- a composition for modifying a nucleic acid sequence comprising: (2) The composition for modifying a nucleic acid sequence according to (1) above, wherein the fusion protein comprises a linker sequence connecting the binding domain and the modification domain.
- the binding domain comprises the RNA binding region of Nova;
- a composition for modifying a nucleic acid sequence comprising: (9) RNA for forming the composition for modifying a nucleic acid sequence according to any one of (1) to (7) above. (10) A nucleic acid that serves as a template for transcription of RNA for forming the composition for modifying a nucleic acid sequence according to (8) above. (11) A fusion protein for forming the composition for modifying a nucleic acid sequence according to any one of (1) to (7) above.
- a method of modifying a target site in a nucleic acid sequence comprising: an introduction step of introducing the composition for modifying a nucleic acid sequence according to any one of (1) to (8) above into a cell; a modification step in which the modification domain modifies a target site of the nucleic acid sequence; A method of modifying a target site in a nucleic acid sequence.
- the nucleic acid according to (13) above which includes, prior to the introducing step, a step of identifying a hybridizing region capable of hybridizing to a sequence on the 5' side or 3' side of the target site of the nucleic acid sequence.
- a method for modifying the target site of a sequence (15) one hybridizing region is required to modify one target site; A method for modifying the target site of the nucleic acid sequence according to (13) or (14) above.
- a guide region designing step of designing at least the number of recognition regions and RNA sequences so that a complex can be formed with the number of fusion proteins required for modification of the nucleic acid sequence Before the introduction step, a guide region designing step of designing at least the number of recognition regions and RNA sequences so that a complex can be formed with the number of fusion proteins required for modification of the nucleic acid sequence.
- composition for modifying a nucleic acid sequence and the method for modifying a target site of a nucleic acid sequence disclosed in the present application can modify a nucleic acid sequence independently of the PAM and PFS sequences.
- FIG. 1A is a schematic diagram showing an outline of a genome editing method using zinc finger nuclease.
- FIG. 1B is a schematic diagram showing an outline of a genome editing method using TALENs.
- Figure 2 is a schematic diagram showing an overview of the genome editing method using CRISPR / Cas9.
- 3A and 3B are schematic diagrams showing an outline of Modification Composition 1.
- FIG. 4A and 4B are schematic diagrams outlining variations of the modifying composition 1.
- FIG. FIG. 5 is a diagram showing an outline of the second embodiment.
- FIG. 6 is a drawing substitute photograph, which is an electrophoresis photograph of Example 2.
- FIG. FIG. 7 is a photograph substituting for a drawing, which is an electrophoresis photograph for confirming the band indicated by the arrow in lane 3 of Example 2.
- composition for modification a composition for modifying a nucleic acid sequence
- method for modification a method for modifying a target site of a nucleic acid sequence
- FIGS. 3 and 4 are schematic diagrams showing an outline of Modification Composition 1.
- FIG. 4A and 4B are schematic diagrams outlining variations of the modifying composition 1.
- FIG. 3 the description common to FIGS. 3A and 3B may be simply referred to as "FIG. 3".
- the modification composition 1 contains RNA2 and fusion protein 3.
- the RNA 2 guides the hybridizing region 21 that can hybridize to the genomic DNA 4 on the 5′ side of the target site (modification site) 41 of the genomic DNA 4 having a double helix structure, and the fusion protein 3.
- a guide region 22 is included.
- the hybridizing region 21 hybridizes to the genomic DNA 4 on the 5′ side of the target site 41 .
- the hybridizing region 21 may be formed so as to hybridize to the genomic DNA 4 on the 3′ side of the target site 41 .
- the guide region 22 is arranged adjacent to the hybridization region 21 .
- Guide region 22 also includes recognition region 23 that forms a complex with fusion protein 3 by recognizing binding domain 31 of fusion protein 3 .
- 3 and 4 show an example in which the target to be modified by the modification composition 1 is the genomic DNA 4.
- the modifying composition 1 may modify the nucleic acid sequence RNA.
- RNA4 an example in which the target to be modified by the modifying composition 1 is the genomic DNA 4 will be described. The same is true for RNA4.
- "genomic DNA 4" should be replaced with "RNA 4".
- the fusion protein 3 contains a binding domain 31 that forms a complex with the recognition region 23 of RNA2, and a modification domain 32 that modifies the target site 41 of genomic DNA4.
- the length of the hybridizing region 21 is not particularly limited as long as it is a length that allows positioning of RNA2 on the 5' side or 3' side of the target site 41 of the genomic DNA 4. If the hybridizing region 21 is short, there is a risk of off-targeting. Therefore, the length should be appropriately set while considering the risk of off-target. Although not limited, for example, it may be 15 bp or more, 20 bp or more, 25 bp or more, 30 bp or more, 35 bp or more, 40 bp or more, or 45 bp or more. On the other hand, from the viewpoint of the positioning of RNA2, the length of the hybridizing region 21 is not particularly limited, but the longer the hybridizing region 21, the higher the production cost of RNA2.
- the length of the guide region 22 may be appropriately adjusted in consideration of the size of the fusion protein 3, the distance from the end of the hybridization region 21 to the target site 41, and the like.
- Guide region 22 may also include a stem loop.
- guide region 22 includes two recognition regions 23 to modify target site 41 with a pair of fusion proteins 3 (more specifically, a pair of modification domains 32). If the guide region 22 includes stem loops, the two recognition regions 23 can be placed close to each other sterically.
- two stem loops may be formed such that the recognition region 23 is located in the loop portion. The number of stem loops and the portion where the recognition region 23 is arranged are merely examples.
- the number of stem loops may be one, three, or four as long as the pair of modification domains 32 are arranged in a positional relationship that allows modification of the target site 41 .
- the recognition region 23 may be arranged on the stem, or may be arranged so as to straddle the stem and the loop.
- the length between the recognition regions 23 (the length of a portion of the guide region 22) may also be appropriately adjusted while considering the size of the fusion protein 3 and the like.
- the RNA sequence of the recognition region 23 should be determined based on the type of the fusion protein 3 so that it can form a complex with the binding domain 31 of the fusion protein 3. A combination of the RNA sequence of the recognition region 23 and the binding domain 31 will be described later.
- FIG. 3A shows an example in which the target site 41 is modified by arranging the modification domain 32 of the pair of fusion proteins 3 at the target site 41 of the genomic DNA 4 . Therefore, the guide area 22 includes two recognition areas 23 .
- a pair of modifying compositions 1 are used to hybridize a pair of hybridizing regions 21 to genomic DNA 4 such that the modifying domain 32 faces the target site 41. good too. Since it is necessary to design two hybridization regions 21, the cost is increased, but it is technically possible.
- one recognition region 23 may be included in the guide region 22 as shown in FIG. 3B.
- the guide region 22 may include a stem loop. Further, the recognition region 23 may be arranged in the loop portion, may be arranged in the stem portion, or may be arranged so as to straddle the stem and the loop. Note that FIGS. 3A and 3B show examples in which the recognition area 23 is part of the guide area 22 . Alternatively, the length of recognition area 23 may match the length of guide area 22 . In this specification, the guide region 22 includes the recognition region 23 when the recognition region 23 is part of the guide region 22, and when the length of the recognition region 23 matches the length of the guide region 22, is meant to include any of
- Fusion protein 3 includes (1) a binding domain 31 that recognizes a specific sequence (recognition region 23) contained in guide region 22 of RNA 2 and forms a complex with recognition region 23, and (2) a target site of genomic DNA 4.
- the modified domain 32 that modifies 41 is included.
- the term "fusion protein” refers to a protein that is artificially synthesized to contain the binding domain 31 and the modified domain 32 as described above, and does not exist in nature.
- a protein that can form a complex with the recognition region 23 and a protein that modifies the genomic DNA 4 may be fused.
- fusion protein 3 is produced using a known protein, it is not necessary to include the entire amino acid sequence of the known protein.
- RNA2 For example, in the case of a protein that binds to the recognition region 23 of RNA2, only the region that binds to the recognition region 23 may be used. Moreover, in the case of a protein that modifies the genomic DNA 4, only the region having the function of modifying the genomic DNA 4 may be used.
- Fusion protein 3 may be produced by a known method.
- a nucleic acid sequence may be designed based on the amino acid sequence of the designed fusion protein 3 and synthesized using a cell-free protein synthesis system.
- a nucleic acid sequence including a promoter and the like may be designed, the designed nucleic acid sequence may be introduced into a plasmid, and the fusion protein 3 may be synthesized using cells.
- the fusion protein 3 is not particularly limited as long as it includes the binding domain 31 and the modification domain 32, and any sequence may be added as necessary.
- a linker sequence for connecting the binding domain 31 and the modification domain 32, and a nuclear localization sequence (nuclear localization signal/sequence: NLS) as a marker for transporting the fusion protein 3 to the nucleus of the cell are added.
- NLS nuclear localization sequence
- a known sequence may be used for the NLS.
- modified domain 32 may be arranged on the downstream side. Further, when the fusion protein 3 is formed in the order of the modified domain 32 ⁇ binding domain 31 from the upstream side, the NLS is located upstream of the modified domain 32, between the modified domain 32 and the binding domain 31, and downstream of the binding domain 31. should be placed.
- altering the target site 41 of the nucleic acid sequence means that the target site 41 of the double-stranded DNA 4 or single-stranded (double-stranded) RNA 4 to a state that is physically and/or functionally different from its original state. In other words, it means that the modification domain 32 has the function of making the nucleic acid sequence into the "different state”.
- the modification domain 32 that makes the target site 41 of the genomic DNA 4 functionally different is not limited, but includes, for example, those having the following functions. (6) transcription activator (7) transcription repressor
- modified domains 32 More specific examples of the modified domains 32 described in (1) to (7) above are shown below. Enzymes described in patent documents and non-patent documents may be used as the modification domain 32 as they are. Alternatively, a partial region may be deleted or added as long as the described enzyme functions to modify the genomic DNA 4 .
- the RuvC-like domain has lost nuclease activity, so the D10A mutant acts as a nickase, producing single-stranded DNA breaks (nicks) rather than double-stranded DNA breaks.
- double-nicking method two sgRNAs and a Cas9 nickase act against a target sequence in double-stranded DNA to guide each strand.
- HNH nuclease domain H840A point mutation see the literature described in (2-1) above. It is also available from Waken Pharmaceutical Co., Ltd.
- the enzyme described in (2-1) above cleaves only target strands of DNA, whereas the enzyme described in (2-2) cleaves non-target strands.
- transposase domain integrase domain, recombinase domain, resolvase domain, invertase domain, protease domain, DNA methyl transferase domain, DNA hydroxymethylase domain, DNA demethylase domain, histone acetylase domain, histone deacetylase domain, nuclease domain, repressor domain, activator domain, nuclear localization signal domain, transcription-regulatory protein (or transcription complex body recruitment) domains, cell uptake activity-related domains, nucleic acid binding domains, antibody presenting domains, histone modifying enzymes, recruiters of histone modifying enzymes; inhibitors of histone modifying enzymes, histone methyltransferases, histone demethylases, histone kinases, histone phosphatases, histone ribosylase, histone deribosylase, histone ubiquitinase, histone de
- enzymes capable of forming modification domains 32 include, for example, the following types.
- modified domain 32 that makes the target site 41 of RNA 4 functionally different is not limited, but for example, Adenosine Deaminase Acting on RNA (ADAR), which is a double-stranded RNA-specific adenosine deaminase ( Marina et al., "Evaluation of Engineered CRISPR-Cas-Mediated Systems for Site-Specific RNA Editing", Cell Reports 33, 108350, November 3, 2020).
- ADAR Adenosine Deaminase Acting on RNA
- the sequences of the binding domain 31 and the recognition region 23 are not particularly limited as long as they are combinations of protein and RNA sequences that can recognize the recognition region 23 of RNA2 and form a complex with the recognition region 23 . Therefore, when the guide region 22 includes two or more recognition regions 23, it may include the recognition regions 23 having the same RNA sequence for the same binding domain 31, or may include the recognition regions 23 having different RNA sequences. . For the same reason, when the guide region 22 contains two or more recognition regions 23, the same binding domain 31 may form a complex with the same RNA sequence (recognition region 23), or different binding domains 31 may form a complex.
- the sequences of the binding domain 31 and the recognition region 23 are not limited, but include, for example, the following combinations.
- Nova: 5'-UCAY-3' K. Jensen et al., "The tetranucleotide UCAY directs the specific recognition of RNA by the Nova K-homology 3 domain", PNAS, 2000, 97 (11), 57 -5745.
- this paper may be referred to as “Non-Patent Document 1”.
- the 5'-UCAY-3' is formed in the loop portion of the stem loop.
- FIG. 6 see Table 1 below).
- TLS 5'-GGUG-3' (Wang et al., "Induced ncRNAs allosterically modify RNA-binding proteins in cis to inhibit transcription", Nature, Vol 454, 3, July 2008)
- the proteins that bind to RNA include the following proteins. Since it is known to bind to RNA, the RNA sequence may be appropriately designed. (4)RNG105(N. Shiinaet et al.,“A Novel RNA-Binding Protein in Neuronal RNA Granules:Regulatory Machinery for Local Translation”,The Journal of Neuroscience,April 27,2005 ⁇ 25(17):4420-4434)
- the Cas protein group Cas9 and the like recognize the PAM sequence of genomic DNA4. It is also known that PAM sequences differ according to the bacterial species from which the nuclease is derived and the type/subtype of the nuclease (see Table 2 below). Furthermore, the Cas protein family, Cas13, is known to recognize PFS sequences in RNA. Therefore, the binding domain 31 disclosed in the present application is excluded from including a protein that recognizes and binds to the PAM sequence and the PFS sequence, and a region of the protein that recognizes the PAM sequence or the PFS sequence. Alternatively, it may be said that the binding domain 31 excludes the RNA recognition region of the Cas protein group.
- the Cas protein group includes, for example, Cas9, Cpf1, Cas3, Cas8a-c, Cas10, Cse1, Csy1, Csn2, Cas4, Csm2, or Cm5.
- the region that modifies the nucleic acid sequence may be included as the modification domain 32 .
- RNA2 includes a hybridization region 21 that hybridizes with genomic DNA4 or RNA4 and a guide region 22 .
- Guide region 22 includes one or more recognition regions 23 that form a complex with fusion protein 3 . Therefore, as shown in FIGS. 3A and 3B, there may be only one hybridizing region 21 regardless of whether the modification domain 32 has the modification function of a monomer or a dimer (or more). Therefore, the design of the hybridization region 21 is facilitated.
- CRISPR / Cas9 described in Patent Documents 3 to 6 the target site 41 of genomic DNA 4 is restricted near the PAM sequence. Also in the case of Cas13, target site 41 of RNA4 is restricted to the vicinity of the PFS sequence.
- the modification composition 1 according to the first embodiment can determine the target site 41 without being restricted by the sequence of the genomic DNA 4 or RNA 4 .
- the number of recognition areas 23 included in the guide area 22 can be arbitrarily designed. Therefore, since the guide region 22 can be designed according to the type of the fusion protein 3, the degree of freedom in designing the guide region 22 is improved.
- the fusion protein 3 can be formed by selecting and fusing the region that functions as the binding domain 31 and the region that functions as the modification domain 32, unlike the natural protein (and partially modified protein). Therefore, the size of fusion protein 3 can be reduced compared to conventional natural proteins (and partially modified proteins). Furthermore, the degree of freedom in designing the fusion protein 3 is improved.
- Modification 1 of composition for modifying nucleic acid sequence Modified Example 1 of the modifying composition 1 according to the embodiment will be described with reference to FIGS. 4A and 4B.
- the hybridizing region 21 and the guide region 22 of RNA2 are directly connected.
- RNA2 contains a first complementary region 24 connected to one end of the hybridizing region 21 .
- the hybridization region 21 and the guide region 22 are indirectly connected.
- the modification composition 1 since the hybridization region 21 and the guide region 22 are directly connected, it is necessary to integrally form the RNA2.
- Modification 1 only the hybridizing region 21 and the first complementary region 24 need to be designed according to the target site 41 . Therefore, cost reduction can be achieved by mass-producing the guide region 22 and the fusion protein 3 .
- the operator who provides the modification composition 1 can provide only the guide region 22 and the fusion protein 3, and the user can design and synthesize the hybridization region 21 and the first complementary region 24. Experiments can also be undertaken.
- the composition for modification 1 is formed by the RNA 2 and the fusion protein 3 .
- a nucleic acid that serves as a template for transcription of RNA2 hereinafter sometimes referred to as "RNA2 template”
- template for fusion protein 3 a nucleic acid that serves as a template for translating fusion protein 3
- the template for RNA2 and the template for fusion protein 3 can be DNA or RNA.
- the template for RNA2 should at least contain a sequence for transcription of RNA2.
- the template for fusion protein 3 may contain at least a sequence for translating fusion protein 3 .
- the template for RNA2 and the template for fusion protein 3 may contain a promoter and an untranslated region for promoting translation, if necessary.
- RNA2 and the template for fusion protein 3 are DNA
- a promoter for RNA transcription is ligated upstream of the template for RNA2
- a promoter for protein translation is ligated upstream of the template for fusion protein 3. do.
- RNA2 template and the fusion protein 3 template are introducing the RNA2 template and the fusion protein 3 template into cells, (1) RNA2 is transcribed from the RNA2 template, (2) mRNA is transcribed from the fusion protein 3 template, and transcription is performed. Fusion protein 3 is translated from the resulting mRNA, and (3) modification composition 1 is formed in the cell.
- the template for RNA2 and the template for fusion protein 3 are DNA, they may be inserted into the same plasmid vector together with the promoter, or may be inserted into different plasmid vectors.
- the template for RNA2 and the template for fusion protein 3 may be inserted into a DNA-type virus such as adeno-associated virus (AAV) together with a promoter.
- AAV adeno-associated virus
- RNA virus such as a lentivirus
- DNA is first reverse transcribed from the RNA2 template and the fusion protein 3 template inserted into the RNA virus introduced into the cell. Then, RNA2 is transcribed from the reverse-transcribed DNA, mRNA is transcribed from the reverse-transcribed DNA, and fusion protein 3 is translated from the mRNA.
- the template for fusion protein 3 may be mRNA. If the template for fusion protein 3 is mRNA, it is not necessary to ligate a promoter to the mRNA. By introducing the mRNA into the cell, the fusion protein 3 can be directly translated from the mRNA within the cell.
- RNA2 and fusion protein 3 differs depending on the type of template nucleic acid.
- the nucleic acid serving as a template for transcription of RNA includes not only a template that directly transcribes RNA2 (template DNA), but also a template that indirectly transcribes RNA2 (template RNA) is also a concept.
- the template nucleic acid is a template (mRNA) that directly translates the fusion protein 3, and also indirectly translates the fusion protein 3.
- the concept also includes a template (template DNA, template RNA).
- the template for RNA 2 and the template for fusion protein 3 are used for the type (template DNA, template RNA, mNRA) and form (insertion into vector or virus) when the composition for modification 1 is finally formed in the cell. presence or absence) may be the same or different.
- Promoters for RNA transcription, promoters for protein translation, plasmids, DNA-type viruses, and RNA-type viruses are not particularly limited as long as they have the above functions, and known ones may be used.
- promoters for RNA transcription include, but are not limited to, U6 promoter.
- Promoters for protein translation include CMV Promoter and the like. Plasmids include pcDNA3.1 for mammals; pBluescript II KS and pET series for bacteria; pPIC series for yeast;
- DNA-type viruses include the adeno-associated virus (AAV) described above.
- RNA-type viruses include the above lentiviruses and the like.
- the modifying composition 1 according to Modified Example 2 may be rephrased as a composition for forming a modifying composition.
- Modification 3 of composition for modifying nucleic acid sequence Next, Modified Example 3 of the modifying composition 1 according to the embodiment will be described.
- the composition for modification 1 is formed by combining the RNA 2 and the fusion protein 3 .
- the composition for modification 1 is formed by combining the RNA2 template and the fusion protein 3 template.
- Variation 3 only one of the combination elements forming Modification Composition 1 is provided, and the separately provided elements are combined in use to form Modification Composition 1. You may
- RNA2 and fusion protein 3 have already been described in modification composition 1 and modification 1 according to the embodiment, and the template for RNA2 and the template for fusion protein 3 have already been described in modification 2. Therefore, specific descriptions will be omitted to avoid duplicate descriptions.
- the modification method comprises an introduction step of introducing the modification composition 1 described in the modification composition embodiment and modifications into cells, a modification step of modifying the target site 41 of the nucleic acid sequence 4 with the modification domain 32, and a modification step. including.
- the cell is not particularly limited as long as it contains the nucleic acid sequence 4.
- examples include human or non-human animal cells; plant cells; insect cells; microbial cells such as E. coli, yeast, and fungi;
- the cells may be single cells, or aggregates of cells (spheroids).
- the term "cell” includes both concepts of a single cell and aggregates of multiple cells.
- the introduction step is not particularly limited as long as the composition for modification 1 can be introduced into cells, and a known method such as electroporation may be used. Moreover, when a DNA virus or an RNA virus is used as the modification composition according to Modification 2, cells may be infected by a known method. In addition, when the composition for modification 1 according to modification 2 is used, a step of forming RNA 2 and fusion protein 3 in the cell is included after the introduction step.
- the hybridizing region 21 of the modification composition 1 introduced into the cell hybridizes to the nucleic acid sequence 4, and the modification domain 32 modifies the target site 41 of the nucleic acid sequence 4.
- one or two hybridization regions 21 may be required to modify one target site 41 .
- the modifying composition 1 disclosed in the present application can contain two or more recognition regions 23 in one guide region 22 . Therefore, the recognition region 23 can be designed so that even one hybridizing region 21 necessary for modifying one target site 41 can form a complex with the number of fusion proteins 3 necessary for modifying the nucleic acid sequence 4. . If only one hybridization region 21 is required to modify one target site 41, manufacturing costs can be reduced and the convenience of experiments can be improved.
- the modification method may include, prior to the introduction step, a step of identifying a hybridizing region 21 that can hybridize to the sequence on the 5' side or 3' side of the target site 41 of the nucleic acid sequence 4.
- the entire RNA2 may be produced including the hybridizing region 21 specified in the step of specifying the hybridizing region.
- the user may prepare the hybridizing region 21 and the first complementary region 24 and combine them with the separately provided guide region 22 and fusion protein 3 to prepare the modification composition 1 and carry out the modification method. good.
- the modification method includes a guide region designing step of designing at least the number of recognition regions 23 and RNA sequences so that complexes can be formed with the number of fusion proteins 3 required for modification of the nucleic acid sequence 4 before the introduction step. It's okay.
- the guide region designing step may include designing a linker sequence that connects two or more recognition regions 23, if necessary. It is not known that one guide region 22 forms a complex with two or more fusion proteins 3 and that modification domains 32 contained in the fusion proteins 3 modify the nucleic acid sequence 4 . Therefore, the guide area design process is a new process.
- DNA has a self-repair function. Therefore, when the nucleic acid sequence 4 is genomic DNA, a step of introducing DNA into the target site 41 may be carried out after carrying out the modification step, if necessary.
- the modification domain 32 is an enzyme that cleaves the genomic DNA 4, such as FokI
- the modification step cleaves the target site 41 of the genomic DNA 4 and modifies it into a physically different state.
- genomic DNA4 may lose its function (knockout).
- the genomic DNA 4 after cutting may repair the cut site due to its self-repair function.
- ssODN ssDNA
- dsDNA dsDNA
- a desired DNA fragment can be inserted into the cleavage site when repairing target site 41 of genomic DNA 4 cleaved in the modification step.
- a desired function can be added to genomic DNA4 by inserting a desired DNA fragment (knock-in).
- a modification composition 1 was prepared by the following procedure. (1) Production of fusion protein (FokI-Nova) As fusion protein 3, FokI-Nova was produced. The amino acid sequence of FokI-Nova is shown in SEQ. ID. 1 (SEQ ID NO: 1). SEQ. ID.
- the underlined part (“Q” in the 7th column from the right of the 1st row to “F” in the 11th column from the left of the 5th row) indicates the cleavage region of FokI (modified domain 32)
- the double underlined part (“K” in the 28th column from the left of the 5th row to "G” in the 8th column from the right of the 6th row) indicates the RNA binding region (binding domain 31) of NOVA
- the bold underlined part (the right of the 6th row) "P" on the 3rd column to "V” on the 4th column from the left of the 7th row) indicates the NLS.
- Others are linker sequences and the like.
- the supernatant was recovered as a soluble fraction by centrifugation. 1 ml of resin was placed in the column and allowed to settle. After draining the stock solution, 10 bed volumes of equilibration buffer was added to equilibrate the resin. The soluble fraction was applied to the column and allowed to bind the His-Tag fusion protein. The column was washed with 8 bed volumes of equilibration buffer. The column was washed with 7 bed volumes of equilibration buffer (containing 10 mM Imidazole). The His-Tag fusion protein was eluted with an elution buffer of 3bed volumes. An equal amount of the purified protein was mixed with EzApply (ATTO) and subjected to heat treatment at 95° C.
- EzApply ATTO
- ⁇ Reagent> ⁇ Protein extraction reagent: BugBuster Protein Extraction Reagent (Novagen) ⁇ Purified resin: TALON Metal Affinity Resin (Takara Bio) - Equilibration buffer: 50 mM sodium phosphate, 300 mM sodium chloride; pH 7.4 - Elution buffer: 50 mM sodium phosphate, 300 mM sodium chloride, 150 mM imidazole; pH 7.4 - Electrophoresis buffer: 25 mM Tris pH 8.3, 192 mM Glycine, 0.1% SDS
- RNA2 was produced by the following procedures.
- the pCR2.1 vector was ligated with XbaI and SpeI by a conventional method.
- SEQ. ID. The underlined portions of 4 and 5 are the sequences (both ends of the hybridizing region 21) forming a complementary pair with the DNA sequence 4 encoding GFP shown in FIG. Note that in FIG. 5, due to space limitations, the "ID.” of the sequence number is omitted.
- (b) guide area 22 UCAY5P (5′-TCGGATCCGCAGTCTCATCATCATTTCATTTGTGTTCGTTAGCACATTGGGCAGTCTCAT-3′: SEQ.ID.6) and UCAY3P (5′-GAAGATCTCAAATGAAAATGATGATGAGACTGCCCAATGTGCTAACGAACAAAATGAAA-3′:SEQ.ID.7) were annealed and annealed.
- the template annealed at the BamHI site was treated with restriction enzymes with BamHI and BglII, and ligation was performed on the downstream side of (a) above by a conventional method.
- RNA2 (c) Synthesis of RNA2
- the pCR2.1 vector was subjected to restriction enzyme treatment with HindIII, and RNA was synthesized using the in vitro Transcription T7 Kit.
- RNA2 is shown in FIG. 6 ⁇ 2-glyR (GCAGUCUCAUCAUCAUUUUCAUUUUG: SEQ.ID.8) via a linker.
- FIG. 5 is a diagram showing an outline of the second embodiment.
- the GFP PCR product shown in 9 was obtained.
- - Fw primer (5'-GTGAGCAAGGGCGAGGAGCTG-3': SEQ.ID.10)
- Rv primer 5'-CTTGTACAGCTCGTCCATGCCG-3': SEQ.ID.11
- hybridizing region 21 was designed to be cleaved near the center of the GFP-encoding sequence (714 bp), as shown in FIG. Therefore, an experiment was performed to confirm that the DNA fragment indicated by the arrow in lane 3 of FIG. 6 contains both the upstream and downstream sides of the sequence encoding GFP.
- band extract The band indicated by the arrow in lane 3 of FIG. 6 was gel-extracted using Qiagen's QIAquick Gel Extraction Kit (hereinafter referred to as "band extract").
- An outline of the confirmation experiment will be described with reference to FIG. (1) Amplification of band extract 1: SEQ. ID. 10, SEQ. ID. 12 was used to amplify band extracts. The length of the amplified product is 221 bp. 2: SEQ. ID. 13, SEQ. ID. 11 was used to amplify band extracts. The length of the amplified product is 251 bp. (2) SEQ. ID. Amplification of GFP fragment using 3 as template 3: SEQ. ID. 10, SEQ. ID.
- SEQ. ID. 12 was used to amplify the sequence encoding the GFP fragment.
- the length of the amplified product is 221 bp. 4: SEQ. ID. 13
- SEQ. ID. 11 was used to amplify the sequence encoding the GFP fragment.
- the length of the amplified product is 251 bp.
- SEQ. ID. The sequences of 12 and 13 are as follows. ⁇ SEQ. ID. 12:5'-TAGCGGCTGAAGCACTGCAC-3' ⁇ SEQ. ID. 13:5′-ACAAGCAGAAGAACGGCATCAAG-3′
- Electrophoresis was performed on the above amplification products.
- the results are shown in FIG. M in FIG. 7 corresponds to the 100 bp Marker, and lanes 1 to 4 in FIG. 7 correspond to the amplification products described in 1 to 4 above. From the results shown in lanes 1 and 2 of FIG. 7, it was confirmed that the band extract cleaved with fusion protein 3 contained the upstream and downstream sides of the sequence encoding the GFP fragment. From the above results, it was confirmed that the modification composition disclosed in the present application can be used to modify a nucleic acid sequence without depending on the PAM sequence and the PFS sequence.
- the nucleic acid sequence can be modified without depending on the PAM sequence and the PFS sequence. Therefore, it is useful for industries requiring genome editing, such as the pharmaceutical industry and research institutes.
- SYMBOLS 1 Composition for modifying genomic DNA, 2... RNA, 21... Hybridization region, 22... Guide region, 23... Recognition region, 24... First complementary region, 3... Fusion protein, 31... Binding domain, 32... Modification domain , 4... nucleic acid sequence, genomic DNA, RNA, 41... target site
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Abstract
Description
RNAは、
核酸配列の標的部位の5’側または3’側の配列にハイブリダイズし得るハイブリダイズ領域と、
融合タンパク質をガイドするガイド領域と、
を含み、
ガイド領域は、融合タンパク質と複合体を形成する認識領域を含み、
融合タンパク質は、
前記RNAの認識領域を認識し、認識領域と複合体を形成する結合ドメインと(但し、結合ドメインがCasタンパク質群のRNA認識領域を含むことを除く。)、
核酸配列の標的部位を改変する改変ドメインと、
を含む
核酸配列改変用組成物。
(2)融合タンパク質は、結合ドメインおよび改変ドメインを連結するリンカー配列を含む
上記(1)に記載の核酸配列改変用組成物。
(3)ガイド領域が、認識領域を2つ含む
上記(1)または(2)に記載の核酸配列改変用組成物。
(4)ハイブリダイズ領域の一端部に接続した第1相補領域を含み、
第1相補領域がガイド領域の一端部側と相補対を形成することで、ハイブリダイズ領域およびガイド領域が間接的に接続する
上記(1)~(3)の何れか一つに記載の核酸配列改変用組成物。
(5)ガイド領域が、ステムループを含む
上記(1)~(4)の何れか一つに記載の核酸配列改変用組成物。
(6)結合ドメインが、NovaのRNA結合領域を含み、
改変ドメインが、ゲノムDNAを切断するFokIの開裂領域を含む
上記(1)~(5)の何れか一つに記載の核酸配列改変用組成物。
(7)核酸配列が、ゲノムDNAである
上記(1)~(6)の何れか一つに記載の核酸配列改変用組成物。
(8)上記(1)~(7)の何れか一つに記載のRNAを転写するための鋳型となる核酸、および、
上記(1)~(7)の何れか一つに記載の融合タンパク質を翻訳するための鋳型となる核酸、
を含む
核酸配列改変用組成物。
(9)上記(1)~(7)の何れか一つに記載の核酸配列改変用組成物を形成するための、RNA。
(10)上記(8)に記載の核酸配列改変用組成物を形成するための、RNAを転写するための鋳型となる核酸。
(11)上記(1)~(7)の何れか一つに記載の核酸配列改変用組成物を形成するための、融合タンパク質。
(12)上記(8)に記載の核酸配列改変用組成物を形成するための、融合タンパク質を翻訳するための鋳型となる核酸。
(13)核酸配列の標的部位を改変する方法であって、該方法は、
上記(1)~(8)の何れか一項に記載の核酸配列改変用組成物を細胞に導入する導入工程と、
改変ドメインが核酸配列の標的部位を改変する改変工程と、
を含む
核酸配列の標的部位を改変する方法。
(14)導入工程の前に、核酸配列の標的部位の5’側または3’側の配列にハイブリダイズし得るハイブリダイズ領域を特定するハイブリダイズ領域特定工程を含む
上記(13)に記載の核酸配列の標的部位を改変する方法。
(15)一つの標的部位を改変するために必要なハイブリダイズ領域が一つである、
上記(13)または(14)に記載の核酸配列の標的部位を改変する方法。
(16)ガイド領域が、認識領域を2つ含む
上記(15)に記載の核酸配列の標的部位を改変する方法。
(17)導入工程の前に、核酸配列の改変に必要な数の融合タンパク質と複合体を形成できるように、認識領域の数およびRNA配列を少なくとも設計するガイド領域設計工程を含む、
上記(16)に記載の核酸配列の標的部位を改変する方法。
図3および図4を参照して、実施形態に係る改変用組成物1について説明する。図3Aおよび図3Bは、改変用組成物1の概略を示す概略図である。図4Aおよび図4Bは、改変用組成物1の変形例の概略を示す概略図である。なお、以下の説明において、図3Aおよび図3Bに共通する説明は、単に「図3」と記載することがある。
(1)二本鎖DNAの糖とリン酸の間のホスホジエステル結合を加水分解してヌクレオチドとするヌクレアーゼ(nuclease)
(2)二本鎖DNAの片鎖にニックを導入するニッカーゼ(nickase)
(3)DNAのメチル基(例えば、5-メチルシトシン)を脱メチル化するDNA脱メチル化酵素
(4)DNAの塩基に含まれるNH2をc=Oに変化する脱アミノ化酵素
(5)上記(3)および(4)以外のDNAが有する基を置換する酵素
(6)転写活性化因子
(7)転写抑制因子
(1-1)FokI(特許第5266210号公報;T. Sakuma et al.,“Repeating pattern of non-RVD variations in DNA-binding modules enhances TALEN activity”,Scientific Reports 3,Article number:3379 (2013))
(1-2)FirmCutヌクレアーゼ(国際公開第2020/045281号公報)
(2-1)RuvC ヌクレアーゼ・ドメイン D10A点変異(M. Jinek et al.,“A Programmable Dual-RNA-Guided DNA Endonuclease in Adaptive Bacterial Immunity”, Science (2012),Vol.337,Issue 6096,pp.816-821;和研薬株式会社から入手も可能である。)
本酵素は、Cas9の10番目のアミノ酸をアスパラギン酸(D)からアラニン(A)に変えたものである。Cas9に2つあるヌクレアーゼドメインのうちRuvC様ドメインのヌクレアーゼ活性が消失するため、D10A変異体はニッカ―ゼとして作用し、二本鎖DNA切断ではなく、一本鎖DNA切断(ニック)を生じる。ダブルニッキング法では、二本鎖DNAの標的配列に対して各々の鎖まで案内する2つのsgRNAとCas9ニッカ―ゼを作用させる。
(2-2)HNH ヌクレアーゼ・ドメイン H840A点変異(上記(2-1)に記載の文献参照。和研薬株式会社から入手も可能である。)
上記(2-1)に記載の酵素は、DNAのtarget Strandのみを切断するが、(2-2)に記載の酵素はnon-target strandを切断する。
(3-1)メチル化シトシンヒドロキシラーゼTet1(S. Morita et al.,“Targeted DNA demethylation in vivo using dCas9-peptide repeat and scFv-TET1 catalytic domain fusions”, Nature Biotechnology 34,p:1060-1065 (2016))
(4-1)アデノシンデアミナーゼ(C. Li et al.,“Expanded base editing in rice and wheat using a Cas9-adenosine deaminase fusion”,Genome Biology 19,Article number:59(2018))
(4-2)シチジンデアミナーゼ(A. Komor et al.,“Programmable editing of a target base in genomic DNA without double-stranded DNA cleavage”,nature 533,p:420-424(2016))
ヒストンアセチル基転移酵素、ヒストン脱アセチル化酵素、ヒストンリジンメチル基転移酵素、ヒストンリジン脱メチル化酵素等。
(6-1)Vp64(L. Lowder et al.,“Robust Transcriptional Activation in Plants Using Multiplexed CRISPR-Act2.0 and mTALE-Act Systems”,Molecular Plant,Volume 11,Issue 2,2018,p:245-256)
(6-2)Vp16(上記(6-1)に記載の文献参照。)
(7―1)KRAB(M. Boettcher et al.,“Choosing the Right Tool for the Job: RNAi, TALEN, or CRISPR”,Molecular Cell,2015 21;58(4):575-85)
(7-2)SRDX(L. Lowder et al.,“A CRISPR/Cas9 Toolbox for Multiplexed Plant Genome Editing and Transcriptional Regulation”,Plant Physiology,2015,169(2):971-85)
RuvC ヌクレアーゼ・ドメイン D10A点変異、HNH ヌクレアーゼ・ドメイン H840A点変異
<2つの改変ドメイン32>
FokI、アデノシンデアミナーゼ、シチジンデアミナーゼ、Vp16
<4つの改変ドメイン32>
VP64
(1)Nova:5’-UCAY-3’(K. Jensen et al.,“The tetranucleotide UCAY directs the specific recognition of RNA by the Nova K-homology 3 domain”,PNAS,2000,97(11),5740-5745。以下、本論文を「非特許文献1」と記載することがある。)
なお、上記5’-UCAY-3’は、ステムループのループ部分に形成されている。
(2)上記非特許文献1のFIG.6に記載の組合せ(以下の表1参照)。
(4)RNG105(N. Shiinaet et al.,“A Novel RNA-Binding Protein in Neuronal RNA Granules:Regulatory Machinery for Local Translation”,The Journal of Neuroscience,April 27,2005・25(17):4420-4434)
(1)RNA2は、ゲノムDNA4またはRNA4とハイブリダイズするハイブリダイズ領域21と、ガイド領域22とを含む。そして、ガイド領域22は、融合タンパク質3と複合体を形成する認識領域23を1つ以上含む。したがって、図3Aおよび図3Bに示すように、改変ドメイン32が改変機能を有するのが1量体または2量体(若しくはそれ以上)を問わず、ハイブリダイズ領域21は一つでよい。そのため、ハイブリダイズ領域21の設計が容易になる。
(2)特許文献3~6に記載のCRISPR/Cas9は、ゲノムDNA4の標的部位41がPAM配列近傍に制限される。また、Cas13の場合も、RNA4の標的部位41がPFS配列の近傍に制限される。一方、第1の実施形態に係る改変用組成物1は、ゲノムDNA4またはRNA4の配列の制限を受けずに標的部位41を決めることができる。
(3)ガイド領域22に含まれる認識領域23の数を任意に設計できる。したがって、融合タンパク質3の種類に応じてガイド領域22を設計できることから、ガイド領域22の設計の自由度が向上する。
(4)融合タンパク質3は、天然タンパク質(および一部を改変したタンパク質)と異なり、結合ドメイン31として機能する領域および改変ドメイン32として機能する領域を選択して融合することで形成できる。したがって、従来の天然タンパク質(および一部を改変したタンパク質)と比較して、融合タンパク質3のサイズを小さくできる。更に、融合タンパク質3の設計の自由度が向上する。
次に、図4Aおよび図4Bを参照して、実施形態に係る改変用組成物1の変形例1を説明する。図3に示す例では、RNA2のハイブリダイズ領域21およびガイド領域22は、直接接続している。一方、図4Aおよび図4Bに示す変形例では、RNA2は、ハイブリダイズ領域21の一端部に接続した第1相補領域24を含んでいる。そして、第1相補領域24がガイド領域22の一端部側と相補対を形成することで、ハイブリダイズ領域21およびガイド領域22が間接的に接続する。
次に、実施形態に係る改変用組成物1の変形例2を説明する。上記実施形態に係る改変用組成物1および変形例1では、RNA2および融合タンパク質3で改変用組成物1を形成している。代替的に、変形例2として、RNA2を転写するための鋳型となる核酸(以下、「RNA2用鋳型」と記載することがある。)、および、融合タンパク質3を翻訳するための鋳型となる核酸(以下、「融合タンパク質3用鋳型」と記載することがある。)、を用いて改変用組成物1を形成してもよい。RNA2用鋳型および融合タンパク質3用鋳型は、DNAまたはRNAを用いることができる。RNA2用鋳型は、RNA2を転写するための配列を少なくとも含んでいればよい。また、融合タンパク質3用鋳型は、融合タンパク質3を翻訳するための配列を少なくとも含んでいればよい。RNA2用鋳型および融合タンパク質3用鋳型は、必要に応じて、プロモーターや翻訳促進用の非翻訳領域を含んでいてもよい。
次に、実施形態に係る改変用組成物1の変形例3を説明する。上記実施形態に係る改変用組成物1および変形例1では、RNA2および融合タンパク質3を組み合わせて改変用組成物1を形成している。また、変形例2では、RNA2用鋳型および融合タンパク質3用鋳型を組み合わせて改変用組成物1を形成している。代替的に、変形例3では、改変用組成物1を形成する組み合わせ要素の一方のみを提供し、別々に提供された要素を使用の際に組み合すことで、改変用組成物1を形成してもよい。
改変方法は、上記改変用組成物の実施形態および変形例で説明した改変用組成物1を細胞に導入する導入工程と、改変ドメイン32が核酸配列4の標的部位41を改変する改変工程と、を含む。
以下の手順により、改変用組成物1を作製した。
(1)融合タンパク質(FokI-Nova)の作製
融合タンパク質3として、FokI-Novaを作製した。FokI-Novaのアミノ酸配列をSEQ.ID.1(配列番号1)に示す。なお、以下の表3に示すSEQ.ID.1の内、下線部分(1行目右から7列目の“Q”~5行目左から11列目の“F”)がFokIの開裂領域(改変ドメイン32)を示し、二重下線部分(5行目左から28列目の“K”~6行目右から8列目の“G”)がNOVAのRNA結合領域(結合ドメイン31)を示し、太文字下線部分(6行目右から3列目の“P”~7行目左から4列目の“V”)がNLSを示す。その他は、リンカー配列等である。
配列番号1に示すFokI-Novaを発現するように設計した発現ベクターを発現用大腸菌へクローニングした。10ng/μLの濃度に調整した発現ベクター1μLと発現用大腸菌50μLを混合し、氷上で20分静置した。その後、42℃ 1分間処理にてヒートショックを与えた後氷上に戻した。形質転換した大腸菌全量とSOC培地250μLを混合し、37℃で1時間培養した。このうち、100μLをLBプレート(抗生物質入り)に撒いて37℃で一晩培養した。
プレートから単一のコロニーをピックアップし、37℃、overnight培養した。培養液と50%グリセロール溶液を等量混合した後、-80℃で保存した。
<試薬>
・発現用大腸菌:BL21(DE3)pLysS
・抗生物質:カナマイシン
大腸菌グリセロールストックから植菌し、10mlのLB培地(抗生物質入り)にて37℃、overnight培養した。100mLのLB培地(抗生物質入り)に、前培養液を10ml添加し、37℃にて培養した。OD=0.6付近であることを確認し、IPTGを終濃度1mMになるよう添加し、25℃でOver night培養した。菌体に5mlのタンパク質抽出試薬を加えて懸濁した。タンパク質抽出試薬、10μlのLysonase Bioprocessing Reagent(Novagen)を添加し、室温で5分攪拌した。遠心分離にて上清を可溶性画分として回収した。カラムにレジン1mlを入れ、沈降させた。保存液を流した後、平衡バッファーを10bed volumes入れ、レジンを平衡化した。
可溶性画分をカラムに加え、His-Tag融合タンパク質を結合させた。8bed volumesの平衡バッファーにてカラムを洗浄した。7bed volumesの平衡バッファー(10mM Imidazoleを含む)にてカラムを洗浄した。3bed volumesの溶出バッファーにてHis-Tag融合タンパク質を溶出した。
精製後のタンパク質を、EzApply(ATTO)と等量混合し、95℃ 5min熱処理を行い電気泳動サンプルを調整した。5-20% ポリアクリルアミドゲルにサンプルをアプライし、20mA 70min泳動した。FokI抗体を使用し、設計したサイズのFokI-Nova融合タンパク質を合成できたことを確認した。
<試薬>
・タンパク質抽出試薬:BugBuster Protein Extraction Reagent(Novagen)
・精製レジン:TALON Metal Affinity Resin(タカラバイオ)
・平衡バッファー:50mM sodium phosphate,300mM sodium chloride;pH7.4
・溶出バッファー:50mM sodium phosphate,300mM sodium chloride,150mM imidazole;pH7.4
・泳動バッファー:25mM Tris pH8.3,192mM Glycine,0.1% SDS
実施例で作製したRNA2の配列をSEQ.ID.2に示す。RNA2は、以下の手順により作製した。
(a)ハイブリダイズ領域21
pEGFP-N1(SEQ.ID.3)を鋳型に、
・Fwプライマー(eGFP Xba5P:5’-GCTCTAGAAAACGGCCACAAGTTCAGCGTGTC-3’:SEQ.ID.4)
・Rvプライマー(eGFP Spe3P:5’-TGACTAGTGGGTGTCGCCCTCGAACTTCACCT-3’:SEQ.ID.5)
を用い、290bpを増幅し、両端に制限酵素サイトを付加した。pCR2.1ベクターに、XbaIとSpeIで常法によりligationした。
なお、SEQ.ID.4および5のアンダーライン部分は、図5に示すGFPをコードするDNA配列4と相補対を形成する配列(ハイブリダイズ領域21の両端部)である。なお、図5では、紙面の都合上、配列番号の「ID.」を省略して記載する。
(b)ガイド領域22
UCAY5P(5’-TCGGATCCGCAGTCTCATCATCATTTTCATTTTGTTCGTTAGCACATTGGGCAGTCTCAT-3’:SEQ.ID.6)、および、UCAY3P(5’-GAAGATCTCAAAATGAAAATGATGATGAGACTGCCCAATGTGCTAACGAACAAAATGAAA-3’:SEQ.ID.7)をアニールし、伸長反応を行った。BamHIサイトにアニールした鋳型をBamHIとBglIIで制限酵素処理し、上記(a)の下流側に常法によりligationを行った。
(c)RNA2の合成
pCR2.1ベクターをHindIIIで制限酵素処理をおこない、in vitro Transcription T7 KitでRNAを合成した。
なお、RNA2は、認識領域23として非特許文献1のFIG.6のα2-glyR(GCAGUCUCAUCAUCAUUUUCAUUUUG:SEQ.ID.8)を、リンカーを介して2つ含む。
実施例1で作製した改変用組成物1を用い、以下の手順でGFPをコードするゲノムDNA4(SEQ.ID.9)の切断実験を行った。図5は実施例2の概略を示す図である。
(1)GFPのPCR増幅
SEQ.ID.3を鋳型にして、以下のプライマーを用い常法によりSEQ.ID.9に示すGFPのPCR産物を得た。
・Fwプライマー(5’-GTGAGCAAGGGCGAGGAGCTG-3’:SEQ.ID.10)
・Rvプライマー(5’-CTTGTACAGCTCGTCCATGCCG-3’:SEQ.ID.11)
M:100bp Marker
1:GFPのPCR産物のみ
2:GFPのPCR産物+融合タンパク質
3:GFPのPCR産物+融合タンパク質+RNA
(1)バンド抽出物の増幅
1:FwプライマーにSEQ.ID.10、RvプライマーにSEQ.ID.12を用いて、バンド抽出物を増幅した。増幅産物の長さは221bpである。
2:FwプライマーにSEQ.ID.13、RvプライマーにSEQ.ID.11を用いて、バンド抽出物を増幅した。増幅産物の長さは251bpである。
(2)SEQ.ID.3を鋳型にしたGFP断片の増幅
3:FwプライマーにSEQ.ID.10、RvプライマーにSEQ.ID.12を用いて、GFP断片をコードする配列を増幅した。増幅産物の長さは221bpである。
4:FwプライマーにSEQ.ID.13、RvプライマーにSEQ.ID.11を用いて、GFP断片をコードする配列を増幅した。増幅産物の長さは251bpである。
なお、SEQ.ID.12および13の配列は以下の通りである。
・SEQ.ID.12:5’-TAGCGGCTGAAGCACTGCAC-3’
・SEQ.ID.13:5’-ACAAGCAGAAGAACGGCATCAAG-3’
Claims (17)
- RNAおよび融合タンパク質を含む核酸配列改変用組成物であって、
RNAは、
核酸配列の標的部位の5’側または3’側の配列にハイブリダイズし得るハイブリダイズ領域と、
融合タンパク質をガイドするガイド領域と、
を含み、
ガイド領域は、融合タンパク質と複合体を形成する認識領域を含み、
融合タンパク質は、
前記RNAの認識領域を認識し、認識領域と複合体を形成する結合ドメインと(但し、結合ドメインがCasタンパク質群のRNA認識領域を含むことを除く。)、
核酸配列の標的部位を改変する改変ドメインと、
を含む
核酸配列改変用組成物。 - 融合タンパク質は、結合ドメインおよび改変ドメインを連結するリンカー配列を含む
請求項1に記載の核酸配列改変用組成物。 - ガイド領域が、認識領域を2つ含む
請求項1または2に記載の核酸配列改変用組成物。 - ハイブリダイズ領域の一端部に接続した第1相補領域を含み、
第1相補領域がガイド領域の一端部側と相補対を形成することで、ハイブリダイズ領域およびガイド領域が間接的に接続する
請求項1~3の何れか一項に記載の核酸配列改変用組成物。 - ガイド領域が、ステムループを含む
請求項1~4の何れか一項に記載の核酸配列改変用組成物。 - 結合ドメインが、NovaのRNA結合領域を含み、
改変ドメインが、ゲノムDNAを切断するFokIの開裂領域を含む
請求項1~5の何れか一項に記載の核酸配列改変用組成物。 - 核酸配列が、ゲノムDNAである
請求項1~6の何れか一項に記載の核酸配列改変用組成物。 - 請求項1~7の何れか一項に記載のRNAを転写するための鋳型となる核酸、および、
請求項1~7の何れか一項に記載の融合タンパク質を翻訳するための鋳型となる核酸、
を含む
核酸配列改変用組成物。 - 請求項1~7の何れか一項に記載の核酸配列改変用組成物を形成するための、RNA。
- 請求項8に記載の核酸配列改変用組成物を形成するための、RNAを転写するための鋳型となる核酸。
- 請求項1~7の何れか一項に記載の核酸配列改変用組成物を形成するための、融合タンパク質。
- 請求項8に記載の核酸配列改変用組成物を形成するための、融合タンパク質を翻訳するための鋳型となる核酸。
- 核酸配列の標的部位を改変する方法であって、該方法は、
請求項1~8の何れか一項に記載の核酸配列改変用組成物を細胞に導入する導入工程と、
改変ドメインが核酸配列の標的部位を改変する改変工程と、
を含む
核酸配列の標的部位を改変する方法。 - 導入工程の前に、核酸配列の標的部位の5’側または3’側の配列にハイブリダイズし得るハイブリダイズ領域を特定するハイブリダイズ領域特定工程を含む
請求項13に記載の核酸配列の標的部位を改変する方法。 - 一つの標的部位を改変するために必要なハイブリダイズ領域が一つである、
請求項13または14に記載の核酸配列の標的部位を改変する方法。 - ガイド領域が、認識領域を2つ含む
請求項15に記載の核酸配列の標的部位を改変する方法。 - 導入工程の前に、核酸配列の改変に必要な数の融合タンパク質と複合体を形成できるように、認識領域の数およびRNA配列を少なくとも設計するガイド領域設計工程を含む
請求項16に記載の核酸配列の標的部位を改変する方法。
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Also Published As
| Publication number | Publication date |
|---|---|
| EP4400586A1 (en) | 2024-07-17 |
| EP4400586A4 (en) | 2025-04-30 |
| JP2023038817A (ja) | 2023-03-17 |
| JP2023038910A (ja) | 2023-03-17 |
| US20250034560A1 (en) | 2025-01-30 |
| JP7125727B1 (ja) | 2022-08-25 |
| CN117916370A (zh) | 2024-04-19 |
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