Gene therapies for lysosomal disorders
The disclosure relates, in some aspects, to compositions and methods for treatment of diseases associated with aberrant lysosomal function, for example Parkinson's disease (PD) and Gaucher disease. In some embodiments, the disclosure provides expression constructs comprising a transgene encoding beta-Glucocerebrosidase (GBA) or a portion thereof alone or in combination with one or more PD-associated genes. In some embodiments, the disclosure provides methods of Parkinson's disease by administering such expression constructs to a subject in need thereof.
1. An isolated nucleic acid comprising
(i) an expression construct comprising a transgene encoding a prosaposin (PSAP) protein, wherein the PSAP protein is encoded by the nucleic acid sequence in SEQ ID NO: 17; and
(ii) two adeno-associated virus (AAV) inverted terminal repeat (ITR) sequences flanking the expression construct.
2. The isolated nucleic acid of claim 1 , wherein the transgene is operably linked to a promoter.
3. The isolated nucleic acid of claim 2 , wherein the promoter comprises a chicken beta-actin (CBA) promoter.
4. The isolated nucleic acid of claim 1 , wherein the ITRs are AAV2 ITRs.
5. A Baculovirus vector comprising the isolated nucleic acid of claim 1 .
6. A cell comprising:
(i) a first vector encoding one or more adeno-associated virus (AAV) rep protein and/or one or more AAV virus cap protein; and
(ii) a second vector comprising the isolated nucleic acid of claim 1 .
7. The cell of claim 6 , wherein the first vector is a plasmid and the second vector is a plasmid.
8. The cell of claim 6 , wherein the first vector is a Baculovirus vector and the second vector is a Baculovirus vector.
9. A recombinant adeno-associated virus (rAAV) vector comprising a nucleic acid comprising an expression construct comprising a transgene encoding a prosaposin (PSAP) protein flanked by two adeno-associated virus (AAV) inverted terminal repeats (ITRs), wherein the PSAP protein is encoded by the nucleic acid sequence in SEQ ID NO: 17.
10. The rAAV vector of claim 9 , wherein the transgene is operably linked to a promoter.
11. The rAAV vector of claim 10 , wherein the promoter comprises a chicken beta-actin (CBA) promoter.
12. The rAAV vector of claim 9 , wherein each ITR sequence is a wild-type AAV2 ITR sequence.
13. A plasmid comprising the rAAV vector of claim 9 .
14. A recombinant adeno-associated virus (rAAV) comprising:
(i) an adeno-associated virus (AAV) capsid protein; and
(ii) the rAAV vector of claim 9 .
15. The rAAV of claim 14 , wherein the AAV capsid protein is AAV9 capsid protein.
16. A recombinant adeno-associated virus (AAV) vector comprising a nucleic acid comprising, in 5′ to 3′ order:
(a) a 5′ adeno-associated virus (AAV) inverted terminal repeat (ITR);
(b) a CMV enhancer;
(c) a chicken beta actin (CBA) promoter;
(d) a transgene encoding a prosaposin (PSAP) protein, wherein the PSAP protein is encoded by the nucleic acid sequence in SEQ ID NO: 17;
(e) a Woodchuck hepatitis virus Posttranscriptional Regulatory Element (WPRE);
(f) a Bovine Growth Hormone polyA (bGH polyA) signal tail; and
(g) a 3′ AAV ITR.
17. A recombinant adeno-associated virus (rAAV) comprising:
(i) an adeno-associated virus (AAV) capsid protein; and
(ii) the rAAV vector of claim 16 .
18. The rAAV of claim 17 , wherein the AAV capsid protein is AAV9 capsid protein.
19. A method of producing an rAAV, the method comprising:
(i) delivering to a cell a first vector encoding one or more adeno-associated virus (AAV) rep protein and/or one or more AAV cap protein, and the recombinant AAV (rAAV) vector of claim 16 ;
(ii) culturing the cells under conditions allowing for packaging the rAAV; and
(iii) harvesting the cultured host cell or culture medium for collection of the rAAV.