Recombinant AAV vectors for treating neurodegenerative disorders
Provided is a recombinant adeno-associated viral (rAAV) vector comprising one or two of (a) to (c): (a) a nucleotide sequence encoding aromatic L-amino acid decarboxylase (AADC), (b) a nucleotide sequence encoding glucocerebrosidase (GBA1); and (c) a nucleotide sequence encoding a neurotrophic factor (NTF), such as cerebral dopamine neurotrophic factor (CDNF) or glial cell derived neurotrophic factor (GDNF), for treating neurodegenerative disorders, particularly Parkinson's disease (PD), Multiple system atrophy (MSA), Gaucher's disease (GD), and other proteinopathies. Also provided herein are viral particles comprising the rAAV vector, a pharmaceutical composition comprising the viral particles, and uses thereof.
1 . An isolated nucleic acid molecule, comprising a first nucleotide sequence encoding a first protein operatively linked to a second nucleotide sequence encoding a second protein, wherein the first protein and the second protein are selected from the following combination (a) or (b):
(a) the first protein is human aromatic L-amino acid decarboxylase (AADC), and the second protein is human glial cell derived neurotrophic factor (GDNF); or
(b) the first protein is human GDNF, and the second protein is human AADC,
wherein the first nucleotide sequence is located upstream of the second nucleotide sequence;
wherein the human AADC is encoded by the nucleotide sequence comprising or consisting of any one of SEQ ID NOs: 3, 5, 6, 8, 9 or 46.
2 . The isolated nucleic acid molecule of claim 1 , wherein:
the polypeptide sequence of AADC comprises or is the amino acid sequence as shown in SEQ ID NO: 31; and/or
the polypeptide sequence of GDNF comprises or is the amino acid sequence as shown in SEQ ID NO: 34.
3 . The isolated nucleic acid molecule of claim 1 , wherein the first protein is human AADC.
4 . The isolated nucleic acid molecule of claim 1 , when the second protein is human GDNF, wherein the second nucleotide sequence comprises or is a nucleotide sequence selected from a group consisting of the nucleotide sequence as shown in any one of SEQ ID NOs: 27-30.
5 . The isolated nucleic acid molecule of claim 1 , wherein the nucleotide sequence encoding human GDNF is a codon-optimized coding sequence of GDNF, and the codon-optimized coding sequence differs from the wild-type coding sequence of GDNF as shown in SEQ ID NO: 30 in nucleotides not present in the region coding for the signal peptide or pre-peptide of GDNF.
6 . The isolated nucleic acid molecule of claim 5 , wherein the nucleotide sequence encoding human GDNF is a codon-optimized coding sequence of GDNF and has reduced CpG sites or has no CpG islands as compared to the wild-type coding sequence of GDNF as shown in SEQ ID NO: 30.
7 . The isolated nucleic acid molecule of claim 1 , wherein the first nucleotide sequence and the second nucleotide sequence are linked in frame and are operatively linked to a promoter located at the 5′ upstream to both the first and the second nucleotide sequences.
8 . The isolated nucleic acid molecule of claim 7 , wherein the promoter is selected from a CBh promoter, an EFla promoter, a CAG promoter, a MBP promoter or a variant thereof.
9 . The isolated nucleic acid molecule of claim 8 , wherein the promoter is a truncated variant of EFla promoter having the nucleotide sequence of any one of SEQ ID NOs: 50-56.
10 . A codon-optimized sequence of AADC, having a nucleotide as shown in any one of SEQ ID NOs: 3, 5, 6, 8, 9 or 46.
11 . A recombinant adeno-associated viral (rAAV) vector, comprising the isolated nucleic acid molecule of claim 1 .
12 . A viral particle comprising the rAAV vector of claim 11 .
13 . The viral particle of claim 12 , which comprises a capsid protein of AAV1, AAV2, AAV5, AAV8 or AAV9.
14 . A pharmaceutical composition, comprising the viral particle of claim 12 , and a pharmaceutically acceptable excipient.