WO2016183298A2 - Nuclease-mediated regulation of gene expression - Google Patents
Nuclease-mediated regulation of gene expression Download PDFInfo
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Classifications
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- A61P7/00—Drugs for disorders of the blood or the extracellular fluid
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/46—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
- C12N5/06—Animal cells or tissues; Human cells or tissues
- C12N5/0602—Vertebrate cells
- C12N5/0634—Cells from the blood or the immune system
- C12N5/0647—Haematopoietic stem cells; Uncommitted or multipotent progenitors
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/14—Hydrolases (3)
- C12N9/16—Hydrolases (3) acting on ester bonds (3.1)
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- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2501/00—Active agents used in cell culture processes, e.g. differentation
- C12N2501/20—Cytokines; Chemokines
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2510/00—Genetically modified cells
Definitions
- the present disclosure is in the field of genome engineering, particularly targeted modification of the genome of a hematopoietic cell.
- Enhancer elements were first identified in the SV40 viral genome, and then found in the human immunoglobulin heavy chain locus. Now known to play regulatory roles in the expression of many genes, enhancers appear to mainly influence temporal and spatial patterns of gene expression. It has also been found that enhancers function in a manner that is not dependent upon distance from the core promoter of a gene, and is not dependent on any specific sequence orientation with respect to the promoter. Enhancers can be located several hundred kilobases upstream or downstream of a core promoter region, where they can be located in an intron sequence, or even beyond the 3' end of a gene. [0005] Various methods and compositions for targeted cleavage of genomic DNA
- targeted cleavage events can be used, for example, to induce targeted mutagenesis, induce targeted deletions of cellular DNA sequences, and facilitate targeted recombination at a predetermined chromosomal locus. See, e.g., U.S. Patent Nos 9,255,250; 9,200,266; 9,045,763; 9,005,973; 9,150,847;
- DSB double strand break
- HDR homology directed repair
- Cleavage can occur through the use of specific nucleases such as engineered zinc finger nucleases (ZFN), transcription- activator like effector nucleases (TALENs), or using the CRISPR/Cas system with an engineered crRNA/tracr RNA ('single guide RNA') to guide specific cleavage.
- specific nucleases such as engineered zinc finger nucleases (ZFN), transcription- activator like effector nucleases (TALENs), or using the CRISPR/Cas system with an engineered crRNA/tracr RNA ('single guide RNA') to guide specific cleavage.
- targeted nucleases are being developed based on the Argonaute system (e.g., from T. thermophilics, known as 'TtAgo', see Swarts et al (2014) Nature 507(7491): 258-261), which also may have the potential for uses in genome editing and gene therapy.
- the Argonaute system e.g., from T. thermophilics, known as 'TtAgo', see Swarts et al (2014) Nature 507(7491): 258-261
- Red blood cells or erythrocytes
- RBCs are the major cellular component of blood.
- RBCs account for one quarter of the cells in a human.
- Mature RBCs lack a nucleus and many other organelles in humans, and are full of hemoglobin, a metalloprotein that functions to carry oxygen to the tissues as well as carry carbon dioxide out of the tissues and back to the lungs for removal. This protein makes up approximately 97% of the dry weight of RBCs and it increases the oxygen carrying ability of blood by about seventy fold.
- Hemoglobin is a heterotetramer comprising two alpha (a)-like globin chains and two beta (P)-like globin chains and 4 heme groups.
- Hemoglobin A In adults the ⁇ 2 ⁇ 2 tetramer is referred to as Hemoglobin A (HbA) or adult hemoglobin.
- HbA Hemoglobin A
- the alpha and beta globin chains are synthesized in an approximate 1 : 1 ratio and this ratio seems to be critical in terms of hemoglobin and RBC stabilization.
- fetal hemoglobin HbF
- HbF fetal hemoglobin
- HPG1 also referred to as Ggamma
- HPG2 HPG2
- Fetal hemoglobin protein also contains two a globin chains, but in place of the adult ⁇ -globin chains, it has two fetal gamma (y)-globin chains (i.e., fetal hemoglobin is ⁇ 2 ⁇ 2).
- y fetal gamma
- hemoglobin The regulation of the switch from production of gamma- to beta-globin is quite complex, and primarily involves a down-regulation of gamma globin transcription with a simultaneous up-regulation of beta globin transcription.
- hemoglobinopathies genetic defects in the sequences encoding the hemoglobin chains can be responsible for a number of diseases known as hemoglobinopathies, including sickle cell anemia and thalassemias. In the majority of patients with hemoglobinopathies, including sickle cell anemia and thalassemias. In the majority of patients with hemoglobinopathies, including sickle cell anemia and thalassemias. In the majority of patients with hemoglobinopathies, including sickle cell anemia and thalassemias. In the majority of patients with sickle cell anemia and thalassemias. In the majority of patients with sickle cell anemia and thalassemias. In the majority of patients with sickle cell anemia and thalassemias. In the majority of patients with sickle cell anemia and thalassemias. In the majority of patients with sickle cell anemia and thalassemias. In the majority of patients with sickle cell anemia and thalassemias. In the majority of patients with sickle cell anemia and
- hemoglobinopathies the genes encoding gamma globin remain present, but expression is relatively low due to normal gene repression occurring around parturition as described above.
- Sickle cell disease is caused by a mutation in the ⁇ globin gene as a consequence of which valine is substituted for glutamic acid at amino acid #6 (a GAG to GTG at the DNA level), where the resultant hemoglobin is referred to as "hemoglobinS" or "HbS.”
- hemoglobinS a GAG to GTG at the DNA level
- HbS hemoglobinS
- a conformational shift in the deoxy form of HbS exposes a hydrophobic patch on the protein between the E and F helices.
- the hydrophobic residues of the valine at position 6 of the beta chain in hemoglobin are able to associate with the hydrophobic patch, causing HbS molecules to aggregate and form fibrous precipitates.
- Thalassemias are also diseases relating to hemoglobin and typically involve a reduced expression of globin chains. This can occur through mutations in the regulatory regions of the genes or from a mutation in a globin coding sequence that results in reduced expression or reduced levels or functional globin protein.
- Alpha thalassemias are mainly associated with people of Western Africa and South Asian descent, and may confer malarial resistance.
- Beta thalassemia is mainly associated with people of Mediterranean descent, typically from Greece and the coastal areas of Turkey and Italy. In thalassemia minor, only one of the ⁇ globin alleles bears a mutation. Individuals will suffer from microcytic anemia, and detection usually involves lower than normal mean corpuscular volume ( ⁇ 80fL).
- the alleles of subjects with thalassemia minor are ⁇ +/ ⁇ or ⁇ / ⁇ (where ' ⁇ +' refers to alleles that allow some amount of ⁇ chain formation to occur, ' ⁇ ' refers to wild type ⁇ globin alleles, and ' ⁇ ' refers to ⁇ globin mutations comprising some form of deletion).
- Thalassemia intermedia subject can often manage a normal life but may need occasional transfusions, especially at times of illness or pregnancy, depending on the severity of their anemia. These patients alleles can be ⁇ +/ ⁇ + or ⁇ / ⁇ +.
- Thalassemia major occurs when both alleles have thalassemia mutations. This is severely microcytic and hypochromic anemia.
- Treatment consists of periodic blood transfusion; splenectomy for splenomegaly and chelation of transfusion-caused iron overload. Bone marrow transplants are also being used for treatment of people with severe thalassemias if an appropriate donor can be identified, but this procedure can have significant risks.
- HbFH Fetal Hemoglobin'
- BCL11 A encodes a zinc finger protein that is thought to be involved in the developmental stage-specific regulation of gamma globin expression.
- BCLl 1 A is expressed in adult erythroid precursor cells and down-regulation of its expression leads to an increase in gamma globin expression.
- the splicing of the BCLl 1 A mRNA is developmentally regulated. In embryonic cells, it appears that the shorter BCLl 1 A mRNA variants, known as BCLl 1 A-S and
- BCLl 1 A-XS are primary expressed, while in adult cells, the longer BCLl 1 A-L and BCLl 1A-XL mRNA variants are predominantly expressed. See, Sankaran et a/ (2008) Science 322 p. 1839.
- the BCLl 1 A protein appears to interact with the beta globin locus to alter its conformation and thus its expression at different
- RNA targeted to the BCLl 1 A gene has been proposed ⁇ see, e.g., U.S. Patent Publication 20110182867) but this technology has several potential drawbacks, namely that complete knock down may not be achieved, delivery of such RNAs may be problematic and the RNAs must be present continuously, requiring multiple treatments for life.
- BCLl 1 A enhancer sequences provides a mechanism for increasing HbF. See, e.g., U.S. Patent Publication No. 20150132269. Genome wide association studies have identified a set of genetic variations at BCLl 1 A that are associated with increased HbF levels. These variations are a collection of SNPs found in non-coding regions of BCLl 1 A that function as a stage-specific, lineage-restricted enhancer region. Further investigation revealed that this BCLl 1 A enhancer is required in erythroid cells for BCLl 1 A expression, but is not required for its expression in B cells (see Bauer et al, (2013) Science 343 :253-257).
- the enhancer region was found within intron 2 of the BCLl 1 A gene, and three areas of DNAsel hypersensitivity (often indicative of a chromatin state that is associated with regulatory potential) in intron 2 were identified. These three areas were identified as “+62”, “+58” and “+55” in accordance with the distance in kilobases from the transcription start site of BCLl 1 A. These enhancer regions are roughly 350 (+55); 550 (+58); and 350 (+62) nucleotides in length (Bauer 2013, ibid).
- hemoglobinopathies such as sickle cell disease and beta thalassemia.
- the present invention describes compositions and methods for use in gene therapy and genome engineering. Specifically, the methods and compositions described relate to inactivating (e.g., by completely or partially abolishing its expression) a BCL1 1 A gene, for example a gene that acts as regulator of one or more additional genes.
- the invention describes methods and compositions for interfering with enhancer function in a BCL1 1 A gene to diminish or knock out its activity in specific cell lineages.
- the invention provides methods and compositions for interfering with BCL1 1 A enhancer functions wherein the enhancer sequences are not located within the BCL1 1 A gene. The resulting down-regulation of the BCL1 1 A gene in these circumstances in turn results in increased expression of gamma globin.
- the invention comprises a non-naturally occurring zinc finger protein comprising a zinc finger protein (ZFP) comprising 4, 5 or 6 fingers, each finger comprising a recognition helix region that recognizes a target subsite wherein the recognition helix regions comprise the sequences in the order shown in a single row of Table 1.
- ZFP zinc finger protein
- the ZFP comprises the recognition helixes as shown in Table 1 for the proteins designated as follows: 51446, 51463, 51484, 51856, 51857 or 51862 (which bind to the target site shown in SEQ ID NO: l) and 51536, 51949, 51990, 51993, 51979, 51982, 52015, 52032 (which bind to the target site shown in SEQ ID NO: 12).
- a zinc finger protein including the following recognition helix regions:
- F l STGNLTN (SEQ ID NO: 7);
- TSGSLTR SEQ ID NO:5
- F4 AQCCLFH (SEQ ID NO: 6); or
- F2 RPYTLRL (SEQ ID NO:3);
- TSGSLTR SEQ ID NO:5
- F6 AQCCLFH (SEQ ID NO: 6);
- TSGSLTR SEQ ID NO:5
- F6 AQCCLFH (SEQ ID NO: 6); or
- F2 QSGHLAR (SEQ ID NO: 14);
- F4 RHRDLSR (SEQ ID NO: 18);
- F2 QKAHLIR (SEQ ID NO:20);
- F4 RGRDLSR (SEQ ID NO:21) or LKRTLKR (SEQ ID NO:25);
- QRAHLTR SEQ ID NO:22
- F3 QKGTLGE (SEQ ID NO: 15) or QSGTRNH (SEQ ID NO:24);
- F2 QKAHLIR (SEQ ID NO:20);
- F3 QKGTLGE (SEQ ID NO: 15) or QSGTRNH (SEQ ID NO:24);
- F4 RGRDLSR (SEQ ID NO:21);
- F2 QSGHLAR (SEQ ID NO: 14);
- the zinc finger proteins as described herein are fused to a functional domain (e.g., transcriptional activation domain, transcriptional repression domain, cleavage domain (to form a zinc finger nuclease), etc.).
- a functional domain e.g., transcriptional activation domain, transcriptional repression domain, cleavage domain (to form a zinc finger nuclease), etc.
- Zinc finger nucleases may be used in dimerizing pairs to cleave at or near one or both of the target sites for the ZFNs of the pair, for example "left partners" of Table 1 (e.g., 51446, 51463, 51484, 51856, 51857, or 51862) can form dimers with the "right partners” of Table 1 (e.g., 51536, 51949, 51990, 51993, 51979, 51982, 52015, or 52032) to cleave BCL11 A enhancer sequences.
- “left partners” of Table 1 e.g., 51446, 51463, 51484, 51856, 51857, or 51862
- the "right partners” of Table 1 e.g., 51536, 51949, 51990, 51993, 51979, 51982, 52015, or 52032
- the invention comprises delivery of at least one nuclease (e.g., a nuclease that binds to a BCL11 A enhancer sequence) to a human stem cell or precursor cell (HSC/PC) for the purpose of genome engineering.
- the nuclease comprises a zinc finger protein (ZFP) comprising 4, 5 or 6 fingers, each finger comprising a recognition helix region that recognizes a target subsite wherein the recognition helix regions comprise the sequences in the order shown in a single row of Table 1.
- ZFP zinc finger protein
- the nuclease(s) as described herein may further comprise a linker (e.g., between the DNA-binding domain and the cleavage domain), for example a linker as shown in SEQ ID NOs:26-29 and U.S. Patent Publication No. 20150132269.
- a linker e.g., between the DNA-binding domain and the cleavage domain
- the nuclease is delivered as a peptide, while in others it is delivered as a nucleic acid encoding the at least one nuclease. In some embodiments, more than one nuclease is used.
- the nucleic acid encoding the nuclease is an mRNA, and in some instances, the mRNA is protected. In some aspects, the mRNA may be chemically modified (See e.g.
- the mRNA may comprise an ARCA cap (see U.S. Patents 7,074,596 and 8, 153,773).
- the mRNA may comprise a mixture of unmodified and modified nucleotides (see U.S. Patent Publication 2012/0195936).
- the nucleic acid encoding the nuclease(s) is delivered to the HSC/PC via electroporation.
- the nuclease cleaves at or near the binding site of transcription factor.
- the transcription factor is GATA-1.
- the invention comprises a cell or cell line in which an endogenous BCL11 A enhancer sequence is genetically modified by a nuclease as described herein (e.g., shown in Table 1), for example as compared to the wild-type sequence of the cell.
- Nuclease-modified cells or cell lines as described herein are distinguishable in structure and/or function from both wild-type and other modified (nuclease-mediated) cells.
- the genetically modified cell or cell lines may be heterozygous or homozygous for the modification.
- the modifications may comprise insertions (e.g., transgene insertion), deletions and/or combinations thereof.
- the insertions, deletions and/or combinations thereof result in the destruction of a transcription factor binding site.
- the modification is at or near the nuclease(s) binding and/or cleavage site(s), for example, within 1-300 (or any value therebetween) base pairs upstream or downstream of the site(s) of cleavage, more preferably within 1-100 base pairs (or any value
- the modification may also include modifications to one or more nucleotides in the cleavage and/or in one or more of the binding sites.
- one or more of the nuclease target site(s) is(are) not modified. In other embodiments, at least one of the target sites for the nuclease(s) is(are) modified.
- the modification is at or near the "+58" region of the BCL11 A enhancer, for example, at or near a nuclease binding site shown in any of SEQ ID NO: 1 and SEQ ID NO: 12.
- Any cell or cell line may be modified by the nucleases as described herein, for example a stem cell (hematopoietic stem cell such as a CD34+ hematopoietic stem cell) or red blood cell (RBC) precursor cell.
- stem cell hematopoietic stem cell such as a CD34+ hematopoietic stem cell
- RBC red blood cell
- cells or cell lines obtained following modification by a nuclease as described herein for example cells or cell lines descended from a nuclease-modified cell or cell line.
- Partially or fully differentiated cells descended from the modified stem cells as described herein are also provided (e.g., RBCs or RBC precursor cells).
- the cells descended from the nuclease-modified cells may be propagated (and/or differentiated) in vitro (culture) or may differentiate within a live subject, for example following ex vivo administration of a nuclease-modified stem cell.
- Any of the genetically modified cells or cell lines disclosed herein may show increased expression of gamma globin.
- Compositions such as pharmaceutical compositions comprising the genetically modified cells as described herein are also provided.
- the invention comprises delivery of a donor nucleic acid to a target cell to provide a genetically modified cell in which the donor is integrated into the cell.
- the donor may be delivered prior to, after, or along with the nucleic acid encoding the nuclease(s) of Table 1.
- the donor nucleic acid may comprise an exogenous sequence (transgene) to be integrated into the genome of the cell, for example, an endogenous locus.
- the donor may comprise a full length gene or fragment thereof flanked by regions of homology with the targeted cleavage site.
- the donor lacks homologous regions and is integrated into a target locus through homology independent mechanism (i.e. HEJ).
- the donor may comprise any nucleic acid sequence, for example a nucleic acid that, when used as a substrate for homology-directed repair of the nuclease- induced double-strand break, leads to a donor-specified deletion to be generated at the endogenous chromosomal locus (e.g., BCLl 1 A enhancer region) or, alternatively (or in addition to), novel allelic forms of (e.g., point mutations that ablate a transcription factor binding site) the endogenous locus to be created.
- the donor nucleic acid is an oligonucleotide wherein integration leads to a gene correction event, or a targeted del eti on .
- the nuclease and/or donor is(are) delivered by viral and/or non-viral gene transfer methods.
- the donor is delivered to the cell via an adeno-associated virus (AAV).
- AAV adeno-associated virus
- the AAV comprises LTRs that are of a heterologous serotype in comparison with the capsid serotype.
- deletions comprising regions within the DNAsel hypersensitive regions of the enhancer (e.g., the +58 region of the BCLl 1 A enhancer) are made using one or more nucleases as shown in Table 1. These deletions can comprise from about 1 nucleotide to about 551 nucleotides. Thus, the deletions can comprise, 1, 5, 10, 15, 20, 25, 30, 40, 50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550 nucleotides, or any value therebetween. In some embodiments, the deletions comprise binding regions for one or more transcription factors. In some preferred embodiments, the deletions comprise a GATA-1 binding site, or the binding site for GATA-1 in combination with other factors.
- the DNA binding domains of Table 1 are fused to a functional domain. Some aspects include fusion of the DNA binding domains with domains capable of regulating the expression of a gene. In some embodiments, the fusion proteins comprise the DNA binding domain of Table 1 fused to a gene expression modulatory domain where the modulator represses gene expression.
- the HSC/PC cells are contacted with the nucleases and/or DNA binding proteins of the invention (i.e., ZFPs as shown in Table 1).
- the nucleases and/or DNA binding proteins are delivered as nucleic acids and in other embodiments, they are delivered as proteins.
- the nucleic acids are mRNAs encoding the nucleases and/or DNA binding proteins, and in further embodiments, the mRNAs may be protected.
- the mRNA may be chemically modified, may comprise an ARCA cap and/or may comprise a mixture of unmodified and modified nucleotides. Cells or cell lines descended from these cells are also provided, including partially or fully differentiated cells.
- the HSC/PC are contacted with the nucleases and/or
- DNA binding proteins of the invention ex vivo, following apheresis of the HSC/PC from a subject, or purification from harvested bone marrow.
- the nucleases described herein cause modifications within the BCL11 A enhancer regions, for example resulting a genetically modified cell that is structurally and/or functionally distinct from wild-type and/or other modified (e.g., nuclease-modified) cells.
- the HSC/PC containing the BCL11 A enhancer region modifications are introduced back into the subject.
- the HSC/PC containing the BCL1 1 A enhancer region modifications are expanded prior to introduction.
- the genetically modified HSC/PCs are given to the subject in a bone marrow transplant wherein the HSC/PC engraft, differentiate and mature in vivo.
- the HSC/PC are isolated from the subject following G-CSF- and/or plerixafor-induced mobilization, and in others, the cells are isolated from human bone marrow or human umbilical cords.
- the subject is treated to a mild myeloablative procedure prior to introduction of the graft comprising the modified HSC/PC, while in other aspects, the subject is treated with a vigorous myeloablative conditioning regimen.
- the methods and compositions of the invention are used to treat or prevent a hemoglobinopathy.
- the hemoglobinopathy is a beta thalassemia, while in other aspects, the hemoglobinopathy is sickle cell disease.
- the HSC/PC are further contacted with a donor molecule.
- the donor molecule is delivered by a viral vector.
- the donor molecule may comprise one or more sequences encoding a functional polypeptide ⁇ e.g., a cDNA or fragment thereof), with or without a promoter.
- Additional sequences may be included when a donor molecule is used for inactivation, including but not limited to, sequences encoding a 2A peptide, SA site, IRES, etc.
- the methods and compositions of the invention comprise methods for contacting the HSC/PC in vivo.
- the nucleases and/or DNA binding proteins are delivered to HSC/PC in situ by methods known in the art.
- the nucleases and/or DNA binding proteins of the invention comprise a viral particle that is administered to the subject in need, while in others, the nucleases and/or DNA binding proteins comprise a nanoparticle ⁇ e.g. liposome).
- the viral particles and/or nanoparticles are delivered to the organ ⁇ e.g. bone marrow) wherein the HSC/PC reside.
- a donor nucleic acid into the genome of a cell via homology-independent mechanisms.
- the methods comprise creating a double-stranded break (DSB) in the genome of a cell and cleaving the donor molecule using a nuclease as described herein, such that the donor nucleic acid is integrated at the site of the DSB.
- the donor nucleic acid is integrated via non-homology dependent methods ⁇ e.g., NHEJ).
- NHEJ non-homology dependent methods
- the donor sequence can include one or more of the same target sites for one or more of the nucleases used to create the DSB.
- the donor sequence may be cleaved by one or more of the same nucleases used to cleave the endogenous gene into which integration is desired.
- the donor sequence includes different nuclease target sites from the nucleases used to induce the DSB.
- DSBs in the genome of the target cell may be created by any mechanism.
- the DSB is created by one or more zinc-finger nucleases (ZFNs), fusion proteins comprising a zinc finger binding domain, which is engineered to bind a sequence within the region of interest, and a cleavage domain or a cleavage half-domain.
- ZFNs zinc-finger nucleases
- fusion proteins comprising a zinc finger binding domain, which is engineered to bind a sequence within the region of interest, and a cleavage domain or a cleavage half-domain.
- the donor may encode a regulatory protein of interest ⁇ e.g. ZFP TFs, TALE TFs or a CRISPR/Cas TF) that binds to and/or modulates expression of a gene of interest.
- a regulatory protein of interest e.g. ZFP TFs, TALE TFs or a CRISPR/Cas TF
- the regulatory proteins bind to a DNA sequence and prevent binding of other regulatory factors.
- the binding of the regulatory protein may modulate ⁇ i.e. induce or repress) expression of a target DNA.
- the transgenic HSC/PC cell and/or animal includes a transgene that encodes a human gene.
- the transgenic animal comprises a knock out at the endogenous locus corresponding to exogenous transgene, thereby allowing the development of an in vivo system where the human protein may be studied in isolation.
- Such transgenic models may be used for screening purposes to identify small molecules or large biomolecules or other entities which may interact with or modify the human protein of interest.
- the transgene is integrated into the selected locus (e.g., safe-harbor) into a stem cell (e.g., an embryonic stem cell, an induced pluripotent stem cell, a hematopoietic stem cell, etc.) or animal embryo obtained by any of the methods described herein, and then the embryo is implanted such that a live animal is born. The animal is then raised to sexual maturity and allowed to produce offspring wherein at least some of the offspring comprise edited endogenous gene sequence or the integrated transgene.
- a stem cell e.g., an embryonic stem cell, an induced pluripotent stem cell, a hematopoietic stem cell, etc.
- animal embryo obtained by any of the methods described herein
- a method of altering gene expression comprising: introducing, into the cell, one or more nucleases as described herein (shown in Table 1), under conditions such that the one or more proteins are expressed and expression of the gene is altered.
- expression of a globin gene e.g., gamma globin or beta globin
- is altered e.g., increased.
- any of the methods described herein may further comprise integrating a donor sequence (e.g., transgene or fragment thereof under the control of an exogenous or endogenous promoter) into the genome of the cell, for example integrating a donor at or near the site of nuclease cleavage in the BCL1 1 A gene.
- the donor sequence is introduced to the cell using a viral vector, as an oligonucleotide and/or on a plasmid.
- the cell in which gene expression is altered may be, for example, a red blood cell (RBC) precursor cell and/or a hematopoietic stem cell (e.g., CD34+ cell).
- RBC red blood cell
- CD34+ cell hematopoietic stem cell
- a method of producing a genetically modified cell comprising a genomic modification within an endogenous BCL1 1 A enhancer sequence (a modification to the nucleotide sequence of the BCL1 1 A enhancer sequence), the method comprising the steps of: a) contacting a cell with a polynucleotide (e.g.
- DNA or mRNA encoding a zinc finger nuclease comprising 4, 5, or 6 zinc finger domains in which each of the zinc finger domains comprises a recognition helix region in the order shown in a single row of Table 1 ; b) subjecting the cell to conditions conducive to expressing the zinc finger protein from the polynucleotide; and c) modifying the endogenous BCL1 1 A enhancer sequence with the expressed zinc finger protein sufficient to produce the genetically modified cell.
- the cells are stimulated with at least one cytokine (e.g., prior to step (a)).
- the polynucleotide may be contacted with the cell using any suitable method, including but not limited, via transfection, using a non-viral vector, using a viral vector, by chemical means or by exposure to an electric field (e.g., electroporation).
- any suitable method including but not limited, via transfection, using a non-viral vector, using a viral vector, by chemical means or by exposure to an electric field (e.g., electroporation).
- Cells comprising one or a combination of the genomic modifications described herein are also provided, including cells descended from the cells produced by the methods described herein.
- the patient is known to have, is suspected of having, or is at risk of developing a thalassemia or sickle cell disease.
- kits comprising the nucleic acids, proteins and/or genetically modified cells of the invention.
- the kit may comprise nucleic acids encoding the nucleases, (e.g. RNA molecules or ZFN, TALEN or CRISPR/Cas system encoding genes contained in a suitable expression vector), or aliquots of the nuclease proteins, donor molecules, suitable sternness modifiers, cells, buffers, and/or instructions (e.g., for performing the methods of the invention) and the like.
- the invention includes, but is not limited to, a genetically modified cell (e.g., stem cell such as a hematopoietic (CD34+) stem cell or RBC precursor cell) comprising at least one genomic modification made by a nuclease (e.g., as shown in a single row of Table 1), wherein the genomic modification is within an endogenous BCL1 1 A enhancer sequence, and further wherein the genomic modification is selected from the group consisting of insertions, deletions and combinations thereof and comprises a modification at or near any of SEQ ID NO: 1 and SEQ ID NO: 12.
- the cell is a genetically modified differentiated cell descended from a stem cell as described herein (e.g., a RBC descended from a hematopoietic stem cell or RBC precursor cell).
- the nuclease may comprise at least one zinc finger nuclease (ZFN)
- the genomic modification comprises an insertion that comprises integration of a donor polynucleotide encoding a transgene.
- pharmaceutical compositions comprising one or more of the genetically modified cells as described herein.
- a DNA-binding protein comprising a zinc finger protein comprising 4, 5 or 6 zinc finger domains comprising a recognition helix region, wherein the zinc finger proteins comprise the recognition helix regions in the order shown in a single row of Table 1.
- TALE protein comprising a plurality of repeats that bind to a sequence comprising a portion (e.g., at least 4, 5, 6 or more) base pairs of the target sites shown in Table 1.
- a fusion protein comprising a zinc finger protein or TALE protein as described herein and a wild-type or engineered cleavage domain or cleavage half-domain is also provided as are polynucleotides encoding the proteins (ZFPs, TALEs, ZFNs, TALENs) as described herein.
- Cells e.g., isolated stem cells such as hematopoietic (CD34+) stem cells
- kits comprising one or more proteins, polynucleotides and/or cells as described herein.
- a method of altering globin gene expression in a cell comprising: introducing, into the cell, one or more polynucleotides encoding one or more nucleases as described herein, under conditions such that the one or more proteins are expressed and expression of the globin gene (e.g., gamma and/or beta globin) is altered (e.g., increased).
- the methods further comprise integrating a donor sequence into the genome of the cell, for example using a viral vector, as an oligonucleotide or on a plasmid.
- the donor sequence may comprise a transgene under the control of an endogenous or exogenous promoter.
- a method of producing a genetically modified cell comprising a genomic modification within an endogenous BCL1 1 A enhancer sequence (e.g., target site as shown in Table 1), the method comprising the steps of: (a) contacting a cell with a polynucleotide encoding a fusion protein comprising a zinc finger nuclease comprising 4, 5, or 6 zinc finger domains in which each of the zinc finger domains comprises a recognition helix region in the order shown in a single row of Table 1 ; (b) subjecting the cell to conditions conducive to expressing the fusion protein from the polynucleotide; and (c) modifying the endogenous
- the method further comprises stimulating the cells with at least one cytokine.
- the polynucleotide(s) may be delivered inside the cell, for example using a non-viral delivery system, a viral delivery system, and/or a delivery vehicle and may comprise subjecting the cells to an electric field.
- Methods of treating a patient in need of an increase in globin gene expression e.g., a patient is known to have, is suspected of having, or is at risk of developing a globinopathy such as a thalassemia (e.g., ⁇ -thalassemia) or sickle cell disease are also provided, the method comprising administering to the patient the pharmaceutical composition as described herein (e.g., proteins, polynucleotides and/or cells) in an amount sufficient to increase the globin gene expression in the patient.
- a pharmaceutical composition as described herein e.g., proteins, polynucleotides and/or cells
- Figure 1 is a graph depicting the relative ratio of human gamma globin expression (HBG) to human beta globin expression (HBB) in red blood cells derived from CD34+ cells edited with the BCL1 la-specific ZFN pairs shown.
- HBG human gamma globin expression
- HBB human beta globin expression
- Figures 2A and 2B are graphs depicting the activity of two pairs of
- BCL1 la specific ZFNs in CD34+ cells isolated from peripheral blood (PB). Cells were transfected using a BTX electroporation device. The % indels detected
- Figure 3 is a graph depicting the expression of human gamma globin
- HBG human beta globin
- Figure 4A and Figure 4B are graphs depicting the activity of two pairs of BCL1 la specific ZFNs in CD34+ cells isolated from bone marrow (BM). Cells were transfected using a BTX electroporation device. The % indels detected (measurement of detectable NHEJ activity) for each condition are shown below the graphs for Figure 4A (mRNA input range from 2.0 to 8.0 ⁇ g).
- Figure 4B depicts the activity of one pair of ZFNs where the ZFNs are supplied either as a single mRNA species with a 2a self- cleaving peptide sequence separating the sequences encoding each ZFN or when the two ZFNs are supplied on separate mRNAs.
- Figures 5A and 5B depicts activity of ZFN pairs in PB derived
- Figure 5A depicts a comparison between two ZFN pairs
- Figure 5B depicts the activity of the ZFNs pairs when the ZFNs are supplied either as a single mRNA species with a 2a self- cleaving peptide sequence separating the sequences encoding each ZFN or when the two ZFNs are supplied on separate mRNAs.
- Figure 6 depicts a graph showing large scale activity of the A pair
- mRNAs encoding the ZFN pairs were either supplied as single mRNAs where the sequences encoding each half of the ZFN pair were separated by a 2a self-cleaving sequence, or as separate mRNAs encoding each ZFN. Activity is shown in the % indels detected.
- Figure 7 shows a graph depicting the relative amount of FIBG and
- samples were tested either as single mRNAs encoding both ZFNs, or as separate mRNAs.
- the amount of indels detected at day 0 of differentiation is shown across the bottom, and demonstrates that indel activity tracks with the amount of HGB expressed.
- Figure 8 is a graph depicting the percent of indels detected in large scale editing of CD34+ cells from bone marrow treated with pair B, either as single mRNAs or separate mRNAs as described above.
- Figures 9A and 9B are graphs depicting the percent of indels detected in large scale editing of CD34+ cells from bone marrow treated with pair B, either as single mRNAs or separate mRNAs as described above.
- Figures 10A and 10B are tables depicting the results of the off-target analysis for Pair A ( Figure 10A) and Pair B ( Figure 10B).
- Figures 11A and 11B are graphs showing real-time RT qPCR analysis of in vitro differentiation in experiment 1 ( Figure 11 A) and experiment 2 ( Figure 1 IB) using patient and wild type (wt) cells treated with SB ZFN mRNA. The graphs show the relative ratios of gamma globin to alpha globin mRNAs.
- Figures 12A and 12B are graphs showing the ratios of gamma globin to alpha globin in experiment 1 ( Figure 12A) and experiment 2 ( Figure 12B). For the gamma globin values, the values of the Agamma and Ggamma peaks and, where applicable, the Agamma T peak were added up.
- Figure 13 shows a graph of the gamma/beta like protein ratios graphed according to the allele state in the individual colonies analyzed.
- the data were sorted by genotypic class ("+” for unmodified allele, "-" for edited allele; "+/+” for wild type; "+/-” for monoallelic modified; and "-/-” for biallelic modified).
- compositions and methods for genome engineering for the modulation of BCL11 A and/or gamma globin expression and for the treatment and/or prevention of hemoglobinopathies are disclosed herein.
- nucleases comprising the ZFPs having the recognition helix regions as shown in a single row of Table 1 is efficiently achieved in HSC/PC and results in a change in relative gamma globin expression during subsequent erythropoiesis.
- This modulation of BCL11 A and gamma globin expression is particularly useful for treatment of hemoglobinopathies (e.g., beta thalassemias, sickle cell disease) wherein there is insufficient beta globin expression or expression of a mutated form of beta-globin.
- the complications and disease related sequelae caused by the aberrant beta globin can be overcome by alteration of the expression of gamma globin in erythrocyte precursor cells.
- nucleic acid refers to a deoxyribonucleotide or ribonucleotide polymer, in linear or circular conformation, and in either single- or double-stranded form.
- polynucleotide refers to a deoxyribonucleotide or ribonucleotide polymer, in linear or circular conformation, and in either single- or double-stranded form.
- these terms are not to be construed as limiting with respect to the length of a polymer.
- the terms can encompass known analogues of natural nucleotides, as well as nucleotides that are modified in the base, sugar and/or phosphate moieties (e.g., phosphorothioate backbones).
- an analogue of a particular nucleotide has the same base-pairing specificity; i.e., an analogue of A will base-pair with T.
- amino acid polymers in which one or more amino acids are chemical analogues or modified derivatives of a corresponding naturally-occurring amino acids.
- Binding refers to a sequence-specific, non-covalent interaction between macromolecules (e.g., between a protein and a nucleic acid). Not all components of a binding interaction need be sequence-specific (e.g., contacts with phosphate residues in a DNA backbone), as long as the interaction as a whole is sequence-specific. Such interactions are generally characterized by a dissociation constant (K d ) of 10 "6 M "1 or lower. "Affinity” refers to the strength of binding:
- a "binding protein” is a protein that is able to bind to another molecule.
- a binding protein can bind to, for example, a DNA molecule (a DNA- binding protein), an RNA molecule (an RNA-binding protein) and/or a protein molecule (a protein-binding protein).
- a DNA-binding protein binds to DNA molecule
- RNA-binding protein an RNA-binding protein
- protein-binding protein binds to itself (to form homodimers, homotrimers, etc.) and/or it can bind to one or more molecules of a different protein or proteins.
- a binding protein can have more than one type of binding activity. For example, zinc finger proteins have DNA- binding, RNA-binding and protein-binding activity.
- a "zinc finger DNA binding protein” (or binding domain) is a protein, or a domain within a larger protein, that binds DNA in a sequence-specific manner through one or more zinc fingers, which are regions of amino acid sequence within the binding domain whose structure is stabilized through coordination of a zinc ion.
- zinc finger DNA binding protein is often abbreviated as zinc finger protein or ZFP.
- a "TALE DNA binding domain” or “TALE” is a polypeptide comprising one or more TALE repeat domains/units. The repeat domains are involved in binding of the TALE to its cognate target DNA sequence.
- a single “repeat unit” (also referred to as a “repeat”) is typically 33-35 amino acids in length and exhibits at least some sequence homology with other TALE repeat sequences within a naturally occurring TALE protein.
- Zinc finger and TALE binding domains can be "engineered” to bind to a predetermined nucleotide sequence, for example via engineering (altering one or more amino acids) of the recognition helix region of a naturally occurring zinc finger or TALE protein. Therefore, engineered DNA binding proteins (zinc fingers or
- TALEs are proteins that are non-naturally occurring.
- methods for engineering DNA-binding proteins are design and selection.
- a designed DNA binding protein is a protein not occurring in nature whose design/composition results principally from rational criteria. Rational criteria for design include
- a "selected" zinc finger protein or TALE is a protein not found in nature whose production results primarily from an empirical process such as phage display, interaction trap or hybrid selection. See e.g., U.S. Patent Nos. 5,789,538;
- TtAgo is a prokaryotic Argonaute protein thought to be involved in gene silencing.
- TtAgo is derived from the bacteria Thermus thermophilics. See, e.g., Swarts et al, ibid, G. Sheng et al, (2013) Proc. Natl. Acad. Sci. U.S.A. I l l, 652).
- a "TtAgo system” is all the components required including, for example, guide DNAs for cleavage by a TtAgo enzyme.
- homologous recombination refers to the specialized form of such exchange that takes place, for example, during repair of double-strand breaks in cells via homology-directed repair mechanisms. This process requires nucleotide sequence homology, uses a "donor” molecule to template repair of a "target” molecule (i.e., the one that experienced the double-strand break), and is variously known as “non-crossover gene conversion” or “short tract gene conversion,” because it leads to the transfer of genetic information from the donor to the target.
- such transfer can involve mismatch correction of heteroduplex DNA that forms between the broken target and the donor, and/or "synthesis-dependent strand annealing," in which the donor is used to resynthesize genetic information that will become part of the target, and/or related processes.
- Such specialized HR often results in an alteration of the sequence of the target molecule such that part or all of the sequence of the donor polynucleotide is incorporated into the target polynucleotide.
- one or more targeted nucleases as described herein create a double-stranded break (DSB) in the target sequence (e.g., cellular chromatin) at a predetermined site.
- the DSB may result in deletions and/or insertions by homology-directed repair or by non-homology-directed repair mechanisms.
- Deletions may include any number of base pairs.
- insertions may include any number of base pairs including, for example, integration of a
- donor polynucleotide optionally having homology to the nucleotide sequence in the region of the break.
- the donor sequence may be physically integrated or,
- the donor polynucleotide is used as a template for repair of the break via homologous recombination, resulting in the introduction of all or part of the nucleotide sequence as in the donor into the cellular chromatin.
- a first sequence in cellular chromatin can be altered and, in certain embodiments, can be converted into a sequence present in a donor polynucleotide.
- replace or “replacement” can be understood to represent replacement of one nucleotide sequence by another, (i.e., replacement of a sequence in the informational sense), and does not necessarily require physical or chemical replacement of one polynucleotide by another.
- additional pairs of zinc-finger proteins or TALEN can be used for additional double-stranded cleavage of additional target sites within the cell.
- Any of the methods described herein can be used for insertion of a donor of any size and/or partial or complete inactivation of one or more target sequences in a cell by targeted integration of donor sequence that disrupts expression of the gene(s) of interest.
- Cell lines with partially or completely inactivated genes are also provided.
- the exogenous nucleotide sequence can contain sequences that are homologous, but not identical, to genomic sequences in the region of interest, thereby stimulating homologous recombination to insert a non-identical sequence in the region of interest.
- portions of the donor sequence that are homologous to sequences in the region of interest exhibit between about 80 to 99% (or any integer therebetween) sequence identity to the genomic sequence that is replaced.
- the homology between the donor and genomic sequence is higher than 99%, for example if only 1 nucleotide differs as between donor and genomic sequences of over 100 contiguous base pairs.
- a non-homologous portion of the donor sequence can contain sequences not present in the region of interest, such that new sequences are introduced into the region of interest.
- the non-homologous sequence is generally flanked by sequences of 50-1,000 base pairs (or any integral value therebetween) or any number of base pairs greater than 1,000, that are homologous or identical to sequences in the region of interest.
- the donor sequence is non-homologous to the first sequence, and is inserted into the genome by non-homologous recombination mechanisms.
- Cleavage refers to the breakage of the covalent backbone of a DNA molecule. Cleavage can be initiated by a variety of methods including, but not limited to, enzymatic or chemical hydrolysis of a phosphodiester bond. Both single-stranded cleavage and double-stranded cleavage are possible, and double-stranded cleavage can occur as a result of two distinct single-stranded cleavage events. DNA cleavage can result in the production of either blunt ends or staggered ends. In certain embodiments, fusion polypeptides are used for targeted double-stranded DNA cleavage.
- a "cleavage half-domain” is a polypeptide sequence which, in conjunction with a second polypeptide (either identical or different) forms a complex having cleavage activity (preferably double-strand cleavage activity).
- first and second cleavage half-domains;" “+ and - cleavage half-domains” and “right and left cleavage half-domains” are used interchangeably to refer to pairs of cleavage half- domains that dimerize.
- An "engineered cleavage half-domain” is a cleavage half-domain that has been modified so as to form obligate heterodimers with another cleavage half- domain (e.g., another engineered cleavage half-domain). See, also, U.S. Patent Publication Nos. 2005/0064474, 20070218528, 20080131962and 20110201055, incorporated herein by reference in their entireties.
- sequence refers to a nucleotide sequence of any length, which can be DNA or RNA; can be linear, circular or branched and can be either single-stranded or double stranded.
- donor sequence refers to a nucleotide sequence that is inserted into a genome.
- a donor sequence can be of any length, for example between 2 and 100,000,000 nucleotides in length (or any integer value therebetween or thereabove), preferably between about 100 and 100,000 nucleotides in length (or any integer therebetween), more preferably between about 2000 and 20,000 nucleotides in length (or any value therebetween) and even more preferable, between about 5 and 15 kb (or any value therebetween).
- Chromatin is the nucleoprotein structure comprising the cellular genome.
- Cellular chromatin comprises nucleic acid, primarily DNA, and protein, including histones and non-histone chromosomal proteins.
- the majority of eukaryotic cellular chromatin exists in the form of nucleosomes, wherein a nucleosome core comprises approximately 150 base pairs of DNA associated with an octamer comprising two each of histones H2A, H2B, H3 and H4; and linker DNA (of variable length depending on the organism) extends between nucleosome cores.
- a molecule of histone HI is generally associated with the linker DNA.
- chromatin is meant to encompass all types of cellular nucleoprotein, both prokaryotic and eukaryotic.
- Cellular chromatin includes both chromosomal and episomal chromatin.
- a "chromosome,” is a chromatin complex comprising all or a portion of the genome of a cell.
- the genome of a cell is often characterized by its karyotype, which is the collection of all the chromosomes that comprise the genome of the cell.
- the genome of a cell can comprise one or more chromosomes.
- An "episome” is a replicating nucleic acid, nucleoprotein complex or other structure comprising a nucleic acid that is not part of the chromosomal karyotype of a cell.
- Examples of episomes include plasmids and certain viral genomes.
- An "accessible region” is a site in cellular chromatin in which a target site present in the nucleic acid can be bound by an exogenous molecule which recognizes the target site. Without wishing to be bound by any particular theory, it is believed that an accessible region is one that is not packaged into a nucleosomal structure. The distinct structure of an accessible region can often be detected by its sensitivity to chemical and enzymatic probes, for example, nucleases.
- a "target site” or “target sequence” is a nucleic acid sequence that defines a portion of a nucleic acid to which a binding molecule will bind, provided sufficient conditions for binding exist.
- exogenous molecule is a molecule that is not normally present in a cell, but can be introduced into a cell by one or more genetic, biochemical or other methods. "Normal presence in the cell" is determined with respect to the particular developmental stage and environmental conditions of the cell. Thus, for example, a molecule that is present only during embryonic development of muscle is an exogenous molecule with respect to an adult muscle cell. Similarly, a molecule induced by heat shock is an exogenous molecule with respect to a non-heat- shocked cell.
- An exogenous molecule can comprise, for example, a functioning version of a malfunctioning endogenous molecule or a malfunctioning version of a normally- functioning endogenous molecule.
- An exogenous molecule can be, among other things, a small molecule, such as is generated by a combinatorial chemistry process, or a macromolecule such as a protein, nucleic acid, carbohydrate, lipid, glycoprotein, lipoprotein,
- Nucleic acids include DNA and RNA, can be single- or double-stranded; can be linear, branched or circular; and can be of any length. Nucleic acids include those capable of forming duplexes, as well as triplex-forming nucleic acids. See, for example, U.S. Patent Nos. 5,176,996 and 5,422,251.
- Proteins include, but are not limited to, DNA-binding proteins, transcription factors, chromatin remodeling factors, methylated DNA binding proteins, polymerases, methylases, demethylases, acetylases, deacetylases, kinases, phosphatases, integrases, recombinases, ligases, topoisomerases, gyrases and helicases.
- an exogenous molecule can be the same type of molecule as an endogenous molecule, e.g., an exogenous protein or nucleic acid.
- an exogenous nucleic acid can comprise an infecting viral genome, a plasmid or episome introduced into a cell, or a chromosome that is not normally present in the cell.
- exogenous molecules into cells are known to those of skill in the art and include, but are not limited to, lipid-mediated transfer (i.e., liposomes, including neutral and cationic lipids), electroporation, direct injection, cell fusion, particle bombardment, calcium phosphate co-precipitation, DEAE-dextran- mediated transfer and viral vector-mediated transfer.
- An exogenous molecule can also be the same type of molecule as an endogenous molecule but derived from a different species than the cell is derived from.
- a human nucleic acid sequence may be introduced into a cell line originally derived from a mouse or hamster.
- Methods for the introduction of exogenous molecules into plant cells include, but are not limited to, protoplast transformation, silicon carbide (e.g., WHISKERSTM), Agrobacterium-mediated transformation, lipid- mediated transfer (i.e., liposomes, including neutral and cationic lipids),
- electroporation direct injection, cell fusion, particle bombardment (e.g., using a "gene gun"), calcium phosphate co-precipitation, DEAE-dextran-mediated transfer and viral vector-mediated transfer.
- an "endogenous" molecule is one that is normally present in a particular cell at a particular developmental stage under particular environmental conditions.
- an endogenous nucleic acid can comprise a chromosome, the genome of a mitochondrion, chloroplast or other organelle, or a naturally- occurring episomal nucleic acid.
- Additional endogenous molecules can include proteins, for example, transcription factors and enzymes.
- the term "product of an exogenous nucleic acid” includes both polynucleotide and polypeptide products, for example, transcription products (polynucleotides such as RNA) and translation products (polypeptides).
- a "fusion" molecule is a molecule in which two or more subunit molecules are linked, preferably covalently.
- the subunit molecules can be the same chemical type of molecule, or can be different chemical types of molecules.
- Examples of the first type of fusion molecule include, but are not limited to, fusion proteins (for example, a fusion between a ZFP or TALE DNA-binding domain and one or more activation domains) and fusion nucleic acids (for example, a nucleic acid encoding the fusion protein described supra).
- Examples of the second type of fusion molecule include, but are not limited to, a fusion between a triplex-forming nucleic acid and a polypeptide, and a fusion between a minor groove binder and a nucleic acid.
- Fusion protein in a cell can result from delivery of the fusion protein to the cell or by delivery of a polynucleotide encoding the fusion protein to a cell, wherein the polynucleotide is transcribed, and the transcript is translated, to generate the fusion protein.
- Trans-splicing, polypeptide cleavage and polypeptide ligation can also be involved in expression of a protein in a cell. Methods for polynucleotide and polypeptide delivery to cells are presented elsewhere in this disclosure.
- Gene expression refers to the conversion of the information, contained in a gene, into a gene product.
- a gene product can be the direct
- RNAs which are modified, by processes such as capping, polyadenylation, methylation, and editing, and proteins modified by, for example, methylation, acetylation, phosphorylation, ubiquitination, ADP-ribosylation, myristilation, and glycosylation.
- Modulation of gene expression refers to a change in the activity of a gene. Modulation of expression can include, but is not limited to, gene activation and gene repression.
- Genome editing e.g., cleavage, alteration, inactivation, random mutation
- Gene inactivation refers to any reduction in gene expression as compared to a cell that does not include a ZFP, TALE or CRISPR/Cas system as described herein. Thus, gene inactivation may be partial or complete.
- a "protected" mRNA is one in which the mRNA has been altered in some manner to increase the stability or translation of the mRNA.
- protections include the use of replacement of up to 25% of the cytodine and uridine residues with 2-thiouridine (s2U) and 5-methylcytidine (m5C).
- the resulting mRNA exhibits less immunogenicity and more stability as compared with its unmodified counterpart, (see Kariko et al. ((2012), Molecular Therapy, Vol. 16, No. 11, pages 1833 - 1844).
- Other changes include the addition of a so-called ARCA cap, which increases the translationability of the in vitro produced mRNA (see U.S. Patent US7074596).
- a "region of interest” is any region of cellular chromatin, such as, for example, a gene or a non-coding sequence within or adjacent to a gene, in which it is desirable to bind an exogenous molecule. Binding can be for the purposes of targeted DNA cleavage and/or targeted recombination.
- a region of interest can be present in a chromosome, an episome, an organellar genome ⁇ e.g., mitochondrial, chloroplast), or an infecting viral genome, for example.
- a region of interest can be within the coding region of a gene, within transcribed non-coding regions such as, for example, leader sequences, trailer sequences or introns, or within non-transcribed regions, either upstream or downstream of the coding region.
- a region of interest can be as small as a single nucleotide pair or up to 2,000 nucleotide pairs in length, or any integral value of nucleotide pairs.
- Eukaryotic cells include, but are not limited to, fungal cells (such as yeast), plant cells, animal cells, mammalian cells and human cells ⁇ e.g., T-cells).
- operative linkage and "operatively linked” (or “operably linked”) are used interchangeably with reference to a juxtaposition of two or more components (such as sequence elements), in which the components are arranged such that both components function normally and allow the possibility that at least one of the components can mediate a function that is exerted upon at least one of the other components.
- a transcriptional regulatory sequence such as a promoter
- a transcriptional regulatory sequence is operatively linked to a coding sequence if the transcriptional regulatory sequence controls the level of transcription of the coding sequence in response to the presence or absence of one or more transcriptional regulatory factors.
- transcriptional regulatory sequence is generally operatively linked in cis with a coding sequence, but need not be directly adjacent to it.
- an enhancer is a transcriptional regulatory sequence that is operatively linked to a coding sequence, even though they are not contiguous.
- the term "operatively linked" can refer to the fact that each of the components performs the same function in linkage to the other component as it would if it were not so linked.
- the ZFP, TALE or Cas DNA-binding domain and the activation domain are in operative linkage if, in the fusion polypeptide, the ZFP, TALE of Cas DNA-binding domain portion is able to bind its target site and/or its binding site, while the activation domain is able to upregulate gene expression.
- the ZFP, TALE or Cas DNA-binding domain and the cleavage domain are in operative linkage if, in the fusion polypeptide, the ZFP, TALE or Cas DNA-binding domain portion is able to bind its target site and/or its binding site, while the cleavage domain is able to cleave DNA in the vicinity of the target site.
- a "functional fragment" of a protein, polypeptide or nucleic acid is a protein, polypeptide or nucleic acid whose sequence is not identical to the full-length protein, polypeptide or nucleic acid, yet retains the same function as the full-length protein, polypeptide or nucleic acid.
- a functional fragment can possess more, fewer, or the same number of residues as the corresponding native molecule, and/or can contain one or more amino acid or nucleotide substitutions.
- DNA-binding function of a polypeptide can be determined, for example, by filter-binding, electrophoretic mobility-shift, or immunoprecipitation assays. DNA cleavage can be assayed by gel electrophoresis. See Ausubel et al., supra.
- the ability of a protein to interact with another protein can be determined, for example, by co-immunoprecipitation, two-hybrid assays or complementation, both genetic and biochemical.
- a "vector" is capable of transferring gene sequences to target cells.
- vector construct means any nucleic acid construct capable of directing the expression of a gene of interest and which can transfer gene sequences to target cells.
- vector construct means any nucleic acid construct capable of directing the expression of a gene of interest and which can transfer gene sequences to target cells.
- the term includes cloning, and expression vehicles, as well as integrating vectors.
- subject and patient are used interchangeably and refer to mammals such as human patients and non-human primates, as well as experimental animals such as rabbits, dogs, cats, rats, mice, and other animals. Accordingly, the term “subject” or “patient” as used herein means any mammalian patient or subject to which the or stem cells of the invention can be administered. Subjects of the present invention include those that have been exposed to one or more chemical toxins, including, for example, a nerve toxin.
- “Sternness” refers to the relative ability of any cell to act in a stem celllike manner, i.e., the degree of toti-, pluri-, or oligo-potency and expanded or indefinite self-renewal that any particular stem cell may have.
- compositions particularly nucleases, that are useful for in vivo cleavage of a donor molecule carrying a transgene and nucleases for cleavage of the genome of a cell such that the transgene is integrated into the genome in a targeted manner.
- one or more of the nucleases are naturally occurring.
- one or more of the nucleases are non- naturally occurring, i.e., engineered in the DNA-binding domain and/or cleavage domain.
- the DNA-binding domain of a naturally-occurring nuclease may be altered to bind to a selected target site ⁇ e.g., a meganuclease that has been engineered to bind to site different than the cognate binding site).
- a selected target site e.g., a meganuclease that has been engineered to bind to site different than the cognate binding site.
- the nuclease comprises heterologous DNA-binding and cleavage domains ⁇ e.g., zinc finger nucleases; TAL-effector domain DNA binding proteins; meganuclease DNA-binding domains with heterologous cleavage domains).
- heterologous DNA-binding and cleavage domains ⁇ e.g., zinc finger nucleases; TAL-effector domain DNA binding proteins; meganuclease DNA-binding domains with heterologous cleavage domains.
- the DNA binding domain of one or more of the nucleases used for in vivo cleavage and/or targeted cleavage of the genome of a cell comprises a zinc finger protein.
- the zinc finger protein is non- naturally occurring in that it is engineered to bind to a target site of choice. See, for example, See, for example, Beerli et al. (2002) Nature Biotechnol. 20: 135-141; Pabo et al. (2001) Ann. Rev. Biochem.70:313-340; Isalan et al. (2001) Nature
- An engineered zinc finger binding domain can have a novel binding specificity, compared to a naturally-occurring zinc finger protein.
- Engineering methods include, but are not limited to, rational design and various types of selection.
- Rational design includes, for example, using databases comprising triplet (or quadruplet) nucleotide sequences and individual zinc finger amino acid sequences, in which each triplet or quadruplet nucleotide sequence is associated with one or more amino acid sequences of zinc fingers which bind the particular triplet or quadruplet sequence. See, for example, co-owned U.S. Patents 6,453,242 and 6,534,261, incorporated by reference herein in their entireties.
- Exemplary selection methods including phage display and two-hybrid systems, are disclosed in US Patents 5,789,538; 5,925,523; 6,007,988; 6,013,453; 6,410,248; 6, 140,466; 6,200,759; and 6,242,568; as well as WO 98/37186;
- zinc finger domains and/or multi-fingered zinc finger proteins may be linked together using any suitable linker sequences, including for example, linkers of 5 or more amino acids in length. See, also, U.S. Patent Nos. 6,479,626; 6,903,185; and 7, 153,949 for exemplary linker sequences 6 or more amino acids in length.
- the proteins described herein may include any combination of suitable linkers between the individual zinc fingers of the protein.
- WO 96/06166 WO 98/53057; WO 98/54311; WO 00/27878; WO 01/60970 WO 01/88197; WO 02/099084; WO 98/53058; WO 98/53059; WO 98/53060;
- any linker may be used between one or more of the components of the DNA-binding domain (e.g., zinc fingers), between one or more DNA-binding domains and/or between the DNA-binding domain and the functional domain (e.g., nuclease).
- suitable linker sequences include U.S. Patent Nos. 8,772,453; 7,888,121; 6,479,626; 6,903, 185; and 7,153,949; and U.S. Publication Nos. 20090305419; 20150064789 and 20150132269.
- the proteins described herein may include any combination of suitable linkers between the individual DNA-binding components and/or between the DNA-binding domain and the functional domain of the compositions described herein.
- Any suitable cleavage domain can be operatively linked to the DNA- binding domains as described herein to form a nuclease.
- the cleavage domain may be heterologous to the DNA-binding domain, for example a zinc finger DNA-binding domain and a cleavage domain from a nuclease.
- Heterologous cleavage domains can be obtained from any endonuclease or exonuclease.
- Exemplary endonucleases from which a cleavage domain can be derived include, but are not limited to, restriction endonucleases and homing endonucleases. See, for example, 2002-2003 Catalogue, New England Biolabs, Beverly, MA; and Belfort et al. (1997) Nucleic Acids
- cleavage half-domain can be derived from any nuclease or portion thereof, as set forth above, that requires dimerization for cleavage activity.
- two fusion proteins are required for cleavage if the fusion proteins comprise cleavage half-domains.
- a single protein comprising two cleavage half- domains can be used.
- the two cleavage half-domains can be derived from the same endonuclease (or functional fragments thereof), or each cleavage half-domain can be derived from a different endonuclease (or functional fragments thereof).
- the target sites for the two fusion proteins are preferably disposed, with respect to each other, such that binding of the two fusion proteins to their respective target sites places the cleavage half-domains in a spatial orientation to each other that allows the cleavage half-domains to form a functional cleavage domain, e.g., by dimerizing.
- the near edges of the target sites are separated by 5-8 nucleotides or by 15-18 nucleotides.
- any integral number of nucleotides or nucleotide pairs can intervene between two target sites (e.g., from 2 to 50 nucleotide pairs or more).
- the site of cleavage lies between the target sites.
- Restriction endonucleases are present in many species and are capable of sequence-specific binding to DNA (at a recognition site), and cleaving DNA at or near the site of binding.
- Certain restriction enzymes e.g., Type IIS
- Fok I catalyzes double-stranded cleavage of DNA, at 9 nucleotides from its recognition site on one strand and 13 nucleotides from its recognition site on the other. See, for example, U.S.
- fusion proteins comprise the cleavage domain (or cleavage half-domain) from at least one Type IIS restriction enzyme and one or more zinc finger binding domains, which may or may not be engineered.
- An exemplary Type IIS restriction enzyme whose cleavage domain is separable from the binding domain, is Fokl. This particular enzyme is active as a dimer. Bitinaite et al. (1998) Proc. Natl. Acad. Sci. USA 95: 10,570-10,575.
- the portion of the Fok I enzyme used in the disclosed fusion proteins is considered a cleavage half-domain.
- two fusion proteins each comprising a Fokl cleavage half-domain, can be used to reconstitute a catalytically active cleavage domain.
- a single polypeptide molecule containing a zinc finger binding domain and two Fok I cleavage half-domains can also be used. Parameters for targeted cleavage and targeted sequence alteration using zinc fmger-Fok I fusions are provided elsewhere in this disclosure.
- a cleavage domain or cleavage half-domain can be any portion of a protein that retains cleavage activity, or that retains the ability to multimerize (e.g., dimerize) to form a functional cleavage domain.
- the cleavage domain comprises one or more engineered cleavage half-domain (also referred to as dimerization domain mutants) that minimize or prevent homodimerization, as described, for example, in See, e.g., U.S. Patent Nos. 7,914,796; 8,034,598 and 8,623,618, the disclosures of all of which are incorporated by reference in their entireties herein.
- Amino acid residues at positions 446, 447, 479, 483, 484, 486, 487, 490, 491, 496, 498, 499, 500, 531, 534, 537, and 538 of Fokl are all targets for influencing dimerization of the Fokl cleavage half-domains.
- Exemplary engineered cleavage half-domains of Fokl that form obligate heterodimers include a pair in which a first cleavage half-domain includes mutations at amino acid residues at positions 490 and 538 of Fokl and a second cleavage half-domain includes mutations at amino acid residues 486 and 499.
- a mutation at 490 replaces Glu (E) with Lys
- the engineered cleavage half-domains described herein were prepared by mutating positions 490 (E ⁇ K) and 538 (I ⁇ K) in one cleavage half-domain to produce an engineered cleavage half-domain designated "E490K:I538K” and by mutating positions 486 (Q ⁇ E) and 499 (I ⁇ L) in another cleavage half-domain to produce an engineered cleavage half-domain designated "Q486E:I499L".
- the engineered cleavage half-domains described herein are obligate heterodimer mutants in which aberrant cleavage is minimized or abolished. See, e.g., U.S. Patent
- the engineered cleavage half- domain comprises mutations at positions 486, 499 and 496 (numbered relative to wild-type Fokl), for instance mutations that replace the wild type Gin (Q) residue at position 486 with a Glu (E) residue, the wild type Iso (I) residue at position 499 with a Leu (L) residue and the wild-type Asn (N) residue at position 496 with an Asp (D) or Glu (E) residue (also referred to as a "ELD” and "ELE” domains, respectively).
- the engineered cleavage half-domain comprises mutations at positions 490, 538 and 537 (numbered relative to wild-type Fokl), for instance mutations that replace the wild type Glu (E) residue at position 490 with a Lys (K) residue, the wild type Iso (I) residue at position 538 with a Lys (K) residue, and the wild-type His (H) residue at position 537 with a Lys (K) residue or a Arg (R) residue (also referred to as "KKK” and "KKR” domains, respectively).
- E wild type Glu
- I Iso
- H His
- R Arg
- the engineered cleavage half-domain comprises mutations at positions 490 and 537 (numbered relative to wild-type Fokl), for instance mutations that replace the wild type Glu (E) residue at position 490 with a Lys (K) residue and the wild-type His (H) residue at position 537 with a Lys (K) residue or a Arg (R) residue (also referred to as "KIK” and "KIR” domains, respectively. See, e.g., U.S. Patent Nos. 7,914,796; 8,034,598 and 8,623,618.
- the engineered cleavage half domain comprises the "Sharkey” and/or “Sharkey' " mutations (see Guo et al, (2010) J. Mol. Biol. 400(1):96-107).
- Engineered cleavage half-domains described herein can be prepared using any suitable method, for example, by site-directed mutagenesis of wild-type cleavage half-domains ⁇ Fok I) as described in U.S. Patent Publication Nos. 7,888,121; 7,914,796; 8,034,598 and 8,623,618.
- nucleases may be assembled in vivo at the nucleic acid target site using so-called "split-enzyme” technology ⁇ see, e.g. U.S. Patent Publication No. 20090068164).
- split-enzyme a split enzyme
- Components of such split enzymes may be expressed either on separate expression constructs, or can be linked in one open reading frame where the individual components are separated, for example, by a self-cleaving 2A peptide or IRES sequence.
- Components may be individual zinc finger binding domains or domains of a meganuclease nucleic acid binding domain.
- Nucleases can be screened for activity prior to use, for example in a yeast-based chromosomal system as described in WO 2009/042163 and
- Expression of the nuclease may be under the control of a constitutive promoter or an inducible promoter, for example the galactokinase promoter which is activated (de-repressed) in the presence of raffinose and/or galactose and repressed in presence of glucose.
- a constitutive promoter or an inducible promoter for example the galactokinase promoter which is activated (de-repressed) in the presence of raffinose and/or galactose and repressed in presence of glucose.
- the nuclease(s) as described herein may make one or more double- stranded and/or single-stranded cuts in the target site.
- the nuclease comprises a catalytically inactive cleavage domain (e.g., Fokl and/or Cas protein). See, e.g., U.S. Patent No. 9,200,266; 8,703,489 and Guillinger et al. (2014) Nature Biotech. 32(6):577-582.
- the catalytically inactive cleavage domain may, in combination with a catalytically active domain act as a nickase to make a single- stranded cut.
- nickases can be used in combination to make a double- stranded cut in a specific region. Additional nickases are also known in the art, for example, McCaffery et al. (2016) Nucleic Acids Res. 44(2):el l . doi:
- DNA domains can be engineered to bind to any sequence of choice.
- An engineered DNA-binding domain can have a novel binding specificity, compared to a naturally-occurring DNA-binding domain.
- the DNA-binding domains bind to a sequence within a BCLl 1 A enhancer sequence, for example a target site (typically 9, 10, 11, 12, 13, 14, 15, 16,
- Rational design includes, for example, using databases comprising triplet (or quadruplet) nucleotide sequences and individual zinc finger amino acid sequences, in which each triplet or quadruplet nucleotide sequence is associated with one or more amino acid sequences of zinc fingers which bind the particular triplet or quadruplet sequence. See, for example, co-owned U.S. Patents 6,453,242 and 6,534,261, incorporated by reference herein in their entireties. Rational design of TAL-effector domains can also be performed. See, e.g., U.S. Publication No.
- DNA-binding domains ⁇ e.g., multi-fingered zinc finger proteins
- fusions of DNA-binding domain(s) and functional domain(s) may be linked together using any suitable linker sequences, including for example, linkers of 5 or more amino acids.
- linkers of 5 or more amino acids include for example, linkers of 5 or more amino acids.
- U.S. Patent Nos. 8,772,453; 7,888,121 e.g., "ZC” linker
- the proteins described herein may include any combination of suitable linkers between the individual DNA-binding domains of the protein. See, also, U.S. Patent No. 8,586,526.
- the present disclosure relates to nuclease- mediated targeted integration of an exogenous sequence into the genome of a cell using the BCL11 A enhancer region-binding molecules described herein.
- insertion of an exogenous sequence also called a "donor sequence” or “donor” or “transgene”
- donor sequence is typically not identical to the genomic sequence where it is placed.
- a donor sequence can contain a non-homologous sequence flanked by two regions of homology to allow for efficient HDR at the location of interest or can be integrated via non-homology directed repair mechanisms.
- donor sequences can comprise a vector molecule containing sequences that are not homologous to the region of interest in cellular chromatin.
- a donor molecule can contain several, discontinuous regions of homology to cellular chromatin, and, for example, lead to a deletion of a Bell la enhancer region (or a fragment therereof) when used as a substrate for repair of a DBS induced by one of the nucleases described here.
- said sequences can be present in a donor nucleic acid molecule and flanked by regions of homology to sequence in the region of interest.
- Polynucleotides for insertion can also be referred to as "exogenous" polynucleotides, "donor” polynucleotides or molecules or “transgenes.”
- the donor polynucleotide can be DNA or RNA, single-stranded and/or double-stranded and can be introduced into a cell in linear or circular form. See, e.g., U.S. Patent Publication Nos. 20100047805 and 20110207221.
- the donor sequence(s) are preferably contained within a DNA MC, which may be introduced into the cell in circular or linear form.
- the ends of the donor sequence can be protected ⁇ e.g., from exonucleolytic degradation) by methods known to those of skill in the art.
- one or more dideoxy nucleotide residues are added to the 3' terminus of a linear molecule and/or self-complementary oligonucleotides are ligated to one or both ends. See, for example, Chang et al. (1987) Proc. Natl. Acad. Sci. i/&484:4959-4963; Nehls et al. (1996) Science 272:886-889.
- the donor may include one or more nuclease target sites, for example, nuclease target sites flanking the transgene to be integrated into the cell's genome. See, e.g., U.S. Patent
- a polynucleotide can be introduced into a cell as part of a vector molecule having additional sequences such as, for example, replication origins, promoters and genes encoding antibiotic resistance.
- donor polynucleotides can be introduced as naked nucleic acid, as nucleic acid complexed with an agent such as a liposome or poloxamer, or can be delivered by viruses (e.g., adenovirus, AAV, herpesvirus, retrovirus, lentivirus and integrase defective lentivirus (IDLV)).
- viruses e.g., adenovirus, AAV, herpesvirus, retrovirus, lentivirus and integrase defective lentivirus (IDLV)
- the double-stranded donor includes sequences
- the double-stranded donor also includes at least one nuclease target site, for example.
- the donor includes at least 2 target sites, for example for a pair of ZFNs or TALENs.
- the nuclease target sites are outside the transgene sequences, for example, 5' and/or 3' to the transgene sequences, for cleavage of the transgene.
- the nuclease cleavage site(s) may be for any nuclease(s).
- the nuclease target site(s) contained in the double-stranded donor are for the same nuclease(s) used to cleave the endogenous target into which the cleaved donor is integrated via homology-independent methods.
- the donor is generally inserted so that its expression is driven by the endogenous promoter at the integration site, namely the promoter that drives expression of the endogenous gene into which the donor is inserted (e.g., globin, AAVS1, etc.).
- the donor may comprise a promoter and/or enhancer, for example a constitutive promoter or an inducible or tissue specific promoter.
- the donor molecule may be inserted into an endogenous gene such that all, some or none of the endogenous gene is expressed.
- the transgene e.g., with or without globin encoding sequences
- the transgene is integrated into any endogenous locus, for example a safe-harbor locus. See, e.g., U.S. Patent Publications 20080299580; 20080159996 and 201000218264.
- exogenous sequences may also include transcriptional or translational regulatory sequences, for example, promoters, enhancers, insulators, internal ribosome entry sites, sequences encoding 2A peptides and/or polyadenylation signals.
- the transgenes carried on the donor sequences described herein may be isolated from plasmids, cells or other sources using standard techniques known in the art such as PCR.
- Donors for use can include varying types of topology, including circular supercoiled, circular relaxed, linear and the like. Alternatively, they may be chemically synthesized using standard oligonucleotide synthesis techniques. In addition, donors may be methylated or lack methylation.
- Donors may be in the form of bacterial or yeast artificial chromosomes (BACs or YACs).
- the double-stranded donor polynucleotides described herein may include one or more non-natural bases and/or backbones.
- insertion of a donor molecule with methylated cytosines may be carried out using the methods described herein to achieve a state of transcriptional quiescence in a region of interest.
- exogenous (donor) polynucleotide may comprise any sequence of interest (exogenous sequence).
- exogenous sequences include, but are not limited to any polypeptide coding sequence (e.g., cDNAs), promoter sequences, enhancer sequences, epitope tags, marker genes, cleavage enzyme recognition sites and various types of expression constructs.
- Marker genes include, but are not limited to, sequences encoding proteins that mediate antibiotic resistance (e.g., ampicillin resistance, neomycin resistance, G418 resistance, puromycin resistance), sequences encoding colored or fluorescent or luminescent proteins (e.g., green fluorescent protein, enhanced green fluorescent protein, red fluorescent protein, luciferase), and proteins which mediate enhanced cell growth and/or gene amplification (e.g., dihydrofolate reductase).
- Epitope tags include, for example, one or more copies of FLAG, His, myc, Tap, HA or any detectable amino acid sequence.
- the exogenous sequence comprises a polynucleotide encoding any polypeptide of which expression in the cell is desired, including, but not limited to antibodies, antigens, enzymes, receptors (cell surface or nuclear), hormones, lymphokines, cytokines, reporter polypeptides, growth factors, and functional fragments of any of the above.
- the coding sequences may be, for example, cDNAs.
- the exogenous sequence may comprise a sequence encoding a polypeptide that is lacking or non-functional in the subject having a genetic disease, including but not limited to any of the following genetic diseases: achondroplasia, achromatopsia, acid maltase deficiency, adenosine deaminase deficiency (OMIM No.102700), adrenoleukodystrophy, aicardi syndrome, alpha- 1 antitrypsin deficiency, alpha-thalassemia, androgen insensitivity syndrome, apert syndrome, arrhythmogenic right ventricular, dysplasia, ataxia telangictasia, barth syndrome, beta-thai as semi a, blue rubber bleb nevus syndrome, canavan disease, chronic granulomatous diseases (CGD), cri du chat syndrome, cystic fibrosis, dercum's disease, ectodermal dysplasia, fanconi anemia, fibrody
- CCD chronic
- LAD leukocyte adhesion deficiency
- leukodystrophy long QT syndrome, Marfan syndrome, Moebius syndrome, mucopolysaccharidosis (MPS), nail patella syndrome, nephrogenic diabetes insipdius, neurofibromatosis, Neimann-Pick disease, osteogenesis imperfecta, porphyria, Prader- Willi syndrome, progeria, Proteus syndrome, retinoblastoma, Rett syndrome,
- MPS mucopolysaccharidosis
- SCID immunodeficiency
- Shwachman syndrome sickle cell disease (sickle cell anemia), Smith-Magenis syndrome, Stickler syndrome, Tay-Sachs disease,
- TAR Thrombocytopenia Absent Radius
- Treacher Collins syndrome trisomy, tuberous sclerosis, Turner's syndrome, urea cycle disorder, von Hippel- Landau disease, Waardenburg syndrome, Williams syndrome, Wilson's disease, Wiskott-Aldrich syndrome, X-linked lymphoproliferative syndrome (XLP, OMIM No. 308240).
- Additional exemplary diseases that can be treated by targeted integration include acquired immunodeficiencies, lysosomal storage diseases (e.g., Gaucher' s disease, GM1, Fabry disease and Tay-Sachs disease),
- mucopolysaccahidosis e.g. Hunter's disease, Hurler' s disease
- hemoglobinopathies e.g., sickle cell diseases, HbC, a-thalassemia, ⁇ -thalassemia
- hemophilias e.g., hemophilias.
- the exogenous sequences can comprise a marker gene (described above), allowing selection of cells that have undergone targeted integration, and a linked sequence encoding an additional functionality.
- marker genes include GFP, drug selection marker(s) and the like.
- Additional gene sequences that can be inserted may include, for example, wild-type genes to replace mutated sequences.
- a wild-type Factor IX gene sequence may be inserted into the genome of a stem cell in which the endogenous copy of the gene is mutated.
- the wild-type copy may be inserted at the endogenous locus, or may alternatively be targeted to a safe harbor locus.
- Construction of such expression cassettes following the teachings of the present specification, utilizes methodologies well known in the art of molecular biology (see, for example, Ausubel or Maniatis). Before use of the expression cassette to generate a transgenic animal, the responsiveness of the expression cassette to the stress-inducer associated with selected control elements can be tested by introducing the expression cassette into a suitable cell line (e.g., primary cells, transformed cells, or immortalized cell lines).
- a suitable cell line e.g., primary cells, transformed cells, or immortalized cell lines.
- exogenous sequences may also transcriptional or translational regulatory sequences, for example, promoters, enhancers, insulators, internal ribosome entry sites, sequences encoding 2A peptides and/or polyadenylation signals.
- control elements of the genes of interest can be operably linked to reporter genes to create chimeric genes (e.g., reporter expression cassettes).
- Targeted insertion of non-coding nucleic acid sequence may also be achieved. Sequences encoding antisense RNAs, RNAi, shRNAs and micro RNAs (miRNAs) may also be used for targeted insertions.
- the donor nucleic acid may comprise non- coding sequences that are specific target sites for additional nuclease designs.
- nucleases may be expressed in cells such that the original donor molecule is cleaved and modified by insertion of another donor molecule of interest.
- additional nucleases may be expressed in cells such that the original donor molecule is cleaved and modified by insertion of another donor molecule of interest.
- reiterative integrations of donor molecules may be generated allowing for trait stacking at a particular locus of interest or at a safe harbor locus.
- nucleases as described herein (Table 1), polynucleotides encoding these nucleases, donor polynucleotides and compositions comprising the proteins and/or polynucleotides described herein may be delivered in vivo or ex vivo by any suitable means into any cell type.
- Suitable cells include eukaryotic (e.g., animal) and prokaryotic cells and/or cell lines.
- Non-limiting examples of such cells or cell lines generated from such cells include COS, CHO (e.g., CHO-S, CHO-Kl, CHO-DG44, CHO-DUXB l l, CHO-DUKX, CHOK1 SV), VERO, MDCK, WI38, V79, B14AF28-G3, BHK, HaK, NS0, SP2/0-Agl4, HeLa, HEK293 (e.g., HEK293-F, HEK293-H, HEK293-T), and perC6 cells as well as insect cells such as Spodopterafugiperda (Sf), or fungal cells such as Saccharomyces, Pichia and Schizosaccharomyces.
- COS e.g., CHO-S, CHO-Kl, CHO-DG44, CHO-DU
- the cell line is a CHO, MDCK or HEK293 cell line.
- Suitable cells also include stem cells such as, by way of example, embryonic stem cells, induced pluripotent stem cells, hematopoietic stem cells, neuronal stem cells and mesenchymal stem cells.
- Nucleases and/or donor constructs as described herein may also be delivered using vectors containing sequences encoding one or more of the ZFN(s), described herein.
- Any vector systems may be used including, but not limited to, plasmid vectors, retroviral vectors, lentiviral vectors, adenovirus vectors, poxvirus vectors; herpesvirus vectors and adeno-associated virus vectors, etc. See, also, U.S. Patent Nos. 6,534,261; 6,607,882; 6,824,978; 6,933, 113; 6,979,539; 7,013,219; and 7, 163,824, incorporated by reference herein in their entireties.
- any of these vectors may comprise one or more of the sequences needed for treatment.
- the nucleases and/or donor polynucleotide may be carried on the same vector or on different vectors (DNA MC(s)).
- each vector may comprise a sequence encoding one or multiple nucleases and/or donor constructs.
- Conventional viral and non-viral based gene transfer methods can be used to introduce nucleic acids encoding nucleases and/or donor constructs in cells ⁇ e.g., mammalian cells) and target tissues.
- Non-viral vector delivery systems include DNA or RNA plasmids, DNA MCs, naked nucleic acid, and nucleic acid complexed with a delivery vehicle such as a liposome or poloxamer.
- Suitable non-viral vectors include nanotaxis vectors, including vectors commercially available from InCellArt (France).
- Viral vector delivery systems include DNA and RNA viruses, which have either episomal or integrated genomes after delivery to the cell.
- Methods of non-viral delivery of nucleic acids include electroporation, lipofection, microinjection, biolistics, virosomes, liposomes, immunoliposomes, polycation or lipid:nucleic acid conjugates, naked DNA, artificial virions, and agent- enhanced uptake of DNA. Sonoporation using, e.g., the Sonitron 2000 system (Rich- Mar) can also be used for delivery of nucleic acids.
- nucleic acid delivery systems include those provided by Amaxa Biosystems (Cologne, Germany), Maxcyte, Inc. (Rockville, Maryland), BTX Molecular Delivery Systems (Holliston, MA) and Copernicus Therapeutics Inc., ⁇ see for example US6008336).
- Lipofection is described in e.g., U.S. Patent Nos. 5,049,386; 4,946,787; and 4,897,355) and lipofection reagents are sold commercially ⁇ e.g., TransfectamTM and LipofectinTM).
- Cationic and neutral lipids that are suitable for efficient receptor-recognition lipofection of polynucleotides include those of Feigner, WO 91/17424, WO 91/16024.
- lipid:nucleic acid complexes including targeted liposomes such as immunolipid complexes
- Boese et al Cancer Gene Ther. 2:291-297 (1995); Behr et al, Bioconjugate Chem. 5:382-389 (1994); Remy et al, Bioconjugate Chem. 5:647-654 (1994); Gao et al, Gene Therapy 2:710-722 (1995); Ahmad et al, Cancer Res. 52:4817-4820 (1992); U.S. Pat. Nos. 4, 186,183, 4,217,344, 4,235,871, 4,261,975, 4,485,054, 4,501,728, 4,774,085, 4,837,028, and 4,946,787).
- Additional methods of delivery include the use of packaging the nucleic acids to be delivered into EnGeneIC delivery vehicles (EDVs). These EDVs are specifically delivered to target tissues using bispecific antibodies where one arm of the antibody has specificity for the target tissue and the other has specificity for the EDV. The antibody brings the EDVs to the target cell surface and then the EDV is brought into the cell by endocytosis. Once in the cell, the contents are released ⁇ see MacDiarmid et al (2009) Nature Biotechnology 27(7):643).
- EDVs EnGeneIC delivery vehicles
- RNA or DNA viral based systems for the delivery of nucleic acids encoding engineered ZFPs, TALEs and/or CRISPR/Cas systems take advantage of highly evolved processes for targeting a virus to specific cells in the body and trafficking the viral payload to the nucleus.
- Viral vectors can be
- ZFPs are administered directly to patients ⁇ in vivo) or they can be used to treat cells in vitro and the modified cells are administered to patients ⁇ ex vivo).
- Conventional viral based systems for the delivery of ZFPs include, but are not limited to, retroviral, lentivirus, adenoviral, adeno-associated, vaccinia and herpes simplex virus vectors for gene transfer. Integration in the host genome is possible with the retrovirus, lentivirus, and adeno-associated virus gene transfer methods, often resulting in long term expression of the inserted transgene. Additionally, high transduction efficiencies have been observed in many different cell types and target tissues.
- Lentiviral vectors are retroviral vectors that are able to transduce or infect non-dividing cells and typically produce high viral titers. Selection of a retroviral gene transfer system depends on the target tissue. Retroviral vectors are comprised of czs-acting long terminal repeats with packaging capacity for up to 6-10 kb of foreign sequence. The minimum cz ' s-acting LTRs are sufficient for replication and packaging of the vectors, which are then used to integrate the therapeutic gene into the target cell to provide permanent transgene expression.
- Widely used retroviral vectors include those based upon murine leukemia virus (MuLV), gibbon ape leukemia virus (GaLV), Simian Immunodeficiency virus (SIV), human immunodeficiency virus (HIV), and combinations thereof ⁇ see, e.g., Buchscher et al., J. Virol. 66:2731-2739 (1992); Johann et al, J. Virol. 66: 1635-1640 (1992); Sommerfelt et al, Virol. 176:58-59 (1990); Wilson et al, J. Virol.63 :23 '4-2378 (1989); Miller et al, J. Virol. 65:2220- 2224 (1991); PCT/US94/05700).
- MiLV murine leukemia virus
- GaLV gibbon ape leukemia virus
- SIV Simian Immunodeficiency virus
- HAV human immunodeficiency virus
- Adenoviral based systems can be used.
- Adenoviral based vectors are capable of very high transduction efficiency in many cell types and do not require cell division. With such vectors, high titer and high levels of expression have been obtained. This vector can be produced in large quantities in a relatively simple system.
- Adeno-associated virus (“AAV”) vectors are also used to transduce cells with target nucleic acids, e.g., in the in vitro production of nucleic acids and peptides, and for in vivo and ex vivo gene therapy procedures ⁇ see, e.g., West et al, Virology 160:38-47 (1987); U.S. Patent No. 4,797,368; WO 93/24641; Kotin, Human Gene Therapy 5:793-801 (1994);
- At least six viral vector approaches are currently available for gene transfer in clinical trials, which utilize approaches that involve complementation of defective vectors by genes inserted into helper cell lines to generate the transducing agent.
- pLASN and MFG-S are examples of retroviral vectors that have been used in clinical trials (Dunbar et al, Blood 85:3048-305 (1995); Kohn et al, Nat. Med. 1 : 1017-102 (1995); Malech et al, PNAS 94:22 12133-12138 (1997)).
- PA317/pLASN was the first therapeutic vector used in a gene therapy trial. (Blaese et al, Science 270:475-480 (1995)). Transduction efficiencies of 50% or greater have been observed for MFG-S packaged vectors. (Ellem et al, Immunol Immunother. 44(l): 10-20 (1997); Dranoff et al, Hum. Gene Ther. 1 : 111-2 (1997).
- rAAV Recombinant adeno-associated virus vectors
- All vectors are derived from a plasmid that retains only the AAV 145 bp inverted terminal repeats flanking the transgene expression cassette. Efficient gene transfer and stable transgene delivery due to integration into the genomes of the transduced cell are key features for this vector system.
- AAV serotypes including AAV1, AAV2, AAV3, AAV4, AAV5, AAV6, AAV7, AAV8, AAV9 and AAVrh. lO and any novel AAV serotype can also be used in accordance with the present invention.
- Ad Replication-deficient recombinant adenoviral vectors
- Ad can be produced at high titer and readily infect a number of different cell types.
- Most adenovirus vectors are engineered such that a transgene replaces the Ad El a, Elb, and/or E3 genes; subsequently the replication defective vector is propagated in human 293 cells that supply deleted gene function in trans.
- Ad vectors can transduce multiple types of tissues in vivo, including nondividing, differentiated cells such as those found in liver, kidney and muscle. Conventional Ad vectors have a large carrying capacity.
- Ad vector An example of the use of an Ad vector in a clinical trial involved polynucleotide therapy for antitumor immunization with intramuscular injection (Sterman et al., Hum. Gene Ther. 7: 1083-9 (1998)). Additional examples of the use of adenovims vectors for gene transfer in clinical trials include Rosenecker et al, Infection 24: 1 5-10 (1996); Sterman et al, Hum. Gene Ther. 9:7 1083-1089 (1998); Welsh et al, Hum. Gene Ther. 2:205-18 (1995); Alvarez et al, Hum. Gene Ther. 5:597-613 (1997); Topf et al, Gene Ther. 5:507-513 (1998); Sterman et al, Hum. Gene Ther. 7: 1083-1089 (1998).
- Packaging cells are used to form virus particles that are capable of infecting a host cell. Such cells include 293 cells, which package adenovirus, and ⁇ 2 cells or PA317 cells, which package retrovirus.
- Viral vectors used in gene therapy are usually generated by a producer cell line that packages a nucleic acid vector into a viral particle. The vectors typically contain the minimal viral sequences required for packaging and subsequent integration into a host (if applicable), other viral sequences being replaced by an expression cassette encoding the protein to be expressed. The missing viral functions are supplied in trans by the packaging cell line.
- AAV vectors used in gene therapy typically only possess inverted terminal repeat (ITR) sequences from the AAV genome which are required for packaging and integration into the host genome.
- ITR inverted terminal repeat
- Viral DNA is packaged in a cell line, which contains a helper plasmid encoding the other AAV genes, namely rep and cap, but lacking ITR sequences.
- the cell line is also infected with adenovirus as a helper.
- the helper virus promotes replication of the AAV vector and expression of AAV genes from the helper plasmid.
- the helper plasmid is not packaged in significant amounts due to a lack of ITR sequences. Contamination with adenovirus can be reduced by, e.g., heat treatment to which adenovirus is more sensitive than AAV.
- the gene therapy vector be delivered with a high degree of specificity to a particular tissue type.
- a viral vector can be modified to have specificity for a given cell type by expressing a ligand as a fusion protein with a viral coat protein on the outer surface of the virus.
- the ligand is chosen to have affinity for a receptor known to be present on the cell type of interest.
- Han et al Proc. Natl. Acad. Sci. USA 92:9747- 9751 (1995), reported that Moloney murine leukemia virus can be modified to express human heregulin fused to gp70, and the recombinant virus infects certain human breast cancer cells expressing human epidermal growth factor receptor.
- filamentous phage can be engineered to display antibody fragments (e.g., FAB or Fv) having specific binding affinity for virtually any chosen cellular receptor.
- Gene therapy vectors can be delivered in vivo by administration to an individual patient, typically by systemic administration ⁇ e.g., intravenous,
- vectors can be delivered to cells ex vivo, such as cells explanted from an individual patient ⁇ e.g., lymphocytes, bone marrow aspirates, tissue biopsy) or universal donor hematopoietic stem cells, followed by reimplantation of the cells into a patient, usually after selection for cells which have incorporated the vector.
- cells ex vivo such as cells explanted from an individual patient ⁇ e.g., lymphocytes, bone marrow aspirates, tissue biopsy) or universal donor hematopoietic stem cells, followed by reimplantation of the cells into a patient, usually after selection for cells which have incorporated the vector.
- Vectors ⁇ e.g., retroviruses, adenoviruses, liposomes, etc.
- nucleases and/or donor constructs can also be administered directly to an organism for transduction of cells in vivo.
- naked DNA can be administered.
- Administration is by any of the routes normally used for introducing a molecule into ultimate contact with blood or tissue cells including, but not limited to, injection, infusion, topical application and electroporation. Suitable methods of administering such nucleic acids are available and well known to those of skill in the art, and, although more than one route can be used to administer a particular composition, a particular route can often provide a more immediate and more effective reaction than another route.
- Vectors suitable for introduction of polynucleotides ⁇ e.g. nuclease- encoding and/or double-stranded donors) described herein include non-integrating lentivirus vectors (IDLV). See, for example, Ory et al. (1996) Proc. Natl. Acad. Sci. USA 93: 11382-11388; Dull et al. (1998) 7. Virol.72:8463-8471; Zuffery e/ a/. (1998) 7 Virol. 72:9873-9880; Follenzi et al. (2000) Nature Genetics 25:217 -222; U.S. Patent Publication No 2009/0117617.
- IDLV non-integrating lentivirus vectors
- compositions are determined in part by the particular composition being administered, as well as by the particular method used to administer the composition. Accordingly, there is a wide variety of suitable formulations of pharmaceutical compositions available, as described below (see, e.g., Remington 's Pharmaceutical Sciences, 17th ed., 1989).
- nuclease-encoding sequences and donor constructs can be delivered using the same or different systems.
- the nucleases and donors can be carried by the same DNA MC.
- a donor polynucleotide can be carried by a MC, while the one or more nucleases can be carried by a standard plasmid or AAV vector.
- the different vectors can be administered by the same or different routes (intramuscular injection, tail vein injection, other intravenous injection, intraperitoneal administration and/or intramuscular injection. The vectors can be delivered simultaneously or in any sequential order.
- the instant disclosure includes in vivo or ex vivo treatment of diseases and conditions that are amenable to insertion of a transgenes encoding a therapeutic protein.
- the compositions are administered to a human patient in an amount effective to obtain the desired concentration of the therapeutic polypeptide in the serum or the target organ or cells.
- Administration can be by any means in which the polynucleotides are delivered to the desired target cells.
- both in vivo and ex vivo methods are contemplated.
- Intravenous injection to the portal vein is a preferred method of administration.
- in vivo administration modes include, for example, direct injection into the lobes of the liver or the biliary duct and intravenous injection distal to the liver, including through the hepatic artery, direct injection in to the liver parenchyma, injection via the hepatic artery, and/or retrograde injection through the biliary tree.
- Ex vivo modes of administration include transduction in vitro of resected hepatocytes or other cells of the liver, followed by infusion of the transduced, resected hepatocytes back into the portal vasculature, liver parenchyma or biliary tree of the human patient, see e.g., Grossman et al., ( ⁇ 994)Nature Genetics, 6:335-341.
- nuclease(s) and donor to be administered will vary from patient to patient and according to the therapeutic polypeptide of interest. Accordingly, effective amounts are best determined by the physician administering the compositions and appropriate dosages can be determined readily by one of ordinary skill in the art. After allowing sufficient time for integration and expression (typically 4-15 days, for example), analysis of the serum or other tissue levels of the therapeutic polypeptide and comparison to the initial level prior to administration will determine whether the amount being administered is too low, within the right range or too high. Suitable regimes for initial and subsequent administrations are also variable, but are typified by an initial administration followed by subsequent administrations if necessary. Subsequent administrations may be administered at variable intervals, ranging from daily to annually to every several years.
- Formulations for both ex vivo and in vivo administrations include suspensions in liquid or emulsified liquids.
- the active ingredients often are mixed with excipients which are pharmaceutically acceptable and compatible with the active ingredient.
- Suitable excipients include, for example, water, saline, dextrose, glycerol, ethanol or the like, and combinations thereof.
- the composition may contain minor amounts of auxiliary substances, such as, wetting or emulsifying agents, pH buffering agents, stabilizing agents or other reagents that enhance the effectiveness of the pharmaceutical composition.
- endogenous BCL11 A enhancer sequence is modified by the nucleases described herein (Table 1).
- the modification may be, for example, as compared to the wild- type sequence of the cell.
- the cell or cell lines may be heterozygous or homozygous for the modification.
- the modifications to the BCL11 A sequence may comprise insertions, deletions and/or combinations thereof.
- the modification is preferably at or near the nuclease(s) binding and/or cleavage site(s), for example, within 1-300 (or any value therebetween) base pairs upstream or downstream of the site(s) of cleavage, more preferably within 1-100 base pairs (or any value therebetween) of either side of the binding and/or cleavage site(s), even more preferably within 1 to 50 base pairs (or any value therebetween) on either side of the binding and/or cleavage site(s).
- the modification is at or near the "+58" region of the BCL11 A enhancer, for example, at or near a nuclease binding site shown in any of the first column of Table 1.
- Any cell or cell line may be modified, for example a stem cell, for example an embryonic stem cell, an induced pluripotent stem cell, a hematopoietic stem cell, a neuronal stem cell and a mesenchymal stem cell.
- a stem cell for example an embryonic stem cell, an induced pluripotent stem cell, a hematopoietic stem cell, a neuronal stem cell and a mesenchymal stem cell.
- Other non-limiting examples of cells as described herein include T-cells (e.g., CD4+, CD3+, CD8+, etc.); dendritic cells; B-cells.
- a descendent of a stem cell, including a partially or fully differentiated cell, is also provided (e.g., a RBC or RBC precursor cell).
- Non-limiting examples other cell lines including a modified BCLl 1 A sequence include COS, CHO (e.g., CHO-S, CHO-K1, CHO-DG44, CHO-DUXB11, CHO-DUKX, CHOK1 SV), VERO, MDCK, WI38, V79, B 14AF28-G3, BHK, HaK, NSO, SP2/0-Agl4, HeLa, HEK293 (e.g., HEK293-F, HEK293-H, HEK293-T), and perC6 cells as well as insect cells such as Spodopterafugiperda (Sf), or fungal cells such as Saccharomyces, Pichia and Schizosaccharomyces.
- COS COS
- CHO e.g., CHO-S, CHO-K1, CHO-DG44, CHO-DUXB11, CHO-DUKX, CHOK1 SV
- VERO MDCK
- WI38 V
- the cells as described herein are useful in treating and/or preventing a disorder, for example, by ex vivo therapies.
- the nuclease-modified cells can be expanded and then reintroduced into the patient using standard techniques. See, e.g., Tebas et al (2014) New Eng J Med 310( ⁇ 0):90 ⁇ .
- stem cells after infusion into the subject, in vivo differentiation of these precursors into cells expressing the functional transgene also occurs.
- Pharmaceutical compositions comprising the cells as described herein are also provided.
- the cells may be cryopreserved prior to administration to a patient.
- compositions such as pharmaceutical compositions comprising the genetically modified cells as described herein are also provided
- the methods and compositions disclosed herein are for modifying expression of protein, or correcting an aberrant gene sequence that encodes a protein expressed in a genetic disease, such as a sickle cell disease or a thalassemia.
- a genetic disease such as a sickle cell disease or a thalassemia.
- the methods and compositions provide for the treatment and/or prevention of such genetic diseases.
- Genome editing for example of stem cells, can be used to correct an aberrant gene, insert a wild type gene, or change the expression of an endogenous gene.
- a wild type gene e.g.
- encoding at least one globin may be inserted into a cell (e.g., into an endogenous BCLl la enhancer sequence using one or more nucleases as described herein) to provide the globin proteins deficient and/or lacking in the cell and thereby treat a genetic disease, e.g., a hemoglobinopathy, caused by faulty globin expression.
- a genetic disease e.g., a hemoglobinopathy
- genomic editing with or without administration of the appropriate donor can correct the faulty endogenous gene, e.g., correcting the point mutation in a- or ⁇ -hemoglobin, to restore expression of the gene and/or treat a genetic disease, e.g. sickle cell disease and/or knock out or alteration (overexpression or repression) of any direct or indirect globin regulatory gene (e.g. inactivation of the ⁇ globin-regulating gene BCL11 Aor the BCL11 A-regulator KLF1).
- a genetic disease e.g. sickle cell disease and/or knock out or alteration (overexpression or repression) of any direct or indirect globin regulatory gene (e.g. inactivation of the ⁇ globin-regulating gene BCL11 Aor the BCL11 A-regulator KLF1).
- a genetic disease e.g. sickle cell disease and/or knock out or alteration (overexpression or repression) of any direct or indirect globin regulatory gene (e.g. inactivation
- the nucleases of the invention are targeted to the BCL11 A enhancer region, known to be required for the expression of BCL11 A, and hence the down regulation of gamma globin expression. Modification of this enhancer region may result in erythrocytes with increased gamma globin expression, and thus may be helpful for the treatment or prevention of sickle cell disease or beta thalassemia.
- nuclease comprises a zinc finger nuclease (ZFN).
- ZFN zinc finger nuclease
- TtAgo and CRISPR/Cas systems homing endonucleases (meganucleases) with engineered DNA-binding domains and/or fusions of naturally occurring of engineered homing endonucleases (meganucleases) DNA-binding domains and heterologous cleavage domains and/or fusions of meganucleases and TALE proteins.
- ZFNs were assembled against the human BCL11 A gene and were tested by CELl assays as described in Miller et al. (2007) Nat. Biotechnol. 25:778- 785. ZFNs specific for the +58 region of the enhancer region were made as described. The nucleases are shown below in Table 1 :
- Table 1 ZFN pairs specific for +58 BCL11A enhancer region
- Table 2a Matrix screen in K562 cells (25 ng each ZFN)
- Table 2b Matrix screen in K562 cells (25 ng left ZFN, 5 ng right ZFN)
- the ZFNs were also constructed using four different linkers between the DNA binding domain and the nuclease domain (see United States Patent
- linker sequences tested are shown below, where the 'HTKIH' portion of the sequence is the carboxy terminus of the DNA binding domain and the 'ELEEK' portion is the amino terminus of the nuclease domain.
- the underlined portion is the linker sequence between the two domains:
- L7a HTKIH LRGSQLVKSKSEAAAR ELEEK SEQ ID NO: 31
- L7c5 HTKIH LRGS ISRARPLNPHP ELEEK SEQ ID NO: 32
- L0 HTKIH LRGS ISRARPLNPHP ELEEK SEQ ID NO: 33
- L8c4 HTKIH LRGSYAPMPPLALASP ELEEK SEQ ID NO: 34
- ZFNs as described herein were also tested in human CD34+ cells.
- a BTX ECM830 device with a 2 mm gap cuvette was used for the CD34+ transduction.
- Human CD34+ cells were grown in x-vivolO media (Lonza) with lxCCl 10 (Stem cell Technology) in non-tissue culture treated plates. The cells were counted and collected by centrifugation at 1200 rpm for 10 minutes at room temperature. The cells were washed l-2x with room temperature PBS. 200,000 cells were used for each transfection, and they were resuspended in 100 [iL BTexpress solution.
- RNAs encoding the ZFNs was used rather than DNA.
- the cells were then were subject to genome analysis using an Illumina MiSeq.
- the genomic region of interest was PCR amplified using primers which add the standard Illumina sequencing adapter sequences.
- a second group of 13 rounds of PCR was performed to add barcode and bridge adapter sequences to both ends.
- Sequencing was performed on an Illumina MiSeq according to manufacturer's protocols for amplicon sequencing.
- the MiSeq generates paired-end reads, which are merged and adapter-trimmed using a standard alignment software. Reads were then
- CD34 + cells were purified using Ficoll-Paque (GE Healthcare) and CD34 T microbeads (Miltenyi Biotec) according to the manufacturers' instructions.
- CD34 + cells were cultured in Iscove's MDM with BIT 95000 (StemCell Technologies) in the presence of growth factors. Cells were differentiated toward the erythroid lineage using a 3 step liquid culture model. During the first 6 days (first phase), CD34 + cells were expanded with SCF (100 ng/ml), Flt3-L (100 ng/ml), and IL-3 (20 ng/ml).
- Expanded cells were then committed and differentiated toward the erythroid lineage (second phase) with Epo (2 U/ml) and SCF (50 ng/ml). See, Giarratana et al. (2011) BloodX 18(19):5071-9.
- the ratios of mRNAs encoding gamma globin, alpha globin and beta globin following ZFN treatment were determined at 14 days after the start of differentiation by RT-PCR analysis. The analysis was done by standard Taqman® analysis, following the protocol and using gene specific assays supplied by the manufacturer (Applied Biosystems). The relative levels of gamma globin (HBG) was normalized by the level of alpha (HBA) or beta globin (HBB) expression where the ratio was compared to the gamma/alpha or gamma/beta ratio in control cells.
- HBA level of alpha
- HBB beta globin
- Example 5 Activity of ZFN in CD34+ cells using a BTX electroporation device, separate mRNAs and single mRNAs
- CD34+ cells were isolated from healthy donors as follows. Leukapheresis collections were platelet depleted by low speed centrifugation and supernatant removal. Following platelet depletion, the cells were labelled with anti-CD34 magnetic micro-beads (Miltenyi Biotec, Germany) and positively selected using the Miltenyi CliniMACS Plus Cell Separator System.
- the positive fraction (enriched CD34+ HSPC) were washed and resuspended in culture medium (i.e., X-VIVO 10 medium supplemented with 2mM L-glutamine, 100 ng/mL each of FMS-like tyrosine kinase 3-ligand (Flt-3L), stem cell factor (SCF), and thrombopoietin (TPO)) at 1 x 106 cells/mL, and transferred into VueLife culture bags (Saint-Gobain, Gaithersburg, MD) and incubated at 37°C / 5% C02.
- culture medium i.e., X-VIVO 10 medium supplemented with 2mM L-glutamine, 100 ng/mL each of FMS-like tyrosine kinase 3-ligand (Flt-3L), stem cell factor (SCF), and thrombopoietin (TPO)
- CD34+ cells For purification of CD34+ cells from bone marrow, collections were depleted of red blood cells (RBC) by hydroxyethyl starch sedimentation. Following RBC depletion, the cells were labelled with anti-CD34 magnetic micro-beads (Miltenyi Biotec, Germany) and positively selected using the Miltenyi CliniMACS Prodigy.
- RBC red blood cells
- the positive fraction (enriched CD34+ HSPC) were washed and resuspended in culture medium (i.e., X-VIVO 10 medium supplemented with 2mM L-glutamine, 100 ng/mL each of FMS-like tyrosine kinase 3-ligand (Flt-3L), stem cell factor (SCF), and thrombopoietin (TPO)) at 1 x 106 cells/mL, and transferred into VueLife culture bags (Saint-Gobain, Gaithersburg, MD) and incubated at 37°C / 5% C02.
- culture medium i.e., X-VIVO 10 medium supplemented with 2mM L-glutamine, 100 ng/mL each of FMS-like tyrosine kinase 3-ligand (Flt-3L), stem cell factor (SCF), and thrombopoietin (TPO)
- the ZFNs were tested as mRNA introduced into the cells.
- a BTX device was used for transfection. Briefly, 200,000 cells per sample were suspended in
- BTXpress Electroporation solution BTX
- RNA RNA
- the mixture was then pulsed for 4 msec at 250 volts and subjected to cold shock conditions (30°C overnight) prior to letting the cells recover at 37°C.
- Analysis of ZFN activity was carried out two or three days post- transfection.
- the ZFNs were tested as single mRNA species, where a 2a self-cleaving peptide sequence was used between the two ZFN coding sequences, and the data is presented in Figure 2.
- the same conditions were used to test 1 pair of ZFN where the provision of the mRNAs was as two separate species, where each mRNA encoded a single ZFN.
- Table 10a and Table 10b below shows the activity results (%NHEJ or indels) for the single mRNA approach versus two mRNAs (data depicted is from several experiments).
- Table 10a Comparison of single versus double mRNA species (% indels)
- the capture assay is based on the observation that co-introduction of a nuclease and a duplex DNA donor into a target cell results in the "capture" of donor into a fraction of the resultant genomic break sites via the NHEJ DNA repair pathway (Orlando et al, (2010) Nucleic Acids Res. 38(15) el52; Gabriel, R. et al. (2011). Nat Biotechnol. 29: 816-23.). Note that this capture event is not homology driven (indeed the duplex DNA donor does not contain any homology to the human genome). Note further that the mRNA encoding the ZFNs cannot be captured into the DNA break, solely the duplex DNA donor can.
- duplex genome represents a permanent tag of the cleavage event.
- sites of capture may be identified via primer extension from the donor into flanking genome sequence, followed by adapter ligation, PCR, and sequencing of the resulting donor- genome junctions.
- the capture analysis studies were conducted in the K562 cell line to maximize donor delivery, ZFN expression, and donor capture into DSB sites; the cells were electroporated with the ZFN-encoding mRNA and the oligonucleotide duplex donor. Separately, BM and PB-derived CD34+ cells were electroporated using the Maxcyte device as described above with the ZFN-encoding mRNA.
- duplex donor oligonucleotide used is shown below (SEQ ID NOs: 30 and 31): [0199]
- the NNNN at the 5' end of each strand indicates a random, single strand tetramer overhang, while the underlined NNNN indicates random duplex sequence that served as a bar code to differentiate between otherwise identical integration events.
- Triplicate samples were prepared for each combination of oligo and mRNA. On days 7 and 14 post-transfection genomic DNA was isolated (Qiagen DNeasy Blood and Tissue Kit), and 1 ⁇ g (330000 genomes / replicate) was used as input for the amplification protocol. Samples were then processed essentially as described (Paruzynski, A. et al. (2010). Nat. Protocols.
- Amplicons were purified using a QIAquick PCR Purification Kit (Qiagen), and amplified by PCR to introduce barcodes and adapters for deep sequencing on the Illumina platform. Final products were quantified, pooled and sequenced on a MiSeq Instrument (Illumina) using a v2 300 cycle sequencing kit with paired-end 150 bp reads and 8 bp dual index reads to detect the barcodes on each end of the amplicon.
- QiAquick PCR Purification Kit Qiagen
- Final products were quantified, pooled and sequenced on a MiSeq Instrument (Illumina) using a v2 300 cycle sequencing kit with paired-end 150 bp reads and 8 bp dual index reads to detect the barcodes on each end of the amplicon.
- Example 6 Activity of ZFN in CD34+ cells using a Maxcyte electroporation device, separate mRNAs and single mRNAs
- Example 7 Engraftment of edited human CD34+ cells in mice [0203] As described above, CD34+ human cells are treated with mRNAs encoding the +58 enhancer specific ZFNs and then engrafted into NSG mice. CD34+ cells are obtained from healthy human volunteers. In some cases, CD34+
- G-CSF Neurogen®
- G-CSF + Plerixafor Mozobil®
- the G-CSF is administered daily for the four days prior to apheresis according to manufacturer's instructions, and if Plerixafor was used, it was administered on the final evening prior to harvest, again according to manufacturer's instructions.
- the apheresis is performed by standard methods.
- CD34+ cells were enriched from the mobilized PBMC leukopaks using a Miltenyi
- Capped and poly-adenylated mRNAs encoding the ZFNs are synthesized using Ambion mMessage mMachine® T7 ultra kit as instructed by the manufacturer and then electroporated into the CD34+ cells using either a Maxcyte GT system or a BTX ECM830 electroporator, both according to manufacturer's instructions.
- NOD.Cg-iWc ⁇ Il2rg tmlWjl /SzJ mice are used to receive the CD34+ transplant.
- the ZFN-treated CD34+ cells from above are transplanted into the irradiated mice through a tail vein injection, where 1 million cells in 0.5 mL PBS-0.1%BSA were given per mouse.
- CD34+ cells are electroporated with mRNAs encoding the 46801/47923 pair.
- Genes encoding the ZFNs are cloned together in a single open reading frame separated by a sequence encoding a 2A self-cleaving peptide.
- GFP was used as a control. Following transplantation into the mice, samples are taken at either 4, 8 and 12 weeks post-transplant to observe the level of human cell specific marking in cells.
- Example 8 Activity of ZFNs in patient derived cells
- Transfections used either 4 ⁇ g of green fluorescent protein (GFP) encoding mRNA (as a control for electroporation efficiency, and to control for nonspecific effects of electroporation itself, and for nonspecific effects of introducing mRNA into the cells), or 4 ⁇ g and 8 ⁇ g of SB 51857- 2a-51949 mRNA.
- GFP green fluorescent protein
- BCL11 A gene modification was measured by MiSeq deep sequencing 72 hours after electroporation, at the time when the in vitro differentiation was started (therefore d3 post-transfection was dO of the differentiation) and at day 14 of the erythroid differentiation. The results are shown in Table 13.
- CD34+ HSPC from subjects with ⁇ thalassemia showed an increase in fetal ( ⁇ ) globin levels following treatment with SB ZFN mRNA when analyzed by RT qPCR ( Figure 11). Fetal ⁇ globin mRNA levels are shown normalized relative to a globin mRNA since the thalassemia cells expressed low or no ⁇ globin mRNA.
- Erythroid progeny of CD34+ HSPCs from subjects with ⁇ thalassemia treated with SB ZFN mRNA reveal the anticipated increase in the ratio of fetal ( ⁇ ) globin mRNA to a globin mRNA, reaching gamma-globin to alpha-globin ratios similar to those seen in the wild type donor cells, in particular in the patient samples that showed good viability after thawing and consequently target gene modification levels comparable to those in wild type cells.
- Reverse phase FIPLC was then used to determine whether modification of the BCL11 A erythroid enhancer elevates fetal hemoglobin at the protein level.
- Example 9 Analysis of modified allele distribution and effect on fetal globin in ZFN treated wild type CD34+ cells.
- erythroid cells derived from CD34+ cells treated with SB ZFN at the single cell level with respect to two endpoints: (1) distribution of alleles of BCLl 1 A erythroid enhancer region rated by the action of the ZFNs between individual cells, and (2) effect of the distribution of individual alleles (wild type and genetically modified) on levels of fetal globin (as gauged by the ⁇ / ⁇ globin mRNA ratio).
- SB ZFN HSPC single CD34+ cells found in SB ZFN HSPC were sorted and
- Step 1 erythroid culture media consisted of Glutamax containing Iscove's Modified Dulbecco's Medium (FMDM) supplemented with 100 U/mL penicillin, 100 ⁇ g/mL streptomycin, 5% human AB+ plasma, 330 ⁇ g/mL human holo transferrin, 20 ⁇ g/mL human insulin, 2 U/mL heparin, 3 U/mL recombinant human erythropoietin, 100 ng/mL SCF, 5 ng/mL IL 3, and 1 ⁇ /mL hydrocortisone.
- FMDM Iscove's Modified Dulbecco's Medium
- Step 1 After 7 days of culture at 37°C, 5% C02 in Step 1 erythroid culture media, 150 ⁇ L of media per well was removed and replaced with 100 ⁇ L Step 2 erythroid culture media, which was similar to Step 1 media but without the addition of IL 3 and hydrocortisone. After 4 additional days of culture, 100 ⁇ L media per well was removed and replaced with 100 ⁇ . Step 3 media, which was similar to Step 2 media but without SCF.
- Step 3 media Remaining cells were cultured for 3 more days when 50 ⁇ . of cell suspension per well was collected, stained with an equal volume of NucRed (2 drop/mL in PBS 0.5% BSA), and enumerated on Guava easyCyte for cellularity and enucleation rate. Remaining cells were spun down, wash once with PBS, and lysed in 20 ⁇ . high performance liquid chromatography- (FIPLC) grade water. Cell debris was removed by centrifugation (10,000 x g, 15 min, 4°C). Hemolysate was stored at 70°C until ready for globin chain analysis by reverse phase ultra performance liquid chromatography (UPLC).
- UPLC reverse phase ultra performance liquid chromatography
- the region of interest (containing the ZFN binding site within the BCLl 1 A erythroid enhancer region) is polymerase chain reaction- (PCR) amplified and the level of modification is determined by paired end deep sequencing on an Illumina MiSeq.
- PCR polymerase chain reaction-
- adaptors, barcodes, and flow cell binder (short DNA sequence) were attached to the target specific amplicons using two sets of fusion primers in sequential polymerase chain reactions.
- PRJIYLFN f 5' ACACGACGCTCTTCCGATCTNNNNAGTCCTCTTCTACCCCACC (SEQ ID NO: 35) and PRJIYLFN r:
- SB ZFN 120 or 80 ⁇ g/ml SB ZFN was transfected into CD34+ cells to generate SB ZFN HSPC cells and cell samples were collected at three days post transfection and analyzed for the levels of BCL11 A erythroid enhancer region disruption by deep sequencing. This revealed approximately 67% modified BCL11 A alleles in the SB ZFN transfected sample for experiment 1 and 58% for experiment 2 (Table 14).
- HSPC from two different experiments (1 and 2) were sorted and plated in 96 well plates and underwent erythroid differentiation in vitro, and individual single cell cultures were analyzed by high throughput DNA sequencing as well as globin expression analysis by UPLC, respectively.
- BCLl 1 A erythroid enhancer modification was made up of 28-36% wild type cells, 11-14%) cells bearing a monoallelic modification, and 52-58%> cells bearing biallelic modification of the target locus.
- a fraction of the disrupted alleles of the BCLl 1 A erythroid enhancer may retain partial or complete function, potentially as a result of retaining a GAT A 1 binding site (Vierstra et al (2015) Nat Methods. 12(10): 927-30; Canver et al (2015) Nature 527(7577): 192-7).
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AU2022204863A1 (en) | 2022-07-28 |
IL255288A0 (en) | 2017-12-31 |
US10808020B2 (en) | 2020-10-20 |
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WO2016183298A3 (en) | 2016-12-29 |
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JP6873917B2 (en) | 2021-05-19 |
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CA2984013A1 (en) | 2016-11-17 |
JP2021106611A (en) | 2021-07-29 |
MX2017014446A (en) | 2018-06-13 |
IL284707A (en) | 2021-08-31 |
JP7365374B2 (en) | 2023-10-19 |
AU2016261927B2 (en) | 2022-04-07 |
US20210024606A1 (en) | 2021-01-28 |
KR20170141217A (en) | 2017-12-22 |
ZA201707016B (en) | 2019-08-28 |
US20180111975A1 (en) | 2018-04-26 |
IL284707B2 (en) | 2024-01-01 |
HK1251011A1 (en) | 2019-01-18 |
SG10202112057QA (en) | 2021-12-30 |
SA517390307B1 (en) | 2021-07-13 |
AU2016261927A1 (en) | 2017-11-02 |
IL255288B (en) | 2021-10-31 |
CO2017012026A2 (en) | 2018-02-28 |
EP3294866A2 (en) | 2018-03-21 |
MX2021005226A (en) | 2021-06-18 |
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