Patent Application
20230346979
The contents of the text file submitted electronically herewith are incorporated herein by reference in their entirety: A computer readable format copy of the Sequence Listing (filename: PRVL_016_01WO_SeqList.txt, date recorded: Aug. 10, 2021, file size ˜612,834 bytes).
The disclosure relates to the field of gene therapy and methods of using same.
Gaucher disease is a rare inborn error of glycosphingolipid metabolism due to deficiency of lysosomal acid β-glucocerebrosidase (Gcase, “GBA”). Patients suffer from non-CNS symptoms and findings including hepatosplenomegaly, bone marrow insufficiency leading to pancytopenia, lung disorders and fibrosis, and bone defects. In addition, a significant number of patients suffer from neurological manifestations, including defective saccadic eye movements and gaze, seizures, cognitive deficits, developmental delay, and movement disorders including Parkinson's disease. Several therapeutics exist that address the peripheral disease and the principal clinical manifestations in hematopoietic bone marrow and viscera, including enzyme replacement therapies as described below, chaperone-like small molecule drugs that bind to defective Gcase and improve stability, and substrate reduction therapy that block the production of substrate that accumulate in Gaucher disease leading to symptoms and findings. However, other aspects of Gaucher disease (particularly those affecting the skeleton and brain) appear refractory to treatment.
Progranulin (PGRN) is an additional protein linked to lysosomal function. PGRN is encoded by the GRN gene. GRN haploinsufficiency in humans leads to an approximately 90% risk of developing FTD-GRN (fronto-temporal dementia with GRN mutation), a neurodegenerative disease characterized by impairment of executive function, changes in behavior, and language difficulties, accompanied by atrophy of the frontal and temporal lobes. No disease-modifying therapies are available for patients with FTD.
Provided herein is a method for treating a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising administering to the subject: a recombinant adeno-associated virus (rAAV) comprising:
Further provided herein is a method for suppressing an immune response in a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising administering to the subject:
In some embodiments of the methods provided herein, the promoter is a chicken beta actin (CBA) promoter. In some embodiments of the methods provided herein, the rAAV vector further comprises a cytomegalovirus (CMV) enhancer. In some embodiments of the methods provided herein, the rAAV vector further comprises a Woodchuck Hepatitis Virus Posttranscriptional Regulatory Element (WPRE). In some embodiments of the methods provided herein, the rAAV vector further comprises a Bovine Growth Hormone polyA signal tail.
In some embodiments of the methods provided herein, the nucleic acid comprises two adeno-associated virus inverted terminal repeats (ITR) sequences flanking the expression construct. In some embodiments of the methods provided herein, each ITR sequence is an AAV2 ITR sequence.
In some embodiments of the methods provided herein, the rAAV vector further comprises a TRY region between the 5′ ITR and the expression construct, wherein the TRY region comprises SEQ ID NO: 28.
Provided herein is a method for treating a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising administering to the subject: a recombinant adeno-associated virus (rAAV) comprising:
Further provided herein is a method for suppressing an immune response in a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising administering to the subject:
In some embodiments of the methods provided herein, the rAAV is administered via an injection into the cisterna magna.
In some embodiments of the methods provided herein, the rAAV is administered to the subject at a dose ranging from about 1×1013 vector genomes (vg) to about 7×1014 vg. In some embodiments of the methods provided herein, the rAAV is administered to the subject at a dose of about 3.5×1013 vg, about 7.0×1013 vg or about 1.4×1014 vg.
In some embodiments of the methods provided herein, the rAAV is administered in a formulation comprising about 20 mM Tris, pH 8.0, about 1 mM MgCl2, about 200 mM NaCl, and about 0.001% w/v poloxamer 188.
In some embodiments of the methods provided herein, the methylprednisolone is administered intravenously at a dose of about 1000 mg either one day before or on the same day as administration of the rAAV.
In some embodiments of the methods provided herein, the prednisone is administered orally (A) at a dose of about 30 mg per day for 14 days beginning on the day after the administration of about 1000 mg of the methylprednisolone; and (B) tapered during the 7 days following the end of the 14-day period of (A).
In some embodiments of the methods provided herein, the rituximab is administered intravenously at a dose of about 1000 mg on any single day between 14 days before and 1 day before administration of the rAAV.
In some embodiments of the methods provided herein, the methylprednisolone is administered before the rituximab is administered. In some embodiments of the methods provided herein, the methylprednisolone is administered at least about 30 minutes before the rituximab is administered. In some embodiments of the methods provided herein, the methylprednisolone and the rituximab are both administered the day before administration of the rAAV; and the methylprednisolone is administered at least about 30 minutes before the rituximab is administered. In some embodiments of the methods provided herein, the rituximab is administered on any single day between 14 days before and 2 days before administration of the rAAV; and the methylprednisolone is administered intravenously at a dose of about 100 mg at least about 30 minutes before the rituximab is administered on the same day as the rituximab is administered.
In some embodiments of the methods provided herein, the sirolimus is administered orally (A) as a single dose of about 6 mg three days, two days or one day before administration of the rAAV; and (B) at a dose of about 2 mg per day to maintain serum trough levels of from about 4 ng/ml to about 9 ng/mL for about 90 days after administration of the rAAV; wherein the first dose of about 2 mg per day of the sirolimus is administered the day after the single dose of about 6 mg of the sirolimus. In some embodiments of the methods provided herein, the sirolimus administration is tapered during the 15 days to 30 days following the end of the 90-day period after administration of the rAAV.
In some embodiments of the methods provided herein, the method comprises:
In some embodiments of the methods provided herein, the method comprises:
In some embodiments of the methods provided herein, the immune response is an immune response to the rAAV. In some embodiments of the methods provided herein, the immune response is a T cell response. In some embodiments of the methods provided herein, the immune response is a B cell response. In some embodiments of the methods provided herein, the immune response is an antibody response. In some embodiments of the methods provided herein, the immune response is pleocytosis. In some embodiments of the methods provided herein, the pleocytosis is cerebrospinal fluid (CSF) pleocytosis. In some embodiments of the methods provided herein, the immune response is an abnormal level of CSF protein.
In some embodiments of the methods provided herein, an additional immunosuppressant that is not sirolimus, methylprednisolone, rituximab or prednisone is further administered to the subject.
Provided herein is a therapeutic combination of a recombinant adeno-associated virus (rAAV) comprising:
Further provided herein is a therapeutic combination of a recombinant adeno-associated virus (rAAV) comprising:
In some embodiments, a therapeutic combination provided herein comprises from about 1×1013 vg to about 7×1014 vg of the rAAV. In some embodiments, a therapeutic combination provided herein comprises about 3.5×1013 vg, about 7.0×1013 vg or about 1.4×1014 vg of the rAAV.
The disclosure relates to gene therapies for fronto-temporal dementia (FTD). In particular, the disclosure is related to an immunosuppression regimen administered in combination with a recombinant adeno-associated virus (rAAV) delivering a functional copy of the GRN gene encoding progranulin. An immunosuppression regimen is needed to reduce the risk of immune-related adverse events in a subject being treated with gene therapy.
The disclosure is based, in part, on compositions and methods for expression of combinations of certain gene products (e.g., gene products associated with CNS disease) in a subject. A gene product can be a protein, a fragment (e.g., portion) of a protein, an interfering nucleic acid that inhibits a CNS disease-associated gene, etc. In some embodiments, a gene product is a protein or a protein fragment encoded by a CNS disease-associated gene. In some embodiments, a gene product is an interfering nucleic acid (e.g., shRNA, siRNA, miRNA, amiRNA, etc.) that inhibits a CNS disease-associated gene.
A CNS disease-associated gene refers to a gene encoding a gene product that is genetically, biochemically or functionally associated with a CNS disease, such as FTD or PD (Parkinson's disease). For example, individuals having a pathogenic mutation in the GRNgene (which encodes the protein PGRN (progranulin)) have an increased risk of developing FTD compared to individuals that do not have a mutation in GRN. Similarly, individuals having mutations in the GBA1 gene (which encodes the protein Gcase), have been observed to be have an increased risk of developing PD compared to individuals that do not have a mutation in GBA1. In another example, PD is associated with accumulation of protein aggregates comprising α-Synuclein (α-Syn) protein; accordingly, SNCA (which encodes α-Syn) is a PD-associated gene. In some embodiments, an expression cassette described herein encodes a wild-type or non-mutant form of a CNS disease-associated gene (or coding sequence thereof). Examples of CNS disease-associated genes are listed in Table 1.
In addition to Gaucher disease patients (who possess mutations in both chromosomal alleles of GBA1 gene), patients with mutations in only one allele of GBA1 are at highly increased risk of Parkinson's disease (PD). The severity of PD symptoms—which include gait difficulty, a tremor at rest, rigidity, and often depression, sleep difficulties, and cognitive decline-correlate with the degree of enzyme activity reduction. Thus, Gaucher disease patients have the most severe course, whereas patient with a single mild mutation in GBA1 typically have a more benign course. Mutation carriers are also at high risk of other PD-related disorders, including Lewy Body Dementia, characterized by executive dysfunction, psychosis, and a PD-like movement disorder, and multi-system atrophy, with characteristic motor and cognitive impairments. No therapies exist that alter the inexorable course of these disorders.
Deficits in enzymes such as Gcase (e.g., the gene product of GBA1 gene), as well as common variants in many genes implicated in lysosome function or trafficking of macromolecules to the lysosome (e.g., Lysosomal Membrane Protein 1 (LIMP), also referred to as SCARB2), have been associated with increased PD risk and/or risk of Gaucher disease (e.g., neuronopathic Gaucher disease, such as Type 2 Gaucher disease or Type 3 Gaucher disease). The disclosure is based, in part, on expression constructs (e.g., vectors) encoding one or more genes, for example Gcase, GBA2, prosaposin, progranulin (PGRN), LIMP2, GALC, CTSB, SMPD1, GCH1, RAB7, VPS35, IL-34, TREM2, TMEM106B, or a combination of any of the foregoing (or portions thereof), associated with central nervous system (CNS) diseases, for example Gaucher disease, PD, etc. In some embodiments, combinations of gene products described herein act together (e.g., synergistically) to reduce one or more signs and symptoms of a CNS disease when expressed in a subject.
Accordingly, in some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding a Gcase (e.g., the gene product of GBA1 gene). In some embodiments, the isolated nucleic acid comprises a Gcase-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells). In some embodiments, the nucleic acid sequence encoding the Gcase encodes a protein comprising an amino acid sequence as set forth in SEQ ID NO: 14 (e.g., as set forth in NCBI Reference Sequence NP_000148.2). In some embodiments, the isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 15. In some embodiments the expression construct comprises adeno-associated virus (AAV) inverted terminal repeats (ITRs), for example AAV ITRs flanking the nucleic acid sequence encoding the Gcase protein.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding Prosaposin (e.g., the gene product of PSAP gene). In some embodiments, the isolated nucleic acid comprises a prosaposin-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells). In some embodiments, the nucleic acid sequence encoding the prosaposin encodes a protein comprising an amino acid sequence as set forth in SEQ ID NO: 16 (e.g., as set forth in NCBI Reference Sequence NP_002769.1). In some embodiments, the isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 17. In some embodiments the expression construct comprises adeno-associated virus (AAV) inverted terminal repeats (ITRs), for example AAV ITRs flanking the nucleic acid sequence encoding the prosaposin protein.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding LIMP2/SCARB2 (e.g., the gene product of SCARB2 gene). In some embodiments, the isolated nucleic acid comprises a SCARB2-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells). In some embodiments, the nucleic acid sequence encoding the LIMP2/SCARB2 encodes a protein comprising an amino acid sequence as set forth in SEQ ID NO: 18 (e.g., as set forth in NCBI Reference Sequence NP_005497.1). In some embodiments, the isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 29. In some embodiments the expression construct comprises adeno-associated virus (AAV) inverted terminal repeats (ITRs), for example AAV ITRs flanking the nucleic acid sequence encoding the SCARB2 protein.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding GBA2 protein (e.g., the gene product of GBA2 gene). In some embodiments, the isolated nucleic acid comprises a GBA2-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells). In some embodiments, the nucleic acid sequence encoding the GBA2 encodes a protein comprising an amino acid sequence as set forth in SEQ ID NO: 30 (e.g., as set forth in NCBI Reference Sequence NP_065995.1). In some embodiments, the isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 31. In some embodiments the expression construct comprises adeno-associated virus (AAV) inverted terminal repeats (ITRs), for example AAV ITRs flanking the nucleic acid sequence encoding the GBA2 protein.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding GALC protein (e.g., the gene product of GALC gene). In some embodiments, the isolated nucleic acid comprises a GALC-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells). In some embodiments, the nucleic acid sequence encoding the GALC encodes a protein comprising an amino acid sequence as set forth in SEQ ID NO: 33 (e.g., as set forth in NCBI Reference Sequence NP_000144.2). In some embodiments, the isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 34. In some embodiments the expression construct comprises adeno-associated virus (AAV) inverted terminal repeats (ITRs), for example AAV ITRs flanking the nucleic acid sequence encoding the GALC protein.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding CTSB protein (e.g., the gene product of CTSB gene). In some embodiments, the isolated nucleic acid comprises a CTSB-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells). In some embodiments, the nucleic acid sequence encoding the CTSB encodes a protein comprising an amino acid sequence as set forth in SEQ ID NO: 35 (e.g., as set forth in NCBI Reference Sequence NP_001899.1). In some embodiments, the isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 36. In some embodiments the expression construct comprises adeno-associated virus (AAV) inverted terminal repeats (ITRs), for example AAV ITRs flanking the nucleic acid sequence encoding the CTSB protein.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding SMPD1 protein (e.g., the gene product of SMPD1 gene). In some embodiments, the isolated nucleic acid comprises a SMPD1-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells). In some embodiments, the nucleic acid sequence encoding the SMPD1 encodes a protein comprising an amino acid sequence as set forth in SEQ ID NO: 37 (e.g., as set forth in NCBI Reference Sequence NP_000534.3). In some embodiments, the isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 38. In some embodiments the expression construct comprises adeno-associated virus (AAV) inverted terminal repeats (ITRs), for example AAV ITRs flanking the nucleic acid sequence encoding the SMPD1 protein.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding GCH1 protein (e.g., the gene product of GCH1 gene). In some embodiments, the isolated nucleic acid comprises a GCH1-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells). In some embodiments, the nucleic acid sequence encoding the GCH1 encodes a protein comprising an amino acid sequence as set forth in SEQ ID NO: 45 (e.g., as set forth in NCBI Reference Sequence NP_000534.3). In some embodiments, the isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 46. In some embodiments the expression construct comprises adeno-associated virus (AAV) inverted terminal repeats (ITRs), for example AAV ITRs flanking the nucleic acid sequence encoding the GCH1 protein.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding RAB7L protein (e.g., the gene product of RAB7L gene). In some embodiments, the isolated nucleic acid comprises a RAB7L-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells). In some embodiments, the nucleic acid sequence encoding the RAB7L encodes a protein comprising an amino acid sequence as set forth in SEQ ID NO: 47 (e.g., as set forth in NCBI Reference Sequence NP_003920.1). In some embodiments, the isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 48. In some embodiments the expression construct comprises adeno-associated virus (AAV) inverted terminal repeats (ITRs), for example AAV ITRs flanking the nucleic acid sequence encoding the RAB7L protein.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding VPS35 protein (e.g., the gene product of VPS35 gene). In some embodiments, the isolated nucleic acid comprises a VPS35-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells). In some embodiments, the nucleic acid sequence encoding the VPS35 encodes a protein comprising an amino acid sequence as set forth in SEQ ID NO: 49 (e.g., as set forth in NCBI Reference Sequence NP_060676.2). In some embodiments, the isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 50. In some embodiments the expression construct comprises adeno-associated virus (AAV) inverted terminal repeats (ITRs), for example AAV ITRs flanking the nucleic acid sequence encoding the VPS35 protein.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding TL-34 protein (e.g., the gene product of IL34 gene). In some embodiments, the isolated nucleic acid comprises a TL-34-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells). In some embodiments, the nucleic acid sequence encoding the TL-34 encodes a protein comprising an amino acid sequence as set forth in SEQ ID NO: 55 (e.g., as set forth in NCBI Reference Sequence NP_689669.2). In some embodiments, the isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 56. In some embodiments the expression construct comprises adeno-associated virus (AAV) inverted terminal repeats (ITRs), for example AAV ITRs flanking the nucleic acid sequence encoding the IL-34 protein.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding TREM2 protein (e.g., the gene product of TREMgene). In some embodiments, the isolated nucleic acid comprises a TREM2-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells). In some embodiments, the nucleic acid sequence encoding the TREM2 encodes a protein comprising an amino acid sequence as set forth in SEQ ID NO: 57 (e.g., as set forth in NCBI Reference Sequence NP_061838.1). In some embodiments, the isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 58. In some embodiments the expression construct comprises adeno-associated virus (AAV) inverted terminal repeats (ITRs), for example AAV ITRs flanking the nucleic acid sequence encoding the TREM2 protein.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding TMEM106B protein (e.g., the gene product of TMEM106B gene). In some embodiments, the isolated nucleic acid comprises a TMEM106B-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells). In some embodiments, the nucleic acid sequence encoding the TMEM106B encodes a protein comprising an amino acid sequence as set forth in SEQ ID NO: 63 (e.g., as set forth in NCBI Reference Sequence NP_060844.2). In some embodiments, the isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 64. In some embodiments the expression construct comprises adeno-associated virus (AAV) inverted terminal repeats (ITRs), for example AAV ITRs flanking the nucleic acid sequence encoding the TMEM106B protein.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding progranulin (e.g., the gene product of PGRN gene). In some embodiments, the isolated nucleic acid comprises a prosaposin-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells). In some embodiments, the nucleic acid sequence encoding the progranulin (PGRN) encodes a protein comprising an amino acid sequence as set forth in SEQ ID NO: 67 (e.g., as set forth in NCBI Reference Sequence NP_002078.1). In some embodiments, the isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 68. In some embodiments the expression construct comprises adeno-associated virus (AAV) inverted terminal repeats (ITRs), for example AAV ITRs flanking the nucleic acid sequence encoding the prosaposin protein.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding a first gene product and a second gene product, wherein each gene product independently is selected from the gene products, or portions thereof, set forth in Table 1.
In some embodiments, a first gene product or a second gene product is a Gcase protein, or a portion thereof. In some embodiments, a first gene product is a Gcase protein and a second gene product is selected from GBA2, prosaposin, progranulin, LIMP2, GALC, CTSB, SMPD1, GCH1, RAB7, VPS35, IL-34, TREM2, and TMEM106B.
In some embodiments, an expression construct encodes (e.g., alone or in addition to another gene product) an interfering nucleic acid (e.g., shRNA, miRNA, dsRNA, etc.). In some embodiments, an interfering nucleic acid inhibits expression of α-Synuclein (α-Synuclein). In some embodiments, an interfering nucleic acid that targets α-Synuclein comprises a sequence set forth in any one of SEQ ID NOs: 20-25. In some embodiments, an interfering nucleic acid that targets α-Synuclein binds to (e.g., hybridizes with) a sequence set forth in any one of SEQ ID NO: 20-25.
In some embodiments, an interfering nucleic acid inhibits expression of TMEM106B. In some embodiments, an interfering nucleic acid that targets TMEM106B comprises a sequence set forth in SEQ ID NO: 64 or 65. In some embodiments, an interfering nucleic acid that targets TMEM106B binds to (e.g., hybridizes with) a sequence set forth in SEQ ID NO: 64 or 65.
In some embodiments, an expression construct further comprises one or more promoters. In some embodiments, a promoter is a chicken-beta actin (CBA) promoter, a CAG promoter, a CD68 promoter, or a JeT promoter. In some embodiments, a promoter is a RNA pol II promoter (e.g., or an RNA pol III promoter (e.g., U6, etc.).
In some embodiments, an expression construct further comprises an internal ribosomal entry site (IRES). In some embodiments, an IRES is located between a first gene product and a second gene product.
In some embodiments, an expression construct further comprises a self-cleaving peptide coding sequence. In some embodiments, a self-cleaving peptide is a T2A peptide.
In some embodiments, an expression construct comprises two adeno-associated virus (AAV) inverted terminal repeat (ITR) sequences. In some embodiments, ITR sequences flank a first gene product and a second gene product (e.g., are arranged as follows from 5′-end to 3′-end: ITR-first gene product-second gene product-ITR). In some embodiments, one of the ITR sequences of an isolated nucleic acid lacks a functional terminal resolution site (trs). For example, in some embodiments, one of the ITRs is a ΔITR.
The disclosure relates, in some aspects, to rAAV vectors comprising an ITR having a modified “D” region (e.g., a D sequence that is modified relative to wild-type AAV2 ITR, SEQ ID NO: 29). In some embodiments, the ITR having the modified D region is the 5′ ITR of the rAAV vector. In some embodiments, a modified “D” region comprises an “S” sequence, for example as set forth in SEQ ID NO: 26. In some embodiments, the ITR having the modified “D” region is the 3′ ITR of the rAAV vector. In some embodiments, a modified “D” region comprises a 3′ITR in which the “D” region is positioned at the 3′ end of the ITR (e.g., on the outside or terminal end of the ITR relative to the transgene insert of the vector). In some embodiments, a modified “D” region comprises a sequence as set forth in SEQ ID NO: 26 or 27.
In some embodiments, an isolated nucleic acid (e.g., an rAAV vector) comprises a TRY region. In some embodiments, a TRY region comprises the sequence set forth in SEQ ID NO: 28.
In some embodiments, an isolated nucleic acid described by the disclosure comprises or consists of, or encodes a peptide having, the sequence set forth in any one of SEQ ID NOs: 1-91.
In some aspects, the disclosure provides a vector comprising an isolated nucleic acid as described by the disclosure. In some embodiments, a vector is a plasmid, or a viral vector. In some embodiments, a viral vector is a recombinant AAV (rAAV) vector or a Baculovirus vector. In some embodiments, an rAAV vector is single-stranded (e.g., single-stranded DNA).
In some embodiments, the disclosure provides a host cell comprising an isolated nucleic acid as described by the disclosure or a vector as described by the disclosure.
In some embodiments, the disclosure provides a recombinant adeno-associated virus (rAAV) comprising a capsid protein and an isolated nucleic acid or a vector as described by the disclosure.
In some embodiments, a capsid protein is capable of crossing the blood-brain barrier, for example an AAV9 capsid protein or an AAVrh.10 capsid protein. In some embodiments, an rAAV transduces neuronal cells and non-neuronal cells of the central nervous system (CNS).
In some aspects, the disclosure provides a method for treating a subject having or suspected of having or suspected of having a central nervous system (CNS) disease, the method comprising administering to the subject a composition (e.g., a composition comprising an isolated nucleic acid or a vector or a rAAV) as described by the disclosure. In some embodiments, the CNS disease is a neurodegenerative disease, such as a neurodegenerative disease listed in Table 12. In some embodiments, the CNS disease is a synucleinopathy, such as a synucleinopathy listed in Table 13. In some embodiments, the CNS disease is a tauopathy, such as a tauopathy listed in Table 14. In some embodiments, the CNS disease is a lysosomal storage disease, such as a lysosomal storage disease listed in Table 15. In some embodiments, the lysosomal storage disease is neuronopathic Gaucher disease, such as Type 2 Gaucher disease or Type 3 Gaucher disease.
In some embodiments, the disclosure provides a method for treating a subject having or suspected of having Parkinson's disease, the method comprising administering to the subject a composition (e.g., a composition comprising an isolated nucleic acid or a vector or a rAAV) as described by the disclosure.
In some embodiments, the disclosure provides a method for treating a subject having or suspected of having fronto-temporal dementia (FTD), FTD with GRN mutation, FTD with tau mutation, FTD with C9orf72 mutation, ceroid lipofuscinosis, Parkinson's disease, Alzheimer's disease, corticobasal degeneration, motor neuron disease, or Gaucher disease, the method comprising administering to the subject an rAAV encoding Progranulin (PGRN), wherein the PGRN is encoded by the nucleic acid sequence in SEQ ID NO:68; and wherein the rAAV comprises a capsid protein having an AAV9 serotype.
In some embodiments, the disclosure provides a method for treating a subject having or suspected of having FTD with a GRN mutation, the method comprising administering to the subject an rAAV encoding Progranulin (PGRN), wherein the PGRN is encoded by the nucleic acid sequence in SEQ ID NO:68; and wherein the rAAV comprises a capsid protein having an AAV9 serotype. In some embodiments, the rAAV is administered to a subject at a dose of about 3.5×1013 vector genomes (vg), about 7.0×1013 vg, or about 1.4×1014 vg. In some embodiments, the rAAV is administered via an injection into the cisterna magna.
In some embodiments, a composition comprises a nucleic acid (e.g., an rAAV genome, for example encapsidated by AAV capsid proteins) that encodes two or more gene products (e.g., CNS disease-associated gene products), for example 2, 3, 4, 5, or more gene products described in this application. In some embodiments, a composition comprises two or more (e.g., 2, 3, 4, 5, or more) different nucleic acids (e.g., two or more rAAV genomes, for example separately encapsidated by AAV capsid proteins), each encoding one or more different gene products. In some embodiments, two or more different compositions are administered to a subject, each composition comprising one or more nucleic acids encoding different gene products. In some embodiments, different gene products are operably linked to the same promoter type (e.g., the same promoter). In some embodiments, different gene products are operably linked to different promoters.
An isolated nucleic acid may be DNA or RNA. The disclosure provides, in some aspects, isolated nucleic acids (e.g., rAAV vectors) comprising an expression construct encoding one or more PD-associated genes, for example a Gcase (e.g., the gene product of GBA1 gene) or a portion thereof. Gcase, also referred to as β-glucocerebrosidase or GBA, refers to a lysosomal protein that cleaves the beta-glucosidic linkage of the chemical glucocerebroside, an intermediate in glycolipid metabolism. In humans, Gcase is encoded by the GBA1 gene, located on chromosome 1. In some embodiments, GBA1 encodes a peptide that is represented by NCBI Reference Sequence NCBI Reference Sequence NP_000148.2 (SEQ ID NO: 14). In some embodiments, an isolated nucleic acid comprises a Gcase-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells), such as the sequence set forth in SEQ ID NO: 15.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding Prosaposin (e.g., the gene product of PSAP gene). Prosaposin is a precursor glycoprotein for sphingolipid activator proteins (saposins) A, B, C, and D, which facilitate the catabolism of glycosphingolipids with short oligosaccharide groups. In humans, the PSAP gene is located on chromosome 10. In some embodiments, PSAP encodes a peptide that is represented by NCBI Reference Sequence NP_002769.1 (e.g., SEQ ID NO: 16). In some embodiments, an isolated nucleic acid comprises a prosaposin-encoding sequence that has been codon optimized (e.g., codon optimized for expression in mammalian cells, for example human cells), such as the sequence set forth in SEQ ID NO: 17.
Aspects of the disclosure relate to an isolated nucleic acid comprising an expression construct encoding LIMP2/SCARB2 (e.g., the gene product of SCARB2 gene). SCARB2 refers to a membrane protein that regulates lysosomal and endosomal transport within a cell. In humans, SCARB2 gene is located on chromosome 4. In some embodiments, the SCARB2 gene encodes a peptide that is represented by NCBI Reference Sequence NP_005497.1 (SEQ ID NO: 18). In some embodiments, an isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 19. In some embodiments the isolated nucleic acid comprises a SCARB2-encoding sequence that has been codon optimized.
Aspects of the disclosure relate to an isolated nucleic acid comprising an expression construct encoding GBA2 protein (e.g., the gene product of GBA2 gene). GBA2 protein refers to non-lysosomal glucosylceramidase. In humans, GBA2 gene is located on chromosome 9. In some embodiments, the GBA2 gene encodes a peptide that is represented by NCBI Reference Sequence NP_065995.1 (SEQ ID NO: 30). In some embodiments, an isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 31. In some embodiments the isolated nucleic acid comprises a GBA2-encoding sequence that has been codon optimized.
Aspects of the disclosure relate to an isolated nucleic acid comprising an expression construct encoding GALC protein (e.g., the gene product of GALC gene). GALC protein refers to galactosylceramidase (or galactocerebrosidase), which is an enzyme that hydrolyzes galactose ester bonds of galactocerebroside, galactosylsphingosine, lactosylceramide, and monogalactosyldiglyceride. In humans, GALC gene is located on chromosome 14. In some embodiments, the GALC gene encodes a peptide that is represented by NCBI Reference Sequence NP_000144.2 (SEQ ID NO: 33). In some embodiments, an isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 34. In some embodiments the isolated nucleic acid comprises a GALC-encoding sequence that has been codon optimized.
Aspects of the disclosure relate to an isolated nucleic acid comprising an expression construct encoding CTSB protein (e.g., the gene product of CTSB gene). CTSB protein refers to cathepsin B, which is a lysosomal cysteine protease that plays an important role in intracellular proteolysis. In humans, CTSB gene is located on chromosome 8. In some embodiments, the CTSB gene encodes a peptide that is represented by NCBI Reference Sequence NP_001899.1 (SEQ ID NO: 35). In some embodiments, an isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 36. In some embodiments the isolated nucleic acid comprises a CTSB-encoding sequence that has been codon optimized.
Aspects of the disclosure relate to an isolated nucleic acid comprising an expression construct encoding SMPD1 protein (e.g., the gene product of SMPD1 gene). SMPD1 protein refers to sphingomyelin phosphodiesterase 1, which is a hydrolase enzyme that is involved in sphingolipid metabolism. In humans, SMPD1 gene is located on chromosome 11. In some embodiments, the SMPD1 gene encodes a peptide that is represented by NCBI Reference Sequence NP_000534.3 (SEQ ID NO: 37). In some embodiments, an isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 38. In some embodiments the isolated nucleic acid comprises a SMPD1-encoding sequence that has been codon optimized.
Aspects of the disclosure relate to an isolated nucleic acid comprising an expression construct encoding GCH1 protein (e.g., the gene product of GCH1 gene). GCH1 protein refers to GTP cyclohydrolase I, which is a hydrolase enzyme that is part of the folate and biopterin biosynthesis pathways. In humans, GCH1 gene is located on chromosome 14. In some embodiments, the GCH1 gene encodes a peptide that is represented by NCBI Reference Sequence NP_000152.1 (SEQ ID NO: 45). In some embodiments, an isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 46. In some embodiments the isolated nucleic acid comprises a GCH1-encoding sequence that has been codon optimized.
Aspects of the disclosure relate to an isolated nucleic acid comprising an expression construct encoding RAB7L protein (e.g., the gene product of RAB7L gene). RAB7L protein refers to RAB7, member RAS oncogene family-like 1, which is a GTP binding protein. In humans, RAB7L gene is located on chromosome 1. In some embodiments, the RAB7L gene encodes a peptide that is represented by NCBI Reference Sequence NP_003920.1 (SEQ ID NO: 47). In some embodiments, an isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 48. In some embodiments the isolated nucleic acid comprises a RAB7L-encoding sequence that has been codon optimized.
Aspects of the disclosure relate to an isolated nucleic acid comprising an expression construct encoding VPS35 protein (e.g., the gene product of VPS35 gene). VPS35 protein refers to vacuolar protein sorting-associated protein 35, which is part of a protein complex involved in retrograde transport of proteins from endosomes to the trans-Golgi network. In humans, VPS35 gene is located on chromosome 16. In some embodiments, the VPS35 gene encodes a peptide that is represented by NCBI Reference Sequence NP_060676.2 (SEQ ID NO: 49). In some embodiments, an isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 50. In some embodiments the isolated nucleic acid comprises a VPS35-encoding sequence that has been codon optimized.
Aspects of the disclosure relate to an isolated nucleic acid comprising an expression construct encoding IL-34 protein (e.g., the gene product of IL34 gene). IL-34 protein refers to interleukin 34, which is a cytokine that increases growth and survival of monocytes. In humans, IL34 gene is located on chromosome 16. In some embodiments, the IL34 gene encodes a peptide that is represented by NCBI Reference Sequence NP_689669.2 (SEQ ID NO: 55). In some embodiments, an isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 56. In some embodiments the isolated nucleic acid comprises a IL-34-encoding sequence that has been codon optimized.
Aspects of the disclosure relate to an isolated nucleic acid comprising an expression construct encoding TREM2 protein (e.g., the gene product of TREM2 gene). TREM2 protein refers to triggering receptor expressed on myeloid cells 2, which is an immunoglobulin superfamily receptor found on myeloid cells. In humans, TREM2 gene is located on chromosome 6. In some embodiments, the TREM2 gene encodes a peptide that is represented by NCBI Reference Sequence NP_061838.1 (SEQ ID NO: 57). In some embodiments, the isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 58. In some embodiments an isolated nucleic acid comprises a TREM2-encoding sequence that has been codon optimized.
Aspects of the disclosure relate to an isolated nucleic acid comprising an expression construct encoding TMEM106B protein (e.g., the gene product of TMEM106B gene). TMEM106B protein refers to transmembrane protein 106B, which is a protein involved in dendrite morphogenesis and regulation of lysosomal trafficking. In humans, TMEM106B gene is located on chromosome 7. In some embodiments, the TMEM106B gene encodes a peptide that is represented by NCBI Reference Sequence NP_060844.2 (SEQ ID NO: 62). In some embodiments, an isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 63. In some embodiments the isolated nucleic acid comprises a TMEM106B-encoding sequence that has been codon optimized.
Aspects of the disclosure relate to an isolated nucleic acid comprising an expression construct encoding progranulin protein (e.g., the gene product of PGRN gene). PGRN protein refers to progranulin, which is a protein involved in development, inflammation, cell proliferation and protein homeostasis. In humans, the PGRN gene is located on chromosome 17. In some embodiments, the PGRN gene encodes a peptide that is represented by NCBI Reference Sequence NP_002078.1 (SEQ ID NO: 67). In some embodiments, an isolated nucleic acid comprises the sequence set forth in SEQ ID NO: 68. In some embodiments the isolated nucleic acid comprises a PGRN-encoding sequence that has been codon optimized. In some embodiments, the nucleic acid further comprises a chicken j-actin (CBA) promoter and a cytomegalovirus enhancer (CMVe).
In some aspects, the disclosure provides an automated Western blot immunoassay to quantify a PGRN protein level in a cerebrospinal fluid (CSF) sample. In some embodiments, the immunoassay is a capillary-based automated Western blot immunoassay platform, where all steps, such as protein separation, immunoprobing, washing, and detection by chemiluminescence, occur in a capillary cartridge. In some embodiments, a CSF sample is from a human or a non-human primate. In some aspects, the immunoassay allows detection of differences in PGRN protein levels in the presence of circulating antibody. In some aspects, the disclosure provides a method of quantifying a progranulin protein level in a CSF sample, the method comprising: (1) diluting the CSF sample (e.g., a 4-fold dilution); (2) loading the CSF sample; an anti-progranulin antibody; a secondary antibody that detects the anti-progranulin antibody, luminol, and peroxide into wells of a capillary cartridge; (3) loading the capillary cartridge into an automated Western blot immunoassay instrument; (4) using the automated Western blot immunoassay instrument to calculate one or more of: signal intensity, peak area, signal-to-noise ratio and total protein normalization parameters; and (5) quantifying a progranulin protein level in the CSF sample as the peak area of immunoreactivity to the anti-progranulin antibody. In some embodiments, the CSF sample is diluted in a master mix comprising dithiothreitol (DTT) and sample buffer. The master mix may further comprise other proprietary components. In some aspects, the anti-progranulin antibody detects human progranulin. In some embodiments, a progranulin protein level is quantified from the calculated parameters using software that controls the automated Western blot immunoassay instrument. In some embodiments, the software is Compass software for Simple Western™ (ProteinSimple, San Jose, CA).
In some embodiments, the disclosure provides a method of quantifying a progranulin protein level in a cerebrospinal fluid (CSF) sample, the method comprising: (1) diluting the CSF sample (e.g., a 4-fold dilution) in a master mix containing dithiothreitol (DTT) and sample buffer; (2) loading the diluted CSF sample, an anti-progranulin antibody; a secondary antibody that detects the anti-progranulin antibody, luminol, and peroxide into wells of a capillary cartridge; (3) loading the capillary cartridge into an automated Western blot immunoassay instrument; (4) using the automated Western blot immunoassay instrument to calculate signal intensity, peak area, and signal-to-noise ratio; and (5) quantifying a progranulin protein level in the CSF sample as the peak area of immunoreactivity to the anti-progranulin antibody.
In some aspects, the disclosure provides an isolated nucleic acid comprising an expression construct encoding a first gene product and a second gene product, wherein each gene product independently is selected from the gene products, or portions thereof, set forth in Table 1.
In some embodiments, an isolated nucleic acid or vector (e.g., rAAV vector) described by the disclosure comprises or consists of a sequence set forth in any one of SEQ ID NOs: 1-91. In some embodiments, an isolated nucleic acid or vector (e.g., rAAV vector) described by the disclosure comprises or consists of a sequence that is complementary (e.g., the complement of) a sequence set forth in any one of SEQ ID NOs: 1-91. In some embodiments, an isolated nucleic acid or vector (e.g., rAAV vector) described by the disclosure comprises or consists of a sequence that is a reverse complement of a sequence set forth in any one of SEQ ID NOs: 1-91. In some embodiments, an isolated nucleic acid or vector (e.g., rAAV vector) described by the disclosure comprises or consists of a portion of a sequence set forth in any one of SEQ ID NOs: 1-91. A portion may comprise at least 25%, 50%, 60%, 70%, 80%, 90%, 95%, or 99% of a sequence set forth in any one of SEQ ID NOs: 1-91. In some embodiments, a nucleic acid sequence described by the disclosure is a nucleic acid sense strand (e.g., 5′ to 3′ strand), or in the context of a viral sequences a plus (+) strand. In some embodiments, a nucleic acid sequence described by the disclosure is a nucleic acid antisense strand (e.g., 3′ to 5′ strand), or in the context of viral sequences a minus (−) strand.
In some embodiments, a gene product is encoded by a coding portion (e.g., a cDNA) of a naturally occurring gene. In some embodiments, a first gene product is a protein (or a fragment thereof) encoded by the GBA1 gene. In some embodiments, a gene product is a protein (or a fragment thereof) encoded by another gene listed in Table 1, for example the SCARB2/LIMP2 gene or the PSAP gene. However, the skilled artisan recognizes that the order of expression of a first gene product (e.g., Gcase) and a second gene product (e.g., LIMP2, etc.) can generally be reversed (e.g., LIMP2 is the first gene product and Gcase is the second gene product). In some embodiments, a gene product is a fragment (e.g., portion) of a gene listed in Table 1. A protein fragment may comprise about 50%, about 60%, about 70%, about 80% about 90% or about 99% of a protein encoded by the genes listed in Table 1. In some embodiments, a protein fragment comprises between 50% and 99.9% (e.g., any value between 50% and 99.9%) of a protein encoded by a gene listed in Table 1.
In some embodiments, an expression construct is monocistronic (e.g., the expression construct encodes a single fusion protein comprising a first gene product and a second gene product). In some embodiments, an expression construct is polycistronic (e.g., the expression construct encodes two distinct gene products, for example two different proteins or protein fragments).
A polycistronic expression vector may comprise a one or more (e.g., 1, 2, 3, 4, 5, or more) promoters. Any suitable promoter can be used, for example, a constitutive promoter, an inducible promoter, an endogenous promoter, a tissue-specific promoter (e.g., a CNS-specific promoter), etc. In some embodiments, a promoter is a chicken beta-actin promoter (CBA promoter), a CAG promoter (for example as described by Alexopoulou et al. (2008) BMC Cell Biol. 9:2; doi: 10.1186/1471-2121-9-2), a CD68 promoter, or a JeT promoter (for example as described by Tornoe et al. (2002) Gene 297(1-2):21-32). In some embodiments, a promoter is operably-linked to a nucleic acid sequence encoding a first gene product, a second gene product, or a first gene product and a second gene product. In some embodiments, an expression cassette comprises one or more additional regulatory sequences, including but not limited to transcription factor binding sequences, intron splice sites, poly(A) addition sites, enhancer sequences, repressor binding sites, or any combination of the foregoing.
In some embodiments, a nucleic acid sequence encoding a first gene product and a nucleic acid sequence encoding a second gene product are separated by a nucleic acid sequence encoding an internal ribosomal entry site (IRES). Examples of TRES sites are described, for example, by Mokrejs et al. (2006) Nucleic Acids Res. 34 (Database issue):D125-30. In some embodiments, a nucleic acid sequence encoding a first gene product and a nucleic acid sequence encoding a second gene product are separated by a nucleic acid sequence encoding a self-cleaving peptide. Examples of self-cleaving peptides include but are not limited to T2A, P2A, E2A, F2A, BmCPV 2A, and BmIFV 2A, and those described by Liu et al. (2017) Sci Rep. 7: 2193. In some embodiments, the self-cleaving peptide is a T2A peptide.
Pathologically, disorders such as PD and Gaucher disease are associated with accumulation of protein aggregates composed largely of α-Synuclein (α-Syn) protein. Accordingly, in some embodiments, isolated nucleic acids described herein comprise an inhibitory nucleic acid that reduces or prevents expression of α-Syn protein. A sequence encoding an inhibitory nucleic acid may be placed in an untranslated region (e.g., intron, 5′UTR, 3′UTR, etc.) of the expression vector.
In some embodiments, an inhibitory nucleic acid is positioned in an intron of an expression construct, for example in an intron upstream of the sequence encoding a first gene product. An inhibitory nucleic acid can be a double stranded RNA (dsRNA), siRNA, shRNA, micro RNA (miRNA), artificial miRNA (amiRNA), or an RNA aptamer. Generally, an inhibitory nucleic acid binds to (e.g., hybridizes with) between about 6 and about 30 (e.g., any integer between 6 and 30, inclusive) contiguous nucleotides of a target RNA (e.g., mRNA). In some embodiments, the inhibitory nucleic acid molecule is an miRNA or an amiRNA, for example an miRNA that targets SNCA (the gene encoding α-Syn protein) or TMEM106B (e.g. the gene encoding TMEM106B protein). In some embodiments, the miRNA does not comprise any mismatches with the region of SNCA mRNA to which it hybridizes (e.g., the miRNA is “perfected”). In some embodiments, the inhibitory nucleic acid is an shRNA (e.g., an shRNA targeting SNCA or TMEM106B). In some embodiments, an inhibitory nucleic acid is an artificial miRNA (amiRNA) that includes a miR-155 scaffold and a SNCA or TMEM106B targeting sequence.
The skilled artisan recognizes that when referring to nucleic acid sequences comprising or encoding inhibitory nucleic acids (e.g., dsRNA, siRNA, miRNA, amiRNA, etc.) any one or more thymidine (T) nucleotides or uridine (U) nucleotides in a sequence provided herein may be replaced with any other nucleotide suitable for base pairing (e.g., via a Watson-Crick base pair) with an adenosine nucleotide. For example, T may be replaced with U, and U may be replaced with T.
An isolated nucleic acid as described herein may exist on its own, or as part of a vector. Generally, a vector can be a plasmid, cosmid, phagemid, bacterial artificial chromosome (BAC), or a viral vector (e.g., adenoviral vector, adeno-associated virus (AAV) vector, retroviral vector, baculoviral vector, etc.). In some embodiments, the vector is a plasmid (e.g., a plasmid comprising an isolated nucleic acid as described herein). In some embodiments, an rAAV vector is single-stranded (e.g., single-stranded DNA). In some embodiments, the vector is a recombinant AAV (rAAV) vector. In some embodiments, a vector is a Baculovirus vector (e.g., an Autographa californica nuclear polyhedrosis (AcNPV) vector).
Typically an rAAV vector (e.g., rAAV genome) comprises a transgene (e.g., an expression construct comprising one or more of each of the following: promoter, intron, enhancer sequence, protein coding sequence, inhibitory RNA coding sequence, polyA tail sequence, etc.) flanked by two AAV inverted terminal repeat (ITR) sequences. In some embodiments the transgene of an rAAV vector comprises an isolated nucleic acid as described by the disclosure. In some embodiments, each of the two ITR sequences of an rAAV vector is a full-length ITR (e.g., approximately 145 bp in length, and containing functional Rep binding site (RBS) and terminal resolution site (trs)). In some embodiments, one of the ITRs of an rAAV vector is truncated (e.g., shortened or not full-length). In some embodiments, a truncated ITR lacks a functional terminal resolution site (trs) and is used for production of self-complementary AAV vectors (scAAV vectors). In some embodiments, a truncated ITR is a ΔITR, for example as described by McCarty et al. (2003) Gene Ther. 10(26):2112-8. In some embodiments, each of the two ITR sequences is an AAV2 ITR sequence.
Aspects of the disclosure relate to isolated nucleic acids (e.g., rAAV vectors) comprising an ITR having one or more modifications (e.g., nucleic acid additions, deletions, substitutions, etc.) relative to a wild-type AAV ITR, for example relative to wild-type AAV2 ITR (e.g., SEQ ID NO: 29). The structure of wild-type AAV2 ITR is shown in
The disclosure is based, in part, on the surprising discovery that rAAV vectors comprising a “D” region located on the “outside” of the ITR (e.g., proximal to the terminus of the ITR relative to the transgene insert or expression construct) are efficiently encapsidated by AAV capsid proteins than rAAV vectors having ITRs with unmodified (e.g., wild-type) ITRs In some embodiments, rAAV vectors having a modified “D” sequence (e.g., a “D” sequence in the “outside” position) have reduced toxicity relative to rAAV vectors having wild-type ITR sequences.
In some embodiments, a modified “D” sequence comprises at least one nucleotide substitution relative to a wild-type “D” sequence (e.g., SEQ ID NO: 27). A modified “D” sequence may have at least 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more than 10 nucleotide substitutions relative to a wild-type “D” sequence (e.g., SEQ ID NO: 27). In some embodiments, a modified “D” sequence comprises at least 10, 11, 12, 13, 14, 15, 16, 17, 18, or 19 nucleic acid substitutions relative to a wild-type “D” sequence (e.g., SEQ ID NO: 27). In some embodiments, a modified “D” sequence is between about 10% and about 99% (e.g., 10%, 15%, 20%, 25%, 30%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 99%) identical to a wild-type “D” sequence (e.g., SEQ ID NO: 27). In some embodiments, a modified “D” sequence comprises the sequence set forth in SEQ ID NO: 26, also referred to as an “S” sequence as described in Wang et al. (1995) J Mol Biol 250(5):573-80.
An isolated nucleic acid or rAAV vector as described by the disclosure may further comprise a “TRY” sequence, for example as set forth in SEQ ID NO: 28 or as described by Francois et al., (2005) J Virol. 79(17):11082-11094. In some embodiments, a TRY sequence is positioned between an ITR (e.g. a 5′ ITR) and an expression construct (e.g. a transgene-encoding insert) of an isolated nucleic acid or rAAV vector.
In some aspects, the disclosure relates to Baculovirus vectors comprising an isolated nucleic acid or rAAV vector as described by the disclosure. In some embodiments, the Baculovirus vector is an Autographa californica nuclear polyhedrosis (AcNPV) vector, for example as described by Urabe et al. (2002) Hum Gene Ther 13(16):1935-43 and Smith et al. (2009) Mol Ther 17(11):1888-1896.
In some aspects, the disclosure provides a host cell comprising an isolated nucleic acid or vector as described herein. A host cell can be a prokaryotic cell or a eukaryotic cell. For example, a host cell can be a mammalian cell, bacterial cell, yeast cell, insect cell, etc. In some embodiments, a host cell is a mammalian cell, for example a HEK293T cell. In some embodiments, a host cell is a bacterial cell, for example an E. coli cell.
rAAVs
In some aspects, the disclosure relates to recombinant AAVs (rAAVs) comprising a transgene that encodes a nucleic acid as described herein (e.g., an rAAV vector as described herein). The term “rAAVs” generally refers to viral particles comprising an rAAV vector encapsidated by one or more AAV capsid proteins. An rAAV described by the disclosure may comprise a capsid protein having a serotype selected from AAV1, AAV2, AAV3, AAV4, AAV5, AAV6, AAV7, AAV8, AAV9, and AAV10. In some embodiments, an rAAV comprises a capsid protein from a non-human host, for example a rhesus AAV capsid protein such as AAVrh.10, AAVrh.39, etc. In some embodiments, an rAAV described by the disclosure comprises a capsid protein that is a variant of a wild-type capsid protein, such as a capsid protein variant that includes at least 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more than 10 (e.g., 15, 20 25, 50, 100, etc.) amino acid substitutions (e.g., mutations) relative to the wild-type AAV capsid protein from which it is derived. In some embodiments, an AAV capsid protein variant is an AAV1RX capsid protein, for example as described by Albright et al. Mol Ther. 2018 Feb. 7; 26(2):510-523. In some embodiments, a capsid protein variant is an AAV TM6 capsid protein, for example as described by Rosario et al. Mol Ther Methods Clin Dev. 2016; 3: 16026.
In some embodiments, rAAVs described by the disclosure readily spread through the CNS, particularly when introduced into the CSF space or directly into the brain parenchyma. Accordingly, in some embodiments, rAAVs described by the disclosure comprise a capsid protein that is capable of crossing the blood-brain barrier (BBB). For example, in some embodiments, an rAAV comprises a capsid protein having an AAV9 or AAVrh.10 serotype. Production of rAAVs is described, for example, by Samulski et al. (1989)J Virol. 63(9):3822-8 and Wright (2009) Hum Gene Ther. 20(7): 698-706. In some embodiments, an rAAV comprises a capsid protein that specifically or preferentially targets myeloid cells, for example microglial cells.
In some embodiments, the disclosure provides an rAAV referred to as “PR006A”. PR006A is a rAAV that delivers a functional human GRN gene, leading to increased expression of functional human PGRN. The PR006A vector insert comprises the chicken j-actin (CBA) promoter element, comprising 4 parts: the cytomegalovirus (CMV) enhancer, CBA promoter, exon 1, and intron (int) to constitutively express a codon-optimized coding sequence of human GRN (SEQ ID NO:68). The 3′ region also contains a woodchuck hepatitis virus post-transcriptional regulatory element (WPRE) followed by a bovine growth hormone polyadenylation signal tail. Three well described transcriptional regulatory activation
sites are included at the 5′ end of the promoter region: TATA, RBS, and YY1 (see, e.g., Francois et al., (2005) J. Virol. 79(17):11082-11094). The flanking inverted terminal repeats (ITRs) allow for the correct packaging of the intervening sequences. The backbone contains the gene to confer resistance to kanamycin as well as a stuffer sequence to prevent reverse packaging. A schematic depicting the rAAV vector is shown in
In some embodiments, an rAAV as described by the disclosure (e.g., comprising a recombinant rAAV genome encapsidated by AAV capsid proteins to form an rAAV capsid particle) is produced in a Baculovirus vector expression system (BEVS). Production of rAAVs using BEVS are described, for example by Urabe et al. (2002) Hum Gene Ther 13(16):1935-43, Smith et al. (2009) Mol Ther 17(11):1888-1896, U.S. Pat. Nos. 8,945,918, 9,879,282, and International PCT Publication WO 2017/184879. However, an rAAV can be produced using any suitable method (e.g., using recombinant rep and cap genes). In some embodiments, an rAAV as disclosed herein is produced in HEK293 (human embryonic kidney) cells.
In some aspects, the disclosure provides pharmaceutical compositions comprising an isolated nucleic acid or rAAV as described herein and a pharmaceutically acceptable carrier. As used herein, the term “pharmaceutically acceptable” refers to a material, such as a carrier or diluent, which does not abrogate the biological activity or properties of the compound, and is relatively non-toxic, e.g., the material may be administered to an individual without causing undesirable biological effects or interacting in a deleterious manner with any of the components of the composition in which it is contained.
As used herein, the term “pharmaceutically acceptable carrier” means a pharmaceutically acceptable material, composition or carrier, such as a liquid or solid filler, stabilizer, dispersing agent, suspending agent, diluent, excipient, thickening agent, solvent or encapsulating material, involved in carrying or transporting a compound useful within the invention within or to the patient such that it may perform its intended function. Additional ingredients that may be included in the pharmaceutical compositions used in the practice of the invention are known in the art and described, for example in Remington's Pharmaceutical Sciences (Genaro, Ed., Mack Publishing Co., 1985, Easton, PA), which is incorporated herein by reference.
Compositions (e.g., pharmaceutical compositions) provided herein can be administered by any route, including enteral (e.g., oral), parenteral, intravenous, intramuscular, intra-arterial, intramedullary, intrathecal, subcutaneous, intraventricular, transdermal, interdermal, rectal, intravaginal, intraperitoneal, topical (as by powders, ointments, creams, and/or drops), mucosal, nasal, bucal, sublingual; by intratracheal instillation, bronchial instillation, and/or inhalation; and/or as an oral spray, nasal spray, and/or aerosol. Specifically contemplated routes are oral administration, intravenous administration (e.g., systemic intravenous injection), regional administration via blood and/or lymph supply, and/or direct administration to an affected site. In general, the most appropriate route of administration will depend upon a variety of factors including the nature of the agent (e.g., its stability in the environment of the gastrointestinal tract), and/or the condition of the subject (e.g., whether the subject is able to tolerate oral administration). In certain embodiments, the compound or pharmaceutical composition described herein is suitable for topical administration to the eye of a subject.
In some embodiments, the disclosure provides a PR006A finished drug product comprising the PR006A rAAV described above presented in aqueous solution. In some embodiments, the final formulation buffer comprises about 20 mM Tris [pH 8.0], about 1 mM MgCl2, about 200 mM NaCl, and about 0.001% [w/v] poloxamer 188. In some embodiments, the finished drug product and the final formulation buffer are suitable for intra-cisterna magna (ICM) injection.
Provided herein is a therapeutic combination of: (A) a rAAV comprising: (a) a rAAV vector comprising a nucleic acid comprising an expression construct comprising a promoter operably linked to a transgene insert encoding a PGRN protein, wherein the transgene insert comprises the nucleotide sequence of SEQ ID NO: 68; and (b) an AAV9 capsid protein; and (B) sirolimus, for use in a method of treating fronto-temporal dementia with a GRN mutation in a subject.
Provided herein is a therapeutic combination of a recombinant adeno-associated virus (rAAV) comprising: (i) a rAAV vector comprising a nucleic acid comprising an expression construct comprising a promoter operably linked to a transgene insert encoding a progranulin (PGRN) protein, wherein the transgene insert comprises the nucleotide sequence of SEQ ID NO: 68; and (ii) an adeno-associated virus (AAV) 9 capsid protein; and one or more immunosuppressants for use in a method of treating fronto-temporal dementia with a GRN mutation in a subject. Provided herein is a therapeutic combination of a recombinant adeno-associated virus (rAAV) comprising: (i) a rAAV vector comprising a nucleic acid comprising an expression construct comprising a promoter operably linked to a transgene insert encoding a progranulin (PGRN) protein, wherein the transgene insert comprises the nucleotide sequence of SEQ ID NO: 68; and (ii) an adeno-associated virus (AAV) 9 capsid protein; and one or more of the following: (A) sirolimus; (B) methylprednisolone; (C) rituximab; and (D) prednisone for use in a method of treating fronto-temporal dementia with a GRN mutation in a subject.
Provided herein is a therapeutic combination of a recombinant adeno-associated virus (rAAV) comprising: (i) a rAAV vector comprising a nucleic acid comprising an expression construct comprising a promoter operably linked to a transgene insert encoding a progranulin (PGRN) protein, wherein the transgene insert comprises the nucleotide sequence of SEQ ID NO: 68; and (ii) an adeno-associated virus (AAV) 9 capsid protein; and one or more of the following: (A) sirolimus; (B) methylprednisolone; (C) rituximab; and (D) prednisone for use in a method of suppressing an immune response in a subject having or suspected of having fronto-temporal dementia with a GRN mutation.
In some embodiments, the therapeutic combination comprises from about 1×1013 vg to about 7×1014 vg of the rAAV. In some embodiments, the therapeutic combination comprises about 3.5×1013 vg, about 7.0×1013 vg or about 1.4×1014 vg of the rAAV.
In some embodiments, the therapeutic combination comprises an additional immunosuppressant that is not sirolimus, methylprednisolone, rituximab or prednisone.
Aspects of the disclosure relate to compositions for expression of one or more CNS disease-associated gene products in a subject to treat CNS-associated diseases. The one or more CNS disease-associated gene products may be encoded by one or more isolated nucleic acids or rAAV vectors. In some embodiments, a subject is administered a single vector (e.g., isolated nucleic acid, rAAV, etc.) encoding one or more (1, 2, 3, 4, 5, or more) gene products. In some embodiments, a subject is administered a plurality (e.g., 2, 3, 4, 5, or more) vectors (e.g., isolated nucleic acids, rAAVs, etc.), where each vector encodes a different CNS disease-associated gene product.
A CNS-associated disease may be a neurodegenerative disease, synucleinopathy, tauopathy, or a lysosomal storage disease. Examples of neurodegenerative diseases and their associated genes are listed in Table 12.
A “synucleinopathy” refers to a disease or disorder characterized by the accumulation of alpha-Synuclein (the gene product of SNCA) in a subject (e.g., relative to a healthy subject, for example a subject not having a synucleinopathy). Examples of synucleinopathies and their associated genes are listed in Table 13.
A “tauopathy” refers to a disease or disorder characterized by accumulation of abnormal Tau protein in a subject (e.g., relative to a healthy subject not having a tauopathy). Examples of tauopathies and their associated genes are listed in Table 14.
A “lysosomal storage disease” refers to a disease characterized by abnormal build-up of toxic cellular products in lysosomes of a subject. Examples of lysosomal storage diseases and their associated genes are listed in Table 15.
As used herein “treat” or “treating” refers to (a) preventing or delaying onset of a CNS disease; (b) reducing severity of a CNS disease; (c) reducing or preventing development of symptoms characteristic of a CNS disease; (d) and/or preventing worsening of symptoms characteristic of a CNS disease. Symptoms of CNS disease may include, for example, motor dysfunction (e.g., shaking, rigidity, slowness of movement, difficulty with walking, paralysis), cognitive dysfunction (e.g., dementia, depression, anxiety, psychosis), difficulty with memory, emotional and behavioral dysfunction.
The disclosure is based, in part, on compositions for expression of combinations of PD-associated gene products in a subject that act together (e.g., synergistically) to treat Parkinson's disease.
Accordingly, in some aspects, the disclosure provides a method for treating a subject having or suspected of having Parkinson's disease, the method comprising administering to the subject a composition (e.g., a composition comprising an isolated nucleic acid or a vector or a rAAV) as described by the disclosure.
The disclosure is based, in part, on compositions for expression of one or more CNS-disease associated gene products in a subject to treat Gaucher disease. In some embodiments, the Gaucher disease is a neuronopathic Gaucher disease, for example Type 2 Gaucher disease or Type 3 Gaucher disease. In some embodiments, a subject having Gaucher disease does not have PD or PD symptoms.
Accordingly, in some aspects, the disclosure provides a method for treating a subject having or suspected of having neuronopathic Gaucher disease, the method comprising administering to the subject a composition (e.g., a composition comprising an isolated nucleic acid or a vector or a rAAV) as described by the disclosure.
The disclosure is based, in part, on compositions for expression of one or more CNS-disease associated gene products in a subject to treat Alzheimer's disease or fronto-temporal dementia (FTD). In some embodiments, the subject does not have Alzheimer's disease. In some embodiments, the subject has FTD and does not have Alzheimer's disease. In some embodiments, the subject has FTD with GRN (progranulin) mutation. In some embodiments, the subject has FTD with GRN mutation, and the subject is heterozygous for a GRN mutation (e.g., a pathogenic GRN mutation). In some embodiments, a GRN mutation is a null mutation (e.g., a nonsense, a frameshift, or a splice site mutations, or a complete or partial (exonic) gene deletion). In some embodiments, a GRN mutation is a pathogenic mutation with proven functional deleterious effect. In some embodiments, a GRN mutation is a missense pathogenic mutation. In some embodiments, a GRN mutation is listed in the Molgen FTD database (molgen.ua.ac.be). In some embodiments, a GRN mutation produces a low plasma PGRN level (<70 ng/mL) in a subject.
In some embodiments, the subject has FTD, FTD with GRN mutation, FTD with tau mutation, FTD with C9orf72 mutation, neuronal ceroid lipofuscinosis, Parkinson's disease, Alzheimer's disease, corticobasal degeneration, motor neuron disease, or Gaucher disease.
In some embodiments, the subject has symptomatic FTD (e.g., behavioral-variant FTD (bvFTD), primary progressive aphasia (PPA)-FTD, FTD with corticobasal syndrome, or a combination of syndromes).
Accordingly, in some aspects, the disclosure provides a method for treating a subject having or suspected of having FTD with GRN mutation, the method comprising administering to the subject a composition (e.g., a composition comprising an isolated nucleic acid or a vector or a rAAV) as described by the disclosure.
In some embodiments, a subject having Alzheimer's disease or FTD (e.g. FTD with GRN mutation) is administered an rAAV encoding Progranulin (PGRN) or a portion thereof. In some embodiments, a subject having Alzheimer's disease or FTD (e.g. FTD with GRN mutation) is administered an rAAV encoding PGRN or a portion thereof, wherein the PGRN protein is encoded by a codon-optimized nucleic acid sequence or the nucleic acid sequence in SEQ ID NO:68. In some embodiments, the PGRN protein comprises the amino acid sequence in SEQ ID NO:67 or a portion thereof. In some embodiments, the rAAV encoding PGRN comprises a capsid protein having an AAV9 serotype.
In some embodiments, a composition comprising an rAAV encoding PGRN for treating FTD (e.g. FTD with GRN mutation) is administered to a subject at a dose ranging from about 1×1012 vector genomes (vg) to about 1×1015 vg, or from about 1×1013 vg to about 7×1014 vg, or from about 1×1013 vg to about 5×1014 vg, or from about 2×1013 vg to about 2×1014 vg, or from about 3×1013 vg to about 2×1014 vg, or from about 3.5×1013 vg to about 1.4×1014 vg. In some embodiments, a composition comprising an rAAV encoding PGRN for treating FTD (e.g. FTD with GRN mutation) is administered to a subject at a dose of about 2×1013 vg, about 3×1013 vg, about 4×1013 vg, about 5×1013 vg, about 6×1013 vg, about 7×1013 vg, about 8×1013 vg, about 9×1013 vg, about 1×1014 vg, or about 2×1014 vg.
In some aspects, the disclosure provides a method for treating a subject having or suspected of having FTD (e.g. FTD with GRN mutation), the method comprising administering to the subject a composition comprising an rAAV encoding PGRN, wherein the composition is administered at a dose of about 3.5×1013 vector genomes (vg), about 7.0×1013 vg, or about 1.4×1014 vg.
In some aspects, the disclosure provides a method for treating a subject having or suspected of having FTD (e.g. FTD with GRN mutation), the method comprising administering to the subject a composition comprising an rAAV encoding PGRN, wherein the composition is administered at a dose of about 1×1014 vector genomes (vg), about 2.0×1014 vg, or about 4.0×1014 vg.
In some embodiments, a composition comprising an rAAV encoding PGRN for treating FTD (e.g. FTD with GRN mutation) to a subject as a single dose, and the composition is not administered to the subject subsequently.
In some embodiments, the composition comprising the rAAV is delivered via a single suboccipital injection into the cisterna magna. In some embodiments, the injection into the cisterna magna is performed under radiographic guidance.
In some embodiments, the disclosure provides a method for treating a symptom of a subject having or suspected of having FTD with GRN mutation, the method comprising administering to the subject a composition comprising an rAAV encoding the sequence for functional Progranulin (PGRN) protein, wherein the PGRN protein is encoded by a codon-optimized nucleic acid sequence or the nucleic acid sequence in SEQ ID NO:68. In some embodiments, a symptom of FTD with GRN mutation may be a personality change, impairment of executive function, disinhibition, apathy, slow speech production, misuse of grammar, multimodal agnosia, semantic aphasia, or impaired word comprehension. In some embodiments, the rAAV encoding PGRN comprises a capsid protein having an AAV9 serotype.
In some embodiments, the disclosure provides a method for reducing lipofuscin accumulation in the brain of a subject having or suspected of having FTD with GRN mutation, the method comprising administering to the subject a composition comprising an rAAV encoding Progranulin (PGRN), wherein the PGRN protein is encoded by a codon-optimized nucleic acid sequence or the nucleic acid sequence in SEQ ID NO:68. In some aspects, the disclosure provides a method for reducing ubiquitin accumulation in the brain of a subject having or suspected of having FTD with GRN mutation, the method comprising administering to the subject a composition comprising an rAAV encoding Progranulin (PGRN), wherein the PGRN protein is encoded by a codon-optimized nucleic acid sequence or the nucleic acid sequence in SEQ ID NO:68. In some aspects, the disclosure provides a method for reducing gene expression and/or protein expression of TNFα and/or CD68 in the brain of a subject having or suspected of having FTD with GRN mutation, the method comprising administering to the subject a composition comprising an rAAV encoding Progranulin (PGRN), wherein the PGRN protein is encoded by a codon-optimized nucleic acid sequence or the nucleic acid sequence in SEQ ID NO:68. In some aspects, the disclosure provides a method for increasing the maturation of cathepsin D in the brain of a subject having or suspected of having FTD with GRN mutation, the method comprising administering to the subject a composition comprising an rAAV encoding Progranulin (PGRN), wherein the PGRN protein is encoded by a codon-optimized nucleic acid sequence or the nucleic acid sequence in SEQ ID NO:68. In some aspects, the disclosure provides a method for increasing the level of nuclear TDP-43 (transactive response DNA binding protein 43 kDa) protein in the brain of a subject having or suspected of having FTD with GRN mutation, the method comprising administering to the subject a composition comprising an rAAV encoding Progranulin (PGRN), wherein the PGRN protein is encoded by a codon-optimized nucleic acid sequence or the nucleic acid sequence in SEQ ID NO:68. In some embodiments, the disclosure provides a method for reducing a level of neurofilament light chain (NfL) in blood or CSF of a subject having or suspected of having FTD with GRN mutation, the method comprising administering to the subject a composition comprising an rAAV encoding Progranulin (PGRN), wherein the PGRN protein is encoded by a codon-optimized nucleic acid sequence or the nucleic acid sequence in SEQ ID NO:68. In some embodiments, the rAAV encoding PGRN comprises a capsid protein having an AAV9 serotype.
A subject is typically a mammal, preferably a human. In some embodiments, a subject is between the ages of 1 month old and 10 years old (e.g., 1 month, 2 months, 3 months, 4, months, 5 months, 6 months, 7 months, 8 months, 9 months, 10 months, 11 months, 12 months, 13 months, 14 months, 15 months, 16 months, 17 months, 18 months, 19 months, 20 months, 21 months, 22 months, 23 months, 24 months, 3, years, 4 years, 5 years, 6 years, 7 years, 8 years, 9 years, 10 years, or any age therebetween). In some embodiments, a subject is between 2 years old and 20 years old. In some embodiments, a subject is between 30 years old and 100 years old. In some embodiments, a subject is older than 55 years old.
In some embodiments, a composition is administered directly to the CNS of the subject, for example by direct injection into the brain and/or spinal cord of the subject. Examples of CNS-direct administration modalities include but are not limited to intracerebral injection, intraventricular injection, intracisternal injection, intraparenchymal injection, intrathecal injection, and any combination of the foregoing. In some embodiments, a composition is administered to a subject by intra-cisterna magna (ICM) injection. In some embodiments, direct injection into the CNS of a subject results in transgene expression (e.g., expression of the first gene product, second gene product, and if applicable, third gene product) in the midbrain, striatum and/or cerebral cortex of the subject. In some embodiments, direct injection into the CNS results in transgene expression (e.g., expression of the first gene product, second gene product, and if applicable, third gene product) in the spinal cord and/or CSF of the subject.
In some embodiments, direct injection to the CNS of a subject comprises convection enhanced delivery (CED). Convection enhanced delivery is a therapeutic strategy that involves surgical exposure of the brain and placement of a small-diameter catheter directly into a target area of the brain, followed by infusion of a therapeutic agent (e.g., a composition or rAAV as described herein) directly to the brain of the subject. CED is described, for example by Debinski et al. (2009) Expert Rev Neurother. 9(10):1519-27.
In some embodiments, a composition is administered peripherally to a subject, for example by peripheral injection. Examples of peripheral injection include subcutaneous injection, intravenous injection, intra-arterial injection, intraperitoneal injection, or any combination of the foregoing. In some embodiments, the peripheral injection is intra-arterial injection, for example injection into the carotid artery of a subject.
In some embodiments, a composition (e.g., a composition comprising an isolated nucleic acid or a vector or a rAAV) as described by the disclosure is administered both peripherally and directly to the CNS of a subject. For example, in some embodiments, a subject is administered a composition by intra-arterial injection (e.g., injection into the carotid artery) and by intraparenchymal injection (e.g., intraparenchymal injection by CED). In some embodiments, the direct injection to the CNS and the peripheral injection are simultaneous (e.g., happen at the same time). In some embodiments, the direct injection occurs prior (e.g., between 1 minute and 1 week, or more before) to the peripheral injection. In some embodiments, the direct injection occurs after (e.g., between 1 minute and 1 week, or more after) the peripheral injection.
In some embodiments, a subject is administered an immunosuppressant prior to (e.g., between 1 month and 1 minute prior to) or at the same time as a composition as described herein. In some embodiments, the immunosuppressant is a corticosteroid (e.g., prednisone, budesonide, etc.), an mTOR inhibitor (e.g., sirolimus, everolimus, etc.), an antibody (e.g., adalimumab, etanercept, natalizumab, etc.), or methotrexate.
In some embodiments, a subject is administered a sirolimus oral loading dose of about 6 mg on Day −1 (window Day −3 to Day −1) (where day 0 is the administration of the rAAV). For example, a sirolimus dose may be administered at Day −3, Day −2, or Day −1. In some embodiments, a subsequent sirolimus maintenance dose of 2 mg is administered and adjusted, as needed, to maintain serum trough levels of about 4 ng/mL (range from about 2 ng/mL to about 8 ng/mL) through Month 3. In some embodiments, a subsequent sirolimus maintenance dose of 2 mg is administered and adjusted, as needed, to maintain serum trough levels of from about 4 ng/ml to about 9 ng/mL through Month 3. In some embodiments, sirolimus is subsequently tapered during the subsequent 15 days to 30 days (after the conclusion of Month 3). In some embodiments, trough levels are collected prior to administration of the sirolimus dose.
In some embodiments, a subject is administered a methylprednisolone intravenous loading dose of about 1 g on Day 0 (window Day −1 to Day 0) followed by administration of about 30 mg prednisone orally for 14 days starting the day after the rAAV administration. In some embodiments, prednisone is tapered during the subsequent 7 days. In some embodiments, prednisone is administered orally at a dose of 0.5 mg/kg daily as concomitant medication from Day 1 for 14 days, then 0.25 mg/kg daily for 4 days, followed by a slow taper from 0.1 mg/kg to 0 mg/kg daily over 4 days. In some embodiments, the methylprednisolone and prednisone administration is combined with the sirolimus administration described above. In some embodiments, higher doses or a longer taper of prednisone may be used (e.g., in cases of elevated alanine aminotransferase (ALT)/aspartate aminotransferase (AST)).
In some embodiments, provided herein is a method for treating a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising administering to the subject: (A) a rAAV comprising: (i) a rAAV vector comprising a nucleic acid comprising, in 5′ to 3′ order: (a) an AAV2 ITR; (b) a CMV enhancer; (c) a CBA promoter; (d) a transgene insert encoding a PGRN protein, wherein the transgene insert comprises the nucleotide sequence of SEQ ID NO: 68; (e) a WPRE; (f) a Bovine Growth Hormone polyA signal tail; and (g) an AAV2 ITR; and (ii) an AAV9 capsid protein; and (B) sirolimus, wherein the sirolimus is administered orally at a dose of about 6 mg in the range of 1 day to 3 days before administration of the rAAV; and at a dose of about 2 mg to maintain serum trough levels of from about 2 ng/mL to about 8 ng/mL for about 3 months after administration of the rAAV; and wherein the sirolimus administration is tapered during the 15 days to 30 days following the end of the 3-month period after administration of the rAAV.
The disclosure provides a method for treating a subject having or suspected of having FTD-GRN that combines (1) administration of a rAAV delivering a functional copy of the GRN gene encoding wild type PGRN with (2) administration of an immunosuppressant regimen. In some embodiments, the immunosuppressant regimen comprises administration of one or more of the following: sirolimus; methylprednisolone; an anti-CD20 antibody; and prednisone. In some embodiments, the immunosuppressant regimen comprises administration of all of the following: sirolimus; methylprednisolone; an anti-CD20 antibody; and prednisone. In some embodiments, the immunosuppressant regimen consists of administration of all of the following: sirolimus; methylprednisolone; an anti-CD20 antibody; and prednisone. In some embodiments, an anti-CD20 antibody is rituximab.
In some embodiments, the immunosuppressant regimen suppresses AAV-related and/or transgene protein expression-related immune responses in a subject. In some embodiments, the immunosuppressant regimen reduces an AAV9 capsid immune response in a subject. In some embodiments, the immunosuppressant regimen reduces a CSF inflammatory response in a subject.
Provided herein is a method for treating a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising administering to the subject: a recombinant adeno-associated virus (rAAV) comprising: (i) a rAAV vector comprising a nucleic acid comprising an expression construct comprising a promoter operably linked to a transgene insert encoding a progranulin (PGRN) protein, wherein the transgene insert comprises the nucleotide sequence of SEQ ID NO: 68; and (ii) an adeno-associated virus (AAV) 9 capsid protein; and one or more of the following: (A) sirolimus; (B) methylprednisolone; (C) rituximab; and (D) prednisone.
Also provided herein is a method for treating a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising administering to the subject: a recombinant adeno-associated virus (rAAV) comprising: (i) a rAAV vector comprising a nucleic acid comprising, in 5′ to 3′ order: (a) an adeno-associated virus (AAV) 2 ITR; (b) a cytomegalovirus (CMV) enhancer; (c) a chicken beta actin (CBA) promoter; (d) a transgene insert encoding a progranulin (PGRN) protein, wherein the transgene insert comprises the nucleotide sequence of SEQ ID NO: 68; (e) a Woodchuck Hepatitis Virus Posttranscriptional Regulatory Element (WPRE); (f) a Bovine Growth Hormone polyA signal tail; and (g) an AAV2 inverted terminal repeat (ITR); and (ii) an AAV9 capsid protein; and one or more of the following: (A) sirolimus; (B) methylprednisolone; (C) rituximab; and (D) prednisone.
Further provided herein is a method for suppressing an immune response in a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising administering to the subject: a recombinant adeno-associated virus (rAAV) comprising: (i) a rAAV vector comprising a nucleic acid comprising an expression construct comprising a promoter operably linked to a transgene insert encoding a progranulin (PGRN) protein, wherein the transgene insert comprises the nucleotide sequence of SEQ ID NO: 68; and (ii) an adeno-associated virus (AAV) 9 capsid protein; and one or more of the following: (A) sirolimus; (B) methylprednisolone; (C) rituximab; and (D) prednisone.
Also provided herein is a method for suppressing an immune response in a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising administering to the subject: a recombinant adeno-associated virus (rAAV) comprising: (i) a rAAV vector comprising a nucleic acid comprising, in 5′ to 3′ order: (a) an adeno-associated virus (AAV) 2 ITR; (b) a cytomegalovirus (CMV) enhancer; (c) a chicken beta actin (CBA) promoter; (d) a transgene insert encoding a progranulin (PGRN) protein, wherein the transgene insert comprises the nucleotide sequence of SEQ ID NO: 68; (e) a Woodchuck Hepatitis Virus Posttranscriptional Regulatory Element (WPRE); (f) a Bovine Growth Hormone polyA signal tail; and (g) an AAV2 inverted terminal repeat (ITR); and (ii) an AAV9 capsid protein; and one or more of the following: (A) sirolimus; (B) methylprednisolone; (C) rituximab; and (D) prednisone.
In methods disclosed herein for suppressing an immune response in a subject, the immunosuppression is produced by the immunosuppressants (e.g., sirolimus, methylprednisolone, an anti-CD20 antibody and prednisone) and not by the gene therapy (e.g., rAAV).
In some embodiments, the methylprednisolone is administered intravenously at a dose of about 1000 mg one day before administration of the rAAV. In some embodiments, the methylprednisolone is administered intravenously at a dose of about 1000 mg on the same day as administration of the rAAV.
In some embodiments, the prednisone is administered orally (A) at a dose of about 30 mg per day for 14 days beginning on the day after the administration of about 1000 mg of the methylprednisolone; and (B) tapered during the 7 days following the end of the 14-day period of (A). In some embodiments, a longer prednisone taper is used over an additional 4 weeks in a subject presenting with ALT and/or AST>3×upper limit of normal (ULN) at the end of the initial 14-day taper.
In some embodiments, an anti-CD20 antibody (e.g., rituximab) is administered intravenously at a dose of about 1000 mg on any single day between 14 days before and 1 day before administration of the rAAV.
In some embodiments, the methylprednisolone is administered before the anti-CD20 antibody (e.g., rituximab) is administered. In some embodiments, the methylprednisolone is administered at least about 30 minutes before the anti-CD20 antibody (e.g., rituximab) is administered. In some embodiments, the methylprednisolone and the anti-CD20 antibody (e.g., rituximab) are both administered the day before administration of the rAAV; and the methylprednisolone is administered at least about 30 minutes before the anti-CD20 antibody (e.g., rituximab) is administered. In some embodiments, the anti-CD20 antibody (e.g., rituximab) is administered on any single day between 14 days before and 2 days before administration of the rAAV; and the methylprednisolone is administered intravenously at a dose of about 100 mg at least about 30 minutes before the anti-CD20 antibody (e.g., rituximab) is administered on the same day as the anti-CD20 antibody (e.g., rituximab) is administered.
In some embodiments, the sirolimus is administered orally (A) as a single dose of about 6 mg three days, two days or one day before administration of the rAAV; and (B) at a dose of about 2 mg per day to maintain serum trough levels of from about 4 ng/ml to about 9 ng/mL for about 90 days after administration of the rAAV; wherein the first dose of about 2 mg per day of the sirolimus is administered the day after the single dose of about 6 mg of the sirolimus. In some embodiments, the sirolimus administration is tapered during the 15 days to 30 days following the end of the 90-day period after administration of the rAAV.
Provided herein is a method for treating a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising:
Provided herein is a method for suppressing an immune response in a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising:
Provided herein is a method for treating a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising:
Provided herein is a method for suppressing an immune response in a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising:
In some embodiments, the subject's immune response is an immune response to the rAAV. In some embodiments, the immune response is a T cell response. In some embodiments, the immune response is a B cell response. In some embodiments, the immune response is an antibody response. In some embodiments, the immune response is pleocytosis. In some embodiments, the pleocytosis is cerebrospinal fluid (CSF) pleocytosis. In some embodiments, the immune response is an abnormal level of CSF protein. In some embodiments, an abnormal level of CSF protein is greater than 70 mg/dL.
In some embodiments, prophylactic IV corticosteroid treatment (which targets both T-cells and B-cells) begins the day before treatment with the rAAV, and oral treatment continues for 14 days, followed by a taper over 7 days. Sirolimus treatment, which primarily targets T-cells, begins the day before treatment with the rAAV and will continue for 90 days followed by a taper. Rituximab, which primarily targets B-cells, is dosed once, preferably the day before treatment with the rAAV, and its activity is expected to persist for 6 months.
In some embodiments, a subject receives an immunosuppression regimen consisting of corticosteroids, rituximab, and sirolimus. A subject receives a loading dose of methylprednisolone 1000 mg IV pulse on Day −1 (allowed at Day −1 or Day 0). Prednisone at a dose of 30 mg/day is given orally as concomitant medication from the day after 1000 mg IV methylprednisolone pulse (Day 0 or Day 1) for 14 days and is then tapered over the ensuing 7 days. A subject receives a 1-time dose of 1000 mg rituximab IV on any single day between Day −14 and Day −1. In order to mitigate the risk and severity of infusion-related reaction (IRR) associated with rituximab, a subject receives IV methylprednisolone before receiving IV rituximab. For rituximab dose administration on Day −1, a subject receives a rituximab infusion at least 30 minutes after the 1000 mg IV methylprednisolone pulse described above. For rituximab dose administration between Day −14 and Day −2, a subject receives a 100 mg methylprednisolone IV infusion approximately 30 minutes before receiving the IV rituximab. A subject receives a sirolimus oral loading dose of 6 mg at Day −1 (window of Day −3 to Day −1). A subsequent sirolimus oral maintenance dose of 2 mg/day is provided as concomitant medication starting at Day 0 (or the day after the sirolimus loading dose, if the sirolimus loading dose is administered at Day −3 or Day −2) and adjusted as needed for 90 days to maintain serum trough levels of 6 ng/mL (range 4-9 ng/mL) for 90 days. Sirolimus is then tapered over the ensuing 15 to 30 days. Higher doses or a longer taper of corticosteroids and sirolimus may be used.
In some embodiments, a longer taper, or re-initiation of immunosuppressive treatment may be used (e.g., in cases of elevated AST or ALT, inflammatory changes in the CSF, or other suspected immune system reactions).
In some embodiments, an additional immunosuppressant that is not sirolimus, methylprednisolone, rituximab or prednisone is further administered to the subject.
In some embodiments, a method disclosed herein may comprise an increase in doses of the immunosuppressant agent, a prolonged tapering regimen, use of an additional agent, or re-initiation of treatment based on clinical signs or symptoms consistent with an immune response, for example:
The amount of composition (e.g., a composition comprising an isolated nucleic acid or a vector or a rAAV) as described by the disclosure administered to a subject will vary depending on the administration method. For example, in some embodiments, a rAAV as described herein is administered to a subject at a titer between about 109 Genome copies (GC)/kg and about 1014 GC/kg (e.g., about 109 GC/kg, about 1010 GC/kg, about 1011 GC/kg, about 1012 GC/kg, about 1012 GC/kg, or about 1014 GC/kg). In some embodiments, a subject is administered a high titer (e.g., >1012 Genome Copies GC/kg of an rAAV) by injection to the CSF space, or by intraparenchymal injection. In some embodiments, a rAAV as described herein is administered to a subject at a dose ranging from about 1×1010 vector genomes (vg) to about 1×1017 vg by intravenous injection. In some embodiments, a rAAV as described herein is administered to a subject at a dose ranging from about 1×1010 vg to about 1×1016 vg by injection into the cisterna magna.
A composition (e.g., a composition comprising an isolated nucleic acid or a vector or a rAAV) as described by the disclosure can be administered to a subject once or multiple times (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, or more) times. In some embodiments, a composition is administered to a subject continuously (e.g., chronically), for example via an infusion pump.
AAV vectors are generated using cells, such as HEK293 cells for triple-plasmid transfection. The ITR sequences flank an expression construct comprising a promoter/enhancer element for each transgene of interest, a 3′ polyA signal, and posttranslational signals such as the WPRE element. Multiple gene products can be expressed simultaneously such as GBA1 and LIMP2 and/or Prosaposin, by fusion of the protein sequences; or using a 2A peptide linker, such as T2A or P2A, which leads 2 peptide fragments with added amino acids due to prevention of the creation of a peptide bond; or using an IRES element; or by expression with 2 separate expression cassettes. The presence of a short intronic sequence that is efficiently spliced, upstream of the expressed gene, can improve expression levels. shRNAs and other regulatory RNAs can potentially be included within these sequences. Examples of expression constructs described by the disclosure are shown in
Cells deficient in GBA1 are obtained, for example as fibroblasts from GD patients, monocytes, or hES cells, or patient-derived induced pluripotent stem cells (iPSCs). These cells accumulate substrates such as glucosylceramide and glucosylsphingosine (GlcCer and GlcSph). Treatment of wild-type or mutant cultured cell lines with Gcase inhibitors, such as CBE, is also be used to obtain GBA deficient cells.
Using such cell models, lysosomal defects are quantified in terms of accumulation of protein aggregates, such as of α-Synuclein with an antibody for this protein or phospho-αSyn, followed by imaging using fluorescent microscopy. Imaging for lysosomal abnormalities by ICC for protein markers such as LAMP1, LAMP2, LIMP1, LIMP2, or using dyes such as Lysotracker, or by uptake through the endocytic compartment of fluorescent dextran or other markers is also performed. Imaging for autophagy marker accumulation due to defective fusion with the lysosome, such as for LC3, can also be performed. Western blotting and/or ELISA is used to quantify abnormal accumulation of these markers. Also, the accumulation of glycolipid substrates and products of GBA1 is measured using standard approaches.
Therapeutic endpoints (e.g., reduction of PD-associated pathology) are measured in the context of expression of transduction of the AAV vectors, to confirm and quantify activity and function. Gcase can is also quantified using protein ELISA measures, or by standard Gcase activity assays.
This example describes in vivo assays of AAV vectors using mutant mice. In vivo studies of AAV vectors as above in mutant mice are performed using assays described, for example, by Liou et al. (2006) J Biol. Chem. 281(7): 4242-4253, Sun et al. (2005) J. Lipid Res. 46:2102-2113, and Farfel-Becker et al. (2011) Dis. Model Mech. 4(6):746-752.
The intrathecal or intraventricular delivery of vehicle control and AAV vectors (e.g., at a dose of 2×1011 vg/mouse) are performed using concentrated AAV stocks, for example at an injection volume between 5-10 μL. Intraparenchymal delivery by convection enhanced delivery is performed.
Treatment is initiated either before onset of symptoms, or subsequent to onset. Endpoints measured are the accumulation of substrate in the CNS and CSF, accumulation of Gcase enzyme by ELISA and of enzyme activity, motor and cognitive endpoints, lysosomal dysfunction, and accumulation of α-Synuclein monomers, protofibrils or fibrils.
This example describes in vivo assays of AAV vectors using a chemically-induced mouse model of Gaucher disease (e.g., the CBE mouse model). In vivo studies of these AAV vectors are performed in a chemically-induced mouse model of Gaucher disease, for example as described by Vardi et al. (2016) J Pathol. 239(4):496-509.
Intrathecal or intraventricular delivery of vehicle control and AAV vectors (e.g., at a dose of 2×1011 vg/mouse) are performed using concentrated AAV stocks, for example with injection volume between 5-10 μL. Intraparenchymal delivery by convection enhanced delivery is performed. Peripheral delivery is achieved by tail vein injection.
Treatment is initiated either before onset of symptoms, or subsequent to onset. Endpoints measured are the accumulation of substrate in the CNS and CSF, accumulation of Gcase enzyme by ELISA and of enzyme activity, motor and cognitive endpoints, lysosomal dysfunction, and accumulation of α-Synuclein monomers, protofibrils or fibrils.
In some embodiments, patients having certain forms of Gaucher disease (e.g., GD1) have an increased risk of developing Parkinson's disease (PD) or Lewy body dementia (LBD). This Example describes clinical trials to assess the safety and efficacy of rAAVs as described by the disclosure, in patients having Gaucher disease, PD and/or LBD.
Clinical trials of such vectors for treatment of Gaucher disease, PD and/or LBD are performed using a study design similar to that described in Grabowski et al. (1995) Ann. Intern. Med. 122(1):33-39.
In some embodiments, patients having certain forms of Gaucher disease exhibit symptoms of peripheral neuropathy, for example as described in Biegstraaten et al. (2010) Brain 133(10):2909-2919.
This example describes in vivo assays of AAV vectors as described herein for treatment of peripheral neuropathy associated with Gaucher disease (e.g., Type 1 Gaucher disease). Briefly, Type 1 Gaucher disease patients identified as having signs or symptoms of peripheral neuropathy are administered a rAAV as described by the disclosure. In some embodiments, the peripheral neuropathic signs and symptoms of the subject are monitored, for example using methods described in Biegstraaten et al., after administration of the rAAV.
Levels of transduced gene products as described by the disclosure present in patients (e.g., in serum of a patient, in peripheral tissue (e.g., liver tissue, spleen tissue, etc.)) of a patient are assayed, for example by Western blot analysis, enzymatic functional assays, or imaging studies.
This example describes in vivo assays of rAAVs as described herein for treatment of CNS forms of Gaucher disease. Briefly, Gaucher disease patients identified as having a CNS form of Gaucher disease (e.g., Type 2 or Type 3 Gaucher disease) are administered a rAAV as described by the disclosure. Levels of transduced gene products as described by the disclosure present in the CNS of patients (e.g., in serum of the CNS of a patient, in cerebrospinal fluid (CSF) of a patient, or in CNS tissue of a patient) are assayed, for example by Western blot analysis, enzymatic functional assays, or imaging studies.
This example describes administration of a recombinant adeno-associated virus (rAAV) encoding GBA1 to a subject having Parkinson's disease characterized by a mutation in GBA1 gene.
The rAAV-GBA1 vector insert contains the CBA promoter element (CBA), consisting of four parts: the CMV enhancer (CMVe), CBA promoter (CBAp), Exon 1, and intron (int) to constitutively express the codon optimized coding sequence (CDS) of human GBA1 (maroon). The 3′ region also contains a Woodchuck hepatitis virus Posttranscriptional Regulatory Element (WPRE) posttranscriptional regulatory element followed by a bovine Growth Hormone polyA signal (bGH polyA) tail. The flanking ITRs allow for the correct packaging of the intervening sequences. Two variants of the 5′ ITR sequence (
rAAV-GBA1 is administered to a subject as a single dose via a fluoroscopy guided sub-occipital injection into the cisterna magna (intracisternal magna; ICM). One embodiment of a rAAV-GBA1 dosing regimen study is as follows:
A single dose of rAAV-GBA1 is administered to patients (N=12) at one of two dose levels (3e13 vg (low dose); 1e14 vg (high dose), etc.) which are determined based on the results of nonclinical pharmacology and toxicology studies.
Initial studies were conducted in a chemical mouse model involving daily delivery of conduritol-b-epoxide (CBE), an inhibitor of GCase to assess the efficacy and safety of the rAAV-GBA1 vector and a rAAV-GBA1 S-variant construct (as described further below). Additionally, initial studies were performed in a genetic mouse model, which carries a homozygous GBA1 mutation and is partially deficient in saposins (4L/PS-NA). Additional dose-ranging studies in mice and nonhuman primates (NHPs) are conducted to further evaluate vector safety and efficacy.
Two slightly different versions of the 5′ inverted terminal repeat (ITR) in the AAV backbone were tested to assess manufacturability and transgene expression (
To establish the CBE model of GCase deficiency, juvenile mice were dosed with CBE, a specific inhibitor of GCase. Mice were given CBE by IP injection daily, starting at postnatal day 8 (P8). Three different CBE doses (25 mg/kg, 37.5 mg/kg, 50 mg/kg) and PBS were tested to establish a model that exhibits a behavioral phenotype (
Mice surviving to the end of the study were sacrificed on the day after their last CBE dose (P27, “Day 1”) or after three days of CBE withdrawal (P29, “Day 3”). Lipid analysis was performed on the cortex of mice given 25 mg/kg CBE to evaluate the accumulation of GCase substrates in both the Day 1 and Day 3 cohorts. GluSph and GalSph levels (measured in aggregate in this example) were significantly accumulated in the CBE-treated mice compared to PBS-treated controls, consistent with GCase insufficiency.
Based on the study described above, the 25 mg/kg CBE dose was selected since it produced behavioral deficits without impacting survival. To achieve widespread GBA1 distribution throughout the brain and transgene expression during CBE treatment, rAAV-GBA1 or excipient was delivered by intracerebroventricular (ICV) injection at postnatal day 3 (P3) followed by daily IP CBE or PBS treatment initiated at P8 (
CBE-treated mice that received rAAV-GBA1 performed statistically significantly better on the rotarod than those that received excipient (
At the completion of the in-life study, half of the mice were sacrificed the day after the last CBE dose (P36, “Day 1”) or after three days of CBE withdrawal (P38, “Day 3”) for biochemical analysis (
Lipid levels were negatively correlated with both GCase activity and performance on the Rotarod across treatment groups. The increased GCase activity after rAAV-GBA1 administration was associated with substrate reduction and enhanced motor function (
A larger study in the CBE model further explored efficacious doses of rAAV-GBA1 in the CBE model. Using the 25 mg/kg CBE dose model, excipient or rAAV-GBA1 was delivered via ICV at P3, and daily IP PBS or CBE treatment initiated at P8. Given the similarity between the groups with and without CBE withdrawal observed in the previous studies, all mice were sacrificed one day after the final CBE dose (P38-40). The effect of three different rAAV-GBA1 doses was assessed, resulting in the following five groups, with 10 mice (5M/5F) per group:
The highest dose of rAAV-GBA1 rescued the CBE treatment-related failure to gain weight at P37. Additionally, this dose resulted in a statistically significant increase in performance on the rotarod and tapered beam compared to the Excipient+CBE treated group (
At the completion of the in-life study, mice were sacrificed for biochemical analysis (
In addition to the established chemical CBE model, rAAV-GBA1 is also evaluated in the 4L/PS-NA genetic model, which is homozygous for the V394L GD mutation in Gba1 and is also partially deficient in saposins, which affect GCase localization and activity. These mice exhibit motor strength, coordination, and balance deficits, as evidenced by their performance in the beam walk, rotarod, and wire hang assays. Typically the lifespan of these mice is less than 22 weeks. In an initial study, 3 μl of maximal titer virus was delivered by ICV at P23, with a final dose of 2.4e10 vg (6.0e10 vg/g brain). With 6 mice per group, the treatment groups were:
Motor performance by the beam walk test was assessed 4 weeks post-rAAV-GBA1 delivery. The group of mutant mice that received rAAV-GBA1 showed a trend towards fewer total slips and fewer slips per speed when compared to mutant mice treated with excipient, restoring motor function to near WT levels (
Additional lower doses of rAAV-GBA1 are currently being tested using the CBE model, corresponding to 0.03×, 0.1×, and 1× the proposed phase 1 high clinical dose. Each group includes 10 mice (5M/5F) per group:
In addition to motor phenotypes, lipid levels and GCase activity are assessed in the cortex. Time course of treatments and analyses are also performed.
A larger dose ranging study was initiated to evaluate efficacy and safety data. 10 4L/PS-NA mice (5M/5F per group) were injected with 10 μl of rAAV-GBA1. Using an allometric brain weight calculation, the doses correlate to 0.15×, 1.5×, 4.4×, and 14.5× the proposed phase 1 high clinical dose. The injection groups consist of:
rAAV constructs were tested in vitro and in vivo.
A pilot study was performed to assess in vitro activity of rAAV vectors encoding Prosaposin (PSAP) and SCARB2, alone or in combination with GBA1 and/or one or more inhibitory RNAs. One construct encoding PSAP and progranulin (PGRN) was also tested. Vectors tested include those shown in Table 3. “Opt” refers to a nucleic acid sequence codon optimized for expression in mammalian cells (e.g., human cells).
A pilot study was performed to assess in vitro activity of rAAV vectors encoding TREM2, alone or in combination with one or more inhibitory RNAs. Vectors tested include those shown in Table 3. “Opt” refers to a nucleic acid sequence codon optimized for expression in mammalian cells (e.g., human cells).
Human embryonic kidney 293 cell line (HEK293) were used in this study (#85120602, Sigma-Aldrich). HEK293 cells were maintained in culture media (D-MEM [#11995065, Thermo Fisher Scientific] supplemented with 10% fetal bovine serum [FBS] [#10082147, Thermo Fisher Scientific]) containing 100 units/ml penicillin and 100 μg/ml streptomycin (#15140122, Thermo Fisher Scientific).
Plasmid transfection was performed using Lipofectamine 2000 transfection reagent (#11668019, Thermo Fisher Scientific) according to the manufacture's instruction. Briefly, HEK293 cells (#12022001, Sigma-Aldrich) were plated at the density of 3×105 cells/ml in culture media without antibiotics. On the following day, the plasmid and Lipofectamine 2000 reagent were combined in Opti-MEM solution (#31985062, Thermo Fisher Scientific). After 5 minutes, the mixtures were added into the HEK293 culture. After 72 hours, the cells were harvested for RNA or protein extraction, or subjected to the imaging analyses. For imaging analyses, the plates were pre-coated with 0.01% poly-L-Lysine solution (P8920, Sigma-Aldrich) before the plating of cells.
Gene Expression Analysis by Quantitative Real-Time PCR (qRT-PCR)
Relative gene expression levels were determined by quantitative real-time PCR (qRT-PCR) using Power SYBR Green Cells-to-CT Kit (#4402955, Thermo Fisher Scientific) according to the manufacturer's instruction. The candidate plasmids were transiently transfected into HEK293 cells plated on 48-well plates (7.5×104 cells/well) using Lipofectamine 2000 transfection reagent (0.5 μg plasmid and 1.5 μl reagent in 50 μl Opti-MEM solution). After 72 hours, RNA was extracted from the cells and used for reverse transcription to synthesize cDNA according to the manufacturer's instruction. For quantitative PCR analysis, 2-5 μl of cDNA products were amplified in duplicates using gene specific primer pairs (250 nM final concentration) with Power SYBR Green PCR Master Mix (#4367659, Thermo Fisher Scientific). The primer sequences for SNCA, TMEM106B, and GAPDH genes were: 5′-AAG AGG GTG TTC TCT ATG TAG GC-3′ (SEQ ID NO: 71), 5′-GCT CCT CCA ACA TTT GTC ACT T-3′ (SEQ ID NO: 72) for SNCA, 5′-ACA CAG TAC CTA CCG TTA TAG CA-3′ (SEQ ID NO: 73), 5′-TGT TGT CAC AGT AAC TTG CAT CA-3′ (SEQ ID NO: 74) for TMEM106B, and 5′-CTG GGC TAC ACT GAG CAC C-3′ (SEQ ID NO: 75), 5′-AAG TGG TCG TTG AGG GCA ATG-3′ (SEQ ID NO: 76) for GAPDH. Quantitative PCR was performed in a QuantStudio 3 Real-Time PCR system (Thermo Fisher Scientific). Expression levels were normalized by the housekeeping gene GAPDH and calculated using the comparative CT method.
EGFP reporter plasmids, which contain 3′-UTR of human SNCA gene at downstream of EGFP coding region, were used for the validation of SNCA and TMEM106B knockdown plasmids. EGFP reporter plasmids and candidate knockdown plasmids were simultaneously transfected into HEK293 cells plated on poly-L-Lysine coated 96-well plates (3.0×104 cells/well) using Lipofectamine 2000 transfection reagent (0.04 μg reporter plasmid, 0.06 μg knockdown plasmid and 0.3 μl reagent in 10 μl Opti-MEM solution). After 72 hours, the fluorescent intensities of EGFP signal were measured at excitation 488 nm/emission 512 nm using Varioskan LUX multimode reader (Thermo Fisher Scientific). Cells were fixed with 4% PFA at RT for 10 minutes, and incubated with D-PBS containing 40 μg/ml 7-aminoactinomycin D (7-AAD) for 30 min at RT. After washing with D-PBS, the fluorescent intensities of 7-AAD signal were measured at excitation 546 nm/emission 647 nm using Varioskan reader to quantify cell number. Normalized EGFP signal per 7-AAD signal levels were compared with the control knockdown samples.
α-Synuclein reporter plasmids, which contain 3′-UTR of human SNCA gene or TMEM106B gene downstream of SNCA coding region, were used for the validation of knockdown plasmids at the protein level. Levels of α-synuclein protein were determined by ELISA (#KHB0061, Thermo Fisher Scientific) using the lysates extracted from HEK293 cells. The candidate plasmids were transiently transfected into HEK293 cells plated on 48-well plates (7.5×104 cells/well) using Lipofectamine 2000 transfection reagent (0.1 μg reporter plasmid, 0.15 μg knockdown plasmid and 0.75 μl reagent in 25 μl Opti-MEM solution). After 72 hours, cells were lysed in radioimmunoprecipitation assay (RIPA) buffer (#89900, Thermo Fisher Scientific) supplemented with protease inhibitor cocktail (#P8340, Sigma-Aldrich), and sonicated for a few seconds. After incubation on ice for 30 min, the lysates were centrifuged at 20,000×g at 4° C. for 15 min, and the supernatant was collected. Protein levels were quantified. Plates were read in a Varioskan plate reader at 450 nm, and concentrations were calculated using SoftMax Pro 5 software. Measured protein concentrations were normalized to total protein concentration determined with a bicinchoninic acid assay (#23225, Thermo Fisher Scientific).
The effect of placement of ITR “D” sequence on cell transduction of rAAV vectors was investigated. HEK293 cells were transduced with Gcase-encoding rAAVs having 1) wild-type ITRs (e.g., “D” sequences proximal to the transgene insert and distal to the terminus of the ITR) or 2) ITRs with the “D” sequence located on the “outside” of the vector (e.g., “D” sequence located proximal to the terminus of the ITR and distal to the transgene insert), as shown in
Mice are injected at 2 months or 6 months of age, and aged to 6 months or 12 months and analyzed for one or more of the following: expression level of GRN at the RNA and protein levels, behavioral assays (e.g., improved movement), survival assays (e.g., improved survival), microglia and inflammatory markers, gliosis, neuronal loss, Lipofuscinosis, and/or Lysosomal marker accumulation rescue, such as LAMP1. Assays on PGRN-deficient mice are described, for example by Arrant et al. (2017) Brain 140: 1477-1465; Arrant et al. (2018) J. Neuroscience 38(9):2341-2358; and Amado et al. (2018) doi:https://doi.org/10.1101/30869; the entire contents of which are incorporated herein by reference.
In vitro and in vivo assays were performed to analyze the effects of an rAAV construct (PR006 (also referred to as PR006A); see
Progranulin Expression Derived from PR006A in HEK293T Cells
The ability of PR006A to induce progranulin protein production in a cellular context was investigated. HEK293T cells were transduced with PR006A over a range of multiplicities of infection (MOI) ranging from 2.1×105 to 3.3×106 vector genomes (vg)/cell. PR006A transduction resulted in a robust, dose-dependent increase in progranulin protein expression and secretion into the cell media (
Efficacy in FTD-GRN iPSC-Derived Neurons
An assay was performed to analyze the efficacy of the rAAV construct in vitro in human FTD-GRN (Frontotemporal dementia with GRN mutation) neuronal cultures. Cell lines were obtained from the National Institute of Neurological Disorders and Stroke (NINDS) Human Cell and Data Repository (NHCDR): Materials ND50015 (FTD-GRN, MiL), ND50060 (FTD-GRN, R493X) and ND38555 (control, wild-type) (see Table 6).
To establish a cellular model that is pathologically relevant to FTD-GRN, iPSCs from each line were differentiated into neuronal cells using a two-step protocol. In the first step, iPSCs were differentiated into proliferating neuronal stem cell (NSC) lines, which lacked expression of pluripotency markers (i.e., Oct4 and SSEA1) and gained expression of neuronal stem cell markers (i.e., SOX2, Nestin, SOX1, and PAX6), as detected by immunofluorescence labeling.
Control and FTD-GRN NSC lines were seeded at an equal density, and 48 hours later, progranulin expression was measured by an enzyme-linked immunosorbent assay (ELISA) in cell lysates (intracellular progranulin) (
NSCs from all cell lines were differentiated into neuronal cultures. After establishing that the iPSC-derived NSCs exhibit reduced progranulin expression, the lines were differentiated into neurons to generate a clinically representative cell type for nonclinical efficacy studies of PR006A. NSCs were seeded into neuronal differentiation media, terminally differentiated into postmitotic neurons for a period of 7 days, and then assessed for expression of neuronal markers (i.e., MAP2, NeuN, Tau, Tuj 1, NF-H) by immunofluorescence (
FTD-GRN iPSC-derived neuronal cultures were used to evaluate the efficacy of PR006A in vitro. FTD-GRN neurons were treated with excipient or PR006A at MOIs of 2.7×105, 5.3×105, or 1.1×106 vg/cell. PR006 transduction resulted in a robust, dose-dependent expression of secreted progranulin, as measured by ELISA, in all cell lines (
Progranulin is known to stimulate maturation of the lysosomal protease cathepsin D (CTSD), whose loss of function has also been implicated in lysosomal storage disorders and neurodegeneration. CTSD is expressed as an inactive full-length pro-protein (proCTSD) that undergoes proteolytic processing into an enzymatically active mature protease (matCTSD). Progranulin has been reported to act as a molecular chaperone that binds to proCTSD to enhance its maturation into the matCTSD protease. In FTD-GRN neuronal cultures, PR006 transduction rescued the defective maturation of cathepsin D (
In normal neurons, TDP-43 (transactive response DNA binding protein 43 kDa) protein is localized in the nucleus. In post-mortem brains of FTD-GRN patients, aggregation of TDP-43 in the cytoplasm of neurons is observed, and nuclear accumulation of TDP-43 is reduced. FTD neurons have decreased nuclear TDP-43, leading to aggregation and downstream toxicity in neurons. Since Grn KO mice do not fully recapitulate this TDP-43 pathology, induced pluripotent stem cell (iPSC)-derived neurons are a valuable FTD-GRN model to study TDP-43 biology. Decreased accumulation of TDP-43 in the nucleus, and increased accumulation of insoluble TDP-43, have been reported in iPSC-derived neurons from patients with FTD-GRN, relative to control neurons that do not carry a GRN mutation, as described by Valdez et al. (Human Molecular Genetics 26, 4861-4872 (2017)). PR006A transduction of neuronal cultures from both FTD-GRN mutation carrier lines reversed TDP-43 abnormalities, resulting in decreased insoluble TDP-43 (measured using the Simple Western™ (Jess) platform (
To summarize, PR006 transduction restored defective maturation in the lysosomal enzyme, cathepsin D, and improved abnormal TDP-43 pathology in FTD-GRN neurons.
PR006A efficacy in vivo and the maximal dose PR006A were evaluated in the Grn knockout (KO) mouse model. In the Grn KO mouse model used in these studies (B6(Cg)-Grntm1.1Aidi/J (Jackson Laboratory, Bar Harbor, ME), exons 1-4 are deleted from the target progranulin (Grn) gene (Yin et al., J Exp Med 207, 117-128 (2010)). These animals have a complete loss of progranulin, display age-dependent phenotypes including lysosomal alterations, neuronal lipofuscin accumulation, ubiquitin accumulation, microgliosis, and neuroinflammation, and are therefore widely used to model FTD-GRN. All attempts were made to eliminate bias from the study; mice were assigned to treatment groups that were balanced for gender and body weight, and a blinded assessment of experimental endpoints was conducted by qualified personnel.
In the initial studies, PR006A was delivered to aged Grn KO mice at a dose of 9.7×1010 vg (2.4×1011 vg/g brain), which was the highest achievable dose at the time of the study due to injection volume constraints and the physical titer of the virus lot used for the study. Aged mice were used since many of the FTD-GRN-related phenotypes, including CNS inflammation and microgliosis, develop in an age dependent manner, with the most pronounced manifestation of phenotypes occurring between 12-24 months of age.
In the studies with aged Grn KO mice, PR006A was administered by single intracerebroventricular (ICV) injection. 10 μl excipient (the intended clinical vehicle; 20 mM Tris pH 8.0, 200 mM NaCl, and 1 mM MgCl2+0.001% Pluronic F68) or 9.7×1010 vg PR006A (2.4×1011 vg/g brain [based on an adult mouse brain weight of 400 mg]) was delivered by ICV injection into two cohorts of aged Grn KO mice: (1) 16-months-old at time of injection (n=4/group; PRV-2018-027;
In study PRV-2018-027, a single dose of PR006A was delivered to 16-month-old mice with the following treatment groups:
Due to unforeseen study deviations (errors in genotyping and premature loss of animals), study PRV-2019-002 (14-month-old cohort) enrolled only 1 mouse in the excipient-treated group instead of the planned n=3. The low sample number made statistical analysis impossible, and therefore this study is excluded from further discussion here. However, the findings from the study were comparable to those from study PRV-2018-027.
Biodistribution and Progranulin Expression: Biodistribution was determined by measuring vector genome presence using a qPCR assay that meets the current U.S. Food and Drug Administration Center for Biologics Evaluation and Research (CBER)/Office of Tissues and Advanced Therapies (OTAT) standards for PCR sensitivity (with >50 vector genomes per 1 μg genomic DNA defined as positive). All mice that received PR006A were positive for vector genomes in the cerebral cortex and spinal cord, indicating that ICV administration successfully results in PR006A transduction in the brain and CNS (
ICV administration also resulted in broad vector genome presence and progranulin protein levels in peripheral tissues, including liver, heart, lung, kidney, spleen, and gonads (
Lipofuscin Accumulation: Accumulation of neuronal lipofuscin, an electron-dense, autofluorescent material that accumulates progressively over time in lysosomes of postmitotic cells and is an indicator of lysosomal dysfunction, is a hallmark age-dependent phenotype of Grn KO mice. Lipofuscin accumulation was assessed using two independent methods in adjacent brain sections: (1) in a more clinical approach, lipofuscin accumulation in the brain was scored by a blinded pathologist on a scale of 0 (no lipofuscin observed) to 4 (widespread lipofuscin accumulation) and (2) in a more quantitative approach, lipofuscin autofluorescence was detected by immunohistochemistry (IHC) and automatically quantified. Grn KO mice exhibited substantial lipofuscinosis throughout the brain, and ICV PR006A treatment reduced the lipofuscin score severity in the cerebral cortex, hippocampus, and thalamus (
Neuroinflammation: Chronic CNS inflammation is a pathological feature in the brain of patients with FTD-GRN that is recapitulated in Grn KO mice in an age-dependent manner. Progranulin has anti-inflammatory effects in mouse models of FTD-GRN, and loss of progranulin leads to upregulation of proinflammatory cytokines, including TNFα. In this study, treatment with PR006A suppressed inflammatory marker levels in aged Grn KO mice. ICV PR006A decreased gene expression of the proinflammatory cytokine Tnf (TNFα) and Cd68 (CD68), a marker of microglia, in the cerebral cortex (
Histopathology: thorough histopathological analysis by a blinded board-certified pathologist of hematoxylin and eosin (H&E) staining of the brain, thoracic spinal cord, liver, heart, spleen, lung, and kidney of all mice from these studies revealed no adverse events related to PR006A treatment. Administration of PR006A to Grn KO mice resulted in a decreased incidence and/or severity of findings that are characteristic of the model, including a reduction in frequency and/or severity scores of neuronal necrosis in the medulla and pons. Additionally, there was a reduction in both the incidence and severity of axonal degeneration in the thoracic spinal cord with PR006A treatment. These findings are discussed in detail in the Toxicology section below.
Conclusion: ICV PR006A at a dose of 9.7×1010 vg (2.4×1011 vg/g brain) resulted in broad vector genome presence throughout the brain and peripheral tissues in aged Grn KO mice. PR006A treatment increased global progranulin expression. In addition, PR006A reduced accumulation of lipofuscin and ubiquitin in the brain, pathologies known to occur in both the Grn KO mouse model and patients with FTD-GRN. PR006A also reduced the expression of proinflammatory cytokines and immune cell activation in the cerebral cortex, phenotypes that are indicative of chronic CNS inflammation.
To further assess efficacious doses of PR006A, a larger, dose-ranging study in adult Grn KO mice was performed. In PRV-2019-004, 10 μl excipient (the intended clinical vehicle; 20 mM Tris pH 8.0, 200 mM NaCl, and 1 mM MgCl2+0.001% Pluronic F68) or PR006A was delivered via ICV to 4-month-old animals. These adult mice were used instead of the aged Grn KO mice because the latter were not available in sufficient numbers for conducting a dose-ranging study. While the adult Grn KO mice have a milder phenotype than aged mice, they still exhibit lysosomal defects and neuroinflammatory changes and therefore are suitable for evaluating the efficacious dose range of PR006A. In order to assess PR006A efficacy over a broad range of viral doses, PR006A was administered at 1.1×1011 vg (2.7×1011 vg/g brain), the highest achievable dose at the time of the study due to injection volume constraints and the physical titer of the virus lot used for the study, a middle dose of 1.1×1010 vg (2.7×1010 vg/g brain), or a low dose of 1.1×109 vg (2.7×109 vg/g brain), with a full log difference spanning each dose. The details of the experimental design are given in
Three doses of PR006A were assessed, with 10 mice (4M/6F) per group:
Age-matched mice of the same background strain as the Grn KO mice with wildtype (WT) Grn alleles (7-month old C57BL/6J) served as controls for select efficacy endpoints in this study.
Biodistribution and Progranulin Expression: Biodistribution was determined by measuring vector genome presence using a qPCR assay that meets the current U.S. Food and Drug Administration CBER/OTAT standards for PCR sensitivity (with >50 vector genomes per g genomic DNA defined as positive). Mice that received PR006A were positive for vector genomes in the cerebral cortex and spinal cord in a dose-dependent manner, indicating that ICV administration successfully results in PR006A transduction in the CNS (
PR006A administration also resulted in broad vector genome presence and progranulin protein levels in peripheral tissues, including liver, heart, lung, kidney, spleen, and gonads (
In plasma, significant levels of human progranulin were detected in PR006A-treated Grn KO mice at all dose levels (
Lipofuscin Accumulation: Lipofuscin accumulation was assessed using two independent methods in adjacent brain sections: (1) in a more clinical approach, lipofuscin accumulation in the brain was scored by a blinded pathologist on a scale of 0 (no lipofuscin observed) to 4 (widespread lipofuscin accumulation) and (2) in a more quantitative approach, lipofuscin autofluorescence was detected by IHC and automatically quantified. Grn KO mice exhibited lipofuscinosis throughout the brain, whereas WT mice did not have detectable lipofuscin in the brain (
Neuroinflammation: Treatment with PR006A suppressed inflammatory marker levels in the brain of adult Grn KO mice. ICV PR006A decreased gene expression of the proinflammatory cytokine Tnf(TNFα) and Cd68 (CD68), a marker of microglia, in the cortex over a range of doses, from 2.7×109 vg/g brain to 2.7×1011 vg/g brain (
While many of the Grn KO mouse model phenotypes occur late in life, studies have reported that Grn KO mice exhibit widespread gene expression changes as early as 4 months of age, including changes in lysosomal- and immune-related pathways. Therefore, in addition to the targeted qRT-PCR analysis described above, a transcriptomics approach to evaluate changes in mRNA levels, which can be assessed globally with sensitive, high throughput technologies (RNA sequencing), and require minimal sample material, was employed. We performed RNA sequencing on cerebral cortices and used Gene Set Variation Analysis (GSVA) (Hanzelmann et al., BMC Bioinformatics 14, 7 (2013)) to determine which gene expression pathways are altered in the 7-month old excipient-treated Grn KO mice, as compared to age-matched WT mice of the same strain. We confirmed deficiencies in lysosomal- and immune-related pathways in mice lacking Grn, as reported in previously published studies. Significant changes were reported in a subset of the GO TERM (GO:0005773) “Vacuole” genes (contains 4 genes reported to be dysregulated in Grn KO mice described by Lui et al (Cell 165, 921-935 (2016))), the “Lysosomal Genes” set (a subset of 25 lysosomal-related genes shown to be dysregulated in Grn KO mice described by Evers et al (Cell Reports 20, 2565-2574 (2017))), and the “Complement” gene set from Gene Set Enrichment Analysis HALLMARK database (contains genes encoding components of the complement system, part of the innate immune system). We then measured and compared activity levels of these gene sets with PR006A treatment (
Histopathology: A thorough histopathological analysis performed by a blinded board-certified pathologist on hematoxylin and eosin (H&E) staining of the brain, thoracic spinal cord, liver, heart, spleen, lung, kidney, and gonads of all mice from these studies found no evidence of toxicity related to PR006A treatment. The details of the toxicity analysis are provided in the section below.
Conclusion: ICV PR006A at doses ranging from 2.7×109 vg/g brain to 2.7×1011 vg/g brain resulted in broad vector genome presence throughout the brain and peripheral tissues in a dose-dependent manner. PR006A treatment also led to production of progranulin mRNA and protein in the CNS. A clear dose-response relationship between PR006A and decreased lipofuscinosis, a readout of lysosomal dysfunction, was observed throughout multiple brain regions. A robust and statistically significant reduction of lipofuscinosis was observed at the middle and highest dose level of PR006A. All PR006A doses reduced ubiquitin accumulation in the brain. Starting at the lowest dose of 2.7×109 vg/g brain, PR006A reduced the expression of proinflammatory markers in the brain at the RNA and protein level.
PR006A effectively transduced Grn KO mice, resulting in a robust, dose-dependent biodistribution of the transgene and production of progranulin mRNA and protein in the CNS. PR006A dose-dependently reversed gene expression abnormalities in lysosomal and neuroinflammatory pathways. PR006A reduced many of the phenotypes that occur in the brain of this FTD-GRN mouse model, including lipofuscinosis, ubiquitin accumulation, and microgliosis. In the dose-ranging study, the lowest dose of 2.7×109 vg/g brain PR006A significantly suppressed the expression of inflammatory markers in the cerebral cortex. The middle dose of 2.7×1010 vg/g brain PR006A improved both lysosomal defects (e.g., lipofuscinosis) and neuroinflammation, in a robust and statistically significant way. The high dose of 2.7×1011 vg/g brain PR006A further increased progranulin expression with no evidence of toxicity.
Throughout these studies, there were no adverse events that can be attributed to the test article. Safety findings from in-life and histopathological analyses of the animals in PRV-2018-027, PRV-2019-002, and PRV-2019-004 are discussed in the section below.
A series of nonclinical studies with PR006A were conducted investigating safety endpoints in mice and monkeys. Three of the studies were performed in a Grn KO mouse model, where endpoints included neuropathological evaluations and assessed both protective activity as well as potential toxicity resulting from PR006A administration via intracerebroventricular (ICV) injection; ICM administration is more technically difficult in mice. These mouse models are representative of FTD-GRN in which patients have a mutation in the GRN gene resulting in reduced progranulin levels. In cynomolgus monkeys, neuropathology was also performed as part of a pilot study in which PR006A was injected into the cisterna magna (ICM). A GLP study was conducted in cynomolgus monkeys in which PR006A was delivered to the ICM, and monkeys were sacrificed at Day 7, Day 30, or Day 183. The GLP study incorporated a comprehensive list of clinical endpoints in addition to anatomical pathology evaluations on a full list of tissues. To support single-dose administration in the clinic, the following single-dose studies were conducted.
As part of these efficacy studies in Grn KO mice, neuropathological evaluations were conducted in mice treated ICV with either excipient or PR006A. Grn KO mice have a complete loss of progranulin and are widely used as models of FTD-GRN due to their age-dependent phenotypes, which include lysosomal alterations, neuronal lipofuscin accumulation, microgliosis, and neuroinflammation. Aspects of the pharmacology portions of the study are summarized in the sections above whereas toxicological-related endpoints assessed in this study are summarized below. Two studies of PR006A were conducted in the aged Grn KO mouse model. In the first study (PRV-2018-027), 9 mixed gender Grn KO mice 16 months of age received ICV administration of either PR006A or excipient. Animals were sacrificed 9 weeks post-administration. A single PR006A dose group was included in this study: 10 μl of undiluted virus, for a total dose of 9.7×1010 vg (2.4×1011 vg/g brain), and the control group was treated with 10 μl of excipient.
Various post-mortem endpoints, such as biodistribution, lysosomal alterations, and inflammatory markers, were evaluated as part of this study protocol (see section above). Animals were also checked for survival twice per day, and body weight was measured once per day. After euthanasia at 2-months post-treatment, target tissues were harvested, drop fixed in chilled 4% paraformaldehyde, and stored at 4° C. The tissues from the 8 animals that completed the study were trimmed, processed, and embedded in paraffin blocks. They were then sectioned at ˜5 μm, stained with hematoxylin and eosin (H&E) and examined by a board-certified veterinary pathologist.
During this study, 1 mouse died prematurely from the treatment group; no abnormalities were recorded for the deceased animal during necropsy, and therefore there is no known cause of death. No other deaths or abnormalities were observed. All treatment groups tracked similarly in terms of body weights, with no significant differences present.
On histopathological examination, there were no PR006A-related adverse findings. There was widespread lipofuscin accumulation in the brain, consistent with expected findings in a Grn KO mouse. In PR006A-treated animals, there was a reduction in the score severity for lipofuscin accumulation in all regions of the brain. Morphologic changes also appeared to demonstrate a slight reduction in frequency and/or severity scores, particularly with respect to neuronal necrosis in the medulla and pons, with PR006A treatment. However, these trends in the morphologic changes were not as consistent as that of the lipofuscin scores.
In the thoracic spinal cord, there was axonal degeneration and, very rarely (1 out of 4 animals in each group), minimal neuronal necrosis observed. There was a minor reduction in both the incidence and severity of axonal degeneration in the animals treated with PR006A.
The following findings, which are presumably associated with the Grn homozygous knockout mouse, appeared to have a reduced incidence and/or severity in the animals treated with PR006A: dilated tubules in the medulla of the kidney, glomerulopathy in the kidney, and foreign material in the lung (characterized as linear, acellular, dark pink structures, usually within airways and frequently associated with foreign body giant cells and/or macrophages). A larger cohort of animals would be necessary for more definitive conclusions.
All other histopathologic findings observed were considered incidental and/or were of similar incidence and severity in excipient- and test article-treated animals and, therefore, were considered unrelated to administration of PR006A.
In the second study (PRV-2019-002), 5 mixed gender Grn KO mice 14 months of age received ICV administration of either PR006A or excipient. Animals were sacrificed 8 weeks post-administration. A single PR006A dose group was included in this study: 10 μl of undiluted virus, for a total dose of 9.7×1010 vg (2.4×1011 vg/g brain), and the control group was treated with 10 μl of excipient.
The animals were analyzed in an identical manner to study PRV-2018-027. Animals were checked for survival twice per day, and body weight was measured once per day. After euthanasia at 2-months post-treatment, target tissues were harvested, drop fixed in chilled 4% paraformaldehyde, and stored at 4° C., until evaluation.
In the CNS, findings consistent with those previously observed in the Grn KO mouse were observed in the brain (Yin et al., J Exp Med 207(1):117-128 (2010)). Specifically, there was a widespread increase in lipofuscin accumulation throughout the brain. Rarely minimal neuronal necrosis was also observed (in the single untreated early death animal and in one Excipient animal).
Due to the low sample numbers it was not possible to demonstrate a consistent trend in the findings related to treatment. There was no consistent difference in response between the Test Article (PR006A) and Excipient.
For non-CNS tissues, findings that were considered to be consistent with the phenotype of the Grn KO mouse were observed in the kidney (tubular dilation and infiltrates of mononuclear inflammatory cells) and liver (vacuolation of Kupffer cells/sinusoidal lining cells, and Kupffer cell microgranulomas) (Yin et al., J Exp Med 207(1):117-128 (2010)).
There was a finding of “glomerulopathy” observed in all animals that underwent surgery and were enrolled in the study. While published reports of this finding as a change associated with standard, unchallenged, Grn knockout mice were not found, one study has demonstrated progranulin-deficient mice treated with a diet that induces hyperhomocysteinemia, develop glomerular basement membrane thickening and podocyte foot process effacement (Fu et al., Hypertension 69(2):259-266 (2017)).
All other findings were consistent with those commonly observed in laboratory mice. Due to the low sample number, no conclusive difference related to treatment could be shown.
To further assess the safety of PR006A, a larger, dose-ranging study in adult Grn KO mice was performed. A total of 40 mixed-gender mice were divided into 4 groups and administered either excipient or one of three doses of PR006A by a single unilateral ICV injection into the left hemisphere; all animals, regardless of treatment group, received a total dose volume of 10 μl. Mice were treated at 4 months of age and euthanized 3 months post-treatment. An additional wildtype (WT) control group, which included untreated C57BL/6J mice (the same background strain) aged to approximately 7 months, were also euthanized and subjected to a similar necropsy.
The study was conducted according to the study design below:
During the study, animals were checked for survival twice a day and weighed once a week. Mice were euthanized 3 months post-treatment, and various post-mortem evaluations were conducted to assess efficacy of PR006A (see section above). In addition, sections stained for H&E from brain, thoracic spinal cord, liver, heart, spleen, lung, kidney, and gonads were evaluated by a board-certified pathologist.
On histopathological examination, there were no adverse PR006A-related findings in any of the mice regardless of treatment group.
There were findings consistent with the Grn KO mouse model phenotype, such as accumulation of intracellular lipofuscin in various regions of the brain: cerebral cortex, cerebral nuclei, hippocampus, thalamus/hypothalamus, cerebellum and brainstem (particularly the pons and medulla). Clear evidence of morphologic changes on the H&E stained sections (vacuolation of neurons and gliosis) was not observed. Accumulation of lipofuscin pigment can precede easily detectable morphologic changes and, therefore, serves as an adequate biomarker of efficacy. While all Grn homozygous KO groups demonstrated lipofuscin accumulation, there were differences in the severity of this finding across treatment groups. The frequency of higher scores for lipofuscin accumulation was greatest for the group of animals treated with excipient (Group 1). Of those animals treated with PR006A, the frequency of higher scores were observed in Group 4 (low dose PR006A; 2.7×109 vg/g brain), followed by Group 3 (middle dose PR006A; 2.7×1010 vg/g brain). The lowest severity scores were observed with in Group 2 (high dose PR006A; 2.7×1011 vg/g brain). These findings demonstrate a dose-dependent reduction in the severity scores of intracellular lipofuscin accumulation in the brains of Grn homozygous knock-out mice. All other histopathologic findings were considered incidental and/or were of similar incidence and severity in excipient and test article-treated animals and, therefore, were considered unrelated to administration of PR006A.
Study Design
The purpose of this GLP study was to evaluate the toxicity and biodistribution of the test article, PR006A, when administered once via ICM injection in cynomolgus monkeys with a 6-day, 29-day, or 182-day post-administration observation period; animals were sacrificed at study Day 7, Day 30, or Day 183. The study was designed to evaluate 2 dose levels: the highest dose is the maximum feasible dose achievable with 1.2 mL volume (the highest volume there was experience in administering) of undiluted PR006A, and a lower dose that is equivalent to one log unit lower than the high dose. The doses equate to a low dose of 4.8×1011 vg and a high dose of 4.8×1012 vg; with a brain weight estimate of 74 g in a cynomolgus monkey, the NHP species used in this study, this translates to approximately 6.5×109 vg/g brain and 6.5×1010 vg/g brain. The study also includes a control arm in which animals receive 1.2 ml of excipient only (20 mM Tris pH 8.0, 200 mM NaCl, and 1 mM MgCl2+0.001% [w/v] Pluronic F68). This study utilized both male and female cynomolgus macaques. The Day 7 group included 1 female at the highest dose and was designed as a sentinel for early toxicity; the remaining two timepoints (Day 30 and Day 183) included 2 males and 1 female at each dose. In addition to samples from multiple brain regions, peripheral tissue samples were collected for qPCR analysis. All samples that were positive with qPCR were analyzed for transgene expression. A tabulated summary of this study's design is provided in Table 11.
a Organs (when present) will be weighed or noted as missing;
b Collected in modified Davidson's fixative and stored in 10% neutral buffered formalin
Cynomolgus NHPs were assessed by multiple in-life observations and measurements, including mortality/morbidity (daily), clinical observations (daily), body weight (baseline and weekly thereafter), visual inspection of food consumption (daily), neurological observations (baseline and during Week 2 and 26), indirect ophthalmoscopy (baseline and during Weeks 2 and 26), and electrocardiographic (ECG) measurement (baseline and during Weeks 2 and 26).
Analysis of neutralizing antibodies (nAb) to the AAV9 capsid was performed at baseline and at sacrifice on Days 7, 30, or 183. Clinical pathology consisting of hematology, coagulation, clinical chemistry, and urinalysis was performed twice at baseline (blood tests; once for urinalysis) and once during Weeks 1 and 13 of the dosing phase.
Animals were euthanized and tissues harvested on Day 7, Day 30, or Day 183. The tissues outlined in Table 11, if present, were collected from all animals, weighed (if applicable), and divided into replicates. One replicate was preserved in 10% neutral-buffered formalin (except when special fixatives are required for optimum fixation) for histopathological evaluation (all animals). Additional replicates were collected for qPCR and transgene expression analysis.
Safety and Toxicology
There were no unscheduled deaths, and all animals survived until the scheduled necropsy. There were no adverse PR006A-related clinical observations, body weight changes, ophthalmic observations, or physical or neurological examination findings; gross macroscopic examination at necropsy showed no drug-related abnormalities in any of the cohorts. In addition, there were no PR006A-related changes in PR interval, QRS duration, QT interval, corrected QT (QTc) interval, or heart rate observed in males or combined sexes administered 6.5×109 or 6.5×1010 vg/g brain. No abnormal ECG waveforms or arrhythmias were observed during the qualitative assessment of the ECGs.
Biodistribution
Biodistribution analysis of the PR006A transgene was performed using a qPCR-based assay. At Day 183 in the high dose group (6.5×1010 vg/g brain), there was widespread transduction throughout the CNS and periphery, with all tissues examined positive for vector presence with a cutoff of 50 vg/μg DNA, the lower limit of quantitation for the qPCR assay. Data from select representative regions from Day 183 are shown in
In the NHPs receiving ICM administration of PR006A, there was a significant allogeneic immune response to the transgene product, progranulin, with anti-progranulin antibodies detected in serum and CSF samples collected at Day 30 and Day 183 post-treatment; the immune response indicates that the human progranulin protein was expressed in the NHPs. The antidrug antibody (ADA) levels were determined using established immune assay technologies. The data are illustrated in
Expression of PR006A (GRN) was measured at the mRNA level using a RT-qPCR-based assay, and at the protein level using a Simple Western™ (Jess) analysis. Concomitant with levels of PR006A transduction, expression of the transgene was observed by mRNA measurements using RT-qPCR in select brain regions (
Expression of the transgene was measurable in brain and liver at both doses of PR006A, and the expression levels were both dose-dependent and durable. In gonads, expression was measurable in the males at the high dose only; at both doses in the females, expression was measurable at Day 7 and Day 30, but not at Day 183.
To confirm that human progranulin was produced in the treated NHPs, protein levels in CSF were evaluated on a Simple Western™ (Jess) platform. Details of the method are provided in Example 14. The method was qualified by measuring progranulin levels in CSF samples from FTD-GRN patients and establishing that they were approximately half of the levels measured in CSF samples from healthy human controls and from FTD patients without a GRN mutation. Results from the CSF indicate that levels of progranulin are elevated in a dose-dependent manner in animals treated with both the low and high doses of PR006A (
Progranulin protein measurements focused on CSF because the Simple Western™ (Jess) assay is not suitable to measure progranulin levels in brain tissue due to the high level of nonspecific background bands. The assays currently available do not reliably measure levels of transgene-derived human progranulin in NHP tissues due to the high levels of nonspecific background. CSF levels are generally believed to reflect relevant brain concentrations, and they are of particular value as translational biomarkers to clinical studies.
Summary
There have been no adverse safety findings or toxicity concerns in any of the nonclinical studies, including a small pilot non-GLP study in NHPs and a GLP study in NHPs through Day 183, that preclude the initiation of a clinical study. The pathology findings in the GLP study were consistently minimal in severity with a low number of affected cells across both dose groups. There were no other in-life or post-mortem PR006A-related adverse findings.
Phase 1/2 Trial in Human Subjects with FTD-GRN
Human subjects (n=15) will be enrolled in an open-label trial of the PR006 recombinant AAV. The subject inclusion criteria comprise: 30-80 years old (inclusive), has a pathogenic GR mutation, is at a symptomatic disease stage, and has stable use of background medications prior to investigational product dosing. Each subject will receive the investigational product as a single ICM (intra-cisterna magna) injection. The trial will include a 3-month biomarker readout, a 12-month clinical readout and a 5-year safety and clinical follow-up. The trial will analyze: (1) safety and tolerability: (2) key biomarkers, including: progranulin, NfL (neurofilament light chain), and volumetric MRI (magnetic resonance imaging); and (3) Efficacy: CDR plus NACC FTLD (Clinical Dementia Rating plus National Alzheimer's Coordinating Center Frontal Temporal Lobar Dementia); measures of behavior, cognition, language, function, and QoL (quality of life).
The purpose of this experiment was to quantify the protein levels of progranulin (PGRN) in cerebrospinal fluid (CSF) using the ProteinSimple (San Jose, CA) Automated Western platform Jess. This test method may be used to analyze non-human primate (NHP) CSF samples. To determine the expression levels of human progranulin protein, the transgene product of PR006A, CSF samples from non-human primate subjects were analyzed on a Simple Western™ (Jess) platform using an antibody that specifically detects human progranulin protein. The Simple Western™ platform is a capillary-based automated Western blot immunoassay platform, where all steps, including protein separation, immunoprobing, washing, and detection by chemiluminescence occur in a capillary cartridge. Samples (at 4-fold dilution) and primary antibody to human progranulin (Adipogen PG-359-7, at 10-fold dilution), in addition to secondary antibodies and all buffers manufactured by ProteinSimple, were loaded onto a customized cartridge which was run on the Jess platform. Semi-quantitative data analysis occurred automatically after each run was completed, where parameters such as signal intensity, peak area, and signal-to-noise ratio were calculated using the Jess instrument. For each individual sample, the level of progranulin was measured as the peak area of immunoreactivity to the antibody. All analyses were performed with blinded samples.
The assay described here was performed on CSF samples from a non-human primate animal study. CSF samples were tested for presence and levels of progranulin protein to study efficacy of gene therapy using an rAAV construct (PR006; see
The following procedures were followed in performing this method:
Preparation of Stock Solutions:
Preparation of Samples:
Load Reagents and Samples into Cartridge:
Load Capillaries and Cartridge into Instrument:
The assay system suitability was considered acceptable if CV (coefficient of variance) percentage for duplicates was ≤30%.
Before the assay was used to detect progranulin in NHP CSF samples, the assay was tested as follows. Qualification of Jess assays included assessment of dilution linearity, selectivity and specificity. Normal CSF samples from BioIVT were used to determine dilution linearity of Jess assay. CSF samples from fronto-temporal dementia (FTD) patients with PGRN mutation (obtained from National Centralized Repository for Alzheimer's Disease and Related Dementias (NCRAD; Indianapolis, Indiana)) were used to determine selectivity and specificity of Jess assay.
Dilution linearity of PGRN protein detected by Jess was tested in CSF samples from commercially available (BioIVT) normal individuals. Endogenous levels of PGRN in CSF samples were measured to determine dilution linearity. Two individuals were tested in 2-fold serial dilution that ranges from 2 to 64 fold dilution.
Table 19 reported the peak area of PGRN protein at 58 kDa detected by Jess and the 00 differences of each dilution from 16-fold dilution. Results within the linearity range are in bold font (within 100±30% difference). Dilution linearity was established to be within 4 to 16 fold dilution.
−9.2
−23.2
−13.3
20.8
0.0
0.0
12.8
In summary, all of the tested matrices had an acceptable linear range that passed the acceptance criteria of a % difference that is 0±30%, though the size of the range and amount of dilution varied between matrices. Sample linearity MRD was established to be 4-fold dilution. Dilution linearity was established to be within 4- to 16-fold dilution. A summary of the MRD and linear dilution range that passes acceptance criteria for CSF is depicted in Table 20.
Selectivity and specificity of PGRN protein detected by Jess were tested in CSF samples from the PR006 FTD patient samples from NCRAD. Three groups (group A, B, and C) of CSF samples were collected form heterozygous FTD patients (group A), familial non-carrier (group B or C), and normal individuals (group B or C). Six samples were analyzed for each group. The groups of samples are listed in Table 16 FTD Patient CSF sample information.
CSF samples were 4-fold diluted in 0.1× sample buffer provided by ProteinSimple and tested in technical duplicates. Samples duplicates with result % CV more than 20% were re-analyzed. Results with % CV less than 20% were reported in Table 22. Table 22 reported the peak area of PGRN protein at 58 kDa detected by Jess and the % CV between duplicates. Results showed about two fold higher of PGRN levels in group B and C as compared to group A, which indicates the selectivity and specificity of Jess assay in determine PGRN levels for CSF samples (
CSF samples from FTD patient study (Table 21) were also analyzed with a human PGRN ELISA kit (Adipogen, AG-45A-0018YEK-KI01). Results from ELISA (
In conclusion, this ProteinSimple Automated Western Jess assay was determined to be suitable to use for the assessment of PGRN levels in NHP CSF samples.
Jess data for NHP CSF samples is shown in Table 23. Each sample represents the average across two technical replicates. The peak area for 58 kD band in the sample lane is reported. Data is presented as mean peak area of technical replicate and dilution folds adjusted.
The goal of this assay was to confirm the level of progranulin (PGRN) protein expression levels following the transduction of PR006 in tissue regions of interest for the NHP study. This was done using an automated Western platform, in which progranulin protein was detected using a monoclonal antibody. Progranulin expression was measurable in CSF in both control and PR006-treated NHP; the assay does not differentiate between endogenous progranulin protein and PR006A-induced progranulin protein.
PR006A is an investigational gene therapy that utilizes an AAV9 viral vector to deliver DNA encoding wildtype GRN, the gene encoding PGRN, to a patient's cells (see
Each enrolled patient must have symptomatic FTD as per health care provider assessment (bvFTD, PPA-FTD, FTD with corticobasal syndrome, or a combination of syndromes are allowed for enrollment). Each enrolled patient must score ≥1 and ≤15 on CDR plus NACC FTLD SB (Clinical Dementia Rating staging instrument plus National Alzheimer's Coordinating Center frontotemporal lobar degeneration domains). Each enrolled patient must be a carrier of a pathogenic GRN mutation. Pathogenic mutations include all null mutations including nonsense, frameshift, splice site mutations, and complete or partial (exonic) gene deletions:
Immunosuppressant Administration
Corticosteroid Administration: Patients will receive a loading dose of methylprednisolone (MPS) 1000 mg IV pulse on Day −1 (allowed at Day −1 or Day 0 depending on site set-up). See section below for possible 100 mg IV methylprednisolone administration between Day −14 to Day −2 prior to rituximab (RTX) administration. Prednisone at a dose of 30 mg/day will be given orally as concomitant medication from the day after 1000 mg IV methylprednisolone pulse (Day 0 or Day 1) for 14 days and will be then tapered over the ensuing 7 days. Higher doses or a longer taper of corticosteroids may be used at the health care provider's discretion.
Rituximab Administration: Patients will receive a 1-time dose of 1000 mg rituximab IV on any single day between Day −14 and Day −1. In order to mitigate the risk and severity of infusion-related reaction (IRR) associated with rituximab, patients will receive IV methylprednisolone before receiving IV rituximab. For rituximab dose administration on Day −1, patients will receive their rituximab infusion at least 30 minutes after the 1000 mg IV methylprednisolone pulse described above. For rituximab dose administration between Day −14 and Day −2, patients will receive a 100 mg methylprednisolone IV infusion approximately 30 minutes before receiving their IV rituximab.
Acetaminophen and/or diphenhydramine may be provided in addition for IRR prophylaxis per local practice and/or the health care provider's discretion.
Sirolimus Administration: Patients will receive a sirolimus oral loading dose of 6 mg at Day −1 (window of Day −3 to Day −1). A subsequent sirolimus oral maintenance dose of 2 mg/day will be provided as concomitant medication starting at Day 0 (or the day after the sirolimus loading dose, if the sirolimus loading dose is administered at Day −3 or Day −2) and adjusted as needed to maintain serum trough levels of 6 ng/mL (range 4-9 ng/mL) for 90 days. Sirolimus will then be tapered over the ensuing 15 to 30 days. Sirolimus trough levels will be collected prior to administration of the sirolimus dose for each visit. Higher doses or a longer taper of sirolimus may be used at the health care provider's discretion.
Immunosuppression Monitoring Criteria: In addition to monitoring sirolimus trough levels, each patient's clinical status, lab findings, and potential adverse events will be evaluated.
Consideration should also be given to the need to increase doses of the immunosuppressant agent, prolong the tapering regimen, add an additional agent, or reinitiate treatment based on clinical signs or symptoms consistent with an immune response, including:
The health care provider should consider implementing a longer prednisone taper over an additional 4 weeks in patients presenting with ALT and/or AST >3×ULN at the end of the initial 14-day taper. In case of AST/ALT elevations refractory to prednisone treatment, the health care provider should seek expert advice from a hepatologist. In case of CSF inflammatory changes requiring rescue immunosuppression, an unscheduled lumbar puncture should be performed between 1 and 2 months after immunosuppression reinitiation/dose increase/introduction of additional immunosuppression agent.
Pre-Cisternal Puncture Procedures
Patients will undergo standard of care medical evaluations in preparation for cisternal puncture, including anesthesiologist consultation. The proceduralist and anesthesiologist will review Screening clinical laboratory analyses (including documented negative pregnancy test), brain and cervical spine (if requested by the proceduralist) MRI and MRA, and local ECG results. Medical history and currently prescribed and over-the-counter medications will be reviewed with regards to any recent changes. At the anesthesiologist's discretion, additional clinical assessments may be performed (specific to concomitant medical conditions).
Intracisternal Injection
On Day 0, PR006A will be administered as a single dose via suboccipital injection into the cisterna magna by a proceduralist. Prior to injection, a volume of intracisternal fluid equivalent to the PR006A dosing volume will be removed. The procedure will be performed under general anesthesia or deep sedation and using imaging guidance. Patients will remain under observation for 24 hours (overnight inpatient stay) after PR006A administration.
Study Design
This is a 5-year study. During the first year, patients will be evaluated for the effect of PR006A on safety, tolerability, immunogenicity, biomarkers, and efficacy. Patients will follow up for an additional 4 years to continue to monitor safety, selected biomarkers, and efficacy parameters.
Efficacy Assessments
Primary objectives are to evaluate the safety, tolerability, and immunogenicity of three dose levels of PR006A administered via suboccipital injection into the cisterna magna and to quantify PGRN levels in blood and CSF.
Secondary objectives are to evaluate the effect of PR006A on: CDR plus NACC FTLD and NfL (neurofilament light chain), levels in blood and CSF.
Exploratory objectives are to evaluate the effect of PR006A on: Measures of cognition, behavior, language, and daily living; viral shedding; imaging patterns based on vMRI and quantification of white matter lesions; and selected biomarkers of neuroinflammation, astroglial pathology, and lysosomal function (e.g., glial fibrillary acidic protein (GFAP), YKL-40, Bis(monoacylglycero)phosphate (BMP)) in CSF, blood, and urine.
This Application incorporates by reference the contents of the following documents in their entirety: U.S. Application Publication No. 2020/0332265; International PCT Application Publication No. WO 2019/070893; International PCT Application Publication No. WO 2019/070891; U.S. Provisional Application Ser. No. 62/567,296, filed Oct. 3, 2017, entitled “GENE THERAPIES FOR LYSOSOMAL DISORDERS”; 62/567,311, filed Oct. 3, 2017, entitled “GENE THERAPIES FOR LYSOSOMAL DISORDERS”; 62/567,319, filed Oct. 3, 2017, entitled “GENE THERAPIES FOR LYSOSOMAL DISORDERS”; 62/567,301, filed Oct. 3, 2018, entitled “GENE THERAPIES FOR LYSOSOMAL DISORDERS”; 62/567,310, filed Oct. 3, 2017, entitled “GENE THERAPIES FOR LYSOSOMAL DISORDERS”; 62/567,303, filed Oct. 3, 2017, entitled “GENE THERAPIES FOR LYSOSOMAL DISORDERS”; and 62/567,305, filed Oct. 3, 2017, entitled “GENE THERAPIES FOR LYSOSOMAL DISORDERS”.
Having thus described several aspects of at least one embodiment of this invention, it is to be appreciated that various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be part of this disclosure, and are intended to be within the spirit and scope of the invention. Accordingly, the foregoing description and drawings are by way of example only.
While several embodiments of the present invention have been described and illustrated herein, those of ordinary skill in the art will readily envision a variety of other means and/or structures for performing the functions and/or obtaining the results and/or one or more of the advantages described herein, and each of such variations and/or modifications is deemed to be within the scope of the present invention. More generally, those skilled in the art will readily appreciate that all parameters, dimensions, materials, and configurations described herein are meant to be exemplary and that the actual parameters, dimensions, materials, and/or configurations will depend upon the specific application or applications for which the teachings of the present invention is/are used. Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific embodiments of the invention described herein. It is, therefore, to be understood that the foregoing embodiments are presented by way of example only and that, within the scope of the appended claims and equivalents thereto, the invention may be practiced otherwise than as specifically described and claimed. The present invention is directed to each individual feature, system, article, material, and/or method described herein. In addition, any combination of two or more such features, systems, articles, materials, and/or methods, if such features, systems, articles, materials, and/or methods are not mutually inconsistent, is included within the scope of the present invention.
The indefinite articles “a” and “an,” as used herein in the specification and in the claims, unless clearly indicated to the contrary, should be understood to mean “at least one.”
The phrase “and/or,” as used herein in the specification and in the claims, should be understood to mean “either or both” of the elements so conjoined, i.e., elements that are conjunctively present in some cases and disjunctively present in other cases. Other elements may optionally be present other than the elements specifically identified by the “and/or” clause, whether related or unrelated to those elements specifically identified unless clearly indicated to the contrary. Thus, as a non-limiting example, a reference to “A and/or B,” when used in conjunction with open-ended language such as “comprising” can refer, in one embodiment, to A without B (optionally including elements other than B); in another embodiment, to B without A (optionally including elements other than A); in yet another embodiment, to both A and B (optionally including other elements); etc.
As used herein in the specification and in the claims, “or” should be understood to have the same meaning as “and/or” as defined above. For example, when separating items in a list, “or” or “and/or” shall be interpreted as being inclusive, i.e., the inclusion of at least one, but also including more than one, of a number or list of elements, and, optionally, additional unlisted items. Only terms clearly indicated to the contrary, such as “only one of” or “exactly one of,” or, when used in the claims, “consisting of,” will refer to the inclusion of exactly one element of a number or list of elements. In general, the term “or” as used herein shall only be interpreted as indicating exclusive alternatives (i.e. “one or the other but not both”) when preceded by terms of exclusivity, such as “either,” “one of,” “only one of,” or “exactly one of.”
As used herein in the specification and in the claims, the phrase “at least one,” in reference to a list of one or more elements, should be understood to mean at least one element selected from any one or more of the elements in the list of elements, but not necessarily including at least one of each and every element specifically listed within the list of elements and not excluding any combinations of elements in the list of elements. This definition also allows that elements may optionally be present other than the elements specifically identified within the list of elements to which the phrase “at least one” refers, whether related or unrelated to those elements specifically identified. Thus, as a non-limiting example, “at least one of A and B” (or, equivalently, “at least one of A or B,” or, equivalently “at least one of A and/or B”) can refer, in one embodiment, to at least one, optionally including more than one, A, with no B present (and optionally including elements other than B); in another embodiment, to at least one, optionally including more than one, B, with no A present (and optionally including elements other than A); in yet another embodiment, to at least one, optionally including more than one, A, and at least one, optionally including more than one, B (and optionally including other elements); etc.
Use of ordinal terms such as “first,” “second,” “third,” etc., in the claims to modify a claim element does not by itself connote any priority, precedence, or order of one claim element over another or the temporal order in which acts of a method are performed, but are used merely as labels to distinguish one claim element having a certain name from another element having a same name (but for use of the ordinal term) to distinguish the claim elements.
It should also be understood that, unless clearly indicated to the contrary, in any methods claimed herein that include more than one step or act, the order of the steps or acts of the method is not necessarily limited to the order in which the steps or acts of the method are recited.
Each of the U.S. patents, U.S. patent application publications, U.S. patent applications, foreign patents, foreign patent applications and non-patent publications referred to in this application is incorporated herein by reference, in its entirety.
In some embodiments, an expression cassette encoding one or more gene products (e.g., a first, second and/or third gene product) comprises or consists of (or encodes a peptide having) a sequence set forth in any one of SEQ ID NOs: 1-91. In some embodiments, an expression cassette encoding one or more gene products comprises or consists of a sequence that is complementary (e.g., the complement of) a sequence set forth in any one of SEQ ID NOs: 1-91. In some embodiments, an expression cassette encoding one or more gene products comprises or consists of a sequence that is a reverse complement of a sequence set forth in any one of SEQ ID NOs: 1-91. In some embodiments, a gene product is encoded by a portion (e.g., fragment) of any one of SEQ ID NOs: 1-91. In some embodiments, a nucleic acid sequence is a nucleic acid sense strand (e.g., 5′ to 3′ strand), or in the context of a viral sequences a plus (+) strand. In some embodiments, a nucleic acid sequence is a nucleic acid antisense strand (e.g., 3′ to 5′ strand), or in the context of viral sequences a minus (−) strand.
Notwithstanding the appended claims, the disclosure sets forth the following numbered embodiments:
1. A method for treating a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising administering to the subject:
2. A method for suppressing an immune response in a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising administering to the subject:
3. The method of embodiment 1 or 2, wherein the rAAV is administered to the subject at a dose ranging from about 1×1013 vector genomes (vg) to about 7×1014 vg.
4. The method of embodiment 1 or 2, wherein the rAAV is administered to the subject at a dose of about 3.5×1013 vg, about 7.0×1013 vg or about 1.4×1014 vg.
5. The method of any one of embodiments 1-4, wherein the rAAV is administered via an injection into the cisterna magna.
6. The method of any one of embodiments 1-5, wherein the promoter is a chicken beta actin (CBA) promoter.
7. The method of any one of embodiments 1-6, wherein the rAAV vector further comprises a cytomegalovirus (CMV) enhancer.
8. The method of any one of embodiments 1-7, wherein the rAAV vector further comprises a Woodchuck Hepatitis Virus Posttranscriptional Regulatory Element (WPRE).
9. The method of any one of embodiments 1-8, wherein the rAAV vector further comprises a Bovine Growth Hormone polyA signal tail.
10. The method of any one of embodiments 1-9, wherein the nucleic acid comprises two adeno-associated virus inverted terminal repeats (ITR) sequences flanking the expression construct.
11. The method of embodiment 10, wherein each ITR sequence is an AAV2 ITR sequence.
12. The method of embodiment 10 or 11, wherein the rAAV vector further comprises a TRY region between the 5′ ITR and the expression construct, wherein the TRY region comprises SEQ ID NO: 28.
13. A method for treating a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising administering to the subject:
14. A method for suppressing an immune response in a subject having or suspected of having fronto-temporal dementia with a GRN mutation, the method comprising administering to the subject:
15. The method of embodiment 13 or 14, wherein the rAAV is administered to the subject at a dose ranging from about 1×1013 vg to about 7×1014 vg.
16. The method of embodiment 13 or 14, wherein the rAAV is administered to the subject at a dose of about 3.5×1013 vg, about 7.0×1013 vg or about 1.4×1014 vg.
17. The method of any one of embodiments 13-16, wherein the rAAV is administered via an injection into the cisterna magna.
18. The method of any one of embodiments 1-17, wherein the rAAV is administered in a formulation comprising about 20 mM Tris, pH 8.0, about 1 mM MgCl2, about 200 mM NaCl, and about 0.001% w/v poloxamer 188.
19. The method of any one of embodiments 1-18, wherein the methylprednisolone is administered intravenously at a dose of about 1000 mg either one day before or on the same day as administration of the rAAV.
20. The method of any one of embodiments 1-19, wherein the prednisone is administered orally
21. The method of any one of embodiments 1-20, wherein the rituximab is administered intravenously at a dose of about 1000 mg on any single day between 14 days before and 1 day before administration of the rAAV.
22. The method of embodiment 21, wherein the methylprednisolone is administered before the rituximab is administered.
23. The method of embodiment 22, wherein the methylprednisolone is administered at least about 30 minutes before the rituximab is administered.
24. The method of embodiment 21, wherein the methylprednisolone and the rituximab are both administered the day before administration of the rAAV; and wherein the methylprednisolone is administered at least about 30 minutes before the rituximab is administered.
25. The method of embodiment 21, wherein the rituximab is administered on any single day between 14 days before and 2 days before administration of the rAAV; and wherein the methylprednisolone is administered intravenously at a dose of about 100 mg at least about 30 minutes before the rituximab is administered on the same day as the rituximab is administered.
26. The method of any one of embodiments 1-25, wherein the sirolimus is administered orally
27. The method of embodiment 26, wherein the sirolimus administration is tapered during the 15 days to 30 days following the end of the 90-day period after administration of the rAAV.
28. The method of any one of embodiments 1-27, the method comprising:
29. The method of any one of embodiments 1-27, the method comprising:
30. The method of embodiment 2 or 14, wherein the immune response is an immune response to the rAAV.
31. The method of any one of embodiments 2, 14 and 30, wherein the immune response is a T cell response.
32. The method of any one of embodiments 2, 14 and 30, wherein the immune response is a B cell response.
33. The method of any one of embodiments 2, 14 and 30, wherein the immune response is an antibody response.
34. The method of any one of embodiments 2, 14 and 30, wherein the immune response is pleocytosis.
35. The method of embodiment 34, wherein the pleocytosis is cerebrospinal fluid (CSF) pleocytosis.
36. The method of any one of embodiments 2, 14 and 30, wherein the immune response is an abnormal level of CSF protein.
37. The method of any one of embodiments 1-36, wherein an additional immunosuppressant that is not sirolimus, methylprednisolone, rituximab or prednisone is further administered to the subject.
38. A therapeutic combination of
39. A therapeutic combination of
40. The therapeutic combination for use of embodiment 39, wherein the combination comprises from about 1×1013 vg to about 7×1014 vg of the rAAV.
41. The therapeutic combination for use of embodiment 39, wherein the combination comprises about 3.5×1013 vg, about 7.0×1013 vg or about 1.4×1014 vg of the rAAV.
This application claims the benefit of U.S. Provisional Patent Application No. 63/063,852, filed on Aug. 10, 2020, the disclosure of which is hereby incorporated by reference in its entirety.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2021/045443 | 8/10/2021 | WO |
| Number | Date | Country | |
|---|---|---|---|
| 63063852 | Aug 2020 | US |
