WO2020218419A1 - 脳に指向性を有するaav変異体 - Google Patents
脳に指向性を有するaav変異体 Download PDFInfo
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- WO2020218419A1 WO2020218419A1 PCT/JP2020/017495 JP2020017495W WO2020218419A1 WO 2020218419 A1 WO2020218419 A1 WO 2020218419A1 JP 2020017495 W JP2020017495 W JP 2020017495W WO 2020218419 A1 WO2020218419 A1 WO 2020218419A1
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- aav
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- capsid protein
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- C12N2750/00011—Details
- C12N2750/14011—Parvoviridae
- C12N2750/14111—Dependovirus, e.g. adenoassociated viruses
- C12N2750/14141—Use of virus, viral particle or viral elements as a vector
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- C12N2750/14141—Use of virus, viral particle or viral elements as a vector
- C12N2750/14145—Special targeting system for viral vectors
Definitions
- the present invention relates to a nucleic acid encoding a variant of an adeno-associated virus (AAV) capsid protein having brain orientation, AAV particles containing the variant of the capsid protein, and a method for producing a gene-introduced cell using the particle.
- AAV adeno-associated virus
- AAV is a virus whose genome is a 4.7 kb single-strand DNA containing two open reading frame rep genes and cap genes.
- the rep gene encodes four proteins required for genome replication (Rep78, Rep68, Rep52, and Rep40), and the cap gene is a three capsid proteins (VP1, VP2, VP3) that assemble for viral capsid formation. ) And Assembly-Activating Protein (AAP) are expressed.
- the replication of AAV in nature depends on the presence of helper viruses such as adenovirus and herpesvirus. In the absence of helper viruses, AAVs either maintain their genome in episomes or become integrated into host chromosomes and become latent.
- helper viruses such as adenovirus and herpesvirus.
- AAVs either maintain their genome in episomes or become integrated into host chromosomes and become latent.
- AAV serotypes and clades Non-Patent Document 1
- AAV2 is being developed as a gene delivery vector.
- AAV particles Long-term stable gene transfer into various target organs and target cells is possible by administration of AAV particles. To date, it has been shown to introduce genes into skeletal muscle, liver (hepatocytes), heart (myocardial cells), nerve cells, pancreatic gland cells, and islet cells with high efficiency. In addition, AAV has a track record of being used in human clinical trials. On the other hand, attempts have been made to modify the capsid protein of AAV to change the cell directivity of AAV and to avoid removal of AAV particles by neutralizing antibodies.
- AAV capsids that are directional to specific organs or cells such as glial cells, airway epithelial cells, coronary vascular endothelial cells or lungs, and to tumor cells such as glioblastoma, melanoma, lung cancer or breast cancer.
- AAV capsids having the above have been produced (Non-Patent Document 2).
- An object of the present invention is to provide an AAV capsid protein mutant having a directivity to the brain and to provide a method for efficiently introducing a gene into the brain.
- the present inventors have produced a target AAV particle containing an AAV capsid protein containing an amino acid sequence selected from the group consisting of SEQ ID NO: 15 to SEQ ID NO: 62, and the present invention.
- a target AAV particle containing an AAV capsid protein containing an amino acid sequence selected from the group consisting of SEQ ID NO: 15 to SEQ ID NO: 62 and the present invention.
- a nucleic acid encoding an adeno-associated virus (AAV) capsid protein variant containing a peptide containing the deleted, inserted and / or added amino acid sequence [2] The nucleic acid according to [1], wherein the AAV capsid protein is derived from AAV2.
- AAV adeno-associated virus
- Recombinant DNA containing the nucleic acid according to any one of [1] to [3].
- a cell containing the nucleic acid according to any one of [1] to [3] or the recombinant DNA according to [4].
- One or several amino acids are substituted in the peptide containing the amino acid sequence selected from the group consisting of SEQ ID NO: 15 to SEQ ID NO: 62, or in the amino acid sequence selected from the group consisting of SEQ ID NO: 15 to SEQ ID NO: 62.
- AAV particles containing an AAV capsid protein variant containing a peptide containing a deleted, inserted and / or added amino acid sequence [7] The AAV particles according to [6], wherein the AAV capsid protein is derived from AAV2. [8] The AAV particle according to [7], wherein the peptide is contained at a position between amino acid number 588 and amino acid number 589 of VP1 of AAV2. [9] One or several amino acids are substituted in the peptide containing the amino acid sequence selected from the group consisting of SEQ ID NO: 15 to SEQ ID NO: 62, or in the amino acid sequence selected from the group consisting of SEQ ID NO: 15 to SEQ ID NO: 62.
- a method for producing transgenic cells comprising contacting the cell with AAV particles comprising an AAV capsid protein variant containing a peptide containing a deleted, inserted and / or added amino acid sequence.
- AAV capsid protein is derived from AAV2.
- the peptide is contained at a position between amino acid number 588 and amino acid number 589 of VP1 of AAV2.
- the present invention provides a gene transfer system useful for gene transfer into the brain.
- the AAV particles of the present invention have high cell directivity to the brain and can strongly express the introduced gene.
- Adeno-associated virus refers to a small virus belonging to the genus Parvoviridae, the genus Dependvirus, which infects primate animals including humans and other mammals.
- Adeno-Associated Virus will be abbreviated as AAV.
- AAV has an envelopeless icosahedron outer shell (capsid) and a single single-strand DNA inside it.
- AAV includes wild-type viruses and derivatives thereof, and includes all serotypes and clades unless otherwise specified.
- vector means a molecule or an aggregate of molecules that may contain or associate with a polynucleotide and be used to mediate the delivery of the polynucleotide to a cell.
- examples include vector DNAs such as plasmid vectors and phage vectors, viral vector particles, liposomes, and other gene delivery vehicles, all of which are included in the vector unless otherwise noted.
- the "capsid protein” is a protein encoded by the cap gene existing in the AAV genome, and means a protein constituting the capsid of AAV.
- the wild-type AAV genome encodes three capsid proteins, with VP1, VP2 and VP3 present. In the present specification, all of VP1, VP2 and VP3 are included in the capsid protein.
- the term "several" with respect to amino acid substitutions, deletions, insertions and / or additions means, for example, 2, 3, 4, 5, 6, depending on the length of the reference amino acid sequence. Refers to 7, 8, or 9.
- nucleic Acid Encoding AAV Capsid Protein Variant The nucleic acid of the present invention is a peptide containing an amino acid sequence selected from the group consisting of SEQ ID NO: 15 to SEQ ID NO: 62, or from the group consisting of SEQ ID NO: 15 to SEQ ID NO: 62.
- the nucleic acid of the present invention is a nucleic acid encoding an AAV capsid protein variant containing a peptide containing an amino acid sequence selected from the group consisting of SEQ ID NO: 15 to SEQ ID NO: 62.
- the nucleic acid of the present invention is a peptide containing an amino acid sequence selected from the group consisting of SEQ ID NO: 15, SEQ ID NO: 16, SEQ ID NO: 17, SEQ ID NO: 18, SEQ ID NO: 19 and SEQ ID NO: 20 or SEQ ID NO:
- One or several amino acids have been substituted, deleted, inserted and / or added in the amino acid sequence selected from the group consisting of 15, SEQ ID NO: 16, SEQ ID NO: 17, SEQ ID NO: 18, SEQ ID NO: 19 and SEQ ID NO: 20.
- It is a nucleic acid encoding an AAV capsid protein variant containing a peptide containing an amino acid sequence.
- a peptide containing an amino acid sequence in which one or several amino acids are substituted, deleted, inserted and / or added in the amino acid sequence represented by the above-mentioned SEQ ID NO: is the above-mentioned sequence when the peptide is contained in the AAV capsid protein. It is a peptide that maintains the cell orientation of the AAV capsid protein variant containing a peptide containing the amino acid sequence indicated by the number. That is, the number of amino acids substituted, deleted, inserted and / or added in the amino acid sequence represented by the above SEQ ID NO: is the AAV capsid protein variant in which the peptide containing the amino acid sequence represented by the above SEQ ID NO: contains the peptide.
- the cell orientation given to the protein for example, in the case of substitution, deletion and / or insertion, for example, 1 to 5, preferably 1 to 4, and more preferably 1, 2 or 3.
- the peptide contained in the AAV capsid protein variant is at least 70%, at least 75%, at least 80%, at least 85%, or at least the amino acid sequence selected from the group consisting of SEQ ID NO: 15 to SEQ ID NO: 62. It may be a peptide containing 90% of the same amino acid sequence.
- a peptide containing an amino acid sequence that is at least 70%, at least 75%, at least 80%, at least 85%, or at least 90% identical to the amino acid sequence represented by the above SEQ ID NO: is when the peptide is contained in the AAV capsid protein.
- the cell orientation of the AAV capsid protein variant containing the peptide containing the amino acid sequence represented by the above SEQ ID NO: is maintained.
- the peptide contained in the AAV capsid protein variant is Formula I: X 1 X 2 GX 3 GWV; Formula II: X 4 X 5 X 6 X 7 GWV; Formula III: X 8 X 9 GX 10 X 11 WV; Formula IV: X 12 X 13 GX 14 GX 15 V; Formula V: X 16 X 17 GX 18 GWX 19 ; or formula VI: X 20 X 21 GX 22 REX 23 [In the formula, X 1 to X 23 are any amino acid residues, G represents glycine, W represents tryptophan, V represents valine, R represents arginine, and E represents glutamic acid.
- X 1 is E (glutamic acid), G (glycine) or T (threonine) and X 2 is R (arginine), T (threonine), S (serine), N (asparagine), E (glutamic acid) or D (aspartic acid), and X 3 is V (valine), H (histidine), R, M (methionine) or L (leucine).
- X 4 is A (alanine) or E
- X 5 is D, G or A
- X 6 is K (lysine)
- Q glutamine
- X 7 is V or L
- X 8 is A, E or G
- X 9 is S, D, G or R
- X 10 is T, M, It is D or V
- X 11 is R, V, S or T.
- X 12 is D, E, G or R
- X 13 is A, G, D or V
- X 14 is I, It is H, D, F (phenylalanine), G or L
- X 15 is Y (tyrosine), F, R, G or V.
- X 16 is A, E or G
- X 17 is G, R or S
- X 18 is V, H or D.
- X 19 are T, G, K, I (isoleucine) or A.
- X 20 is E or A
- X 21 is Y or H
- X 22 is F or Y
- X 23 is G or. It is P (proline).
- peptides comprising the amino acid sequence represented by Formula I include, but are not limited to, an amino acid sequence selected from the group consisting of SEQ ID NOs: 18, 20, 21, 22, 46, 55, 59 and 60.
- Peptides containing the sequence are included.
- the peptide containing the amino acid sequence represented by the formula II is not limited to, but is not limited to, a peptide containing an amino acid sequence selected from the group consisting of SEQ ID NOs: 25, 29 and 32, or peptides of SEQ ID NOs: 25, 29 and 32.
- Peptides comprising an amino acid sequence in which 1 to 4 amino acids have been substituted, deleted, inserted and / or added in the amino acid sequence selected from the group consisting of are included.
- the peptide containing the amino acid sequence represented by the formula III is, but is not limited to, a peptide containing an amino acid sequence selected from the group consisting of SEQ ID NOs: 15, 24, 38, 48 and 54, or SEQ ID NO: 15.
- Peptides comprising an amino acid sequence in which 1 to 4 amino acids have been substituted, deleted, inserted and / or added in the amino acid sequence selected from the group are, but is not limited to, a peptide or sequence containing an amino acid sequence selected from the group consisting of SEQ ID NOs: 19, 31, 35, 44, 56 and 58.
- Peptides comprising an amino acid sequence in which 1 to 4 amino acids have been substituted, deleted, inserted and / or added in an amino acid sequence selected from the group consisting of numbers 19, 31, 35, 44, 56 and 58 are included. ..
- the peptide containing the amino acid sequence represented by the formula V is not limited to the peptide containing the amino acid sequence selected from the group consisting of SEQ ID NOs: 26, 39, 42, 43, 47 and 50, or the sequence.
- Peptides comprising an amino acid sequence in which 1 to 4 amino acids have been substituted, deleted, inserted and / or added in an amino acid sequence selected from the group consisting of numbers 26, 39, 42, 43, 47 and 50 are included. ..
- the peptide containing the amino acid sequence represented by the formula VI is not limited to the peptide containing the amino acid sequence represented by SEQ ID NO: 16 or 17, or 1 to 1 in the amino acid sequence represented by SEQ ID NO: 16 or 17. Peptides containing amino acid sequences in which four amino acids have been substituted, deleted, inserted and / or added are included.
- the AAV capsid protein variants encoded by the nucleic acids of the invention are type 1 AAV (AAV1), type 2 AAV (AAV2), type 3 AAV (AAV3A, AAV3B, etc.), type 4 AAV (AAV4), type 5 AAV (AAV5).
- AAV6 6-inch AAV
- AAV7 7-inch AAV
- AAV8 8-inch AAV
- AAV9 9-inch AAV
- 10-inch AAV AAV
- AAV10 11-inch AAV (AAV11)
- tri-AAV bovine AAV
- Insert the peptide into any wild-type AAV capsid protein such as canine AAV, horse AAV, sheep AAV, or replace part of the amino acid sequence of the AAV capsid protein with the peptide (ie, replace the peptide with the AAV capsid protein).
- the capsid protein of AAV2 can be used particularly preferably.
- the AAV capsid protein variant encoded by the nucleic acid of the invention is substituted, deleted, inserted and / or added with one or more amino acids in addition to the above peptide retained in the wild-type AAV capsid protein. It may be a protein.
- the "protein in which one to several or more amino acids have been substituted, deleted, inserted and / or added in addition to retaining the peptide" is conferred by the properties of the original protein, eg, the peptide.
- AAV capsid protein A protein that maintains cell orientation, capsid forming ability, capsid protein function (for example, protection of viral genome, unshelling after host cell invasion, etc.).
- a spacer sequence may be added to the N-terminal and / or C-terminal of the peptide contained in the AAV capsid protein in the present invention.
- the spacer sequence is preferably 1 to 5 amino acid residues.
- the amino acid in the spacer sequence is not particularly limited, but for example, an amino acid selected from the group consisting of glycine, alanine and serine can be used.
- any of AAV's VP1, VP2 and VP3 can be used.
- the peptide may be contained only in VP1, only VP2 or only VP3, and all capsid proteins of VP1 to VP3 may contain the peptide.
- it may be contained in two kinds of capsid proteins such as a combination of VP1 and VP2, VP2 and VP3, VP1 and VP3.
- VP1 to VP3 are encoded in the cap gene region of the AAV genome.
- a peptide can be contained in a region common to VP1 to VP3 to introduce a mutation into all of VP1 to VP3.
- a gene encoding VP1, VP2 or VP3 can be prepared separately from the cap gene region of AAV, and a mutation can be introduced into this gene.
- treatment may be performed so that the wild-type capsid protein corresponding to the capsid protein encoded by the gene into which the mutation is introduced is not expressed from the cap gene region of AAV.
- the position where the peptide is contained in the AAV capsid protein variant encoded by the nucleic acid of the present invention is preferably the position between amino acid number 588 and amino acid number 589.
- Amino acid number 588 of VP1 of AAV2 is arginine
- amino acid number 589 of VP1 of AAV2 is glutamine.
- the amino acid number 588 of AAV2 VP1 corresponds to the amino acid number 451 of VP2 of AAV2 and the amino acid number 386 of VP3 of AAV2.
- a capsid protein derived from a serum type other than AAV2 or AAV of a clade is used as the AAV capsid protein, it is preferably between the amino acids corresponding to amino acids 588 and 589 of VP1 of AAV2 in the AAV capsid protein. Incorporate the peptide at the position.
- amino acids of AAV capsid proteins of serotypes other than AAV2 or clades that correspond to amino acids number 588 of VP1 of AAV2.
- Gao et al., Proc. Natl. Acad. Sci. U.S.A., Vol. 99, No. 18, pp. 11854-1859, 2002 Aligning the amino acid sequence of VP1.
- the amino acid number 588 of VP1 of AAV2 is 589 for AAV1, 590 for AAV7, and 591 for AAV8.
- the nucleic acid of the present invention may be operably linked to an appropriate control sequence.
- Control sequences include promoter sequences, polyadenylation signals, transcription termination sequences, upstream regulatory domains, origins of replication, internal ribosome entry sites (IRES), enhancers and the like.
- the promoter sequence includes an inducible promoter sequence and a constitutive promoter sequence.
- the control sequence may be specific to the AAV from which the capsid protein is derived, or may be exogenous, and may be a natural sequence or a synthetic sequence. Recombinant DNA capable of expressing such an AAV capsid protein variant is also included in the present invention.
- the recombinant DNA of the present invention is useful for delivering the nucleic acid of the present invention to cells in vitro, in vitro and in vivo, and imparting the ability to express the AAV capsid protein mutant to the cells.
- the cells to which the nucleic acids of the invention have been delivered are then useful for producing AAV particles.
- the recombinant DNA can be used, in particular, to deliver or introduce the nucleic acids of the invention into animal cells, more preferably mammalian cells.
- the recombinant DNA of the present invention can be prepared by retaining the nucleic acid of the present invention in the DNA used as a vector.
- plasmid DNA, phage DNA, transposon, cosmid DNA, episomal DNA, viral genome can be used.
- the present invention also provides a host cell containing the nucleic acid of the present invention, specifically, the recombinant DNA of the above (1), for example, an isolated host cell.
- the isolated cells are, for example, cell lines maintained in vitro.
- the host cell of the present invention is useful for producing the AAV particles of the present invention as described below.
- the host cells of the invention When used to produce AAV particles, they may be referred to as "packaging cells" or "producer cells.”
- the recombinant DNA of the present invention described in (1) above may be integrated into the genome, and the recombinant DNA is intracellularly expressed so as to transiently express the AAV capsid protein mutant. It may be held in.
- Introduction of the recombinant DNA of the present invention into a host cell can be carried out by a known method. For example, electroporation, calcium phosphate precipitation, direct microinjection into cells, liposome-mediated gene transfer, nucleic acid delivery using a high-speed microparticle gun, and the like can be used.
- electroporation calcium phosphate precipitation
- direct microinjection into cells liposome-mediated gene transfer
- nucleic acid delivery using a high-speed microparticle gun and the like
- an infection method suitable for the vector may be selected.
- the recombinant DNA of the present invention is stably introduced into the chromosome of the host cell or transiently into the cytoplasm of the host cell.
- neomycin resistance gene encoding neomycin phosphotransferase
- hygromycin B resistance gene encoding aminoglycoside phosphotransferase (APH)
- APH aminoglycoside phosphotransferase
- Suitable mammalian cells include, but are not limited to, primary cells and cell lines, and suitable cell lines include 293 cells, COS cells, HeLa cells, Vero cells, 3T3 mouse fibroblasts, C3H10T1 / 2. Examples include fibroblasts, CHO cells and cells derived from these cells.
- AAV particles containing an AAV capsid protein containing an amino acid sequence encoded by the nucleic acid of the present invention are AAV capsid protein variants containing the peptide described in (1) above.
- the AAV particles of the present invention can be produced by the host cell described in (2) above.
- the AAV particles of the present invention have directivity in the brain and are useful for gene transfer into the brain.
- the brain contains nerve cells and brain cells such as glial cells (microglia, oligodendrocytes, astrocytes).
- the gene introduced by the AAV particles of the present invention is strongly expressed in the tissues, organs and cells.
- AAV particles can be produced by using cells containing some components necessary for producing AAV particles as packaging cells.
- the first component is a vector genome (also called an expression vector) of recombinant AAV that can be replicated and packaged into AAV particles in the host cell.
- the vector genome of recombinant AAV has the desired heterologous polynucleotide and the AAV inverse terminal repeat (ITR) sequences on either side of it, i.e. on the 5'and 3'sides, respectively.
- the desired heterologous polynucleotide may have a regulatory sequence for its expression.
- the nucleotide sequence of the ITR sequence is known. For example, for the ITR sequence of AAV2, Kotlin R. et al.
- ITR sequence an ITR sequence derived from any of various AAV serotypes such as AAV1, AAV2, AAV3, AAV4, AAV5, AAV7 can be used.
- the ITR sequence used in the present invention may be a sequence derived from wild-type AAV, or may be modified by insertion, deletion or substitution of nucleotides.
- the ITR sequence allows replication of the vector genome of recombinant AAV in the presence of Rep protein and allows integration into capsid particles during AAV particle formation.
- the desired heterologous polynucleotides that can be loaded into the AAV particles of the invention are generally less than about 5 kilobases (kb) in size, eg, genes encoding desired proteins that are missing or lost in the recipient, desired.
- Genes encoding proteins with biological or therapeutic effects eg, antibacterial, antiviral or antitumor effects
- desired nucleotide sequences encoding RNAs that inhibit or reduce the production of harmful or unwanted proteins antigens
- the nucleotide sequence encoding the sex protein can be appropriately set according to the purpose.
- the vector genome of the recombinant AAV lacks the cap gene region and / or the rep gene region, and the AAV particles in which the vector genome of the recombinant AAV of this embodiment is packaged are infected cells. It is not replicated to AAV particles by itself within.
- the second component required for the production of AAV particles is a construct that provides a protein encoded by wild-type AAV.
- This construct encodes an AAV-derived gene that provides the AAV gene product required for the formation of AAV particles. That is, it contains one or both of the rep gene region and the cap gene region coding region, which are the major AAV ORFs.
- the cap gene is a nucleic acid encoding an AAV capsid protein variant containing a peptide having an amino acid sequence selected from the group consisting of at least SEQ ID NO: 15 to SEQ ID NO: 62 in the sequence listing. Used as.
- the host cell of the present invention described in (2) above which has the ability to express this mutant, can be used for producing AAV particles.
- AAV particles have an outer shell composed of a large number of capsid proteins, but all capsid proteins may be mutants, some of which may be mutants and the rest of which may be wild-type capsid proteins. Further, the capsid protein mutant contained in the AAV particles of the present invention may be one kind of mutant or a plurality of kinds of mutants.
- the AAV rep gene is contained in the rep gene coding region and contains genes encoding the replication proteins Rep 78, Rep 68, Rep 52 and Rep 40. These Rep expression products have been shown to have many functions, including recognition, binding and nicking of AAV genomic DNA replication origins, DNA helicase activity and transcriptional alterations of AAV-derived promoters.
- helper virus function also called an accessory function
- Adenovirus is generally used to introduce the helper function, but viruses such as type 1 or type 2 herpes simplex virus and vaccinia virus can also be used.
- viruses such as type 1 or type 2 herpes simplex virus and vaccinia virus can also be used.
- the host cell is infected with the virus as a helper virus.
- adenoviruses that do not exhibit late gene expression may be used because only the expression of the early gene of the adenovirus is required for packaging the AAV particles.
- Adenovirus variants lacking late gene expression eg, ts100K or ts149 adenovirus variants) can be used.
- nucleic acid required for helper virus function isolated from helper virus can be used to prepare a nucleic acid construct that provides helper virus function and be introduced into a host cell.
- Constructs that provide helper virus function contain a nucleotide sequence that provides one or more helper virus functions and are provided to the host cell in the form of plasmids, phages, transposons, cosmids or other viruses.
- the host is (a) a step of introducing the vector genome of recombinant AAV, which is the first component, into a host cell, and (b) a structure that provides the AAV helper function, which is the second component.
- the step of introducing into the cell and (c) the step of introducing the helper virus function, which is the third component, into the host cell are carried out. These steps may be carried out simultaneously or in sequence.
- the order of the steps (a) to (c) may be any order.
- the expressed capsid protein forms a capsid, and the vector genome of the recombinant AAV is packaged in the capsid to produce AAV particles.
- the outer shell of the produced AAV particles contains the AAV capsid protein variant.
- AAV particles can be isolated and purified from the culture supernatant of a host cell or its cell lysate by using various purification methods such as CsCl density gradient centrifugation.
- a virus is used in step (c)
- a step of separating AAV particles and helper virus based on size may be added.
- AAV particles can also be isolated from helper viruses based on the difference in affinity for heparin.
- the remaining helper virus can be inactivated using known methods.
- adenovirus can be inactivated by heating at a temperature of about 60 ° C. for, for example, 20 minutes or more. Since AAV particles are extremely heat stable, this procedure is effective in the selective removal of adenovirus used as a helper virus.
- AAV particle of the present invention obtained by the above (3) is used for delivery of a desired heterologous polynucleotide to a cell for gene therapy or other purposes. ..
- AAV particles are introduced into cells either in vivo or in vitro. When introduced in vitro, it is introduced by bringing AAV particles into contact with cells obtained from a living body. These cells can also be transplanted into a living body. When the cells are introduced into a living body, they can be formulated as a pharmaceutical composition and various techniques such as intramuscular, intravenous, subcutaneous and intraperitoneal administration can be used.
- AAV particles are formulated as a pharmaceutical composition and generally administered parenterally (eg, by route of administration such as intramuscular, subcutaneous, intratumoral, transdermal, intrathecal).
- the pharmaceutical composition containing the AAV particles may contain a carrier that is acceptable as a drug and, if necessary, other drugs, pharmaceuticals, stabilizers, buffers, carriers, adjuvants, diluents and the like.
- Example 1 Preparation of AAV2 random peptide plasmid library
- a plasmid vector pAV1 (ATCC Number: 37215) carrying the AAV2 genome was extracted from Escherichia coli HB101 of a general-purpose host (Distribution host).
- Genomic DNA (about 4.7 kb) of AAV2 was excised from the extracted plasmid by the restriction enzyme BglII (manufactured by Takara Bio Inc.).
- This genomic DNA was inserted into pUC118 BamHI / BAP (manufactured by Takara Bio Inc.), and the obtained plasmid DNA was designated as AAV2WG / pUC118.
- AAV2WG / pUC118 was treated with the restriction enzyme ScaI (manufactured by Takara Bio Inc.) to obtain a fragment of about 0.8 kb containing the 1190 to 2017 bases of the cap gene. This fragment was inserted into pUC118 HincII / BAP (manufactured by Takara Bio Inc.), and the obtained plasmid DNA was designated as Cap-ScaI / pUC118.
- the 1759th to 1761st nucleotide sequences AAC (587N) of the Cap gene of Cap-ScaI / pUC118 were converted to CAG (587Q) using the PCR method, and GGC as a spacer between the 1764th and 1765th nucleotides.
- CAAG as a stuffer, and 10 bases of GCC as a spacer are inserted, and the bases CAA (589Q) GCA (590A) GCT (591A) of the 1765th to 1773th bases are converted to CAG (589Q) GCG (590A) GCC (591A).
- the letters in parentheses indicate the amino acid number and the amino acid encoding).
- spacers, stuffers, and spacers sandwiched between two recognition sites for the restriction enzyme SfiI and the SfiI recognition sites were inserted.
- the base sequences before and after the conversion of the 1756th to 1773th cap genes are shown in FIG.
- Cap-ScaI-S4 / pUC118 The plasmid DNA after converting the base sequence was designated as Cap-ScaI-S4 / pUC118.
- the Cap gene portion of Cap-ScaI-S4 / pUC118 was amplified by PCR for In-Fusion Cloning to obtain a fragment of about 0.8 kb, which was used as insert DNA.
- a sequence not recognized by these restriction enzymes by introducing a mutation into the base sequence of the restriction enzyme ScaI recognition site in the ampicillin resistance gene of AAV2WG / pUC118 and the restriction enzyme SfiI recognition site in the Rep gene by the PCR method. Modified to.
- the ScaI recognition site the nucleotide sequence GAG (E) at positions 304 to 306 of the ampicillin resistance gene was converted to GAA (E).
- the base sequence before conversion is shown in SEQ ID NO: 3
- the base sequence after conversion is shown in SEQ ID NO: 4.
- the recognition site of SfiI the nucleotide sequence GCC (A) at positions 217 to 219 of the Rep gene was converted to GCA (A).
- the base sequence before conversion is shown in SEQ ID NO: 5, and the base sequence after conversion is shown in SEQ ID NO: 6.
- the plasmid DNA thus obtained was treated with ScaI (manufactured by Takara Bio Inc.) to obtain a linear vector lacking about 0.8 kb, which is a part of the Cap gene. This was used as a linear vector for In-Fusion Cloning.
- insert DNA was inserted into the above linear vector using In-Fusion (registered trademark) HD Cloning Kit (manufactured by Cloning) and Cloning Enhancer (manufactured by Cloning), and directional cloning was performed.
- the plasmid DNA thus obtained was designated as AAV2WG-Cap-ScaI-S4 / pUC118Sx.
- OligoDNA (SEQ ID NO: 7) containing a nucleotide sequence encoding a 7-amino acid random peptide was prepared by artificial synthesis, and using a primer (SEQ ID NO: 8) and Klenow Fragment (manufactured by Takara Bio Co., Ltd.) for 3 hours at 37 ° C.
- Double-stranded DNA was prepared from oligo DNA by reaction.
- Double-stranded DNA purified using Nucleotide remote kit (manufactured by Qiagen) was digested with the restriction enzyme BglI (manufactured by Takara Bio Inc.).
- the plasmid inserted into AAV2WG-Cap-ScaI-S4 / pUC118Sx obtained by digesting this DNA with SfiI using a DNA ligation kit ⁇ Mighty Mix> (manufactured by Takara Bio Inc.) was designated as AAV2WG-RPL / pUC118Sx, and an AAV2 random peptide plasmid library. Used as.
- Example 2 Preparation of AAV2 Random Peptide Virus Library (1) Seeding of AAV293 cells After recovering cultured AAV293 cells (manufactured by Stratage), 5 with DMEM (manufactured by Sigma) containing 10% FBS and 2 mM sodium L-glutamate. Suspended to x10 4 cells / mL. 40 mL of a solution containing AAV293 cells was added to a T225 cm 2 flask (manufactured by Corning Inc.) for cell culture, and the cells were cultured in a CO 2 incubator at 37 ° C. for 72 hours.
- DMEM manufactured by Sigma
- Example 2 (2) Transfection of plasmid into AAV293 cells AAV2WG-RPL / pUC118Sx 400 ng and pHELP (manufactured by cellbiolabs) obtained in Example 1 were transfected into AAV293 cells by 40 ⁇ g each using a general calcium phosphate method. Six hours after transfection, the medium was completely removed, 40 mL of DMEM containing 2% FBS and 2 mM sodium L-glutamate was added, and the cells were cultured in a CO 2 incubator at 37 ° C. for 48 hours.
- DMEM containing 2% FBS and 2 mM sodium L-glutamate
- AAV2 Random Peptide Virus Library 0.5 mL of 0.5 M EDTA was added to 2 flasks of T225 cm in culture and allowed to stand for several minutes. Then, AAV293 cells were exfoliated by pipetting, collected in a 50 mL tube, centrifuged at 300 ⁇ g for 10 minutes, and the supernatant was removed. After resuspending the cells in 2 mL of TBS (Tris buffered saline) per flask, a series of treatments of ethanol / dry ice for 15 minutes, a water bath at 37 ° C for 15 minutes, and vortex for 1 minute were repeated 3 times. , AAV-Random peptide virus library containing cell lysate was collected.
- TBS Tris buffered saline
- Example 3 Purification of AAV2 random peptide virus library (1) Purification by cesium chloride density gradient centrifugation 1 In a 40 PA tube for ultracentrifugation (manufactured by Hitachi-KOKI), 4 mL of a cesium chloride solution prepared to have a specific gravity of 1.5 from the bottom, 4 mL of a cesium chloride solution prepared to have a specific gravity of 1.25, and Examples 2- (4) The AAV vector solution prepared in (1) was layered in the order of 28 mL, and centrifuged in an ultracentrifuge HIMAC (manufactured by HIMACHI-KOKI) at 25,000 rpm at 16 ° C. for 3 hours.
- HIMAC manufactured by HIMACHI-KOKI
- Example 3- (2) Desalination by dialysis Several fractions having high titers in Example 3- (2) were mixed and added to a Slide-A-lyzer dialysis cassette (manufactured by Pierce).
- the purified AAV solution was desalted by performing dialysis twice at 4 ° C. for 3 hours with 1 L of phosphate buffered saline (PBS) and overnight dialysis at 4 ° C. with 500 mL of PBS / 5% sorbitol solution. Then, the solution was recovered, sterilized with a 0.22 ⁇ m filter (manufactured by Millipore), and stored at ⁇ 80 ° C. until use.
- the titer of the purified AAV particles was quantified by the same method as in Example 2- (4).
- Example 4 Screening of AAV2 Random Peptide Library (1) Tail Vein Administration to Mice
- the purified AAV particles obtained in Example 3- (3) are 1.5 ⁇ 10 14 virus genome (VG) / kg. As a result, it was administered from the tail vein of BALB / c mice.
- the brain was collected 72 hours after administration, and genomic DNA was extracted using NucleoSpin (registered trademark) tissue (manufactured by Machray Nagel) (Round 1).
- PCR was carried out for 30 cycles with 98 ° C. for 10 seconds, 55 ° C. for 15 seconds, and 68 ° C. for 15 seconds as one cycle.
- DNA was purified from this reaction solution using Nucleospin extract II (manufactured by Machray Nagel) and cleaved with the restriction enzyme BglI. After electrophoresis, it was purified using Nucleospin extract II and recloned into AAV2WG-Cap-ScaI-S4 / pUC118Sx prepared in Example 1 using a DNA ligation kit ⁇ Mighty Mix>.
- Random Peptide Sequencing Sequencing of the AAV random peptide plasmid library at each screening stage (rounds 1 to 3) was performed.
- Tables 1 and 2 show the peptide sequences encoded by the clones accumulated in the brain in Rounds 2 and 3 and the number of occurrences.
- GSGVTWV SEQ ID NO: 15
- AHGYREP SEQ ID NO: 16
- EYGFREG SEQ ID NO: 17
- ETGHGWV SEQ ID NO: 18
- SEQ ID NOs: 63 to 110 which are sequences containing the sequence confirmed in Round 2 and spacers, are sequences that easily infect the brain.
- GGSGVTWVA SEQ ID NO: 63
- GAHGYREPA SEQ ID NO: 64
- GEYGFREGA SEQ ID NO: 65
- GETGHGWVA SEQ ID NO: 66
- Example 5 Directional evaluation of AAV vector having acquired peptide sequence
- the vector fragment thus obtained was ligated using a DNA ligation kit ⁇ Mighty Mix> (manufactured by Takara Bio Co., Ltd.), and helper plasmids pRC-GSGVTWV, pRC-AHGYREP, pRC-EYGFREG, pRC-ETGHGWV, pRC-GGGIGYV, And pRC-ERGVGWV were obtained.
- AAV2-LacZ capsid mutant pAAV-LacZ (manufactured by Takara Bio Inc.), pHELP and pRC helper plasmids (pRC-GSGVTWV, pRC-AHGYREP, pRC-EYGFREG) prepared in Example 5- (1).
- PRC-ETGHGWV, pRC-GGGIGYV, or pRC-ERGVGGWV was transfected into 293T cells seeded in a T225 cm 2 flask using PEIpro (manufactured by plasmid).
- a pRC2 vector carrying a wild-type capsid was transfected instead of the pRC helper plasmid having a peptide sequence and used as a control.
- Transfected 293T cells were cultured in a 37 ° C. CO 2 incubator for 72 hours.
- the supernatant containing AAV was collected from a T225 cm 2 flask, and AAV was affinity purified using AVB Sepharose (manufactured by GE Healthcare Japan).
- AAV purification solution was prepared by concentrating and purifying AAV by ultrafiltration.
- the titer of the AAV vector was quantified by the method shown in Example 2- (4).
- an AAV capsid protein mutant having a directivity to the brain or an amino acid sequence is provided by systemic administration, and a method for efficiently introducing a gene into the brain is provided.
- SEQ ID NO: 1 AAV2 capsid 586-591 coding sequence
- SEQ ID NO: 2 Converted AAV2 capsid coding sequence
- SEQ ID NO: 3 Ampicillin resistance gene before conversion
- SEQ ID NO: 4 Ampicillin resistance gene after conversion
- SEQ ID NO: 5 AAV2 rep gene before conversion
- SEQ ID NO: 6 AAV2 rep gene after conversion
- SEQ ID NO: 7 DNA sequence coding random peptide
- SEQ ID NO: 8 Primer for synthesizing double strand DNA
- SEQ ID NO: 10 Reverse primer for quantitation of AAV titer
- SEQ ID NO: 11 Forward primer1 for amplification of random peptide coding region
- SEQ ID NO: 12 Reverse primer1 for amplification of random peptide coding region
- SEQ ID NO: 13 Forward primer2 for amplification of random peptide coding region
- SEQ ID NO: 14
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Abstract
Description
[1]配列番号15~配列番号62からなる群より選択されるアミノ酸配列を含むペプチド、あるいは配列番号15~配列番号62からなる群より選択されるアミノ酸配列において1または数個のアミノ酸が置換、欠失、挿入および/または付加されたアミノ酸配列を含むペプチドを含有させたアデノ随伴ウイルス(AAV)キャプシドタンパク質変異体をコードする核酸、
[2]AAVキャプシドタンパク質がAAV2由来である[1]記載の核酸、
[3]AAV2のVP1のアミノ酸番号588番とアミノ酸番号589番との間の位置に前記ペプチドを含有させた[2]記載の核酸、
[4][1]~[3]のいずれか1項に記載の核酸を含む組換えDNA、
[5][1]~[3]のいずれか1項に記載の核酸又は[4]記載の組換えDNAを含む細胞、
[6]配列番号15~配列番号62からなる群より選択されるアミノ酸配列を含むペプチド、あるいは配列番号15~配列番号62からなる群より選択されるアミノ酸配列において1または数個のアミノ酸が置換、欠失、挿入および/または付加されたアミノ酸配列を含むペプチドを含有させたAAVキャプシドタンパク質変異体を含むAAV粒子、
[7]AAVキャプシドタンパク質がAAV2由来である[6]記載のAAV粒子、
[8]AAV2のVP1のアミノ酸番号588番とアミノ酸番号589番との間の位置に前記ペプチドを含有させた[7]記載のAAV粒子、
[9]配列番号15~配列番号62からなる群より選択されるアミノ酸配列を含むペプチド、あるいは配列番号15~配列番号62からなる群より選択されるアミノ酸配列において1もしくは数個のアミノ酸が置換、欠失、挿入および/または付加されたアミノ酸配列を含むペプチドを含有させたAAVキャプシドタンパク質変異体を含むAAV粒子を細胞に接触させる工程を含む、遺伝子導入細胞の製造方法、
[10]AAVキャプシドタンパク質がAAV2由来である[9]記載の方法、
[11]AAV2のVP1のアミノ酸番号588番とアミノ酸番号589番との間の位置に前記ペプチドを含有させた[10]記載の方法、に関する。
本発明の核酸は、配列番号15~配列番号62からなる群より選択されるアミノ酸配列を含むペプチド、あるいは配列番号15~配列番号62からなる群より選択されるアミノ酸配列において1または数個のアミノ酸が置換、欠失、挿入および/または付加されたアミノ酸配列を含むペプチドを含有させたAAVキャプシドタンパク質変異体をコードする核酸である。好適には、本発明の核酸は、配列番号15~配列番号62からなる群より選択されるアミノ酸配列を含むペプチドを含有させたAAVキャプシドタンパク質変異体をコードする核酸である。さらに好適には、本発明の核酸は、配列番号15、配列番号16、配列番号17、配列番号18、配列番号19及び配列番号20からなる群より選択されるアミノ酸配列を含むペプチド、あるいは配列番号15、配列番号16、配列番号17、配列番号18、配列番号19及び配列番号20からなる群より選択されるアミノ酸配列において1または数個のアミノ酸が置換、欠失、挿入および/または付加されたアミノ酸配列を含むペプチドを含有させたAAVキャプシドタンパク質変異体をコードする核酸である。上記配列番号で示されるアミノ酸配列において1または数個のアミノ酸が置換、欠失、挿入および/または付加されたアミノ酸配列を含むペプチドは、該ペプチドをAAVキャプシドタンパク質に含有させた場合に、上記配列番号で示されるアミノ酸配列を含むペプチドを含有させたAAVキャプシドタンパク質変異体の細胞指向性が維持されるペプチドである。すなわち、上記配列番号で示されるアミノ酸配列において置換、欠失、挿入および/または付加されるアミノ酸の数は、上記配列番号で示されるアミノ酸配列を含むペプチドが該ペプチドを含有するAAVキャプシドタンパク質変異体に与える細胞指向性が維持されるかぎり限定されず、例えば、置換、欠失および/または挿入の場合、例えば1~5個、好ましくは1~4個、さらに好ましくは1、2または3個であり、付加の場合、例えば1~9個、好ましくは1~8個、さらに好ましくは1~7個、さらに好ましくは1~6個、さらに好ましくは1~5個、さらに好ましくは1、2、3または4個であってもよい。
式I: X1X2GX3GWV;
式II: X4X5X6X7GWV;
式III: X8X9GX10X11WV;
式IV: X12X13GX14GX15V;
式V: X16X17GX18GWX19;または
式VI: X20X21GX22REX23
[式中、X1~X23はいずれかのアミノ酸残基であり、Gはグリシンを表し、Wはトリプトファンを表し、Vはバリンを表し、Rはアルギニンを表し、Eはグルタミン酸を表す。]
で示されるアミノ酸配列を含むペプチドであってもよい。好適には、式I(X1X2GX3GWV)中、X1はE(グルタミン酸)、G(グリシン)またはT(トレオニン)であり、X2はR(アルギニン)、T(トレオニン)、S(セリン)、N(アスパラギン)、E(グルタミン酸)またはD(アスパラギン酸)であり、X3はV(バリン)、H(ヒスチジン)、R、M(メチオニン)またはL(ロイシン)である。好適には、式II(X4X5X6X7GWV)中、X4はA(アラニン)またはEであり、X5はD、GまたはAであり、X6はK(リジン)、Q(グルタミン)またはNであり、X7はVまたはLである。好適には、式III(X8X9GX10X11WV)中、X8はA、EまたはGであり、X9はS、D、GまたはRであり、X10はT、M、DまたはVであり、X11はR、V、SまたはTである。好適には、式IV(X12X13GX14GX15V)中、X12はD、E、GまたはRであり、X13はA、G、DまたはVであり、X14はI、H、D、F(フェニルアラニン)、GまたはLであり、X15はY(チロシン)、F、R、GまたはVである。好適には、式V(X16X17GX18GWX19)中、X16はA、EまたはGであり、X17はG、RまたはSであり、X18はV、HまたはDであり、X19はT、G、K、I(イソロイシン)またはAである。好適には、式VI(X20X21GX22REX23)中、X20はEまたはAであり、X21はYまたはHであり、X22はFまたはYであり、X23はGまたはP(プロリン)である。
本発明はまた、本発明の核酸、具体的には前記(1)の組換えDNAを含む宿主細胞、例えば単離された宿主細胞を提供する。単離された細胞は、例えばインビトロで維持されている細胞株である。本発明の宿主細胞は、以下に説明するように本発明のAAV粒子の製造に有用である。本発明の宿主細胞がAAV粒子を製造するために使用される場合、これは「パッケージング細胞」又は「プロデューサー細胞」と称することがある。本発明の宿主細胞は、前記(1)記載の本発明の組換えDNAがゲノムに組み込まれても良く、AAVキャプシドタンパク質変異体を一過性に発現するように前記の組換えDNAが細胞内に保持されていても良い。
本発明のAAV粒子は、前記(1)に記載されるペプチドを含有させたAAVキャプシドタンパク質変異体を含むAAV粒子である。本発明のAAV粒子は、前記(2)に記載される宿主細胞により製造することができる。本発明のAAV粒子は、脳に指向性を有し、脳への遺伝子導入に有用である。脳には、神経細胞とグリア細胞(ミクログリア、オリゴデンドロサイト、アストロサイト)などの脳細胞が含まれる。本発明のAAV粒子により導入された遺伝子は、前記組織、器官及び細胞で強く発現される。
前記(3)により得られる本発明のAAV粒子は、遺伝子治療やその他の目的で、所望の異種ポリヌクレオチドの細胞への送達のために使用される。一般にAAV粒子は、インビボ又はインビトロのいずれかで細胞へ導入される。インビトロで導入する場合、生体より取得された細胞にAAV粒子を接触させることにより導入する。この細胞を生体に移植することもできる。細胞を生体に導入する場合は、薬学的組成物として製剤化し、筋肉内、静脈内、皮下及び腹腔内投与などの様々な技術を利用できる。インビボで形質導入する場合は、AAV粒子を薬学的組成物として製剤化し、一般に非経口投与する(例えば、筋肉内、皮下、腫瘍内、経皮、髄腔内などの投与経路により投与する)。AAV粒子を含む薬学的組成物は、薬剤として許容される担体、及び必要に応じて他の薬剤、医薬品、安定化剤、緩衝液、担体、アジュバント、希釈液などを含んでいてもよい。
AAV2のゲノムを搭載したプラスミドベクターpAV1(ATCC Number:37215)を汎用宿主(Distribution host)のEscherichia coli HB101より抽出した。抽出したプラスミドから制限酵素BglII(タカラバイオ社製)によりAAV2のゲノムDNA(約4.7kb)を切り出した。このゲノムDNAをpUC118 BamHI/BAP(タカラバイオ社製)に挿入し、得られたプラスミドDNAをAAV2WG/pUC118とした。
(1)AAV293細胞の播種
培養したAAV293細胞(Stratagene社製)を回収後、10%FBS及び2mM L-グルタミン酸ナトリウムを含むDMEM(シグマ社製)で5×104細胞/mLとなるように懸濁した。細胞培養用T225cm2フラスコ(コーニング社製)にAAV293細胞を含む溶液を40mL添加し、37℃のCO2インキュベーターで72時間培養した。
実施例1で得たAAV2WG-RPL/pUC118Sx 400ng及びpHELP(cellbiolabs社製)を40μgずつ、一般的なリン酸カルシウム法を用いてAAV293細胞にトランスフェクションした。トランスフェクションの6時間後、培地を完全に除去し、2%FBS及び2mM L-グルタミン酸ナトリウムを含むDMEM 40mLを添加し、37℃のCO2インキュベーターで48時間培養した。
培養中のT225cm2フラスコに、0.5M EDTAを0.5mL添加して数分間静置した。その後、ピペッティングでAAV293細胞を剥離させて50mLチューブに回収し、300×g、10分間遠心後、上清を除去した。フラスコ1枚あたり2mLのTBS(トリス緩衝生理食塩水)に細胞を再懸濁後、エタノール/ドライアイスで15分間、37℃のウォーターバスで15分間、ボルテックス1分間の一連の処理を3回繰り返し、AAV-ランダムペプチドウイルスライブラリーを含む細胞破砕液を回収した。この溶液に、TBS 1mLあたり、1M MgCl2を5μL、Benzonase(登録商標)ヌクレアーゼ(メルク社製)を終濃度200U/mLとなるように添加し、37℃で30分間反応させた。その後、0.5M EDTAをTBS 1mLあたり6.5μL添加して反応を停止させた。この細胞破砕液を10000rpm、4℃、10分間遠心後、上清を回収しAAVベクター溶液とした。
AAVベクター溶液2μLに、10×DNaseIバッファー2μL、注射用水(大塚製薬社製)15.2μL、DNaseI(タカラバイオ社製)0.8μLを添加し、37℃で1時間インキュベートし、遊離のゲノムDNAやプラスミドDNAを除去した。DNaseIを不活化するために99℃、10分間の熱処理後、注射用水15μL、10×ProKバッファー[0.1M Tris-HCl (pH7.8)、0.1M EDTA、5% SDS]4μL、Proteinase K(タカラバイオ社製)1μLを添加し、55℃で1時間インキュベートした。その後、Proteinase Kを不活化するために95℃10分間処理した。このサンプルに対し、SYBR(登録商標) Premix ExTaq2(タカラバイオ社製)及びプライマー(配列番号9及び配列番号10)を用いて、キットに添付の説明書に従いAAVの力価定量を行った。なおサンプルは、注射用水で50倍希釈した溶液を2μL用いた。また、標準品として、pAV1を制限酵素で消化し、線状化したDNAを用いた。
(1)塩化セシウム密度勾配遠心分離による精製1
超遠心用の40PAチューブ(HITACHI-KOKI社製)に、底から比重1.5に調製した塩化セシウム溶液を4mL、比重1.25に調製した塩化セシウム溶液を4mL、実施例2-(4)で調製したAAVベクター溶液を28mLの順に重層し、超遠心機HIMAC(HITACHI-KOKI社製)で25000rpm、16℃、3時間遠心した。遠心後、上から28mLの溶液を除き、続いて上から0.7mLずつ溶液を採取して1.5mLチューブにそれぞれ回収した。実施例2-(4)と同様の方法で、各回収液に含まれるAAV粒子の力価を定量した。
実施例3-(1)で力価の高かった数フラクションに、比重1.39に調製した塩化セシウム溶液を加えて、10.5mLにフィルアップした。この溶液を超遠心用13PAチューブ(HITACHI-KOKI社製)に添加し、超遠心機で38000rpm、18℃、16時間遠心した。遠心後、チューブの上から順に0.7mLずつ採取して内容液を回収した。各回収液のAAV粒子の力価を実施例2-(4)と同様の方法で定量した。
実施例3-(2)で力価の高かった数フラクションを混合し、Slide-A-lyzer透析カセット(Pierce社製)に添加した。リン酸緩衝生理食塩水(PBS)1Lにより4℃で3時間の透析を2回、PBS/5%ソルビトール溶液500mLにより4℃で一晩透析を行うことで精製AAV溶液の脱塩を行った。その後、溶液を回収し、0.22μmフィルター(ミリポア社製)で滅菌後、使用するまで-80℃で保存した。また別途、精製AAV粒子の力価を実施例2-(4)と同様の方法で定量した。
(1)マウスへの尾静脈投与
実施例3-(3)で得られた精製AAV粒子を、1.5×1014ウイルスゲノム(VG)/kgとなるように、BALB/cマウスの尾静脈から投与した。投与72時間後に脳を回収し、NucleoSpin(登録商標) tissue(マッハライ・ナーゲル社製)を用いてゲノムDNAを抽出した(ラウンド1)。
実施例4-(1)で抽出したゲノムDNAを鋳型とし、PrimeSTAR(登録商標) GXL DNA polymerase(タカラバイオ社製)を用いてランダムペプチド配列をコードするDNAを増幅した。プライマーはフォワードプライマー1(配列番号11)及びリバースプライマー1(配列番号12)を用いた。PCRを98℃10秒、55℃15秒、68℃40秒を1サイクルとして30サイクル繰り返した。続いて、この反応液の1/25量を用いてフォワードプライマー2(配列番号13)及びリバースプライマー2(配列番号14)を用いて同量の反応液を調製した。PCRを98℃10秒、55℃15秒、68℃15秒を1サイクルとして30サイクル実施した。この反応液からNucleospin extract II(マッハライ・ナーゲル社製)を用いてDNAを精製し、制限酵素BglIを用いて切断した。電気泳動後、Nucleospin extract IIを用いて精製し、DNA ligation kit<Mighty Mix>を用いて、実施例1で調製したAAV2WG-Cap-ScaI-S4/pUC118Sxにリクローニングした。
実施例4-(2)で得たプラスミドを使用し、実施例2及び実施例3と同様の方法で、AAV2ランダムペプチドウイルスライブラリーの製造とAAV粒子の精製を行った。
実施例4-(1)と同様の方法でスクリーニング(マウスへのAAV粒子の投与と脳の回収)を行い、ゲノムDNAを抽出した(ラウンド2)。さらに、抽出したゲノムDNAを使用して、再度リクリーニング、ライブラリー製造と精製及びスクリーニングを行いゲノムDNAを抽出した(ラウンド3)。
各スクリーニング段階(ラウンド1~ラウンド3)のAAVランダムペプチドプラスミドライブラリーのシークエンシングを行った。そのうちラウンド2およびラウンド3に脳へ集積したクローンがコードするペプチド配列と出現回数を表1及び表2に示す。
(1)取得ペプチド配列をもつpRCヘルパープラスミドの構築
実施例4-(5)で得られたペプチド配列(配列番号15~20)を持つAAV2WG-Cap-ScaI-S4/pUC118Sxクローンを制限酵素SnaBI(タカラバイオ社製)及びHindIII(タカラバイオ社製)で消化して得た断片と、pAAVRC2ベクター(CELL BIOLABS社製)をSnaBI及びHindIIIで消化して得たベクター断片とを、DNA ligation kit<Mighty Mix>(タカラバイオ社製)を用いて連結し、ヘルパープラスミドpRC-GSGVTWV、pRC-AHGYREP、pRC-EYGFREG、pRC-ETGHGWV、pRC-GGGIGYV、及びpRC-ERGVGWVを得た。
pAAV-LacZ(タカラバイオ社製)、pHELP及び実施例5-(1)で調製したpRCヘルパープラスミド(pRC-GSGVTWV、pRC-AHGYREP、pRC-EYGFREG、pRC-ETGHGWV、pRC-GGGIGYV、又はpRC-ERGVGWV)を、PEIpro(Polyplus社製)を用いて、T225cm2フラスコに播種しておいた293T細胞にトランスフェクションした。なお、ペプチド配列をもつpRCヘルパープラスミドの代わりに野生型キャプシドを搭載したpRC2ベクターをトランスフェクションし、対照とした。トランスフェクションされた293T細胞を、37℃のCO2インキュベーターで72時間培養した。T225cm2フラスコからAAVを含む上清を回収し、AVBセファロース(GEヘルスケア社製)を用いてAAVをアフィニティ精製した。その後、限外ろ過によりAAVを濃縮精製することでAAV精製溶液を調製した。その後、実施例2-(4)に示した方法で、AAVベクターの力価を定量した。
実施例5-(2)で得たAAV精製溶液を0.22μmフィルターろ過を行った後に、マウス一匹当たり0.5×1011VG/マウスとなるように、マウス尾静脈から投与した。
実施例5-(3)でAAVを投与したマウスを、4週間後に安楽死させ、各組織を回収した。NucleoSpin tissue(マッハライ・ナーゲル社製)を用いて、各組織からゲノムDNAを抽出した。抽出したゲノムDNAをサンプルとしてリアルタイムPCRを実施し、各組織中に含まれるAAVベクターゲノム量を定量した。各組織中の全ゲノムDNA1μg当たりのAAVゲノムDNAの分子数を図2に示す。
SEQ ID NO:2: Converted AAV2 capsid coding sequence
SEQ ID NO:3: Ampicillin resistance gene before conversion
SEQ ID NO:4: Ampicillin resistance gene after conversion
SEQ ID NO:5: AAV2 rep gene before conversion
SEQ ID NO:6: AAV2 rep gene after conversion
SEQ ID NO:7: DNA sequence coding random peptide
SEQ ID NO:8: Primer for synthesizing double strand DNA
SEQ ID NO:9: Forward primer for quantitation of AAV titer
SEQ ID NO:10: Reverse primer for quantitation of AAV titer
SEQ ID NO:11: Forward primer1 for amplification of random peptide coding region
SEQ ID NO:12: Reverse primer1 for amplification of random peptide coding region
SEQ ID NO:13: Forward primer2 for amplification of random peptide coding region
SEQ ID NO:14: Reverse primer2 for amplification of random peptide coding region
SEQ ID NO:15: Peptide sequence GSGVTWV for AAV capsid protein mutant
SEQ ID NO:16: Peptide sequence AHGYREP for AAV capsid protein mutant
SEQ ID NO:17: Peptide sequence EYGFREG for AAV capsid protein mutant
SEQ ID NO:18: Peptide sequence ETGHGWV for AAV capsid protein mutant
SEQ ID NO:19: Peptide sequence GGGIGYV for AAV capsid protein mutant
SEQ ID NO:20: Peptide sequence ERGVGWV for AAV capsid protein mutant
SEQ ID NO:21: Peptide sequence ENGVGWV for AAV capsid protein mutant
SEQ ID NO:22: Peptide sequence GSGVGWV for AAV capsid protein mutant
SEQ ID NO:23: Peptide sequence ADGITWG for AAV capsid protein mutant
SEQ ID NO:24: Peptide sequence ADGTRWV for AAV capsid protein mutant
SEQ ID NO:25: Peptide sequence ADKVGWV for AAV capsid protein mutant
SEQ ID NO:26: Peptide sequence AGGVGWT for AAV capsid protein mutant
SEQ ID NO:27: Peptide sequence AGGVTGV for AAV capsid protein mutant
SEQ ID NO:28: Peptide sequence AGNAGGM for AAV capsid protein mutant
SEQ ID NO:29: Peptide sequence AGQLGWV for AAV capsid protein mutant
SEQ ID NO:30: Peptide sequence ARGTEWE for AAV capsid protein mutant
SEQ ID NO:31: Peptide sequence DAGHGFV for AAV capsid protein mutant
SEQ ID NO:32: Peptide sequence EANVGWV for AAV capsid protein mutant
SEQ ID NO:33: Peptide sequence ECGLGEG for AAV capsid protein mutant
SEQ ID NO:34: Peptide sequence EGEVTWL for AAV capsid protein mutant
SEQ ID NO:35: Peptide sequence EGGDGRV for AAV capsid protein mutant
SEQ ID NO:36: Peptide sequence EGGFGEA for AAV capsid protein mutant
SEQ ID NO:37: Peptide sequence EGGG for AAV capsid protein mutant
SEQ ID NO:38: Peptide sequence EGGMVWV for AAV capsid protein mutant
SEQ ID NO:39: Peptide sequence EGGVGWT for AAV capsid protein mutant
SEQ ID NO:40: Peptide sequence EGGVMWL for AAV capsid protein mutant
SEQ ID NO:41: Peptide sequence EGQVTWL for AAV capsid protein mutant
SEQ ID NO:42: Peptide sequence ERGHGWG for AAV capsid protein mutant
SEQ ID NO:43: Peptide sequence ESGVGWK for AAV capsid protein mutant
SEQ ID NO:44: Peptide sequence GDGFGGV for AAV capsid protein mutant
SEQ ID NO:45: Peptide sequence GDGVTWA for AAV capsid protein mutant
SEQ ID NO:46: Peptide sequence GEGRGWV for AAV capsid protein mutant
SEQ ID NO:47: Peptide sequence GGGDGWI for AAV capsid protein mutant
SEQ ID NO:48: Peptide sequence GGGDSWV for AAV capsid protein mutant
SEQ ID NO:49: Peptide sequence GGGIAWVAQAAL for AAV capsid protein mutant
SEQ ID NO:50: Peptide sequence GGGVGWA for AAV capsid protein mutant
SEQ ID NO:51: Peptide sequence GKGQVME for AAV capsid protein mutant
SEQ ID NO:52: Peptide sequence GNGTGGG for AAV capsid protein mutant
SEQ ID NO:53: Peptide sequence GQGGHME for AAV capsid protein mutant
SEQ ID NO:54: Peptide sequence GRGVTWV for AAV capsid protein mutant
SEQ ID NO:55: Peptide sequence GSGMGWV for AAV capsid protein mutant
SEQ ID NO:56: Peptide sequence GVGGGVV for AAV capsid protein mutant
SEQ ID NO:57: Peptide sequence NDVRGRV for AAV capsid protein mutant
SEQ ID NO:58: Peptide sequence RDGLGFV for AAV capsid protein mutant
SEQ ID NO:59: Peptide sequence TDGLGWV for AAV capsid protein mutant
SEQ ID NO:60: Peptide sequence TEGHGWV for AAV capsid protein mutant
SEQ ID NO:61: Peptide sequence VAERLYG for AAV capsid protein mutant
SEQ ID NO:62: Peptide sequence VARGAGE for AAV capsid protein mutant
SEQ ID NO:63: Peptide sequence GGSGVTWVA for AAV capsid protein mutant
SEQ ID NO:64: Peptide sequence GAHGYREPA for AAV capsid protein mutant
SEQ ID NO:65: Peptide sequence GEYGFREGA for AAV capsid protein mutant
SEQ ID NO:66: Peptide sequence GETGHGWVA for AAV capsid protein mutant
SEQ ID NO:67: Peptide sequence GGGGIGYVA for AAV capsid protein mutant
SEQ ID NO:68: Peptide sequence GERGVGWVA for AAV capsid protein mutant
SEQ ID NO:69: Peptide sequence GENGVGWVA for AAV capsid protein mutant
SEQ ID NO:70: Peptide sequence GGSGVGWVA for AAV capsid protein mutant
SEQ ID NO:71: Peptide sequence GADGITWGA for AAV capsid protein mutant
SEQ ID NO:72: Peptide sequence GADGTRWVA for AAV capsid protein mutant
SEQ ID NO:73: Peptide sequence GADKVGWVA for AAV capsid protein mutant
SEQ ID NO:74: Peptide sequence GAGGVGWTA for AAV capsid protein mutant
SEQ ID NO:75: Peptide sequence GAGGVTGVA for AAV capsid protein mutant
SEQ ID NO:76: Peptide sequence GAGNAGGMA for AAV capsid protein mutant
SEQ ID NO:77: Peptide sequence GAGQLGWVA for AAV capsid protein mutant
SEQ ID NO:78: Peptide sequence GARGTEWEA for AAV capsid protein mutant
SEQ ID NO:79: Peptide sequence GDAGHGFVA for AAV capsid protein mutant
SEQ ID NO:80: Peptide sequence GEANVGWVA for AAV capsid protein mutant
SEQ ID NO:81: Peptide sequence GECGLGEGA for AAV capsid protein mutant
SEQ ID NO:82: Peptide sequence GEGEVTWLA for AAV capsid protein mutant
SEQ ID NO:83: Peptide sequence GEGGDGRVA for AAV capsid protein mutant
SEQ ID NO:84: Peptide sequence GEGGFGEAA for AAV capsid protein mutant
SEQ ID NO:85: Peptide sequence GEGGGA for AAV capsid protein mutant
SEQ ID NO:86: Peptide sequence GEGGMVWVA for AAV capsid protein mutant
SEQ ID NO:87: Peptide sequence GEGGVGWTA for AAV capsid protein mutant
SEQ ID NO:88: Peptide sequence GEGGVMWLA for AAV capsid protein mutant
SEQ ID NO:89: Peptide sequence GEGQVTWLA for AAV capsid protein mutant
SEQ ID NO:90: Peptide sequence GERGHGWGA for AAV capsid protein mutant
SEQ ID NO:91: Peptide sequence GESGVGWKA for AAV capsid protein mutant
SEQ ID NO:92: Peptide sequence GGDGFGGVA for AAV capsid protein mutant
SEQ ID NO:93: Peptide sequence GGDGVTWAA for AAV capsid protein mutant
SEQ ID NO:94: Peptide sequence GGEGRGWVA for AAV capsid protein mutant
SEQ ID NO:95: Peptide sequence GGGGDGWIA for AAV capsid protein mutant
SEQ ID NO:96: Peptide sequence GGGGDSWVA for AAV capsid protein mutant
SEQ ID NO:97: Peptide sequence GGGGIAWVAQAALA for AAV capsid protein mutant
SEQ ID NO:98: Peptide sequence GGGGVGWAA for AAV capsid protein mutant
SEQ ID NO:99: Peptide sequence GGKGQVMEA for AAV capsid protein mutant
SEQ ID NO:100: Peptide sequence GGNGTGGGA for AAV capsid protein mutant
SEQ ID NO:101: Peptide sequence GGQGGHMEA for AAV capsid protein mutant
SEQ ID NO:102: Peptide sequence GGRGVTWVA for AAV capsid protein mutant
SEQ ID NO:103: Peptide sequence GGSGMGWVA for AAV capsid protein mutant
SEQ ID NO:104: Peptide sequence GGVGGGVVA for AAV capsid protein mutant
SEQ ID NO:105: Peptide sequence GNDVRGRVA for AAV capsid protein mutant
SEQ ID NO:106: Peptide sequence GRDGLGFVA for AAV capsid protein mutant
SEQ ID NO:107: Peptide sequence GTDGLGWVA for AAV capsid protein mutant
SEQ ID NO:108: Peptide sequence GTEGHGWVA for AAV capsid protein mutant
SEQ ID NO:109: Peptide sequence GVAERLYGA for AAV capsid protein mutant
SEQ ID NO:110: Peptide sequence GVARGAGEA for AAV capsid protein mutant
SEQ ID NO:111: Peptide sequence represented by Formula I
SEQ ID NO:112: Peptide sequence represented by Formula II
SEQ ID NO:113: Peptide sequence represented by Formula III
SEQ ID NO:114: Peptide sequence represented by Formula IV
SEQ ID NO:115: Peptide sequence represented by Formula V
SEQ ID NO:116: Peptide sequence represented by Formula VI
Claims (11)
- 配列番号15~配列番号62からなる群より選択されるアミノ酸配列を含むペプチド、あるいは配列番号15~配列番号62からなる群より選択されるアミノ酸配列において1または数個のアミノ酸が置換、欠失、挿入および/または付加されたアミノ酸配列を含むペプチドを含有させたアデノ随伴ウイルス(AAV)キャプシドタンパク質変異体をコードする核酸。
- AAVキャプシドタンパク質がAAV2由来である請求項1記載の核酸。
- AAV2のVP1のアミノ酸番号588番とアミノ酸番号589番との間の位置に前記ペプチドを含有させた請求項2記載の核酸。
- 請求項1~3のいずれか1項に記載の核酸を含む組換えDNA。
- 請求項1~3のいずれか1項に記載の核酸又は請求項4記載の組換えDNAを含む細胞。
- 配列番号15~配列番号62からなる群より選択されるアミノ酸配列を含むペプチド、あるいは配列番号15~配列番号62からなる群より選択されるアミノ酸配列において1または数個のアミノ酸が置換、欠失、挿入および/または付加されたアミノ酸配列を含むペプチドを含有させたAAVキャプシドタンパク質変異体を含むAAV粒子。
- AAVキャプシドタンパク質がAAV2由来である請求項6記載のAAV粒子。
- AAV2のVP1のアミノ酸番号588番とアミノ酸番号589番との間の位置に前記ペプチドを含有させた請求項7記載のAAV粒子。
- 配列番号15~配列番号62からなる群より選択されるアミノ酸配列を含むペプチド、あるいは配列番号15~配列番号62からなる群より選択されるアミノ酸配列において1または数個のアミノ酸が置換、欠失、挿入および/または付加されたアミノ酸配列を含むペプチドを含有させたAAVキャプシドタンパク質変異体を含むAAV粒子を細胞に接触させる工程を含む、遺伝子導入細胞の製造方法。
- AAVキャプシドタンパク質がAAV2由来である請求項9記載の方法。
- AAV2のVP1のアミノ酸番号588番とアミノ酸番号589番との間の位置に前記ペプチドを含有させた請求項10記載の方法。
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CN202080030827.0A CN113748122A (zh) | 2019-04-24 | 2020-04-23 | 具有脑靶向特性的aav突变体 |
JP2021516202A JP7524166B2 (ja) | 2019-04-24 | 2020-04-23 | 脳に指向性を有するaav変異体 |
EP20795029.6A EP3960755A4 (en) | 2019-04-24 | 2020-04-23 | AAV MUTANT WITH BRAIN TARGETING PROPERTIES |
AU2020263757A AU2020263757A1 (en) | 2019-04-24 | 2020-04-23 | AAV mutant having brain-targeting property |
BR112021017603A BR112021017603A2 (pt) | 2019-04-24 | 2020-04-23 | Vírus adenoassociado (aav) mutante tendo propriedade de direcionamento para o cérebro |
US17/442,386 US20220162637A1 (en) | 2019-04-24 | 2020-04-23 | Aav mutant having brain-targeting property |
CA3132447A CA3132447A1 (en) | 2019-04-24 | 2020-04-23 | Aav mutant having brain-targeting property |
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CN115960177B (zh) * | 2022-10-09 | 2023-07-07 | 广州派真生物技术有限公司 | 腺相关病毒突变体及其应用 |
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EP3960755A4 (en) | 2023-11-22 |
CN113748122A (zh) | 2021-12-03 |
IL286212A (en) | 2021-10-31 |
CA3132447A1 (en) | 2020-10-29 |
JPWO2020218419A1 (ja) | 2020-10-29 |
EP3960755A1 (en) | 2022-03-02 |
BR112021017603A2 (pt) | 2021-11-16 |
US20220162637A1 (en) | 2022-05-26 |
KR20220004072A (ko) | 2022-01-11 |
JP7524166B2 (ja) | 2024-07-29 |
AU2020263757A1 (en) | 2021-10-14 |
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