Chimeric promoter for cone photoreceptor targeted gene therapy
The subject invention concerns materials and methods for providing for cone cell specific expression of a polynucleotide in a human or animal. One aspect of the invention concerns a polynucleotide promoter sequence that directs expression of an operably linked polynucleotide in cone cells. In one embodiment, a polynucleotide of the invention comprises a nucleotide sequence of an interphotoreceptor retinoid-binding protein (IRBP) gene that is positioned upstream of a promoter nucleotide sequence of a cone transducin alpha-subunit (GNAT2) gene. Another aspect of the subject invention concerns methods for expressing a selected polynucleotide in cone cells. The selected polynucleotide can be provided in a polynucleotide of the invention wherein the selected polynucleotide is operably linked to a polynucleotide promoter sequence of the invention. In one embodiment, the selected polynucleotide sequence is provided in a polynucleotide vector of the invention. The vector comprising the selected polynucleotide is then introduced into a cell. The selected polynucleotide is expressed only in cone cells, with very little, if any, expression in rods or other cells. A selected polynucleotide can be one that encodes, for example, a therapeutic protein or a functional protein that is defective or underexpressed in the targeted cone cells.
1. A polynucleotide that promotes expression in cone cells of an operably linked nucleotide sequence, wherein said polynucleotide comprises an enhancer nucleotide sequence of an interphotoreceptor retinoid-binding protein (IRBP) gene sequence that is positioned upstream of a promoter nucleotide sequence of a cone transducing alpha-subunit (GNAT2) gene sequence, wherein said polynucleotide sequence comprises the nucleotide sequence shown in SEQ. ID NO:1 or SEQ. ID NO:4.
2. The polynucleotide according to claim 1 , wherein said polynucleotide further comprises a nucleotide sequence encoding a therapeutic protein or a functional protein or a reporter protein.
3. The polynucleotide according to claim 2 , wherein said polypeptide is a cyclic nucleotide-gated (CNG) channel polypeptide.
4. The polynucleotide according claim 3 , wherein said CNG polypeptide is a CNGA3 or a CNGB3 polypeptide.
5. The polynucleotide according to claim 4 , wherein said CNG3B polypeptide comprises the amino acid sequence of SEQ ID NO:5.